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FT-920

1. FREQ DATA Ms 2 LSE MSE L5H M 4 LSE MSs 7 5 Lt Wes 4sl2 1 10 7S 40s 21 ce PSs FEBEBENTIS ae z raat x ra ak 0 J 0 a 2 7 1 c nnt nME l i g 5 fi 7 r Q c 56 300 otMkz CLAR DATA MSD 6 LSD MER 7 L50 saen Felsen ee a 2 7 Li I agagkliz t 3 a F 1 S 994kHzZ MODE DATA MSL 8 LSU 6 5 4 3 214 Nat Usce Not Usec 0 REPS OCG SSR C1 GW MC AN 011 FM 00 CaTa LSB 101 Dela LS6 TO Jala FM Not Usen SIDE BAND 0 LOWER 1 UPPER BANC WIDTH WICE 1 NARROW kn Net Usec Nal Uae Nal Usce Nat Usec Not Usec CAT FV NARROW Dala USE NALD MATAI SA NARROW TX CLAR 0 OFF ON RX CLA C OFF 1 2N NENI BX ANTENNA J GFF 1 ON Nat Usce Not Usec FILTER BATA 1 Ma tA fF Tlel bis New Used Nip Use FN NARROW aM NARROW CW UPPER SIDE CW NARROW S58 JPPTR RINT 536 NARROW MR FLAG ma tE ie lels ph 8 le TX on VFZ E X on VFB arterna une CoN Not see Nut Jsi Not Jsad Not Jead Nat User FT 920 Operating Manual The FT 920 s memory data is maintained even when DC power it turned off via a lithium backup battery with an estimated lifetime of approximately five years No data essential to the fundamental operation of the radio is stored
2. Available Values off C400 ms Default fi off U 08 DIMMER Function Adjustment of illumination level for front panel display Available Values 91 1 Default af F In low light situations activating the Dimmer may re duce excess brightness in the display For normal room lighting however this Menu Item should be set to Off for best visibility FT 920 Operating Manual 73 U 09 TTSPLAY Function Selection of display Multi Panel charac teristics Available Values LL A 7F En oF FEE Default 1 AC This Menu Item allows you to choose which selec tion will be displayed in the small Multi Panel located immediately to the right of the VFO A frequency dis LAC Display of the Clarifier offset in kHz from the VFO A frequency h Display of the CW Pitch in Hz grrace Display of the amount of frequency dif ference between VFO A and VFO B U 10 E IISPL Function Selection of Enhanced Tuning Scale choices Available Values i A 7HOP t inE Fi n Default 457 The Enhanced Tuning Scale located immediately above the VFO A frequency display may be used to provide a visual indication of several transceiver op erating characteristics L When the Clarifier is active a small dot below the horizontal Enhanced Tuning Scale shows the relative offset of the Clarifier from the displayed VFO A fre quency Note that this small dot will be observed on Receive when the Rx Clarifier is on but only on t
3. Bandwidth Selection Optional filters are available from your Yaesu dealer for providing selectable IF bandwidths in the CW and AM modes For CW the optional YF 116C 500 Hz filter provides the narrow selectivity needed for today s crowded bands while on AM the YF 116A filter pro vides a 6 kHz bandwidth for improved listening fidel ity Pressing the Narrow key on the front panel causes the narrower filter appropriate for that operating mode to be switched into the circuit See the chart below for the bandwidths available in each mode NARROW Switch RX AM TX FM Through a WIDE FM 4 2 5 kHz OFF NA RROW FM 7 O CW Narrow and AM 6 kHz bandwidth opera tion requires installation of an optional filter O In the AM mode when the optional AM filter is installed the default bandwidth will be 6 kHz pressing the Narrow key engages the SSB 2 4 kHz filter O In the FM mode the action of the Narrow switch affects only the transmitter For 29 MHz NBFM work be sure to press the Narrow switch so as to set a maximum deviation of 2 5 kHz the statu tory deviation limit on the 10 meter band For 50 MHz however you will probably want to use the Wide configuration which provides 5 kHz de viation Amateur Band Selection VFO A Band Selection One touch Amateur band selection is provided via the Keypad located between the VFO A and VFO B Tuning Knobs Press th
4. The amount of offset from the VFO frequency will be displayed in the Multi Function Window of the dis play and a graphical representation of the magni tude and direction of the offset can be provided in the Enhanced Tuning Scale with proper setup of Menu Item U 10 see page 74 To turn the Clarifier off push the RX CLar and or TX Ciar again The transceiver will revert to the original VFO frequency however the offset will not be wiped clean but rather maintained at the current value on the assumption that you may want to hop back to the offset frequency again To set the Clarifier offset to Zero press the CLar CLear key CW Center Tuning Enhanced Tuning Scale The Enhanced Tuning Scale may be used to provide a visual indication of precise frequency adjustment in the CW mode Configuration of the Enhanced Tun ing Scale is performed via Menu Item U 10 page 74 When CW Center Tuning has been selected the CW passband center frequency as determined by the setting of the Pitcu control becomes the center point of the Enhanced Tuning Scale Per the illustration below when proper alignment of the incoming signal s pitch is accomplished your transmitter signal will pre cisely aligned in a zero beat with the frequency of the incoming signal CW Spot The CW Spot feature provides an audible method of aligning your FT 920 s transmitter to the frequency of an incoming signal as opposed to the visual method
5. Meter Byte Meter Byte P1 00 S PO ALC VOLT AMP P1 01 FWD REV SHIFT PITCH P1 02 Dummy byte SQL HPF LPF P1 03 NR PROC DISC RMC CTCSS Tone Data BEE ANA Hz Hz Hz Hz p ET o i 7 8h R 3h TE E E ree a A E a FT 920 Operating Manual 88 CAT Data Protocol Serial data is passed via the H T jack on the rear panel of the transceiver at 4800 bps When data is being transferred the AT indicator on the front panel display is illuminated momentarily disappear ing when the data flow is terminated All commands sent from the computer to the transceiver consist of five byte blocs with up to 200 ms between each byte The last byte in each block is the instruction opcode while the first four bytes of each block are arguments either parameters for that instruction or dummy val ues required to pad the block out to five bytes see CAT 5 BYTE COMMAND STRUCTIURE Each byte sent consists of one start bit 8 data bits no parity bit and two stop bits Start Stop Stop stots fetel s e 7 sels CAT DATA BYTE FORMAT There are nineteen instruction opcodes for the FT 920 listed in the chart on page 86 Most of these duplicate front panel operations while some replicate Menu functions Note that most commands require one or more parameters to be set however regard less of the number of parameters present every Command Block sent must consist of five bytes
6. This icon is illuminated when frequency data is pro vided by the VFO system 22 Mem This icon is illuminated when frequency data is re called from the Memory system 23 Mem Tune This icon is illuminated when transceiver frequency control is in a pseudo VFO mode known as Memory Tune whereby a memory channel is used as a start ing point for tuning using the VFO A Tuning Dial FT 920 Operating Manual 29 30 31 25 24 32 33 37 38 39 Oluni CDon exant Ci ETH oss OOO OO Conan saa a ar oe AG on j 18 a CL cos a aao 00 00 0 005 CVF er OFFSET Ei KEYER J se ian 27 28 34 36 41 42 43 44 45 29 35 24 Ant A B RX Ant These icons indicate which antenna is currently in use 25 TX C ar RX These icons indicate the operating status of the Clari fier function When the Receive Clarifier is on CLar RX will be displayed when the Transmit Clarifier is on TX Car will be displayed 26 Multi Panel This panel of the display area provides quantitative data regarding transceiver operating status At the factory this panel is set up to display the amount of Clarifier system frequency offset from the main VFO frequency Other available functions include dis play of CW Pitch and VFO A VFO B Offset utilizing Menu Item U 09 See page 74 for details 27 RPT These icons are illuminated during Repeater FM operation
7. keys or via the VFO B Tun ing Dial as with regular memories When operating on a Catt Channel it is possible to utilize the Memory Tune mode in a manner simi lar to that used on regular memories Just ro tate the VFO A Tuning Dial as desired to tune off of the pre programmed Catt Channel fre quency The new frequency may be stored in an other memory if desired as described on page 60 To cancel Memory Tune operation press the VFO Men key once or press and hold in Step and press another Banp key for another Catt Channel Adding Alpha Numeric Labels to Memory Channels Each of the memory channels in the FT 920 except FT 920 Operating Manual 64 for the QMB channels may be appended with a seven digit Alpha Numeric Label which may aid in memory channel recognition Such Labels can be particularly useful for identifying Shortwave Broad cast stations stored in memory especially because identification can be difficult if they are broadcasting in a foreign language you do not understand Alpha Numeric Label programming is simple to accomplish using the front panel knobs and or the keys First recall the memory channel to which the La bel is to be appended Press the Disptay key located immediately to the right of the VFO A TX LED Switch any pre viously stored Label will be displayed in place of the VFO B frequency display Now press the Ent key on the keypad The fir
8. DADI kHz Dafault H L Changing this value is analogous to rotating the IF SHiFT control allowing you to preset the frequency response of the receiver during USB operation The effect of the adjustment can be heard if you turn the volume up while rotating the VFO B Tuning Dial to adjust the setting U 62 TUS ICAR Function Set the Tx Carrier Point for USB a Ta Available Values 400 g 508 kHz Dafault DOLL This is the same function as that of Menu Item U 58 as applied to your voice response on USB Tx The effect may be difficult to discern however depend ing on the settings of the TX Equalizer via Menu Item U 51 U 63 PROCUS SE Function Set the Tx Carrier Point for USB when the Speech Processor is on Available Values 113 Dafault DAND This is the same function as that of Menu Item U 59 but is applied to your voice response on USB Tx when the Speech Processor is on Therefore it is possible to set two different response characteristics for your voice one for Processor On and one for Processor Off a TI TI 2 ae ws Ti TI x I N U 64 K Ok ILY Function Set the hang time for the VOX circuitry Available Values i i Default Corresponding to 1 second The above scale of 1 15 is in 0 2 second incre ments allowing precise setting of the desired VOX recovery time U 65 ik GAIN Function Set the gain of the VOX circuitry s input audio detector Ava
9. Press this switch again to turn the speech processor off 22 Moni Gain Control This control is used to adjust the audio level of the voice monitor Clockwise rotation increases the au dio level 23 Moni Switch Pressing this switch activates the voice monitor which allows the operator to monitor voice characteristics during adjustments When the monitor is activated the Mont indicator appears on the display panel Press this switch again to turn off the monitor FT 920 Operating Manual 24 NB LeveL Control This control adjusts the blanking level for the IF Noise Blanker Clockwise rotation increases the degree of blanking 25 NB Switch Pressing this switch activates the IF Noise Blanker When the Noise Blanker is activated the NB indi cator will appear in the display panel Press this switch again to switch the Noise Blanker off The IF Noise Blanker may be used or alone or in conjunction with the DSP Noise Reduction fea ture 26 RX VFO A Indicator Switch This combination LED Switch indicates the operat ing status of VFO A in the receive mode The LED appears green when the receiver is set up for the use of VFO A This LED is also a switch when the receiver is using VFO A pressing the green LED will cause the re ceiver to be muted the LED will now blink Press the LED again to cancel the mute function 27 TX VFO A Indicator Switch This combination LED Switch indicates w
10. U 21 and U 22 see pages 75 and 76 Default 1 1 3 Dot Space Dash Space 1 mae a ba Dash 3 Dot 1 1 5 1 3 Dot Space Dash ss E i bu a Dash 3 Dat 1 5 1 1 4 5 Dot Space Dash Gash 4 5 Q sg 1 a am be e Dot 1 A programmable delay in the keyer transmission may be added when using an amplifier so as to allow the amplifier s relays a few extra millisec onds in order to become properly seated This delay shifts the entire stream of dots and dashes without changing the weight Use Menu Item U 23 see page 76 The function of the electronic keyer may be changed from Keyer Without Space to Keyer With Auto Space to Bug Keying via Menu Item U 20 see page 75 Memory Keyer Operation The FT 920 includes an easy to use CW Message memory system which allows automated CW send ing of repetitive messages such as CQ TEST or CQ DX etc The following functions are available through the CW Message Memory system O Up to six messages may be stored four may contain up to 50 characters while the other two may contain up to 20 characters O A sequential contest number 001 002 may be imbedded in a message if desired O The stored messages may be reviewed with out transmission so the contents may be checked for accuracy O The message s may be transmitted so as to reduce operator fatigue during long operating sessions such as i
11. consult amateur radio refer ence guides and publications relating to RFI suppres sion techniques FT 920 Operating Manual 1 Linear Amplifier Interfacing The FT 920 can be used with the optional Yaesu FL 7000 Linear Amplifier which provides automatic band switching through the use of digital data sent via the Bano jack on the rear panel of the transceiver Most other commonly used linear amplifiers may also be used with the FT 920 so long as the Tx Rx switch ing voltages and timing Sequencing for the amplifier s control relay s are not extraordinary Tx Rx Control Devices for Linear Amplifier Switching Two control devices are provided in the FT 920 for Tx Rx control of an linear amplifier s relay s An open collector transistor switch provides a solid state fast acting closure to ground for low voltage low current situations maximum ratings are 50 V DC at 500 mA maximum dissipation of 25W and relays using negative DC voltages or AC of any kind must not be used with the transistor switch 3 The transistor switch s hot lead is identified as Tx Gnp since it closes to Gno on Tx and is provided on Pin 2 of the Bann DIN con nector on the rear panel of the FT 920 It is also provided via the rear panel Tx Gnp jack when the Tr Ry switch is set to the Tr posi tion A mechanical relay is provided for high volt age high current applications although the relay will not be fast eno
12. doubling with the other station During all phone patch operation you should moni tor both sides of the conversation at all times this may be required by law this will of course require a telephone at the operating position TELEPHONE LINE m a ge Sad r N OOOO OOOO OOOO DC 13 5V INPUT FT 920 Operating Manual 85 86 The CAT System in the FT 920 provides control of frequency VFO memory and other settings through the use of command codes sent from an external personal computer This allows multiple control op erations to be fully automated as a single mouse click or it allows a third party software package such as contest logging software to communicate with the FT 920 without operator intervention The FT 920 has a built in level converter allowing direct connection from the rear panel CAT jack to the serial port of your computer without the need for an external RS 232C level converter box You will need a serial cable for connection to the RS 232C COM port of your computer Purchase or con struct a standard serial cable not the so called null modem type ensuring it has the correct gender and number of pins for connection to your system Yaesu Musen does not produce CAT System oper ating software due to the wide variety of personal computers operating systems and applica
13. downlink signal through the satellite Because the break in system allows you to listen be tween dots the propagation delay through the satellite should allow you to hear traces of your signal and you may adjust the appropriate VFO for the exact pitch desired a well as to follow Doppler shift Make a note of the TX RX frequency differ FT 920 Operating Manual ence by pressing the Dsp y key You may use this display option to use the current offset as a starting point for setting the VFO A VFO B relationship when tuning around the satellite transponder downlink segment Remember though that Doppler shift will change during an operating session so the initial offset will not be maintained indefinitely The function of the DspLy key must be set to OFFseET via Menu Item U 09 for this function to work See page 74 For SSB operation be certain that each VFO is set to the correct sideband Initially during a pass it may be easier to establish the Uplink Downlink frequency offset on CW then switch both VFOs back to SSB amp When operating on Mode K take particular care to check your uplink frequency before transmit ting as your signal may be propagated over a long distance on the 21 MHz band possibly causing harmful interference to other operators Digital Mode Operation The FT 920 provides outstanding capabilities for digi tal mode operation such as RTTY packet etc It is important that you
14. nel press and hold in the V gt M key for 1 2 sec ond to lock the split frequency data into the cho sen memory location As usual a double beep will indicate when you have held in the V gt M key long enough Split Frequency Memory Channel Recall While operating in the VFO mode press the VFO Men key once to enter the Memory mode The Men indicator will appear on the display replac ing the VFO indicator It does not matter whether or not you are operating in the Split mode at this time Next press either the UPA or Down key to select the desired channel from within the d 01 d 10 Split Memory bank The differing transmit and receive frequencies will be indicated on the left and right sides of the frequency display and the VFO A and VFO B Tx and Rx LED Switches will be illuminated according to the relationship you programmed Particularly during 7 MHz pile up situations it may be necessary to adjust your transmit frequency which usually will be stored in VFO B The Memory Tune function is active with respect to either the VFO A or VFO B Tuning Dial so you may adjust either dial freely as desired if you need to retune The M Tune indicator will appear and you may as described earlier store the retuned frequency into another memory if desired Alter natively press the VFO Men key once to return to the original split frequency pair and press it once more to exit th
15. preceding the hyphen in the memory channel num ber will be available for recall via step above To change memory groups press the Mem Group key again so that the Group icon disappears then use the UPA or Down key to step through the channels until you enter another group You may now press the Group key again to re strict memory channel access to the newly se lected group Once you are operating on a memory channel you may tune off of the original frequency as though you were in the VFO mode Just rotate the Main Tuning Dial the Mem icon will be re placed by one which indicates Mem Tune indi cating that you have now shifted into the Memory Tune mode When operating in the Memory Tune mode if you find another frequency you wish to store into an other memory channel just press the V gt M key momentarily the channel number will blink se lect a new memory channel via the UPA or Down key then press and hold in the V gt M key for 1 2 second until you hear the double beep To exit the Memory Tune mode press the VFO Men key as follows O One touch of VFO Men returns you to the original memory frequency The Mem Tune indicator will be replaced by Mem O A second touch of VFO Men will cause you to exit the Memory mode and return to the VFO mode the Mem indicator will be replaced by VFO Note that repeater offsets used on 29 MHz and 5
16. 2 second then rotate the VFO B Tuning Dial You will see that you now have access to all Menu Items Press Meny to exit We will now provide a summary chart showing the Menu Items available followed by a more compre hensive description of each Menu Item and the choices available Menu Mode Summary Chart FT 920 Operating Manual Menu Mode Selections and Settings Function of Menu Item Available Choices VFO Dial Speed X2 X4 Up Down Switch Steps 0 5 kHz 1000 kHz Step 100 kHz Step Switch Function Tog gle Momentary Toggle Quick Split Offset TX When Spot is Pressed Off 100 kHz 100 kHz On O ff Off 220 Hz 7040 Hz O O ff 2000 ms On O ff Beep Frequency Peak Hold Metering Display Dimmer Control Clarifier Pitch Offs et Clarifier DSP Multi Panel Display Item Enhanced Tuning Scale Clar DS P Tuning Fine Tuning Memory Channel Group 1 1 99 Memory Channel Group 2 Last in Grp 1 1 99 Memory Channel Group 3 Last in Grp 2 1 99 Memory Channel Group 4 Last in Grp 3 1 99 Scanning Mode Carrier Drop Delay Halt Carrier Drop Cc Hold Time for Delay Scan 1 60 Seconds 5 Seconds Resume Time after Carrier Drop 0 10 Seconds 1 Second Dual Watch Polling Interval 3 15 Seconds 10 Seconds Scanning Speed 1 100 ms Step 10 ms Electronic Keyer Mode Keyer 1 Keyer 2 Bug Keyer 1 k k k k k k k A Keyer Dot Space Ratio 0 0 1 127 12 7 1 10 1 1 Keyer Dash Spac
17. 9 X x x i Y Notes to Opcode Command Chart Note 1 01 7A Memory Channel Number Hex 01 63 Memory Channels 1 01 1 99 64 6D Memory Channels d 01 d 10 6E 78 Memory Channels C 01 C 11 79 7A Memory Channels P Lo P Hi Note 2 01 7A Memory Channel Number Hex 01 63 Memory Channels 1 01 1 99 64 6D Memory Channels d 01 d 10 6E 78 Memory Channels C 01 C 11 79 7A Memory Channels P Lo P Hi P2 00 Memory Store P2 01 Memory Clear P2 02 Memory Recall Note 3 01 7A Memory Channel Number Hex 01 63 Memory Channels 1 01 1 99 64 6D Memory Channels d 01 d 10 6E 78 Memory Channels C 01 C 11 79 7A Memory Channels P Lo P Hi Note 4 P1 00 RX Clarifier Off P1 01 RX Clarifier On P1 80 TX Clarifier Off P1 81 TX Clarifier On P1 FF Set Clarifier P2 00 Clarifier Offset P2 FF Clarifier Offset P3 00 09 kHz P4 00 00 100 10 Hz Note 5 The frequency is converted to its BCD coded components For example to convert 14 256 78 MHz P1 P2 P3 P4 t ee 5 Byte Block 0A 01 42 56 78 1 Opcode Note 6 VFO A Mode Parameters VFO B Mode Parameters P1 00 LSB P1 80 LSB P1 01 USB P1 81 USB P1 02 CW USB P1 82 CW USB P1 03 CW LSB P1 83 CW LSB P1 04 AM P1 84 AM P1 05 AM P1 85 AM P1 06 FM P1 86 FM P1 07 FM N P1 87 FM N P1 08 DATA LSB P1 88 DATA LSB P1 09 DATA LSB P1 89 DATA LSB P1 0A DATA USB P1 8A DATA USB P1 0
18. 920 Operating Manual 1 Power Connections Be certain to follow the guidelines on page 6 care fully so as to ensure that your AC power supply is configured for the AC line voltage used in your area When making DC connections be absolutely certain to observe proper polarity in your wiring Note that other manufacturers may use the same type of DC power connector as does Yaesu but the wiring con figuration of the other manufacturer s plug may be different from that specified for your transceiver Ac cordingly you should verify the pin configuration of the plug before attempting to use a non Yaesu DC cable of any kind 2 Ground Connections Besides following the guidelines presented on page 8 carefully note that household or industrial gas lines must never be used in an attempt to establish an electrical ground Cold water pipes may in some in stances help in the grounding effort but gas lines represent a significant explosion hazard and should never be used 3 Electrical Shock Prevention Be certain that all station wiring is properly insulated so as to prevent short circuits which could damage this transceiver and or accessories connected to it Be sure to protect power cables from damage due to abrasion by ensuring that they cannot be walked upon nor crushed under rolling chairs etc Never route power cables near sharp metallic edges which might cut through protective insulation Never spill liquids into this trans
19. A fy 4 a wy 51 53 55 52 54 50 Lock Switch B This switch locks the settings of the VFO B knob and or the front panel keys Pressing this switch momentarily locks the settings of the VFO B Tuning Dial Pressing and holding in this switch for 2 second causes all the keys on the front panel of the transceiver except for the Lock switches to be locked When the Lock function is engaged the Lock indicator will be shown on the display panel 51 Menu Switch Pressing this switch momentarily activates the Menu mode which allows customization of many aspects of transceiver configuration 52 RX Car Switch Pressing this switch activates the RX Clarifier Off set Tuning from VFO A frequency feature When this feature is activated the VFO B Tuning Knob is used for Clarifier tuning up to an offset of 9 99 kHz 57 59 56 58 60 53 TX CLar Switch Pressing this switch activates the TX Clarifier fea ture allowing the transmit frequency to be offset from the VFO A frequency up to 9 99 kHz The TX Clari fier may be used in conjunction with the RX Clarifier or the chosen offset may be applied either to the RX or TX frequency singly 54 Clear Cuar Switch Pressing this switch clears any offset that has been established for the Clarifier returning it to a Zero Offset condition Pressing this switch only cancels the offset it does n
20. AF Gain control so you can turn the volume down if you like without affect ing the audio level being presented to your decoding device The connection to the Ar Out jack is at the same level as the connection to Pin 4 of the Data jack How ever the two output ports use independent output buffer amplifiers so you can freely connect and dis connect devices to from these ports without concern over the impedances and levels AFSK FSK ANTENNA B ANTENNA 4 Set the AFSK FSK Switch to FSK gt PTT Jack This RCA jack is wired in parallel with the Data jack s Pin 3 and may be used in conjunction with a com puter or TNC s PTT line if desired Partch Jack For transmit audio input for SSTV Slow Scan Tele vision operation you may connect the SSTV terminal s Tx Aupio line to the Patcu jack You will need to disconnect the microphone however during transmission as the Patcu jack is connected in a Y configuration along with the microphone input from pin 8 of the Mic jack DATA JACK RTTY Machine FP 1030A Pin 1 lt gt FSK OUT Pin 2 lt gt GND varm Pin 3 lt gt PTT Pin 5 lt _ gt NC RTTY Machine Oll PIT FSKOUT AFIN FD UT A E 5 pin DIN Pllug Pee 4 a Option P N P0091066 Supplie
21. ALC ALC Voltage SWR SWR as observed by the transmitter PA Comp Speech Processor Compression level VoL Final amplifier transistor supply voltag also displayed on receive AnP Final amplifier transistor drain current ALC ALC Voltage return to beginning of loop 8 IPO Switch The Intercept Point Optimization button switches the receiver RF preamplifier on and off When the switch is pressed the IPO icon appears on the display panel and the receiver RF preamplifier is bypassed When this switch is pressed again IPO will disap pear and the RF preamplifier returns to operation Best receiver sensitivity occurs when IPO is off However the RF preamplifier may not be necessary in noisy locations or on the lower frequencies in which case the IPO feature will provide improved immunity from intermodulation 9 Att Switch This switch may be used to reduce the input receive signal in one S Unit steps starting at 0 dB no at tenuation and sequencing through 6 dB gt 12 dB 18 dB gt 0 dB The attenuation level is shown on the display panel Best sensitivity will of course occur when no attenu ation is used 10 AGC Switch This switch selects the recovery time for the receiver AGC Automatic Gain Control system The selec tions available are in order AGC Fast Fast receiver recovery time AGC Stow Slow receiver recovery time AGC Orr AGC system disabled AGC Fast Fa
22. Accordingly any AT control program must con struct the five byte block by selecting the appropriate instruction opcode organizing the parameters if any and providing unused dummy argument bytes to pad the block to its required five byte length the dummy bytes can contain any value The resulting five bytes are then sent opcode last from the com puter to the FT 920 CPU via the computer s serial port and the transceivers HT jack Constructing and Sending HT Commands Example 1 Set VFO A to 14 250 00 MHz O Per the CAT Command Table the opcode for Set VFO A Frequency is OAH Note that the H following each byte value indicate hexadecimal base 16 values Placing the opcode into the fifth data bit position we then enter the frequency into the first four data bit positions fe ele le Hz Hz kHz kHz e Es The four argument byte values are constructed from the decimal value by breaking the frequency into 2 digit blocks in BCD packed decimal for mat Leading zeroes are required in the hun dreds of MHz place as well as the tens of MHz place when below 10 MHz O We now insert the four byte BCD coded frequency 00 50 42 01 into the five byte block along with the parameter byte resulting in a complete com mand string in hex format o o e o f on Data Argument Bytes Send these five bytes to the transceiver in the order shown in the table above left to right 0
23. Clarifier 36 VFO B Mode These icons display the operating mode in use on VFO B 37 Scan This icon will be illuminated during Memory opera tion when the currently selected Memory Channel has been tagged for inclusion among the channels to be scanned 38 Rx Tuner Tx These icons light up to indicate whether the Auto matic Antenna Tuner is connected to the Receiver or Transmitter stage respectively 39 CAT This icon will be illuminated when data is being passed to or from the transceiver s serial DATA port Dur ing operation using software which polls the radio s status frequently this icon may appear to be blink ing 40 VFO B Frequency Display This is the main frequency display for the transceiver s secondary B VFO Display resolution to 10 Hz is provided 41 Lock This icon is illuminated when the VFO B Lock func tion is activated so as to prevent inadvertent frequency changes 42 Bk INn During CW operation this icon will be illuminated if Full Break In QSK operation is selected 43 Kever This icon is illuminated in the CW mode when the built in Electronic Keyer is turned on 44 Track This icon will be illuminated during VFO Tracking operation whereby VFO A and VFO B are slaved under control by the VFO A Tuning Knob press and hold in the VFO A Lock key while rotating the tun ing dial to engage VFO Tracking 45 NR This i
24. Dumoprs Available Values J 3 m u V o o mm Default i This truncation is seldom used in contest numbers as it may cause confusion with the number 4 FT 920 Operating Manual U 30 5 F ORM Function Define the desired truncation for the 5 fig ure used in contest numbers Available Values i 5 e e o i E Default e e o This truncation is seldom used in incremented con test numbers although it frequently is used in the truncated form of the 599 signal report which may be shortened to ENN o m o o ahead of the incremented contest number 001 002 o o U 31 1 F OPM Function Define the desired truncation for the 7 fig ure used in contest numbers Available Values 7 o e o n B m e e o Default e e o This truncation is seldom used in contest numbers as it may cause confusion with the number 6 U 32 H P ORM Function Define the desired truncation for the 8 fig ure used in contest numbers Available Values fi 8 o o d D o e Default mms e Use this Menu Item to shorten the number eight in a contest number U 33 9 F ORM Function Define the desired truncation for the 9 fig ure used in contest numbers Available Values 5 9 e a N o Default m o This is perhaps the most commonly truncated num ber used in CW contests U 34 NAS TZE
25. above its default will allow the FT 920 to stay in the transmit mode be tween word spaces This function is analogous to the VOX Delay function on voice modes U 25 Go 0 NG Function Set the starting value for the Contest Num ber used by the message memory Available Values O00 9999 Default HULL If you should get out of sync with the automatic con test number incrementation of the message memory you may reset the number via this Menu Item In a contest this may be a good candidate for assign ment to an exclusive Quick Menu position U 26 a For Function Define the desired truncation for the fig ure used in contest numbers Available Values C O mm m k T Default O m O m _ oo mmm Use this Menu Item to shorten the number zero ina contest number U 27 FORM Function Define the desired truncation for the 1 fig ure used in contest numbers Available Values 1 A e m Default i Use this Menu Item to shorten the number one in a contest number U 28 2 F ORM Function Define the desired truncation for the 2 fig ure used in contest numbers Available Values 2 Li U e Default gt Use this Menu Item to shorten the number two in a contest number U 29 F ORM Function Define the desired truncation for the 3 fig ure used in contest
26. adjustment range over the left hemisphere The outer control adjusts the High Cut characteristics and its adjustment range is over the right hemisphere Do not attempt to adjust either of these controls past the 12 o clock position 67 NotcH Switch This is the On Off switch for the beat canceling DSP Notch filter FT 920 Operating Manual E L DESE S T S l NT a T ii TD Minii BOS lke cae A a 2 Sch PEENEERANETEEN En nnn nnne annen 979200 PROC IPG ATT 61218 AGC FS GC OFF NB HOA OME VFo MEM MTUNE GH 3 4 5 6 11 4 19 20 21 22 23 12 13 14 1 S PO Meter This meter scale indicates signal strength on receive and power output on transmit The characteristics may be changed between Instantaneous and Peak Hold by making the appropriate selection via Menu Item U 07 2 Transmit Multimeter In accordance with the corresponding setting of the Meter Select switch these meter scales provide dis play of the following transmitter performance param eters ALC ALC Voltage SWR SWR as observed by the transmitter PA Comp Speech Processor Compression level Vort Final amplifier transistor supply voltage also displayed on receive Amp Final amplifier transistor drain current 3 Proc This icon indicates that the Digital Soeech Proces sor is On 4 IPO This icon indicates that the Intercept Point Optimiza tion c
27. and may render the DSP more effective at eliminat ing beat notes adjacent frequency interference or noise To do this reduce the setting of the RF Gain control until the S meter hangs up approximately at the peak signal level of the interfering signal this places the incoming signals below the AGC Thresh old described on page 42 Now engage or adjust the necessary DSP features and you will in many circumstances find that interference rejection is im proved For maximum sensitivity the RF Gain control should be set fully clockwise IF Noise Blanker NB When automotive ignition noise power line noise or other impulse type noise is present the IF Noise Blanker feature may be engaged so as to minimize or eliminate the noise Press the NB switch so as to illuminate the NB icon on the display then rotate the NB LeveL control to the point of maximum noise elimination consistent with the maintenance of good signal quality Press the NB switch again to turn off the IF Noise Blanker Note Under extremely strong signal conditions ona crowded band such as during a DX contest etc excessive advancement of the NB LeveL control may cause somewhat degraded immunity from splatter from very strong nearby stations This general ten dency is typical of all IF noise blanker circuits and the FT 920 s circuitry is carefully designed to mini mize this characteristic Try reducing the setting of the NB LeveL control if this
28. applications The built in high speed automatic antenna tuner may be utilized both on receive and transmit providing im proved impedance matching for the transmitter and protection from out of band signals on receive A built in Digital Voice Recorder allows storage and playback of incoming signals and also allows you to store up to four repetitive messages such as CQ Contest of up to 16 seconds each And the Electronic Memory Keyer also provides storage of CW messages including incremented imbedded contest numbers to reduce operator fatigue in contests Independent Key jacks on the front and rear panels allow connection of keyer paddles to one jack and a computer or straight key to the other for optimum contest work A CW Pitch control and Spot tone provide efficiency in operating and both full QSK and semi break in CW VOX switching are provided The receiver section is highlighted by the high performance Digital Signal Processing filters which provide razor sharp selectivity an automatic seeking Notch filter and Noise Reduction The high intercept front end circuitry includes ten input bandpass filters with PIN diode switching optimized RF preamplifiers for both high and low bands and Intercept Point Optimization IPO for high signal high noise environments A separate receive only antenna jack is provided in addition to the two main TX RX jacks for connection of a Beverage or other low noise receiving antenna Yaesu s
29. are pressed so these features are both on the FT 920 will FT 920 Operating Manual SI remain in the Semi Break In mode For low power operation rotate the RF Pwr con trol counter clockwise until the desired power out put is observed on the transmitter meter Electronic Keyer Operation The built in Electronic Keyer may be used alone or in combination with an external keying device such as a computer driven keying interface Connect your keyer paddle s cable to the front panel s Key jack If you wish to use the rear panel Key jack connect the paddle s cable to that jack and set the rear panel s Pot Key switch to Pot Confirm that the controls and switches are set up as they were originally for Straight Key operation on the previous page Press the Kever switch to turn the electronic keyer on The Keyer indicator will appear on the dis play Close the Dot contact on the paddle and rotate the Kever SPEED control to set the electronic keyer s speed to the desired level Clockwise ro tation increases the sending speed Adjust the sidetone to a comfortable level by ro tating the Sipe Tone control Select Semi Break In or Full Break In as desired as you did during Straight Key operation The weight proportion of dots to dashes may be adjusted each parameter individually in the event you wish to modify the relationship from the de fault 1 1 3 Dot Space Dash ratio Use Menu Items
30. be disabled You as the station control operator are responsible to restrict your transmis sions to those frequencies on which you are autho rized to operate Attempting to transmit outside of an amateur band segment will cause the Error diagnostic message to appear on the display Whenever the transmitter is activated the FT 920 s built in directional coupler detects any reflected power which appears at the final amplifier s output port due to antenna system impedance mismatch and dis ables the transmitter if too much reflected power is found in which case the Hi SWR icon will become illuminated You should cease transmission imme diately and determine the cause of the antenna sys tem fault The upper limit of the transmitter s power output can be set via Menu Items U 49 for Antenna A and U 50 for Antenna B separately for each an tenna port See page 79 for details Automatic Antenna Matching The built in automatic antenna tuner unit is capable of matching antenna systems presenting impedances within the range 16 5 150 Q which corresponds to a maximum SWR or approximately 3 1 If the antenna s you re using exceed this SWR as config ured you must make adjustments electrical and or mechanical so as to present an impedance closer to 50 Q to the FT 920 s Antenna jack s Remember that the net SWR as detected by the FT 920 may be different than the SWR at the antenna feedpoint depending on the
31. controls may be used to optimize the audio bandwidth so as to reduce interference and noise and maximize signal to noise ratio To activate the DSP passband filter press the DSP key located just below the Suirt control The DSP key contains an LED which will glow green when the DSP is on Now rotate the Hien Cut and Low Cut to roll off interference and or noise or to enhance the sound of the incoming signal A graphical represen tation of the relative width of the DSP passband can be displayed on the Enhanced Tuning Scale by mak ing the appropriate configuration of Menu Item U 10 See page 74 for details Press the DSP switch again to turn the DSP pass band filter off Note Since the DSP passband filter operates in the audio section after the AGC detector very strong signals inside the IF passband but outside the DSP FT 920 Operating Manual 43 44 passband may cause interference to reception by pumping the AGC causing the desired signal to fade in and out rapidly Engage the Narrow CW filter if installed or use the SuiFt control to roll off the of fending signal before it reaches the DSP stage Norcu Filter DSP Unwanted beat notes inside the RX filter passband can be effectively removed by utilization of the DSP Notch function The DSP system will detect the beat note then automatically center a sharp notch filter to eliminate the beat note If multiple beat notes are present the DSP will creat
32. counter clock wise so as to use the minimum power necessary to gain access to the repeater This will signifi cantly reduce the amount of heat generated by the transmitter section Since repeaters do not all use the same access tone we recommend that you load your favorite repeater frequencies into memory to avoid the inconvenience of always having to reset the CTCSS tone frequency When a repeater fre quency is stored into memory the receive fre quency shift direction shift magnitude and tone information are all stored into the memory regis ter See page 59 for details of memory operation Linear Amplifier Tuning A special feature of the FT 920 allows you to do low duty cycle tune up of your linear amplifier by trans mitting a high speed pulse instead of a continuous carrier Here is how to do this Press Menu to enter the Menu mode Select Menu Item U 55 by rotating the VFO B Tuning Dial then press Ent and rotate the VFO B Tuning Dial to select the amount of time you want the pulser to be active the default time pe riod is 10 seconds Now press Ent again Rotate the VFO B Tuning Dial to select Menu Item U 52 LI TU S When you press Ent the pulser will commence transmission The number of sec onds remaining in the transmission will appear on the main frequency display area Once the countdown is complete the Menu dis play will say OFF and you may either repeat the t
33. exclusive Shuttle Jog tuning dial provides simple yet quick frequency excursions around the band Independent tuning knobs for the two VFOs join direct keyboard frequency entry one touch band change and extensive scanning capabilities to make the FT 920 a joy to use And the FT 920 s extensive memory system sporting 99 regular memories ten split frequency memories five QMB Quick Memory Bank channels and an easy access Call channel for each band provides the utmost in operating ease Each of the memories ex cept the QMB channels can be assigned an alpha numeric label of up to seven characters to aid in memory channel identification A host of convenience features is provided including a Digital Soeech Processor SSB monitor circuit all mode Squelch VOX and a continuously variable RF power control Yaesu s CAT System for external computer con trol includes a built in RS 232C level converter and DB 9 serial port on the rear panel for easy connection to your home computer And the extensive Menu system allow the owner to configure literally dozens of transceiver performance characteristics such as voice audio response patterns keyer weight tuning steps and power output to be applied to each antenna jack The FT 920 clearly is the cost performance leader in the Amateur Radio industry today Please take some time to familiarize yourself with the many features available in the FT 920 as described in the pages to follow At Yaesu
34. have a par ticular need to do so Although the MOSFET preamplifier provides higher gain the JFET preamplifier yields higher dynamic range with respect to out of band signals Switching to the MOSFET preamp on 40 meters will undoubtedly provide a higher S meter read ing However the useful sensitivity will probably not change On the other hand when using a Beverage or small loop antenna for receiving on the low bands the MOSFET preamp may be the better choice Remember if you can hear background band noise appear when you connect your antenna you already have adequate sensitivity Any in crease in front end gain beyond this point will not improve the signal to noise ratio on the incoming signal The preamplifier chosen will always be on unless the IPO key is pushed See the discussion of IPO operation below in the section regarding Tools for Strong Signal and Low Frequency Operation AGC Automatic Gain Control Selection The AGC system of the FT 920 s receiver prevents potential ear damage and or overload of receiver components by establishing an AGC Threshold of signal input Once the AGC Threshold is reached further increase in signal strength does not result in an increase in audio output The recovery time of the AGC system the time re quired for the receiver to recover to full sensitivity is variable and you may select the AGC recovery time which provides the most operator comfort T
35. is observed and try to utilize the DSP Noise Reduction to compensate see below DSP Noise Reduction NR The DSP system of your FT 920 includes a highly effective Noise Reduction circuit The DSP Noise Reduction is particularly helpful in enhancing signal to noise ratio by lowering the overall level of back ground noise The DSP Noise Reduction works to improve on the action of the IF Noise Blanker by elimi nating lower level non impulse type noises that are difficult for the IF Noise Blanker to detect To activate the DSP Noise Reduction rotate the NR control clockwise from its default position which is fully to the left Adjust the setting of the NR control until the best signal to noise ratio is achieved Also try adjusting the setting of the RF Gain per the dis cussion previously to see if reducing the RF IF gain FT 920 Operating Manual level will enhance the performance of the DSP Noise Reduction To turn the DSP Noise Reduction off rotate the NR control fully counter clockwise As you tune around the band while using the NR circuit you may discover that the apparent pitch of the background noise changes somewhat af ter you encounter signals The NR circuit is an adaptive filter which form fits around a signal so this observation is completely normal Tools for Strong Signal and Low Frequency Operation Operation on the lower HF Amateur bands 160 through 30 meters presents special challe
36. ment by pushing and holding in the Tuner key for 2 second Press the V gt M switch momentarily to enter the Memory Check mode which is used to find an unused memory channel The M CK indica tor on the display panel will blink and the frequency stored if any on the current memory channel will be shown in the VFO B display area Note The VFO B Tuning Dial may also be used for the M CK mode See Memory Channel Se lection using VFO B Tuning Dial at the right Use the UPA or Down Y key to increment through the main channel bank Frequency data stored previously in memory channels will be dis played in the VFO B display area If you have re stricted memory operation to one channel group by pressing the Mem Group key memory stor age will similarly be limited to the currently selected memory group just press Mem Group again to allow unrestricted access to all memory channels for storage of your frequency data When you have selected the channel location into which to store the frequency information press and hold in the V gt M key for 1 2 second until you hear a double beep which confirms that the frequency information was successfully stored Note If information was previously stored on the channel into which you stored data in step above the previous data will be overwritten and lost Memory Channel Recall Ifyou currently are in the VFO tuning mode press the VFO
37. per the information and illustration below 17 A B Press this switch to toggle between an tennas connected to the A and B connectors on the rear panel The indicator Ant A or Ant B will appear on the display panel to indi cate which antenna is in use The antenna selec tion will be maintained in the VFO or Memory reg ister in use 18 Rx When this switch is pressed the receiver s input is connected to the receive only Rx In RCA connector on the rear panel of the FT 920 This feature allows connection of a low noise receiving antenna or a VHF UHF receive converter When the Rx button is pushed the Rx Ant indicator will appear on the display panel See the drawing on the next page for details 19 Sat Squelch Control This control active in all modes may be used to si lence background noise when no signal is present Most frequently used during FM operation this con trol must be rotated fully counter clockwise for most SSB CW or AM operation 30 20 Proc Compression Level Control This control is used to adjust the compression level of the digital soeech processor during SSB opera tion Clockwise rotation increases the compression level 21 Proc Switch Pressing this switch activates the digital SSB speech processor for enhanced talk power under difficult conditions The Proc indicator will appear on the display panel when the speech processor is activated
38. repeaters requiring it Both the CTCSS tone frequency and repeater shift may be changed via the Menu system 37 DW Switch Pressing this switch activates the Dual Watch fea ture 24 EEEEEEEEEEErEEEEE EEE FT 920 Operating Manual 38 V gt M Switch Pressing this switch for Ye second transfers the con tents of VFO A into a memory register 39 V gt M Switch Pressing this switch for Ye second transfers the con tents of the currently selected memory channel into VFO A 40 Keypad The keypad is used for one touch band selection as well as direct frequency entry during VFO operation During FM transmission the Keypad also serves as a DTMF Encoding Keypad for Autopatch operation 41 QMB Rc Switch This switch is used for one touch recall of Quick Memory Bank memories Pressing this switch causes the QMB memories to be recalled sequentially 42 QMB Sto Switch This switch is used for storing VFO A frequencies into the QMB memory registers 43 Rec Switch Pressing this switch causes the built in Digital Re corder to start recording the contents of the receiver s incoming audio Pressing the Rec switch for 1 2 sec ond followed by the 1 2 B or 4 key on the Key pad causes the Digital Voice Message recorder to start recording 44 Pray Switch Pressing this switch initiates playback of the receiver s Digital Recorder 45 Up A Down Y Keys Pressing th
39. rotate the SQL control fully counter clockwise General Coverage Reception You may have noticed that if you tune outside of one of the 500 kHz segments which contains an Amateur band the Gen icon on the display becomes illumi nated This indicates that the transceiver is now re ceiving in the General Coverage mode On such frequencies the transmitter is disabled If you try to transmit ERRor will appear on the display Since the FT 920 is chiefly an Amateur transceiver the one touch band keys do not recognize non Ama teur bands However you may use direct frequency entry to establish a starting point in for example a shortwave broadcast band you may then use the tuning dial s and or the Up Dwn switches to move around the band You may also program a favorite frequency in each broadcast band into memory then recall it quickly as a starting point for memory tuning See the section on Memory operation beginning on page 59 for details Otherwise the FT 920 s receiver facilities completely support General Coverage reception and you will FT 920 Operating Manual enjoy the many interesting aspects of shortwave lis tening Among the transmission often encountered are International Shortwave Broadcasts see table below Maritime and Aeronautical Communications transoceanic airliners etc News Services and Diplomatic Embassy Traffic Military Communications WeatherFax Transmissions satellit
40. switching from CW to LSB requires retuning the desired station This can be par ticularly inconvenient when working a station in the 75 meter voice band LSB and you ask him to move to CW on the same frequency To eliminate the need for retuning in this situa tion you may switch the receiver CW carrier injection point to the reverse LSB side When you press CW you should notice that the USB indicator just above CW on the main display will blink for a couple of seconds while the CW indicator glows steadily This indicates that USB side injection is currently in use If you press CW once more the LSB indicator will now blink informing you that LSB side injection is now in use When using LSB side injection you can freely switch between CW and LSB without having to retune the other station Note that in the LSB and CW LSB modes the received signal pitch now increases as you increase the Norrsl CW S1 VFO frequency ki To return the re ceiver to the de fault USB side in jection method just push CW again CW REVERSE LSF RX assband Operating Hint An added benefit of this fea ture is the potential to eliminate interference If you are experiencing QRM from a CW station that the IF Shift and or DSP are unable to elimi nate you should try switching to the reverse CW sideband retuning the desired CW signal and adjust the IF Shift and or DSP again
41. the scanner will re sume irrespective of the presence or absence of a signal on the current frequency U 17 SON FES Function Set the delay time for scan resumption in the PAUS scan condition described in Menu Item U 15 mar UAR Available Values u tf Seconds Default i Second You will generally want to set a fairly short value for this Menu Item so as not to delay the resumption of scanning after a signal disappears U 18 Iw TIME Function Set the polling interval for the Dual Watch system Available Values 3 5 Default i Seconds This Menu Item defines the amount of time the Dual Watch system will dwell on VFO A before checking VFO B for activity Seconds U 19 ENSP w Function Set the amount of time per synthesizer step in the VFO PMS Scan modes Available Values ii ms in 1 ms steps Default if ms Use this Menu item to select the amount of time each step of the synthesizer will be allocated during VFO Scan or PMS operation U 20 EL SET Function Select the keyer paddle operating mode Available Values i biS Eic Default Fi This menu Item allows selection of the preferred key ing action of your paddle The choices available are L i lambic keying with Automatic Character Spacing disabled fii Mechanical Bug key emulation The dot paddle contact produces automatically gen erated dots while the dash contact pro duces dashes of a length pro
42. typically on 29 MHz When the repeater shift direction is negative the RPT icons are illu minated when the repeater shift direction is positive the RPT icons are lit 28 T This icon is illuminated when the CTCSS Tone En coder is activated during FM Repeater operation 29 SQL This icon is illuminated when the CTCSS Tone De coder is activate during FM repeater operation 30 Wart This icon will be briefly illuminated during antenna tuning before a satisfactory match has been achieved by the Automatic Antenna Tuner 31 Hi SWR If the Automatic Antenna Tuner is unable to achieve a satisfactory match this icon will become illuminated Transmitter power output will be significantly reduced when the Hi SWR icon is lit You should check your antenna system connectors and cables to determine and repair the cause of the fault 32 M Ck This icon is illuminated when the scratchpad Memory Check mode is activated In this mode you may inspect and select the memory channel to be used if and when the Memory Recall mode is se lected 33 Group This icon is illuminated when the Memory system is restricted to the Memory Group mode See page 61 for details FT 920 Operating Manual 34 Memory Channel Display Field This area of the display indicates the Memory Chan nel number 35 OFFSET This icon is illuminated when the Multi Display Panel is displaying the frequency offset of the
43. understand the differences between the two keying methods provided on the FT 920 for digital mode operation so that the controls and switches may be set correctly O Most operation is accomplished using Audio Frequency Shifted Keying AFSK whereby the Terminal Node Controller TNC generates audio tones to be transmitted as data by the FT 920 To activate this mode of operation the front panel Mode selection must be set to DATA USB even though USB may not be the actual sideband utilized in operation and the rear panel AFSK FSK switch must be set to AFSK O The FT 920 can also accept input from a TNC or Terminal Unit TU operating in the FSK Fre guency Shifted Keying mode whereby a clo sure to ground of the FSK keying line causes the transmitted carrier to be shifted in fre quency no audio tones are produced by the TNC or TU AFSK RTTY or Packet Operation The AFSK configuration environment may be the easiest for you to use as the TNC then has total con trol of the tone frequencies Mark Space relationship normal inverted and other aspects of digital opera tion which are critical to successful operation Connect your TNC to the FT 920 s Data jack per the instructions on page 16 Pin 1 of the Data jack should be connected to the TNC s Mic Aupio or Tx Aupio line Be sure to set the AFSK FSK switch to AFSK For AFSK RTTY Baudot or 300 bps HF Packet operation press the Data mode k
44. we appreciate your investment in this fine transceiver and we hope that you will take the time to read this manual thoroughly so as to get the most out of your new FT 920 eee FT 920 Operating Manual General Receiving Frequency Range Transmitting Frequency Range Operating Temperature Range Frequency Stability Frequency Accuracy Emission Modes Frequency Steps Antenna Impedance Antenna Tuner Matching Range Power Consumption Supply Voltage Dimensions Transmitter Power Output Modulation Types Maximum FM Deviation FSK Shift Frequencies Packet Shift Frequency Harmonic Radiation SSB Carrier Suppression Undesired Sideband Suppression Audio Response SSB DSP Off SSB 3rd order IMD Microphone Impedance 100 kHz 30 MHz 48 56 MHz 160 6 Meter Amateur Bands 10 50 C 10 ppm 2 ppm w TCXO 7 lt 7 ppm FM within 500 Hz w TCXO 7 lt 3 5 ppm FM within 460 Hz USB LSB CW AM FM FSK AFSK 1 Hz 10 Hz 100 Hz for SSB CW FSK AFSK 10 Hz 100 Hz 1000 Hz for AM FM 50 Q unbalanced 16 59 1500 Input Rx no signal Rx Signal present Tx 100W 13 5 VDC 2 0A 2 5A 22A 13 5 VDC 10 negative ground 410 W x 135 H x 316 D mm 160 m 10 m amateur bands Adjustable up to 100 Watts 25 Watts AM carrier 6 m amateur band Adjustable up to 100 10 Watts 25 2 5 Watts AM carrier SSB J3E Balanced filtered carrier AM A3E Low level early stage w optional YF 116A AM F
45. 0 50 42 01 OAH Example 2 Store the above frequency 14 250 MHz into Memory Channel 1 48 O Memory operation is exercised by Opcode 03H In base 16 hexadecimal Memory Channel 48 is channel 30 And pursuant to Note 2 associ ated with Opcode 03H parameter P2 Memory Set must be set to value 00 Therefore the cor responding five byte command parameter block would be 00 00 00 30 OSH ZARARA Data Argument Bytes In sum commands are sent in the following general format Byte 5 Opcode P4 P3 P2 P1 Byte 1 Byte 2 Byte 3 Byte 4 FT 920 Operating Manual Downloading FT 920 Data On command the FT 920 will download some or all of its operational data By regular polling of the trans ceiver your software can be kept continuously up dated on the status of the FT 920 operating environ ment The following commands cause the FT 920 to down load various components of its operational status Status Update 10H this Opcode causes the transceiver to download frequency and memory channel data per the parameter data supplied in the Status Update request parameters P1 amp P4 Status Flags Request FAH this Opcode in structs the transceiver to download eight status flag bytes Read Meter F7H this Opcode causes the trans ceiver to download meter deflection data in packs pursuant to Note 12 following the Opcode Com mand Chart on page 86 Pacing OEH this Opcode sets the delay between byte
46. 0 MHz FM can be stored into regular memory channels there is no need to utilize the Split memories described later for repeater operation Moreover Clarifier data is also stored into regu lar memory locations so small lt 9 99 kHz Tx Rx splits can be accommodated using the Clari fier Memory Operation on Split Frequency Channels Memory Group Information The FT 920 s main memory area may be divided into as many as four groups These groups may in some instances provide more efficient or intuitive memory operation for example you might wish to segregate memories according to operating objectives such as o AM Broadcast Stations g Shortwave Broadcast Stations g HF Amateur Stations g 50 MHz Amateur Stations Once you have determined how many memories are to be designated in each group see Menu Items U 11 U 14 you may restrict memory operation just to one group or you may allow the memory channels to be selected without regard to memory group boundaries The complete memory channel number is composed of two sets of numbers separated by a hyphen The single digit before the hyphen is the memory group number 1 2 3 or 4 The second two digit number is the channel number itself 1 to 99 Therefore if channel 34 is assigned to group 1 its channel number is 1 34 If you have created four channel banks of 24 25 channels each channel 34 would be designated 2 34 since it falls wit
47. 0 Q OMe Fragua SWR 3 0 SWR 2c E FT 920 Operating Manual SSB Transmission Basic Operation Connect your microphone to the front panel Mic jack Preset the front panel controls as follows Mone LSB or USB depending on band use USB on 14 MHz amp higher bands Meter SELect ALC Mic Gain 9 o clock position RF Pwr Fully clockwise Press the microphone s PTT switch and speak into the microphone at a normal voice level The Transmit indicator in the display will be illuminated and the ALC meter will deflect according to the peaks in your speech Adjust the Mic Gain control so that the ALC meter peak reading is along but not beyond the right edge of the ALC range on the meter ALC a BERR RRR BOOOOOUO000000000 Set Mic Gain for ALC within this range Release the PTT switch to return to the receive mode For operation at lower power levels rotate the RF Pwr control counterclockwise while watching the PO scale on the meter so as to set the desired power level Counterclockwise rotation of the RF Pwr control or operation using an antenna with an impedance greatly different from 50 Q may result in a higher reading on the ALC meter Therefore it is helpful to make initial adjustment of the Mic Gain control into a 50 Q dummy load or carefully matched an tenna and with the RF Pwr control fully clock wise VOX Operation When operating in the SSB AM or FM modes you may use the VO
48. 00A8X Desk Microphone to ini tiate scanning The transceiver will now scan within the range 50 000 to 50 400 MHz halting on any signals received then resuming its scan based on the setting of Menu Item U 15 see below Note that these band limits do not apply just to scanning they are also applied to the operation of the VFO A Tuning Dial so the PMS feature makes it easy to stay within a particular band of operation whether tuning manually or scanning Scan Resume Choices Scanning operation requires that you have the FT 920 s audio squelched The transceiver then assumes that the opening of the squelch corresponds to the discovery of a signal you may wish to listen to Once the scan has been halted one of three things may happen O The default action is that the transceiver pauses on the signal and stays locked on its frequency until the other station s transmission ceases at which point the squelch will close One second after the squelch closes scan ning resumes automatically The resumption interval is adjustable from 0 to 10 seconds via Menu Item U 17 see page 75 O Another option is that the scanner will halt when the squelch opens for a fixed time pe riod default 5 seconds Thereafter scan ning will resume whether or not the other station s transmission has ended The hold time is adjustable from 1 to 60 seconds via Menu Item U 16 see page 75 O The scanner can also be programmed to stop
49. B DATA FM P1 8B DATA FM Note 7 Status Update Data P1 01 Memory Channel Number 1 byte P1 02 Current Operating Data for VFO Memory 28 bytes P1 03 VFO A and VFO B Data 28 bytes P1 04 Memory Channel Data 14 bytes P4 01 89 Memory Channel Number used when P1 04 01 63 Memory Channels 1 01 1 99 64 6D Memory Channels d 01 d 10 VFO A 6E 78 Memory Channels C 01 C 11 79 7A Memory Channels P Lo P Hi 7B 84 Memory Channels d 01 d 10 VFO B 85 89 QMB Memories S 01 S 05 Note 8 P3 00 Keyer Memory 0 P3 01 Keyer Memory 1 P3 02 Keyer Memory 2 P3 03 Keyer Memory 3 P3 04 ID Memory P3 05 Contest Number Memory P3 06 Keyer Memory Down P3 07 Keyer Memory Up P3 08 Keyer Memory Playback no Tx P3 09 Write Memory Note 9 The frequency is converted to its BCD coded components For example to convert 14 256 78 MHz P1 P2 P3 P4 L en h 5 Byte Block 8A 01 42 56 78 T Opcode Note 10 VFO A Mode Parameters VFO B Mode Parameters P1 00 Wide P1 80 Wide P1 01 Wide P1 81 Wide 02 Narrow P1 82 Narrow 03 Narrow P1 83 Narrow P1 04 Wide P1 84 Wide Note 11 P1 00 28 Tone Encoder Frequency Hex P2 00 27 Tone Decoder Frequency Hex Note 12 A digitized meter deflection indication is returned with value be tween 0 and FFH four sets of this data are sent plus one pad ding byte OF 7H as follows Meter Byte Meter Byte
50. D MIC as Viewed from front panel as Viewed from rear panel see a N A CNS SERIAL OUT Pane SERIAL IN BAND DATAA Ne pe BAND DATA B C NA BAND DATA C a N A BAND DATA D SNe LINEAR oe i NC as Viewed from rear panel as Viewed from rear panel PHONES as Viewed from rear panel CY SIGNAL R ay De SIGNAL L AFSK FSK SWITCH EXT SPKR RCA PLUG AFSK GND or DATA IN iT GND PTT e DATA QUT 4 DATA OUT BUSY 5 BUSY SIGNAL GND SIGNAL or FRONT REAR KEYER SWITCH ON KEYER SWITCH ON KEYER SWITCH ON PDL KEY SWITCH PDL PDL KEY SWITCH KEY KEY PTT GND DOT DASH COMMON DOT DASH COMMON KEYER SWITCH OFF KEYER SWITCH OFF KEYER SWITCH OFF PDL KEY SWITCH PDL PDL KEY SWITCH KEY FT 920 Operating Manual Preliminary Inspection Inspect the transceiver upon opening the packing carton Check that all controls and switches work freely and inspect the cabinet for any cosmetic dam age Ensure that the accessory cable and fuses are included If any damage is found document it completely and contact the shipping company or Dealer if you pur chased it over the counter right away Save the pack ing materials in case you need to return the set for service DC Power Connections The FT 920 Transceiver is designed for operation from 13 5 Volts DC negative ground with the DC source being capable of providing 20 Ampe
51. Default af F If for example Group 2 contains Memory Channels 26 through 40 Group 3 begins with Memory 41 U 14 GFGUPY Function Select the number of memories in Group 4 Available Values The last digit in Group 3 plus 1 is the bottom end of Group 4 99 maximum Default af F You do not have to use all 99 memories Just set the upper limit of this Menu Item to some value less than 99 J4 __ rr FT 920 Operating Manual U 15 47 Ne OTP Function Select the desired Scan nesumtle mode Available Values PAU S 5560 Stat Default PALS This Menu Item allows you to select your favorite method of scan restart after the scanner has stopped on an incoming signal when the Squelch opens The choices are IAT re The scanner will hold until the signal disappears then will resume after a delay set via Menu Item U 17 The scanner will hold for a fixed length of time set via Menu Item U 16 then resume whether or not the other sta tion is still transmitting The scanner will stop when a signal is received and will not restart U 16 PRUSE T Function Set the delay time for scan resumption in the SSEC scan condition described in Menu Item U 15 Available Values fi Seconds Default Seconds This Menu Item defines the length of time the scan ner will dwell on a frequency when in the 5 Second mode so named after its default value After the time period set via this Menu Item
52. FT 920 OPERATING MANUAL YAESU MUSEN CO LTD 1 20 2 Shimomaruko Ota Ku Tokyo 146 8649 Japan YAESU U S A 17210 Edwards Rd Cerritos CA 90703 U S A YAESU EUROPE B V Snipweg 3 1118DN Schiphol The Netherlands YAESU UK LTD Unit 12 Sun Valley Business Park Winnall Trading Estate Winchester Hampshire S023 OLB U K YAESU GERMANY GmbH Am Kronberger Hang 2 D 65824 Schwalbach Germany YAESU HK LTD 11th Floor Tsim Sha Tsui Centre 66 Mody Rd Tsim Sha Tsui East Kowloon Hong Kong Table of Contents General Description 0 0 0 0 cece eeeeeseeeeneeeeeeneeeeeeaees 1 Specifications bow Accessories amp Options 0 0 0 0 ccceecceeeeeeeeeeeteeeeneeeaeee 4 Plug PINOUT e ck enaa anaa aa RAN aara Nidai e AE RGIA 5 Installation Pern Preliminary Inspection 00 eee cece eect teneeeeeeees 6 DC Power Connections 00 ccccceceeeeeeeeeteeeeeeeeeneeees 6 Transceiver Location das Grounding ose eeceeeeeeceeeeeeeeeeeeeaeeeeeeaeeeaetaeeeaeeeretaeeeaeeaes Antenna Considerations cecceceseeeeeneeeeeeneeeeees 9 Memory Backup eee Adjusting the Front Feet c cecsceeseeseeeeeeeeseeeeeeeeenes 10 Safety Precautions eeen 11 1 Power Connections n11 2 Ground Connections i e 11 3 Electrical Shock Prevention 14 4 Antenna Precautions cceeeeeeeeeeeeteeeeeeeeeeeees 11 5 RF Field Exposure Advisory and Electromagnetic Compatibility 12 Accessory Installa
53. Function Set the number of digits in a contest num ber Default 10 The default value places a contest number without leading zeroes in the contest number message memory location at the point where is inserted The other choices are 349 A full three digit contest number including zeroes This will switch automatically to four digits after QSO number 999 3555 A full four digit contest number including zeroes If you reach 9999 QSOs you prob ably already won the contest and can now quit aF F In this mode the contest number genera tor is disabled U 35 CHE TONE Function Define the type of repeater access tone to be transmitted on 28 MHz during FM RPT opera tion Available Values 55 u t Default t155 The default value causes a tone set via Menu Item U 37 to be transmitted continuously when the RPT FM mode is in use The BURST option transmits the selected tone for an interval of only 500 milliseconds and typically only the 1750 Hz tone selection would be applicable for BURST operation U 36 V HF TONE Function Define the type of repeater access tone to be transmitted on 50 MHz during FM RPT opera tion Available Values 55 u t Default 655 The default value causes a tone set via Menu Item U 37 to be transmitted continuously when the RPT FM mode is in use The BURST option transmits the selected tone for an interval of only 500 milliseconds
54. Insert your key s plug into either Key jack Set the other controls as follows Mope CW Kever Off No icon should appear on display RF Power Fully clockwise Sipe Tone 12 o clock position VOX Off Bx In Off Po Key Confirm that this rear panel switch is set to Key If you close the key at this point you will hear the CW side tone in the background but you will not be transmitting This mode allows you to adjust the Sie Tone control for a comfortable volume level and it is also useful if you wish to practice sending For Semi Break In operation press the VOX switch Now when you press on the key the trans mitter will automatically activated and after you quit sending the FT 920 will return to the receive mode The Hang Time for the CW VOX cir cuitry is adjustable Separately for the CW mode as opposed to SSB via Menu Item U 24 See page 76 For Full Break In QSK operation turn the VOX off and press the Bk In switch Now press ing and releasing the key will cause instantaneous TX RX switching in tandem with your keying al lowing you to hear any incoming signals in the spaces between dots dashes and letters in your sending This may be particularly helpful for mes sage handling or contest operation When the VOX is on pressing the Bk In switch does not cause QSK operation to be activated as the VOX command will override the Break In command When both switches
55. L control will cause the signal to noise ratio on your speech signal to deteriorate thus reducing the effectiveness of the speech proces sor Keeping the compression level below 10 dB will ensure that this does not occur DSP Voice Pattern Contours If you wish to enhance the effectiveness of your speech processing system you may choose from one of four voice pattern contours which are provided via Menu Item U 51 See page 80 OFF DSP microphone equalization is disable 1 Mid and high frequency components are enhanced 2 A high emphasis response is produced ideal for pile up or contest work 3 Both low ang high emphasis response are produced 4 A wide bandpass response is produced emulating a Broadcast microphone audio characteristic Once you have selected the desired voice pattern contour press the DSP switch to activate the Digital Signal Processing DSP system No further adjust ment should be necessary The Voice Pattern Contour feature may be used alone or in conjunction with the Digital Speech Processor Experiment with these systems singly and in combination to determine which setting provides the best talk power and audio quality in relation to your voice s characteristics Voice Monitor Operation The Monitor function allows you to observe the char acteristics of your speech signal so as to make ad justments of the DSP AM or FM modulation charac teristics etc Press the Moni switch t
56. MOX once to activate the transmit mode and press it again to release the FT 920 back into the receive mode Be sure to have an antenna or dummy load connected to the transceiver when this switch is pushed Failure to do so may cause damage to the transmitter s final amplifier stage 3 VOX Switch This switch enables automatic voice actuated trans mitter switching in the SSB AM and FM modes as well as semi break in CW Press the VOX switch once to activate VOX and again to disable VOX and return to PTT operation 4 PHones Jack This 3 pin jack is used for connection of head phones When a plug is inserted into this jack the internal external speaker will be cut off This jack is optimized for use with 16 Q to 32 Q headphones and will accept either monaural or stereo headphone types 5 Key Jack This 14 3 pin jack is used for connection of a CW keyer paddle or a straight key Use only a 3 pin ste reo plug in this jack if you attempt to use a 2 pin plug a constant CW carrier will be sent out The pinout is shown on page 5 6 Mic Jack This 8 pin connector accepts microphone input as well as providing PTT ground and scanning control access Proper microphone impedance is 500 600 Q FT 920 Operating Manual 7 Meter SELEcT Switch This switch is used to select the display function of the transmission multimeter with the selections be ing provided in the following sequence
57. Men key once to enter the Memory mode the Mem icon will appear below the main frequency display To select another memory channel press either the Ur A or Down key Repeated pressing of one of these keys allows you to step through the memory channels one at a time or you may hold in the UPA or Down Y key to step through the channels in a manual scan mode Note The VFO B Tuning Dial may also be used for Memory Channel selection See Memory Channel Selection using VFO B Tuning Dial be low To restrict your memory channel selection just to one memory group press the Mem Group key once the Group icon will appear above the chan Memory Channel Selection Using VFO B Tuning Dial You may find it more convenient to use the VFO B Tuning Dial instead of the UPA and Down Y keys for memory channel selection Here s how to do this Press the Mem Cu key located below and to the left of the VFO B Tuning Dial mo mentarily The brackets surrounding the memory channel number display will start to blink Now rotate the VFO B Tuning Dial You will observe the channel numbers changing and you may select the desired memory channel quickly in this manner To revert to normal operation of the VFO B Tuning Dial press the Mem Cu key once more FT 920 Operating Manual nel number Now only those channels within the current memory group designated by the digit
58. O B If this LED is pushed while it is already illuminated the FT 920 will be placed in the reduced power Approx 10W TX MUTE mode In this mode the Orange LED will blink 48 VFO B Tuning Dial This knob is the tuning dial controlling the frequency of the Sub VFO B Clockwise rotation of the knob increases the frequency while counter clockwise ro tation decreases the frequency The tuning steps of the rotary encoder coupled to the VFO B Tuning Dial are shown below STEP No mal Fast Fine Operating Mode 49 Mem Cu Switch Pressing this switch changes the operating configu ration for the VFO B Tuning Dial If this switch is pressed the VFO B Tuning Dial will switch from VFO operation to Memory Channel se lection Press the switch again to return to VFO op eration FT 920 Operating Manual 23 61 62 63 64 iN a Ve GRC oe pz HF SOMHz TRANSCEIVER FT 520 Ti eee _ z a E aX VEC B ance haz Veg AA Eisrtay are ame LT Yes J O SS Ret ow vem Mev UMA 2 ND AT n A l 35 RLC tz 1 ate Al co J LU J nl eee ee EE g 1E 1 4 STO J aT 4 k Aj Ant l yA J L pa a 21 245 E RES spa Ne mY gt MEME S pray PENce 5 a EN FAE DOWN UP MENU SHIFT C 5 65 Eg Nae CUT 00 66 50 aok TT CD D Low 9 IGH D 67 CUT oo S o s
59. Range Frequency Range Matching Time Matched SWR 16 7 Q 150 Q 1 8 30 MHz 25 0 Q 100 Q 50 54 MHz 160 m 6 m amateur bands lt 30 seconds lt 1 4 1 Specifications are subject to change in the interest of technical improvement without notice or obligation Specifications are guaranteed only within Amateur bands FT 920 Operating Manual Supplied Accessories Item Quantity MH 31 pg Hand Microphone ccccsscceeeeeneees 1 DC Cable fused for 25 AMPS ccccceeeeeteeeees 1 Spare 25 Amp FUSC cccceceeseeesesteeeeeeeeeeeaeees 1 Available Options MD 100asx Desk Top Microphone FM 1 FM Unit YF 116C 500 Hz CW Filter YF 116A 6 kHz AM Filter TCXO 7 High Stability Reference Oscillator Unit 2 ppm FP 1025A AC Power Supply Switching Regulator Type 25A USA only FP 1030A AC Power Supply Linear Type 25A YH 77STA Stereo Headphones SP 8 External Speaker w Audio Filters FL 7000 500 Watt Solid State HF Linear Amplifier VL 1000 1000 Watt Solid State HF 50 MHz Linear Amplifier E 767 Band Data T R Switching Cable for FL 7000 RCA Connector P N P0090544 2 Pin Miniature Plug 3 Pin Phone Plug 5 Pin DIN Plug FMi 4 YF 116A FP 10304 P N P0090034 P N P0090008 P N P0091006 lt E MD 100Agx F 146C TCRO FL 7000 FT 920 Operating Manual DC 13 5V 4 UP 3 DONN S5 amp FAST Ol A i GN O prt Oe lt i MIC GN
60. SK Amplifiers Yaesu FL 2100 Series or others The Tx Gmo jack on the rear panel of the transceiver provides for Tx Rx switching of non QSK amplifiers A schematic diagram of the FT 920 s internal relay circuit is shown below 13 5V RL2001 TX GND GBV 1 STV Z 18S agg I ie E 458 TH TR RY BAND DATA Switch o O2036 PY D201 lt 11ES1 As the FT 920 is supplied from the factory the inter nal relay is disabled and a high dissipation NPN transistor s open collector is connected to the Tx Gnn jack To enable the relay for use with amplifiers requiring it move the rear panel Tr Ry switch lo cated in the hole near the center of the rear panel to the Ry position Use a thin insulated object like a toothpick to move the switch Then connect the cen When using the nan GSK Amplifier RY position ANTENNA A FT 920 ter contact of the Tx Gnp RCA jack to the amplifier s relay control line using the outer contact of the Tx Gnn jack for the shield Connect the RF coaxial cable and if compatible the ALC cable as described in the QSK amplifier interconnection section above Refer to the drawing below for details With the relay enabled the FT 920 can support non QSK linear Tx Rx switching voltages of up to 220 VDC maximum permissible DC voltage at 270 mA 30 VDC at 2 A or 125 VAC maximum permissible AC voltage at 500 mA Caution Do not exceed the maximum ratings of the
61. TUN Function Enable Disable high speed antenna tun ing Available Values aini aF F Default af F The higher speed tuning option reduces the tuning time slightly for the ATU The SWR obtained at the completion of Fast tuning may be slightly higher than in the Normal mode but this should present no prob lems in typical operation FT 920 Operating Manual SSS ny U 73 TRAX ANT Function Enable Disable protection relay in line from RX ANTENNA jack Available Values 07 2 F Default 0 When the RX Antenna key is pressed activating the Receive only antenna port protection for the re ceiver circuits from high RF voltage is afforded by a small relay which in the default condition opens the RX Antenna line during transmission If only very low RF voltage is present in your installation during trans mission this Menu Item may be turned OFF FT 920 Operating Manual 83 84 Although the FT 920 does not have a dedicated Transverter jack per se the flexibility provided by the multiple antenna ports and the Menu system will generally provide easy interfacing to VHF and UHF transverters The recommended interconnection points are de scribed below O For transceive converters where both trans mit and receive converter circuits use a com mon RF input output line connect the coaxial cable from the transverter to the B antenna jack O For separate receive and transmit converter units conne
62. VFO B and that VFO B s frequency is 5 kHz higher than VFO Ass To cancel Quick Split repeat the first four steps above in step rotate the VFO B Tuning Dial to Orr then press Menu to exit the Menu mode and resume normal operation Mode K Satellite Operation Although the FT 920 is not designed for full duplex satellite operation Mode K satellite operation uplink on 21 2 MHz downlink on 29 4 MHz is nonetheless possible particularly on CW Here is a generalized example of such an operating scenario consult one of the many satellite operating journals for precise frequency information Set VFO A to 29 430 MHz CW mode and dis able temporarily at least the Narrow filter if currently on Be sure that the VFO A RX indi cator is illuminated Set VFO B to 21 230 kHz CW mode Press the VFO B TX key so that the switch LED glows Orange If you are using a typical triband or log peri odic antenna which covers both 15 and 10 meters set up the two VFOs for operation on the same antenna If you are using separate antennas on the two bands connect the 15 meter antenna to antenna port B and select Antenna B for VFO B now connect the 10 meter antenna to antenna port A and select antenna A for VFO A Press the Bk In switch to activate full CW break in operation If the appropriate satellite is above the hori zon and the frequency is clear you may now send a string of dots to allow you to find your
63. X system to provide hands free au tomatic change over from receive to transmit When the speech input from the microphone is detected by the VOX circuitry an internal PTT switch will be activated to begin transmission when speech input ceases the VOX circuitry will release the transceiver back to the receive mode Operation is quite simple Press the VOX switch Without pressing the PTT switch on the micro phone speak into the microphone at a normal voice level The FT 920 should automatically switch into the transmit mode and should return to receive when you quit talking To cancel VOX and return to PTT operation press the VOX switch once more The VOX system may require minor adjustment to optimize its parameters for your particular voice char acteristics These parameters are set via the Menu system as follows O If speaking in your normal voice level does not activate the transmitter or if background noise in the operating room trips the VOX the VOX sensitivity Vox Gain may be adjusted via Menu Item U 65 as described on page 81 O If the delay in returning to the receive mode is not suitable for your operating habits too quick or too slow the delay interval Vox DeLay may be adjusted via Menu Item U 64 as described on page 81 O To prevent the speaker audio from activating the VOX circuitry you may need to adjust the VOX Antitrip setting Use Menu Item U 66 described on page 82 to do this D
64. amp is on Not Used 4 Fine Tuning active Not Used 5 Not Used Linear Amplifier Tuning Pulse being transmitted 6 VFO B Tx Mute active DTMF Tone are being transmitted 7 VFO A Tx Mute active VOX is active 89 90 Read Meter F7H Sending this command with the parameters shown below causes a variety of transceiver metering data to be downloaded The values are within the range 0 and FFH and the data is returned in the following format Parameter Meter Meter Byte Byte Meter Byte Meter Byte Perse sro ac vou aw reo emo mev suet eren The dummy data above is meaningless and may be ignored 1 Byte Memory Channel Number Data Structure For Opcode 10H etc EA Memory Channel Data Hex Codes Freq Hz 88 5 HHE Hz 91 5 94 8 97 4 01h 67 0 OAh 100 0 103 5 107 2 110 9 05h 77 0 OEh 114 8 28h P1 only 14 Byte Frequency Data Record Structure The following tables outline the 14 byte data record structures used for the Operating Data VFO A VFO B and Memory Frequency data records Byte 14 Byte Data Record Assignment Band Selection Operating Frequency Clarifier Offset 2 Bytes see below Mode Data Flag Filter Data 1 Filter Data 2 CTCSS Encoder Data CTCSS Decoder Data Memory Recall Flag
65. an external PTT line if provided by your external keyer TNC or computer keying interface REAR KEYER SWITCH ON PDL KEY SWITCH KEY si DOT DASH COMMON KEY PTT GND KEYER SWITCH OFF PDL KEY SWITCH KEY AED FT 920 Operating Manual 5 Antenna Connections The FT 920 s three antenna connectors plus inno vative microprocessor based memory and switching circuits provide excellent flexibility in setting up your antenna connections Typical antenna configurations are shown below Re member that Antenna A and Antenna B which are SO 239 or M connectors may be used for trans mission and reception while the RX Antenna port which is an RCA type connector may only be used for reception Note Regarding Large Receive Antennas Although surge suppression is provided on all antenna ports you may wish to consider build ing a simple external circuit which will discon nect on TX any antenna connected to the RX Anr IN jack particularly if you are using a very long wire antenna such as a Beverage Very long antennas can build up very high RF and static voltages on them and the circuit below may provide better protection for your receiver s input circuitry HF Beam ANTENNA B ANTENNA 5 R 290e9 SOU0O He GC 13 5V 6 m Yagi 7 MHz Dipole 6 Personal Computer Interfacing for Contest Software etc The FT 920 features a built in lev
66. and typically only the 1750 Hz tone selection would be applicable for BURST operation FT 920 Operating Manual 77 78 U 37 Ti T F Function Set the desired repeater access Tx tone Available Values OFF Values per chart below 1750 Hz Default OFF Use this Menu Item to set the frequency of your en coding tone used for repeater access in the FM RPT mode U 38 Fu T F Function Set the desired Tone Decoder frequency for your receiver Available Values OFF Values per chart below Default OFF Use this Menu Item to set the frequency of your transceivers CTCSS Decoder if used The Decoder is activated by setting this Menu Item to any value other than OFF and your receiver will be silent on FM RPT until a matching tone is received superim posed on the carrier of an incoming signal U 39 CHE RFT Function Set the desired repeater shift magnitude for 29 MHz operation Available Values D ADDN kHz Default ILD kHz This Menu Item sets the 29 MHz shift separately from the 50 MHz shift U 40 WHE RPT Function Set the desired repeater shift magnitude for 50 MHz operation Available Values D SDDL kHz Default 5D kHz The default shift represents the standard value used in most of the United States CTCSS Tone Frequency Hz Pro ors Pore Pers isis res faer U 41 ANT SEL Function Define the operating function for the An TENNA A B RX switch Available Values Fut 0
67. ary Scanning Switch The optional MD 100A8X Desk Microphone fea tures a Rotary Scanning Switch at the base of the microphone support stand Rotating this switch to the left causes the frequency to scan lower and rotating the switch to the right causes the frequency to scan higher Rotating this switch fully to the left or right causes the scanning speed to switch to the Fast mode as though you had pushed the Fst switch on the MH 31B8 See the table below for a summary of the steps avail able in these modes of operation Fully Fully SSB CW DATA ssB 10Hz 110Hz 100Hz 100Hz AM FM DATA FM 100Hz 1100Hz 1kHz 1kHz Lock Switches To guard against accidental changes in the settings of the Tuning Dials and or the Shuttle Jog dial use the Lock functions provided on the front panel The Lock switches to the lower right of the VFO A and VFO B Tuning Dials have slightly different ef fects depending on how each switch is pressed These switches may be used in combination to pro vide the desired locking control as shown below Pel Lock A Switch Lock B Switch VFO A Tuning Dial 3 and Shuttle Jog VFO B Tuning Dial All Switches exp POWER MOX VOX Switches FT 920 Operating Manual 40 Operating Convenience Features Display Brightness Control The FT 920 is shipped from the factory with the dis play illumination set to its maximum level Should you wish to reduce the illumina
68. assigned to the band currently in use See the table below for a listing of the bands and their assigned memory locations for the CALL Channel function The Catt Channels are as signed memory locations C 01 through C 11 Next press and holdin the V gt M key for 1 2 second until you hear the double beep to lock the frequency into the chosen memory location You may now repeat this process for the other Catt Channels preferably assigning one such channel per band Note Channel C 10 already is programmed at the factory with the following frequency C 10 51 000 00MHz FM Recall of Catt Channel Memories Whether in VFO or Memory operation recall of Catt Channels is very easy Just press and hold in the Step key below and to the left of the VFO A Tuning Dial and press the Banp key on the keypad corresponding to the desired band For example to recall the 40 meter Catt Chan nel press and hold in Step then press the 7 MHz key while you are holding in Step To recall the 12 meter Catt Channel press and hold in Step and press 24 5 MHz Note If you are operating in the Memory Tune mode activating the Catt Channel system will cancel the Memory Tune function and place the transceiver directly into the Memory mode Since the Catt Channels are not segregated into an isolated memory band like the QMB memo ries you also may access these memories via the UPA and Down
69. ber to re evaluate your station s compliance with these regulations during portable operations such as Field Day or special event stations Note also that power output may be programmed to 50 Watts maximum via Menu Items U 49 and U 50 see page 79 for details Regarding electromagnetic compatibility if this trans ceiver is used with or in the vicinity of a computer or computer driven accessories you may need to ex periment with grounding and or Radio Frequency In terference RFI suppression devices such as fer rite cores to minimize interference to your commu nications caused by energy from the computer Com puter generated RFI is usually a result of inadequate shielding of the computer s cabinet or I O and pe ripheral connections While computer equipment may comply with RF emission standards this does not ensure that sensitive amateur radio receivers will not experience interference from the device Be certain to use only shielded cables for TNC to Transceiver connections You may need to install AC line filters on the power cord s of the suspected equipment and decoupling ferrite toroidal chokes may be required on interconnecting patch data cables As a last resort you can try installing additional shield ing within the computer s case using appropriate conductive mesh or conductive shielding tape Es pecially check RF holes where plastic is used for cabinet front panels For further information
70. ce 55 AFSK RTTY or Packet Operation 56 FSK RTTY Operation ossee 56 AM Transmission 57 Basic Operation eT FM Operation iniinda Nanaia 58 Simplex Non Repeater Operation 58 Repeater Operation ie Memory Operation ccecceceseeceeeeeeeeteeeeeeeeneeeeeneeaees QMB Channel Programming Recall s es 59 Memory Operation on Regular Memory Channels Channel 1 01 to 1 99 nesses 60 Memory Operation on Split Frequency Channels Channel d 01 to 0 10 nesese 62 Memory Operation on CALL Channels Channel C 01 to C 11 oo eeeeeceeeeeeeereeereeeeeeees 63 Adding Alpha Numeric Labels to Memory Channels 64 Memory Mode Accessories s s s 65 Moving Memory Data to VFO A 65 Deleting Data from a Memory Channel 65 Scanning Operation ee 66 Scanning Operation sssr 66 Scan Skip Programming Memory Mode Only 66 Programmable Memory Scan PMS Operation 66 Scan Resume Choices eceeeseeeeeseeeeeeeeeeees 67 Dual Watch Operation 68 Menu Operation 69 Normal Menu Operation 69 Panel Menu Operation ssec 70 Quick Menu Operation s s s 70 Menu Mode Selections and Settings 5 VHF UHF Transverter Operation cee Phone Pacth Operation cceeeeseeeeeeeeteeeeeeeeeeeees CAT Computer Aided Transceiver System Protocol CAT Data Protocol ce
71. ce cece eeeeeeeeneeeeeeeees Constructing Sending CAT Commands 00 Downloading FT 920 Data A 14 Byte Frequency Data Record Structure Memory Backup cc ccc ce eens ceeeeeeeeeeeeeeeeeeteaeenaes Microprocessor Resetting wi Installation of Optional Accessories 0 005 Bottom Case Removal ccccecceeceeseeeteeeeeeeeenetens Installation of Optional Filters YF 116C YF 116A Installation of High Stability Oscillator TCXO 7 Installation of FM Unit FM 1 eseese Congratulations on the purchase of your Yaesu FT 920 Whether this is your first rig or if Yaesu equipment is already the backbone of your amateur radio station it is our sincere hope that you will derive many years of operating enjoyment from your new transceiver The FT 920 is a state of the art amateur transceiver incorporating a multitude of advanced features to give you the competitive edge in a wide variety of operating applications The FT 920 offers up to 100 Watts of adjustable power output on all amateur bands between 160 meters and 6 meters 25 Watts carrier in the AM mode utilizing rugged low distortion MOS FET final amplifier transistors Operation in the SSB CW AM AFSK and FSK modes is built in and an FM module is available as an option Yaesu s renowned Omni Glow LCD display provides a wealth of information regarding transceiver status and it includes enhanced tuning aids for many operating
72. ceiver and do not drop sharp metallic objects into the transceiver en closure Electrical shock may result when you attempt to remove the object Unsupervised children should be kept away from any electrical apparatus such as the FT 920 transceiver and its accessories 4 Antenna Precautions Always install antennas such that they can never come in contact with outdoor power lines in the event of a catastrophic antenna support or power line sup port structure failure An adequate safety margin is usually provided by separating power lines from the antenna and its support structure 1 5 times the height of the support plus the length of any antenna or guy wires attached to the support plus the height of the power line support pole Ground the antenna support structure adequately so as to dissipate energy absorbed during a lightning strike Install appropriate lightning arrestors in the antenna lead in and rotator cable if used according to the arrestor s instructions In the event of an approaching electrical storm dis connect all antenna lead in rotator control and power cables completely from the station but only if the storm is not immediately in your area Do not al low disconnected cables to touch the case of your FT 920 transceiver or accessories as lightning can easily jump from the cable to the circuitry of your trans ceiver via the case causing irreparable damage If a lightning storm s in progress in your
73. ception s e 42 Dealing with Interference 3 SHIFT Control ecceecceceeeeeeeeeeeeeeeeseeeeeeeeeeeeeeee HicH Cut Low Cut Controls DSP eee 43 Notch Filter DSP on RF Gan Control seit cecnventen evlraviosavend IF Noise Blanker NB e eeeeeeeeeeeeeeee 44 DSP Noise Reduction NR esses 44 Tools for Strong Signal andLow Frequency Operation 0 IPO Intercept Point Optimization te ATT Front End Attenuator eseese Digital Voice Recorder Operation DVR 46 Transmitting ssnin aeaiiai pisinisi iiaii 47 Automatic Antenna Matching ot SSB Transmission cc cccccecceceeeeeeeeeeeeeeeeseeeeees 49 Basic Operation ecceceseeceeeeeeseeeeeeeeeeeeeeeees 49 VOX Operation a Digital Speech Processor Operation 49 DSP Voice Pattern Contours 0 0 0 cee eee 50 Voice Monitor Operation s es 50 Digital Voice Recorder Operation Transmit 50 Linear Amplifier TUNING 0 eee ee eect eeeee ree eeeeeeee 51 CW Transmission s Straight Key Operation ceeeeeeeeeeees 51 Electronic Keyer Operation seee 52 Memory Keyer Operation ceeeee 52 Tips for Successful CW Memory Keyer Operation 53 Split Frequency Operation ccceceeeeeeeeeeeeee 54 TX Cuarifier Operation n 53 Split VFO Operation 54 Quick Split Feature 54 Mode K Satellite Operation 55 Digital Mode Operation ce
74. con is illuminated when the DSP Noise Reduc tion circuitry is active FT 920 Operating Manual 31 18 17 18 BC 13 5V ii T W Hi I i Y i N Ni M c in Hi Hi i i i testi M y i j i 10 AVAWAWAVAVAVLWAVAVAVAY N fi i l i i o_o O20 obo 020 020 WV N i KN iN t 0 ap i i i N 4 i A N 1 Bano Connector This 8 pin interlocked DIN connector includes Tx Rx switching and bandswitching control lines for use with the Yaesu Model FL 7000 Linear Amplifier 2 CAT Port This DB 9 connector is used for interconnection to a personal computer s serial port to enable computer assisted operation Use a standard not null modem RS 232C serial data cable 3 Key Jack This jack may be used for connection to a straight key an external electronic keyer a computer driven CW keying interface or a keyer paddle 4 Pot Key Switch This switch changes the function of the rear panel Key jack When the Po Key switch is set to the Pot posi tion the rear panel Key jack will be connected in par allel with the front panel Key jack when the PpL Key switch is set to Key the rear panel Key jack will be changed so as to accept a straight key external elec tronic k
75. ct the transmit converter s coaxial cable to the B antenna jack and the receive converter s coaxial cable to the Rx Ant In RCA jack on the rear panel of the FT 920 o o Select Antenna B by pressing the ANTENNA A B switch if needed Press VFO A s Orange Tx LED Switch for 1 2 second to activate the TX Mute mode which provides a maximum power output of 10 Watts Now rotate the RF Pwr control fully counter clockwise At this setting power output will be essentially zero and you may then adjust the RF Pwr control slightly clockwise so as to Important Note Even though you might mis takenly assign a different band to Antenna B or forget to turn the RF Pwr control fully counter clockwise the maximum power which will appear at the Antenna B port will be 10 watts If you design an input protection attenu ator network correctly you should easily be able to provide fail safe protection for your VHF UHF transverter FT 920 Operating Manual Overview Phone patch operation allows linking your FT 920 to the public telephone system to provide two way sim plex communications on behalf of third parties The FT 920 may be used with the LL 7 phone patch unit installed in the optional SP 8 external loudspeaker or with phone patch units from other manufacturers The diagram at the bottom of the page shows inter connection for the SP 8 LL 7 combination be sure to consult the documentation provided with u
76. d DC Cable FT 920 Operating Manual 18 4 CW Key Paddle and Computer Keying Interface Suggestions Features The FT 920 includes a host of features for the CW operator the functions of which will be detailed in the Operation section later These include A built in electronic keyer with message memory A front panel Key jack for connection of a keyer paddle and Arear panel Key jack which may be connected to another keyer paddle ora straight key TNC or computer CW keying interface for use with contest software etc Both Key jacks on the FT 920 utilize positive key ing voltage Key up voltage is approximately 5V DC and key down current is approximately 0 5 mA When connecting a key or other device to the Key jacks use only a 3 pin stereo phone plug a 2 pin plug will place a short between the ring and grounded shaft of the plug resulting in a constant key down condition in some circumstances COMMON COMMON FRONT KEYER SWITCH GN DOT DASH COMMON KEYER SWITCH OFF i KEY KEY GND KEY KEY KEYER SWITCH ON PBL KEY SWITCH PDL KEYER SWITCH OFF PBL KEY SWITCH PDL i GND KEY PTT GND Configuration Suggestions For everyday operation using the internal elec tronic memory keyer connect your paddle to the front panel Key jack and activate the front panel Kever switch If you wish to keep the keyer paddle s cable
77. d items accessed by pressing the Menu key after ac tivation via Menu Item U 67 When Quick Menu has been activated Normal Menu operation is activated by pressing and holding in the Menu key for 1 2 second Here are operating procedure summaries for each Menu mode Normal Menu Operation Press the Menu key once momentarily The Menu Item number will start blinking and a brief title for the Memory Item will appear at the far right side of the display Rotate the VFO B Tuning Dialto select the Menu Item you wish to work on When you have chosen the desired Menu Item number press Ent on the keypad momentarily The current value or condition for the Menu Item chosen will be shown in the main frequency dis play area Again rotate the VFO B Tuning Dial or press the front panel UPA or Down Y keys to change the value or condition for the Menu Item When you have made your selection press ENT to lock in your setting You may now select an other Menu Item number to work on by rotating the VFO B Tuning Dial or press Menu to exit and resume normal operation Panel Menu Operation Five more frequently used Menu Items have been ihiihi Ee l COAMA ume WIA et eee DL I di tk i VEG I Current Value Menu Item Number Menu Title FT 920 Operating Manual 69 70 stored in a special Menu Bank which allows you to recall them quickly by pressing and holding in the Step key while press
78. degree of impedance transforma tion which may occur in your feedline if the feedpoint impedance is not very close to the coaxial cable s 50 Q impedance Note that the FT 920 s automatic antenna tuner is not designed to cope with the wide variations in im pedance presented by a random length long wire antenna unless you take specific steps to match the impedance at all frequencies of interest To use the FT 920 s automatic antenna tuner Turn the RF Pwr control fully clockwise the transceiver will automatically reduce its power to a maximum of 50 Watts during antenna tun ing Check to be certain that the frequency is clear before initiating antenna tuning Press and hold in the Tuner switch for 2 sec ond to activate the tuner The RX Tuner TX indicator will appear on the display A carrier will now be transmitted by the FT 920 The automatic antenna tuner will now adjust itself so as to present a low SWR to the final amplifier stage The Wart indicator will appear on the display during tuning When tuning is completed the Wart indica tor will disappear and the FT 920 will revert to the receive mode At this point if the tuner achieved an SWR of less than 1 5 1 the tuner settings will be stored by the tuner s memory system these settings will be used the next time operation takes place on this frequency If the tuner was not able to achieve an SWR of 1 5 1 or lower typically only when t
79. des a me chanical closure to Ground on Transmit while the NPN transis tor switch sinks its open collector to ground on 25 Watts maximum Positive DC Voltage Only 50 V max at500 mA FT 920 Operating Manual transmit Check with the manufacturer of your ampli fier or other device to confirm the switching voltage and current if it is not clearly stipulated in the docu mentation for your equipment Be absolutely certain to check the position of the Tr Ry switch prior to connecting any external de vice to the Tx Gnn jack Never connect an AC voltage or a negative DC voltage to the Tx Gnp jack if the TR Ry switch is set to TR The Limited Warranty on this product does not cover damage caused by improper connections excessive or im proper voltage to the rear panel jacks of the FT 920 8 13 5V Jack This jack provides 13 5V DC at up to 200 mA for use with low power peripheral devices The jack is fused and the current is limited by the size of the copper foil on the internal circuit boards do not ex ceed the 200 mA current limitation 9 Ext Sp Jack This 3 5 mm 2 pin jack provides speaker audio out put for an external speaker The audio output im pedance at this jack is 4 Q 16 Q and the level varies according to the setting of the front panel s AF GAIN Control 10 Ar Out Jack This is a fixed level audio output jack for connection to a peripheral device such as a TNC Morse code read
80. duced manu ally lambic keying with Automatic Character Spacing enabled This selection is best when programming message memories U 21 GOTSTZE t the Dot Space ratio for the built in elec Function Set tronic keyer Available Values fi i 0 1 12 7 1 Dot Space ratio Default if corresponds to 1 1 Dot Space ratio Use this Menu item to set the Dot weighting for the internal keyer It is not recommended that you ex ceed a value of cit for this setting FT 920 Operating Manual 75 U 22 GSHETZE Function Set the Dash Space ratio for the built in electronic keyer Available Values fi iZ 0 1 12 7 1 Dash Space ratio Default 3i corresponding to 3 1 Dash Space ratio Note that the Dot Space Dash ratio using the default values is a perfect 1 1 3 U 23 Sh TLY Function Provide an envelope delay when using the internal keyer Available Values ft ii Default 5 ms This Menu Item allows shifting of the entire CW trans mission string in time so as to avoid sequencing dif ficulties with external linear amplifiers etc The de lay is applied to the entire keyed signal no truncation on either make or break to preserve the full val ues of weighting set via Menu Items U 21 and U 22 ms U 24 HOR ILH Function Set the pseudo VOX hang time for trans mission during semi break in CW Available Values fii 5 iff Seconds Default Increasing this value somewhat
81. e 14 key to change VFO A to the 14 MHz band Initially the operating frequency will be 14 000 00 MHz rotate the VFO A Tuning Knob to move around in the band Press the CW key to set the operating mode to CW Now press the 10 key observe that the frequency is set to 10 000 00 MHz and the mode is set to AM Now press the 7 key and observe that the mode has changed to LSB the mode originally chosen on the 7 MHz band Press the 14 key and observe that the mode has similarly reverted to CW the last mode used on the 14 MHz band VFO B Band Selection By pressing and holding in the Keypad s Gen CE key for Ye second frequency command control will be shifted from the VFO A register to the VFO B reg ister For example to set VFO B to the 21 MHz band press and hold in the Gen CE key for 1 2 second you will observe that the VFO B frequency display area will blink Within five seconds press the Keypad s 21 key After pressing the Gen CE key for 2 second you may also change the mode of operation and or the antenna to be used if you like Note that pressing the Gen CE key for 12 second does not itself choose VFO B to be the receiv ing or transmitting VFO register This action acts as a scratchpad function which allows VFO B to be set on the frequency mode and antenna to be used when VFO B is next activated FT 920 Operating Manual 38 Direct Keypad Frequency Entry VFO A Direct Frequency Ent
82. e When you reach the set ting of the Mic Gain control which causes the power output indication to increase slightly on voice peaks reduce the setting of the Mic Gain control slightly this will be the point of best audio quality The PO meter will fluctuate significantly for an instant at the start of a transmission this is not abnormal However if the ALC meter fluctu ates significantly on voice peaks the Mic Gain control may be set too high and your trans mitted signal quality may be degraded Reduce the setting of the Mic Gain control if this is ob served The DSP VOX and Monitor features are opera tional during AM transmission See page 50 for a description of the DSP Voice Pattern Contours and page 49 for details regarding VOX operation Monitor operation is discussed on page 50 For low power operation reduce the setting of the RF Pwr control FM Operation Optional FM 1 Unit Required FM operation is permitted only in the 29 and 50 MHz bands due to bandwidth limitations Be careful while operating in the 29 MHz band to operate only in the FM sub band above 29 5 MHz so as to avoid harm ful interference to satellite operations below 29 5 MHz Simplex Non Repeater Operation Connect the microphone to the Mic jack Set the Mope switch to FM and the RF Pwr control fully clockwise Close the microphone s PTT switch to activate the transmitter Speak into the microphone in a nor mal voice level Th
83. e 15 VDC 100 mA limitation for transistor switching described previously connect the Tx Rx switching line for the linear to Pin 2 of the Bann jack and use Pin 3 for the shield of the cable If the ampli fier provides a closure to ground to confirm that its relays are properly seated this exciter enable line may be connected to Pin 8 of the Bano jack The Bann jack is a specialized interlocked 8 pin DIN connector When a suitable plug Yaesu Part P0090160 is inserted into the Bano jack it opens the interlock which in the case of the FT 920 grounds Pin 8 If no exciter enable line is provided by your amplifier connect a jumper between Pin 8 and Pin 3 Ground if you do not the FT 920 will not allow it self to transmit If your QSK amplifier requires the exciter s control circuits to switch more than 100 mA or uses more than 15 VDC for Tx Rx relay switching you will have to provide a suitable external interface transistor con trolled by Pin 2 of the Bann jack LF H aoO ANTENNA B ANTENNA A j Bi FT 920 e a T CARIF R P N T 101256 Suppliad with FL 7000 gd g oO o amp GND BAND Cha TA Optional Cable C 1 11 DC CABLE Supplied with FT 9205 FT 920 Operating Manual Interconnection with non Q
84. e Ratio 0 0 1 127 12 7 1 30 3 1 Keyer Envelope Delay 0 30 ms 5 ms Se mi Break in PTT Hold Time 0 5100 ms 5 1 seconds 0 ms 0000 Contest Number 0000 9999 Contest Number 0 Format 0 Zero T O Oh 0 Zero Contest Number 1 Format 1 A Contest Number 2 Format 2 U Contest Number 3 Format 3 V Contest Number 5 Format 5 E Contest Number 7 Format 7 B Contest Number 8 Format 8 D Contest Number 9 Format 9 N Contest Number Size Format No Leading 0 nnn nnnn O ff No Leading 0 u 35 HF Repeater Tone Type CTCS S Burst CTCSS u36 VHF Repeater Tone Type CTCS S Burst CTCSS FT 920 Operating Manual 71 72 Menu Mode Summary Chart FT 920 Operating Manual Sa k ol k U 01 ITAL 4 Function VFO A VFO B Tuning Dial Speed Available Values Default i You may choose Sonora two speeds for the tuning dials Selecting cuts the tuning rate in half com pared to the default value U 02 UP IN Function ae Switch Steps front panel Available Values f 5 iif kHz Step Default ii kHz Step The default value is ideal for quick navigation from one end of a band to the other For quick tuning around within a band segment a value like 1 kHz may be preferable U 03 STEPSET Function Step Switch Function Available Values Lal na Lal Default al The Lat Lock position allows toggling of the Fast gt Fine gt Normal tuning rate I
85. e VFO or memory register in use Therefore once you have set the transceiver up on each band of interest you will not have to se lect the antenna manually unless you want to change it when you change bands or memories the most recent setting will be retained Mode Selection Press one of the Mode switches located immedi ately to the left of the VFO A Tuning Dial to select the operating mode The avail able choices are SSB CW AM FM and Data The SSB switch is a toggle function which allows the op erator to choose between USB used by convention above 10 MHz and LSB used below 10 MHz Press the SSB switch as nec essary to choose the appropriate SSB mode as we proceed with exploration of different bands The CW switch uses a toggle function to select be tween USB and LSB side injection a k a CW Re verse Although the default USB side injection is typically used you may wish to elect LSB side injec tion below 10 MHz particularly if you anticipate switch ing between LSB voice and CW frequently eee FT 920 Operating Manual Special Note for CW Mode Reverse CW Sideband When you switch modes between CW and USB you will observe that the frequency of the re ceived signal stays the same even though the displayed frequency may change slightly You will also observe that the pitch of the received signal decreases as you increase the frequency by rotating the Tuning Dial However
86. e images charts and forecasts Popular Shotwave Broadcast Bands Meter Frequency Range Band MHz 0 150 0 285 3 9 35 9 90 0 520 1 625 2 11 55 12 05 5 13 45 5 85 6 20 21 45 21 85 7 10 7 50 11 25 67 26 10 Dealing with Interference Snirt Control The front panel s Suirt control tunes the position of the IF passband relative to the frequency of the in coming signal in all modes except FM This allows the operator to sweep in effect the current IF filter back and forth across the desired signal eliminating interference in the process without changing the pitch of the incoming signal The control is detented in the center 12 o clock po sition which represents the normal passband cen ter frequency The Suirt control is dedicated to the receive mode and does not affect your transmitted signal characteristics such adjustment of the trans mitted signal is however provided via Menu Items U 59 U 60 U 62 and U 63 Rotate the Suirt control to the left or right to eliminate the interference Careful adjustment of the SHiFt con trol may also be useful in improving the recovered audio on excessively bassy SSB signals Return the SHIFT control to the center detented position to return to the normal default passband setting HicgH Cut Low Cur Controls DSP The DSP system s chief interference fighting circuitry is the passband tuning feature which features the HicH Cut and Low Cut controls These
87. e memory and return to VFO operation As a convenience during Memory operation once you have recalled a channel within the Split Memory Bank channel d 10 d 10 you may press the Mem Group key to restrict memory access only to the Split Memory Bank Press the Mem Group key again to restore free memory channel access Memory Operation on Cat Channels FT 920 Operating Manual Channel C 01 to C 11 The Cat channels are easy access memories which may serve as convenient starting points for operation Many operators use them for quick recall of favorite frequencies in each band There is no requirement that you assign one fre quency per band However the Catt Channel fea ture includes a simple method of recalling these spe cial memories described later which involves the pressing of one of the Bano keys Therefore the procedure for storing memories band by band will be described below for illustrative purposes Storing Data in Catt Channels While operating on VFO A select the favorite fre quency you wish to have stored as your Cat frequency on the current band Press the V gt M key once momentarily the M CK indicator will blink and the frequency store in the current memory channel will be shown in the VFO B display area Now press either the UPA or Down key or use the VFO B Tuning Dial by pressing the Mem Cu key first to select the Cat Channel memory
88. e microphone gain level is set automatically in the FM mode and is not affected by the Mic Gain control s setting Release the PTT switch to return to the receive mode The VOX and Monitor features are operational during FM transmission See page 49 for details regarding VOX operation Monitor operation is dis cussed on page 50 Repeater Operation The FT 920 may also be used in the FM mode for repeater operation Several convenient features make FM repeater operation simple and efficient While operating in the FM mode on the 29 or 50 MHz bands press the front panel RPT key to ac tivate repeater operation Pressing the RPT key causes two important functions to become activated O The transmitter frequency will be shifted by a default value 100 kHz on 29 MHz 500 kHz on 50 MHz so as to access the repeater input frequency O A repeater access tone will be superimposed on your signal as many repeaters on these bands use CTCSS to prevent false activation of the repeater by random noise Both Subaudible CTCSS and Burst 1750 Hz tones are available If the above repeater shifts and or access tone are not appropriate for your area they may be set inde pendently for each band The Menu items which pertain to these functions are shown below O To set the 29 MHz CTCSS Tone Mode CTCSS Burst use Menu Item U 35 see page 77 FT 920 Operating Manual 57 O To set the 50 MHz CTCSS Tone Mode CTCSS B
89. e multiple notch filters to eliminate them To activate the DSP Notch Filter press the Notcu key To turn the filter off press the Notcu key once more Note The DSP Notch filter should not be used in the CW mode The DSP system will interpret a CW car rier as being interference and will notch out the in coming signal Therefore as you tune the band with the Notch Filter on CW signals will appear for a mo ment then disappear as they are notched out RF Gain Control The RF Gain control is a highly useful interference fighting control that is often overlooked When interference or background noise are severe rotating the RF Gain control counter clockwise may in some instances improve reception Counter clock wise rotation of the RF Gain control reduces the gain in the RF and IF stages by applying an increasing amount of AGC voltage this causes the background noise and signal levels to decrease and it also causes the no signal indication of the S meter to rise Sig nals weaker than the minimum S meter indication may still be plainly audible but they will no longer be affecting the AGC system This may be exploited by the skillful operator par ticularly with regard to the DSP system Because the DSP operates in the audio section of the receiver after AGC detection is accomplished rotating the RF Gain control counter clockwise may reduce the detri mental effects of strong noise and interfering signals
90. e not connected Pin 1 of the Data jack to an AFSK out put line from your TNC use only the FSK line provided by your TNC If the FSK line has been properly connected check to be sure that you have the FSK mode properly enabled on your TNC if the software requires you to do so O If you are having trouble decoding HF packet sta tions be sure that you have set Menu U 46 to one of the settings which ends with U instead of L and that you have chosen a tone frequency compatible with the tones for which your TNC is configured FT 920 Operating Manual AM Transmission Optional YF 116A AM Filter Required The FT 920 utilizes low level modulation on AM and the DSP system may be used to enhance your trans mitted audio quality Remember that AM consists of the carrier signal plus two sidebands Because the available power output is 100 Watts total the carrier power should be lim ited to 25 Watts so as to have power available for the modulation sidebands which carry your voice sig nal Basic Operation Connect your microphone to the Mic jack Set the following controls as described below Mope AM Meter SELect ALC The ALC indicator will appear on the display Mic Gain Fully Counter clockwise RF Pwr Fully Clockwise Press the microphone s PTT switch The Trans mit indicator on the display will become illuminated Rotate the Mic Gain control clockwise while speak ing into the microphon
91. e of 13 5 V 10 Caution Serious damage can result if improper supply voltage is applied to this transceiver Your Limited Warranty does not cover damage caused by the application of AC reversed polarity DC or DC outside the speci If you wish to use a power supply other than one of Yaesu manufacture you must make certain that any DC supply connector to the transceiver matches the FT 920 requirements See the DC connector pinout on the previous page Other manufacturers have power supplies with a physically matched con nector that is wired differently this may cause serious damage to the FT 920 FT 920 Operating Manual ANTENNA B ANTENNA A FP 1030A Supplied DC Cable TI ri co N ANTENNA B ANTENNA A AC POWER SUPPLY men sss 9000000 aeoo OOOOO00O a OOO0000 5 ko OOO0000 9 o0 o AWS SSS Va rot S RED BLACK j Ch LI a a gt Tiem Q FUSE 254 mM 3 Ey 2 T N Supplied DC Cable y eee FT 920 Operating Manual Transceiver Location To ensure long life of the transceiver s components be certain to provide adequate ventilation around the cabinet of the FT 920 The cooling system of the transceiver must be free to draw cool a
92. eard The double beep provides audible confirmation that the memory storage was successful As you dial up other frequencies in the VFO mode repeating the procedure in above causes the QMB memory system to cycle through the QMB chan nels in the following sequence C 1 gt C 2 gt C 3 gt C 4 gt C 5 gt C 1 gt C 2 gt Frequency data will be stored and purged ona first in first out basis QMB Channel Recall Press the QMB RCL key to recall the currently active QMB channel The QMB indicator on the display will become illuminated Press the QMB RCL key repeatedly to cycle ough the QMB channels in the same sequence as shown for QMB Channel Storage While operating in the QMB Channel Recall mode you are not fixed on the QMB channel you may tune away from the QMB channel frequency us ing the Main Tuning Dial as though you were in the VFO mode In this situation the QMB indi cator will be replaced by one which indicates M TUNE To return to the originally stored QMB channel press the QMB RCL key once M Memory Operation on Regular Memory Channels FT 920 Operating Manual 60 Channel 1 01 to 1 99 Memory Channel Storage While using VFO A tune in the desired frequency on the Main Tuning Dial Set the operating mode bandwidth Clarifier mode and offset and Antenna A or B as desired If using the Automatic An tenna Tuner you may wish to touch up its align
93. ect and or adjust the settings for the alternate 7 MHz register for VFO B Frequency Navigation Once you have made an initial setting on a band us ing the one touch band keys or direct frequency en try you may tune around the band in search of sig nals Several tuning methods are available depending on which VFO is in use J For VFO A frequencies VFO A Tuning Dial Shuttle Jog Front Panel Up Down Switches Microphone Up Down Switches J For VFO B frequencies VFO B Tuning Dial FT 920 Operating Manual VFO Tuning Dial Rotating either VFO Tuning Dial tunes the transceiver according to the selected tuning step size Due to the extremely fine steps synthesized by the Direct Digital Synthesis DDS circuitry the tuning action is as smooth as though an analog tuning VFO were being used By pushing the Step key the tuning rate may be modified The Step key toggles between three set tings FineE gt NormMAL gt FAst gt Fine The steps available in each mode are shown below STEP Switch NO RMAL FAST FINE The Step switch affects the action of the VFO A and VFO B tuning dials as well as the front panel and microphone Up and Down switches Finally the number of tuning steps per revolution of the tuning dials may be changed via Menu Item U 01 see page 73 for details Shuttle Jog VFO A The Shuttle Jog is an efficient way to achieve large frequency excursions avoiding the
94. ed O In the QMB mode the scanner will scan only the QMB memory bank O Inthe regular Memory mode the scanner will scan the programmed memories and can be instructed to skip certain memories during scanning O In the regular Memory mode with Group Memory activated the scanner will scan only the memories within the current group and O In the Programmable Memory Scan PMS mode the scanner will scan the band within user programmed frequency limits Scanning operation is easy to perform Set the SQL Squelch control to the point where background noise is silenced A typical setting for effective scanning operation will be at 12 o clock or slightly clockwise from this position Set the transceiver into the operating configura tion in which you wish to scan VFO Memory QMB etc Press and hold in either the Up or Down switch on the microphone to initiate scanning On the MD 100A8X rotate the scanning ring to the left for downward scan or to the right for upward scan Note lf you are scanning in the VFO mode note that complete rotation of the scanning ring to the end of its travel will place the radio in a fast scan mode which may aid you in navigating quickly across a band The scanner will now cause the transceiver to in crement in the chosen direction until a signal is detected When a signal is encountered which opens the Squelch the scanner will pause until the sig
95. ed on the display panel 30 Shuttle Jog Control The outer concentric Shuttle Jog control behind the VFO A Tuning Dial allows fine or rapid frequency ex cursions with just a slight turn of your hand Rotating the Jog ring slightly to the left or right initiates slow tuning in a downward or upward direction respec tively The more you rotate the spring loaded Jog dial the faster the VFO will tune The tuning rate of the Shuttle Jog may be programmed via the Menu sys tem TXIRX Switching Relay O TX Circuit Antenna Tuner ee RX Bypass Switch Menu No U 48 s ANTENNA RX Switch T bE 23 32 33 34 35 42 41 36 37 38 39 40 46 47 yy 7 SHIFT N F TUNER sll Cy li N A j IO 7AN HF SOMH TRANSC IVER 7 PX vo 3 1kK_ aa Laxe Ly a ow vemm BAND LE et SN m Ke E5 Aii oF 3 Bpa al ta al imus J 245 ae STJ wa wa WN up MEN A OLANE HEET HIGIN KEVE SPERII PEN PPSD I U U UO O Q Cala i oe ee ee Y i ii e a 31 44 45 49 48 43 31 Lock Switch A The Lock switch locks the settings of the VFO A Tuning Dial and or the Shuttle Jog Press this switch momentarily to lock the Tuning Dial press and
96. el converter allow ing direct connection from the rear panel CAT jack to the serial port of your computer without the need for any external converter box When your software requests serial port configura tion information set it for 4800 N 8 2 4800 baud No Parity 8 Data Bits and 2 Stop Bits Be certain to configure and activate any required TSR Terminate and Stay Resident utilities before beginning com puter controlled transceiver operation your software s instruction manual will describe any such require ment HF Tribander ANTENNA 5 Ca DC 13 5V ul GND FT 920 Operating Manual 19 9 8 10 15 16 f J l 7 ar S YAESU meler N oo o ae a ae scH FS aT sfe 7 s D _ ED ANT INNA 88 MIC GAIN AF GAIN jue a C Ge A AA RF PWR RF GAIN AGE awe T AN N QO J ue TA aN A t H ey StL Cove pko GIN MANI LEVEL NE ae aa ye 5 a lan A A NA a eT RS IL 11 12 13 14 1 Power Switch This latching type switch turns the FT 920 on and off Push it once to turn the transceiver on and press it again to turn the power off 2 MOX Switch This also is a latching type switch used to switch the FT 920 manually into the transmit mode instead of using the microphone Push To Talk PTT switch for example Press
97. en into the ground If multiple ground rods are used they should be po sitioned in a V configuration and bonded together at the apex of the V which is nearest the station location Use a heavy braided cable such as the discarded shield from type RG 213 coaxial cable and strong cable clamps to secure the braided cable s to the ground rods Be sure to weatherproof the con nections to ensure many years of reliable service Use the same type of heavy braided cable for the connections to the station ground bus described below Inside the station a common ground bus consisting of a copper pipe of at least 25 mm 1 diameter should be used An alternative station ground bus may consist of a wide copper plate single sided cir cuit board material is ideal secured to the bottom of the operating desk Grounding connections from in dividual devices such as transceivers power supplies and data communications devices TNCs etc should be made directly to the ground bus using a heavy braided cable Please note that some types of external power sup plies not of Yaesu manufacture while otherwise being suitable for use with the FT 920 may be de signed such that the Negative black DC output ter minal is floating not connected directly to ground This may cause erratic operation especially when transmitting due to the potential for ground loops to form between your antenna system your station ground and
98. er or WeatherFax decoder The audio output level provided is 100 mV at 600 Q and the front panel AF Gain control has no effect upon the audio level present at the Ar Out jack 11 Patcu Jack This RCA jack is wired in parallel with the front panel s microphone input jack providing a convenient input port for connection of a phone patch or other audio input The audio input impedance is 600 and the signal applied to the Patcu jack is affected by the setting of the front panel s Mic Gain control 12 AFSK FSK Switch This switch determines the method of transmit Data input to Pin 1 of the Data jack described below If AFSK is selected then Pin 1 should be connected to the TX Audio line from the TNC If FSK is selected then Pin 1 should be connected to the FSK Out line from the TNC or TU 13 Data Jack This five pin DIN jack accepts AFSK input or FSK closure to ground input from a Terminal Node Con troller TNC or Terminal Unit TU it also provides fixed level Audio Output PTT and Ground lines The optimum AFSK Input level is 30 mV at 3 kQ while the Audio Output level provided is fixed at 100 mV at 600 Q 14 Ext ALC Jack This RCA type connector may be used for connec tion to a linear amplifier s ALC cable The specified control voltage range is OV 4V DC with 4V corre sponding to the maximum degree of power reduc tion being applied to the FT 920 15 RX Ant Jacks These RCA connecto
99. erference that may cause undesirable operation of the device YAESU leading the way Copyright 1997 Yaesu Musen Co Ltd All rights reserved No portion of this manual may be reproduced without the permission of Yaesu Musen Co Ltd
100. ero beat and its sideband USB LSB can be set via Menu U 42 Do not connect Pin 1 of the Data jack to any TNC TU line which carries Mic Aupio or Tx Aupio as these lines are used for AFSK operation see previous section Press the front panel Data key to select the Data LSB mode which corresponds to FSK opera tion remember Data USB is used for AFSK operation At this point you are ready to utilize your TNC TU s software to begin operation After loading the software tune in an RTTY station so that it is prop erly decoded on your computer screen or TU dis play When solid copy is obtained you may press the appropriate key on your computer s keyboard to activate the transmitter and begin typing See your TNC TU instruction manual for further de tails regarding actual operation As with AFSK operation the CW filter may be engaged in the FSK mode by pressing the Nar row key and the DSP filters may also be used to reduce interference in crowded digital operating situations Operating Tips O If you are hearing and decoding stations success fully in an AFSK environment but stations cannot understand you check to be certain that your TNC s software has not set a shift other than 170 Hz and be sure that the tones have not been in verted in the software configuration O If you are getting no shift only a steady carrier in RTTY FSK operation be sure that you hav
101. ese keys allows quick frequency jumps during VFO operation or memory channel selec tion during Memory Recall operation Pressing ei ther of these switches once momentarily causes the frequency or memory channel number to move upward or downward by one increment pressing and holding a switch in causes continuous frequency or channel number change The increments for frequency change during VFO operation using these switches are shown below STEP SWITCH POSITION 46 RX VFO B Indicator Switch This combination LED Switch indicates the operat ing status of VFO B in the receive mode The LED appears green when the receiver is set up for the use of VFO B This LED is also a switch when the receiver is using VFO B pressing the green LED will cause the re ceiver to be muted the LED will now blink Press the LED again to cancel the mute function 47 TX VFO B Indicator Switch This combination LED Switch indicates whether or not VFO B is being used to determine the transmit frequency The LED appears orange when the trans mitter is being controlled by VFO B this is a typical situation for Split operation using VFO B for trans mission while receiving on VFO A When the corresponding LED near the tuning dial for VFO A is pushed the VFO B TX LED will go out showing that VFO B has relinquished transmit fre quency control Pushing the VFO B TX LED again will restore transmit frequency control to VF
102. ey until Data and USB appear on the display Now enter the Menu system and select Menu U 46 set this Menu Item for the frequency appropriate for your operating mode O For typical RTTY operation select 2125 L this sets the carrier injection up for an offset of 2 125 kHz in a pseudo LSB mode so that the transceiver actually is operating in the LSB mode even though the display still indicates Data USB FT 920 Operating Manual 55 O For Packet operation you may leave Menu U 46 in its default 2125 U pseudo USB mode or set it to 7700 U or some other value as required by the configuration of your TNC See the documentation provided with your TNC s communication software for details re garding defining the transmitted tones The packet frequency display offset may also be modified via Menu U 45 allowing you to have the radio s display indicate either Mark or Space fre quency or the center frequency of the two tones At this point you are ready to utilize your TNC s software to begin operation After loading the soft ware tune in an RTTY station so that it is properly decoded on your computer screen When solid copy is obtained you may press the appropriate key on your computer s keyboard to activate the transmitter and begin typing See your TNC s in struction manual for further details regarding ac tual operation The DSP High and Low Cut filter are particularly beneficial in red
103. eyer or computer driven keying interface while simultaneously allowing the front panel Key jack to be connected to a keyer paddle for utilization of the built in Electronic Keyer See page 18 for configura tion details and operating tips 12 1 14 15 10 1 5 PTT jack This RCA female connector is used for connection of a footswitch or other external switch for Tx Rx com mand control of the FT 920 This jack is wired in par allel with the front panel MOX switch shorting the PTT jack to ground causes the FT 920 to be placed in the Transmit mode while opening the connection to the PTT jack returns the radio to the Receive mode Open circuit voltage is 13 5V DC and short circuit current is 15 mA 6 TR Ry switch This switch selects the switching device to be con nected to the adjacent Tx Gnp jack used for Tx Rx control of peripheral devices such as linear amplifi ers etc With the switch set to the Ry position the Tx Gnn jack is connected to a mechanical relay if the switch is set to Tr the Tx Gnp jack is connected to a switching transistor The specifications for these de vices are shown in the next section 7 Tx Gno Jack This RCA connector is connected to the switching device described above for control of external de vices Please note the specifications for the two de vices available via this jack 60 Watts maximum AC 125V max at 500 mA DC 220V max at270 mA The relay provi
104. fia tLol is chosen you must hold the Step key in while the Fast or Fine indicator is illuminated in order for those tun ing rates to be chosen After releasing the Ster key the tuning rate will return to Normal U 04 OER SPL Function Activation Setting of M Available Values aFF or Default af F If the Quick Split Menu Item is set to anything other than Off pressing the A B key will put the trans ceiver in the Split mode with Tx on VFO B and Rx on VFO A Additionally a frequency offset referenced to the Rx frequency will be applied per your setting of this Menu Item agnitude of Quick Split itt tilt kHz U 05 POT Tx Function Activation De activation of Tx when the Spot key is pushed Available Values cini ar F Default oF F Normally pressing the Spot key only causes you to hear an audible tone corresponding to the pitch of your own transmitted signal in the CW mode By setting this Menu Item to On however you can also cause the FT 920 to transmit when the spoT key is pressed U 06 BEEP F Function Setting of Key Popor Frequency Available Values af F or 227i 040 Hz Default S801 Hz The Menu Item allows you to set the tone of the front panel key Beep tone generator to whatever value is comfortable It also allows you to disable the Beep tone if desired U 07 MTR PH Function Enabling Disabling of the Peak Hold function of the S PO meter
105. g signals is straightforward While receiving press the Rec switch then 0 50 MHZ to start recording The recording level is set automatically so you may leave the listen ing volume at a level which is comfortable for you During recording the hyphen in the Memory Channel display field will blink To stop recording press the Rec switch momen tarily again The last 16 seconds of incoming au dio will now be stored In this way you can quickly confirm for example if a DX station correctly cop ied your callsign through a pile up To play back the stored audio press Pay then 0 50 MHz For playback the front panel s AF Gain control sets the volume level Incoming sig nals however will be cut off for the duration of the audio memory playback FT 920 Operating Manual Transmitting Now that you are familiar with receiver operation we shall explore the FT 920 s capabilities in the transmit mode Important Note Whenever you transmit be certain to have a suitable antenna or 50 Q dummy load con nected to the antenna jack in use Although the FT 920 s final amplifier protection circuitry will drastically reduce power if no load is present there still is a slight chance of dam age to your equipment in the unlikely event of a catastrophic protection circuitry failure The transmitter can be activated within an amateur bands When tuned to any other frequency the trans mitter will
106. he Tuner Off SWR is above 3 1 the tuner s memory system will ignore these settings and the tun ing procedure should be repeated the next time FT 920 Operating Manual 47 you operate on this frequency this feature pre Should you wish to take the antenna tuner out vents you from storing an undesirable setting of line press the Tuner switch momentarily such as that produced when you accidentally The RX Tuner TX indication will disappear from select the wrong antenna on a particular band the display How the Automatic Antenna Tuner Works When the Tuner switch is pressed and the RX Tuner TX indicator is displayed the following operations take place A The tuner s microprocessor reviews the current the tuning conditions if any stored in memory and applies the settings for the frequency closest to the current frequency as a starting point for operation Note that a change in tuning conditions is produced for every change in operating frequency of ap proximately 10 kHz B If transmission occurs without the operator pressing the Tuner key the tuner will begin adjustments if the SWR is found to be 3 1 or greater Tuner settings will not be recorded in this instance If however the Tuner key is pushed and held in for 1 2 second the tuner settings will be stored in the tuner s memory system C If tuning is successfully accomplished and the tuner settings stored into memory the antenna system characteristic
107. he scan ning loop Press the PTT switch to stop the scan now use the front panel or microphone Up or Down key to step through the channels manu ally one at a time and you will observe that the skipped channels are nonetheless available for recall by manual means You may restore a previously skipped channel to the scanning loop by selecting the channel manu ally then press the Mem Group switch for 1 2 sec ond until the Scan indicator is restored to the frequency display panel Programmable Memory Scan PMS Operation The PMS scanning mode allows you to set up band limits within which to scan For example you might elect to scan 50 0 to 50 4 MHz in USB mode watch ing for activity The procedure for establishing such band limits is quite easy First store the lower frequency limit in the P Lo memory channel and the upper frequency limit in the P Hi memory channel In the above example you would store 50 000 MHz in P Lo and 50 400 MHz in P Hi Next switch from the VFO mode to the Memory mode by pressing VFO Men FT 920 Operating Manual Now activate the Memory Tune mode by rotat ing the VFO A Tuning Dial slightly either direc tion You will observe the M Tune indicator on the display Rotate the SQL control until the background noise is silenced then press the microphone UP or Down switch or rotate the scanning ring if using the MD 1
108. hether Mark or Space shall be the idling key up tone Available Values nai E Default agafi The above abbreviations are defined as na Normal The idling tone is Space TE Reverse The idling tone is Mark U 45 PR IISF Function Define the Packet displayed frequency offset Available Values JOL Default 2 125 kHz You can have the display show the suppressed car rier frequency or the center frequency between the two Packet tones for example U 46 PRT FPD Function Align the transceiver to the frequency of the tone pair defined by the TNC Available Values 170 i 1700 1 The above designations of the available values rep resent the center frequency of the Packet tone pairs plus their injection sideband L LSB U USB U 47 RF AMP Function Determine which receiver input preampli fier is to be used on each band Available Values 4 t fc Defaults I i 1 8 24 49 MHz Fic 24 5 54 MHz These preamplifier choices allow the user to custom ize the preamplifier choice for each amateur band Preamplifier At is a Junction FET type providing superior strong signal handling capability while preamplifier is a Dual Gate MOS FET providing best Noise Figure Note that the total gain of the J FET amplifier is somewhat lower than for the MOS FET preamp but on the lower frequency bands the additional gain is not needed The gain of the J FET amplifier rolls off above 30 MHz as does
109. hether or not VFO A is being used to determine the transmit frequency The LED appears orange when the trans mitter is being controlled by VFO A this is the typical situation for transceive operation using VFO A When the corresponding LED near the tuning dial for VFO B is pushed the VFO A TX LED will go out showing that VFO A has relinquished transmit fre quency control Pushing the VFO A TX LED again will restore transmit frequency control to VFO A ANT A gt gad 9 External Receiver FT 920 Operating Manual ANTENNA AB Switch If this LED is pushed while it is already illuminated the FT 920 will be placed in the reduced power Approx 10 W TX Mute mode In this mode the Orange LED will blink 28 VFO A Tuning Dial This large knob is the main tuning dial for the trans ceiver controlling the frequency of the main VFO A Clockwise rotation of the knob increases the fre quency while counter clockwise rotation decreases the frequency The tuning steps of the rotary encoder coupled to the VFO A Tuning Dial are shown below STEP No mal Fast Fine Operating Mode 29 Step Switch Use the Step switch to enable fine or coarse tuning when using the VFO A or VFO B tuning dials as well as the UPA or Down W switches The step switch toggles the tuning steps through the following se quence Fast Fine Normal gt Fast gt The current setting will be indicat
110. hin channel group 2 FT 920 Operating Manual 61 62 Channel d 01 to d 10 Some operating circumstances require the receive and transmit frequencies to be separated by a fre quency range in excess of that provided by the Clari fier feature gt 9 99 kHz For example international SSB operation on the 7 MHz band may require one station to transmit in the frequency range 7 040 7 100 MHz while the other station must transmit in the 7 150 7 300 MHz range The FT 920 provides ten special memories for such operating instances Storage and recall are similar to that described pre viously Split Frequency Memory Channel Storage Set VFO A to the required receive frequency and mode and set VFO B to the required transmit fre quency and mode Press the Orange VFO B TX LED Switch to activate the Split mode previously discussed on page 54 Note It is also acceptable to store the transmit frequency on VFO A and the receive frequency on VFO B if you prefer In this case in step above press the VFO B RX LED Switch to set up the appropriate Tx Rx relationship between the two VFOs Press the V gt M switch momentarily to enter the Memory Check mode the M CK indicator will blink then use the UPA or Down Y key to select the memory channel you wish to use from the special Split memories numbered d 01 through d 10 When you have chosen the desired memory chan
111. hold it in for 1 2 second to lock the Shuttle Jog When either control is locked the Lock indicator below the VFO A indicator on the display panel will be illuminated 32 Di spLay Switch This switch changes the function of the VFO B read out area of the display panel In the normal mode the VFO B frequency is displayed When this button is pushed and you are operating in the MR Memory Recall mode any alphanumeric memos Alpha Tags you have programmed will be substituted in place of the frequency display on the VFO B side Press this switch again to return to the frequency dis play mode 33 VFO A gt B Switch Pressing and holding this switch in for second causes the contents of VFO A to be copied into VFO B so that the two VFOs contents will be identical 34 VFO A 4 B Switch Pressing this switch momentarily to swap the con tents of VFO A with those of VFO B 35 VFO Mem Switch Pressing this switch changes frequency control be tween the VFO and Memory systems Repeatedly pushing this switch causes frequency control to toggle between the two systems 36 RPT Switch Pressing this switch while on 28 MHz in the FM op erating mode causes a standard repeater shift de fault 100 kHz to be applied to the operating fre quency during transmission additionally a subaudible CTCSS encode tone default 88 5 Hz will be superimposed on your transmitted signal for accessing
112. igital Soeech Processor Operation The Digital Speech Processor provides two chief methods of enhancing your SSB talk power O Using digital audio compression methods the Digital Speech Processor increases your transceiver s average power output and O Using specially designed digital equalization techniques you may choose a DSP voice pat tern contour which most closely matches your voice s characteristics so as to focus more of the available transmitter power into transmis sion of the most useful frequency components of your speech Four different voice pattern contours are available Once you have correctly set the Mic Gain control s level you may set up the Digital Soeech Processor as follows Press the Meter SE EcT switch so that the trans mitter selection is set to Comp Press the Proc switch once so that the Proc indi cator on the display becomes illuminated Press the PTT switch and speak into the micro phone in a normal voice level You will observe FT 920 Operating Manual 49 the Comp meter indication fluctuating according to your speech input Now adjust the front panel s Proc LeveL control so that the reading on the Comp scale peaks at or below 10 dB To deactivate the Digital Speech Processor press the Proc switch once more The Proc indicator on the display will disappear Raising the compression level generally raises talk power however excessive advancement of the Proc Leve
113. ilable Values D tS Default 5 The adjustment values are an arbitrary scale Set the VOX Gain to the level which quickly activates the transmitter yet does not pick up extraneous noises in your operating room FT 920 Operating Manual U 66 1 i ANTR Function Set the level of the Anti Trip circuitry of the VOX system Available Values 15 Default 5 This adjustment scale is also arbitrary This Menu Item should be set to the point where loud speaker volume does not activate the VOX U 67 0 MENG Function Define which items are to be included in the Quick Menu bank Available Values All Menu Items Default OFF After pressing Ent while using this Menu Item ro tate the VFO B Tuning Dial to select the Menu Item to be included excluded from Quick Menu then use the front panel UPA or Down Y key to change the setting for that Menu Item to ON or OFF The default setting for this Menu Item is OFF which means that there is no Quick Menu feature active When this is the case a momentary press of the Menu key activates Normal Menu operation When one or more items have been designated for Quick Menu use however a momentary press of Menu activates the Quick Menu pressing and holding Menu in for 1 2 seconds activates Normal menu operation in this case U 68 FM STEP Function Set scanning steps to be used during FM operation Available Values FF D5 SilkHz Defaul
114. ilter FM F3E Variable reactance PM FSK J1D J2D Audio Frequency Shifted Keying 2 5 kHz narrow 5 0 kHz wide 170 425 and 850 Hz 200 Hz At least 50 dB below peak output HF At least 60 dB below peak output VHF At least 40 dB below peak output At least 50 dB below peak output Not more than 6 dB from 400 to 2600 Hz 31 dB or better 100 Watts PEP 14 MHz 500 Q 600 Q FT 920 Operating Manual Receiver Circuit Type Intermediate Frequencies Sensitivity IF Selectivity 6 60 dB Squelch Sensitivity IPO Off IF Rejection Image Rejection IF Shift Range DSP Notch Depth Audio Output Audio Output Impedance SPKR Double conversion Superheterodyne FM Triple conversion 68 985 MHz 8 215 MHz 455 kHz FM Frequency SSB CW Dig 2 4 kHz AM 6kHz FM 28 MHz 150 250 kHz 5 uV 40 uV 250 500 kHz 4 uV 32 uV 0 5 1 8 MHz 2 uV 16 uV 1 8 24 5 MHz 0 20 uV 2 uV 0 5 uV 24 5 54 MHz 0 13 uV 1 3 uV 0 25 uV With Preamp On for 10 dB S N N or 12 dB FM SINAD SSB CW FSK AFSK 2 4 kHz 5 0 kHz CW 500 Hz 1 8 kHz w optional YF 116C CW Filter AM 6 kHz 14 kHz w optional YF 116A AM Filter FM 12kHz 25 kHz w optional FM 1 FM Unit SSB CW Digital AM lt 2 0 uV FM 28 56 MHz lt 0 32 uV gt 70 dB HF gt 50 dB VHF gt 70 dB 1 8 56 MHz 1 2 kHz gt 35 dB 1 5 W into 4 Q with lt 10 THD Speaker 100 mV 600 Q Digital fixed level 49 8Q Automatic Antenna Tuner Impedance
115. immediate area do not attempt to disconnect the cables as you could be killed instantly should lightning strike your antenna structure or a nearby power line If a vertical antenna is used be certain that humans and or pets or farm animals are kept away both from the radiating element to prevent electrical shock and RF exposure danger and the ground system in the event of an electrical storm The buried radials of a ground mounted vertical antenna can carry lethal voltages outward from the center of the antenna in the event of a direct lightning strike FT 920 Operating Manual Il 12 5 RF Field Exposure Advisory and Electromagnetic Compatibility This transceiver is capable of power output in ex cess of 50 Watts so customers in the United States may be required to demonstrate compliance with Federal Communications Commission FCC regu lations concerning maximum permissible exposure to radio frequency energy Compliance is based on the actual power output used feedline loss antenna type and height and other factors which can only be evaluated as a system Information regarding these regulations may be available from your Dealer your local radio club from the FCC directly press releases and other information can be found on the FCC s site on the World Wide Web at lt http www fcc gov gt or from the American Radio Relay League Inc 225 Main St Newington CT 06111 or lt http www arrl org gt Remem
116. in volatile memory so when the battery s voltage ultimately is exhausted the trans ceiver will not be disabled you will just observe that your memories have disappeared In some cases of erratic operation it may be advis able to reset the microprocessor to its factory default condition so as to determine whether or not a part failure has caused improper action as opposed to some operational error This section describes the procedures to be used for these situations BACAR UPS Siwy OFF a OWN Backup Battery Replacement The backup battery is a standard Sony CR2032 or equivalent which is installed in a socket on the bottom side of the transceiver Replacement of the battery is easy to accomplish Remove the bottom cover of the transceiver see page 93 Locate the backup battery per the illustration lo cated near the front panelin the vicinity of the bright silver enclosure on the left side Remove the origi nal backup battery and replace it with a fresh one be sure the replacement battery shows at least 3 Volts on a Voltmeter Before closing the case be certain to check that you have not accidentally changed the position of the Backup switch located near the backup bat tery but immediately adjacent to the above refer enced silver enclosure This switch must be in the On position for the backup system to work Close up the case replacing the six screws on the bottom then tighteni
117. inear amplifier ALC voltage is used to provide dynamic control of the output of the transceiver so as not to provide more drive than is needed for full amplifier output The ALC control voltage range is 0 to 4 V DC with the voltage going more negative as the amplifier s drive requirements are approaching fulfillment The FT 920 s ALC system is very typical of designs in the amateur radio industry and consequently is compatible with many manufactured and home built amplifiers However ALC voltage may be generated by an amplifier in a manner incompatible with effi cient ALC operation in the FT 920 and it is important that you recognize the differences in amplifier ALC circuits before proceeding with ALC line connection O ALC circuits which detect Power Output from the amplifier and generate negative going ALC control voltage when maximum output power has been realized will generally work properly with the FT 920 The exact amount of ALC volt age fed to the FT 920 can usually be adjusted via a potentiometer on the rear panel of the amplifier O ALC circuits which detect Amplifier Tube Grid Current and generate ALC voltage when ex cessive grid current is present may not work well with the FT 920 and other similar trans FT 920 Operating Manual 13 14 ceivers as the ALC voltage may be generated because of amplifier mis tuning not related to an excessive drive condition With amplifiers deriving their ALC voltage in
118. ing another key These Menu Items are shown below For example here is how to use the Panel Menu fea F tion D ar Press this key while uneton Descrpron Holding in Step key u8 Display Dimmer On Off DisPLav Key uos Multi Panel Display Choice A B key Enhanced Tuning Scale Merer SeLecT Key Display VOX Hang Time in CW Bx In Ke J uae VOCHEOTeMON teeter r ae i Frequency ture to activate the Display Dimmer Press and hold in the Step key While you are holding in the Step key press the Display key Menu U 08 will appear just to the left of the DIMMER title and oFF will blink in the main display area This means that the cur rent condition of the Dimmer is Off Rotate the VFO B Tuning Dial to select on you will note that the display just got darker Press the ENT key on the keypad You may now rotate the VFO B Tuning Dial if you want to change some other Menu Item or just press Menu to exit the Menu System and resume normal opera tion Quick Menu Operation The Quick Menu feature allows you to select certain Menu Items you feel the need to change more fre quently These are assembled into Quick Menu bank which operates almost identically to the Normal Menu mode However access is very slightly differ ent O When you have created a Quick Menu you activate it by pressing Menu momentarily as described above in the Normal Menu Opera tion
119. ir in from the side of the transceiver and expel warm air from the rear exhaust port Do not install this transceiver on top of another heat generating device such as a linear amplifier and do not place equipment books or papers on top of the transceiver Place the radio on a hard flat stable surface Avoid heating vents and window locations that could expose the transceiver to excessive direct sunlight especially in hot climates Grounding The FT 920 HF transceiver like any other HF com munications apparatus requires an effective ground system for maximum electrical safety and best com munications effectiveness A good ground system can contribute to station efficiency in a number of ways O Itcan minimize the possibility of electrical shock to the operator O It can minimize RF currents flowing on the shield of the coaxial cable and the chassis of the transceiver such currents may lead to ra diation which can cause interference to home entertainment devices or laboratory test equip ment O It can minimize the possibility of erratic trans ceiver accessory operation caused by RF feed back and or improper current flow through logic devices An effective earth ground system make take several forms for a more complete discussion see an ap propriate RF engineering text The information be low is intended only as a guideline Typically the ground connection consists of one or more copper clad steel rods driv
120. kHz segments containing an Amateur band Transmission will be inhibited when the Gen icon is lit 13 Fine This icon is illuminated when Fine synthesizer steps have been selected for fine tuning using the VFO A and VFO B Tuning Knobs or the Up A Down switches The tuning rate in the Fine mode is 1 10th the Normal rate 14 NB This icon is illuminated when the IF Noise Blanker is turned on 15 VFO A Mode These icons display the operating mode in use on VFO A 16 Moni This icon is illuminated when the voice monitor is ac tivated 17 Enhanced Tuning Scale This meter scale provides a wide variety of informa tion regarding the operation of the transceiver de pending on its configuration via Menu Item U 10 At the factory the Enhanced Tuning Scale is set up so as to provide a visual representation of the DSP system s bandwidth Other configurations allow de piction of the Clarifier offset direction and magnitude as well as tuning accuracy See the discussion on page 74 for details 18 VFO A Frequency Display This is the main frequency display for the transceiver s primary A VFO Display resolution to 10 Hz is pro vided 19 Lock This icon is illuminated when the VFO A Lock func tion is activated so as to prevent inadvertent frequency changes 20 QMB This icon is illuminated when frequency data is re called from the Quick Memory Bank 21 VFO
121. lay the message stored in that memory register The transmitter will automatically be activated for message generation after which the transceiver will automatically revert to the receive mode The CW Message Memory and electronic keyer only function in the CW mode If you wish to prac tice sending or check message memory contents be certain to select the CW mode of operation Split Frequency Operation DX operators frequently have need for split frequency operation whereby a DX pedition station may trans mit on one frequency while listening over a segment of the same band The FT 920 provides several means of efficient split frequency operations for DX operation and even certain satellite operating situa tions TX Crarifier Operation For splits of up to 9 99 kHz the TX Clarifier_pro vides a simple means of split operation Example DX1DX is transmitting on 14 024 0 MHz listening Up 5 kHz With the Clarifier set to zero offset tune in DX1DX on 14 024 00 MHz using the Main VFO Tuning Dial Press the TX Cuar button and rotate the Sub VFO Tuning Dial so as to set up a Clarifier off set of 5 00 kHz Push the RX Cuar button and you will now be listening in the area of 14 029 0 MHz You may hear a number of stations calling and you may hear this station currently being worked by DX1DX If you can hear the station being worked by DX1DX press the Spot key and adjust the VFO B Tuning Dial so as to align
122. ll CQ on that frequency while periodically checking 28 885 MHz for stations report ing band openings on 6 meters To activate Dual Watch Set up transmit and receive operation on VFO A establishing your primary monitoring frequency Set up the frequency to be checked periodically on VFO B Verify that the correct antenna A or B has been selected for VFOs A and B if they are on different bands The Dual Watch feature will automatically switch antennas for you during the VFO A B switching process Rotate the SQL control until the background noise is silenced Press the DW key The decimal points in both frequency displays will blink and you will observe that every few seconds the green RX indicator for VFO B will become illuminated for an instant This shows you when VFO B is being checked for activity If a station is detected on the VFO B frequency the FT 920 will pause on the VFO B frequency and stay there according to the Menu selections you made per the Scan Resume Choices ear lier Press DW again to cancel Dual Watch Note that pressing the PTT switch on the microphone does not cancel Dual Watch operation The time interval between Dual Watch excursions to VFO B may be adjusted via Menu Item U 18 to any value between 3 and 15 seconds The default setting is 10 seconds The VFO A register need not be in the VFO mode it may also be set to a Memory Channel or a QMB cha
123. n a contest Message Memory Storage Press the Rec switch then one of the keypad keys numbered 1 4 8 or 9 to store a mes sage in one of those slots Memories 1 4 will accommodate messages of up to 50 characters in length while Memories 8 and 9 will accom modate messages of up to 20 characters in length Additionally Memory 9 canaccommodate a mes sage within which a sequential contest number may be imbedded After pressing one of the numbered keys start sending the desired message e g CQ TEST JA1YOE JA1YOE K The storage process will be terminated automatically To imbed a contest serial number in a message send three Question Marks at the desired point in a message assigned to the 9 key For example to send 599001 599002 and so forth store BNN into the special Contest Number FT 920 Operating Manual Memory Register Key 9 If the number gets out of sequence during the contest you may set the number to an arbitrary value via Menu Item U 25 Review of Stored Messages To review messages previously stored without send ing them over the air press and hold in the Ptay switch for 2 second then press the desired number key on the keypad You will hear the message via the Sidetone circuit so as to check it for accuracy Transmission of Stored Messages Press the PLay switch momentarily then one of the number keys 1 4 8 or 9 to p
124. nal disappears at the end of the other station s transmission at which point the scan ner will resume While the radio is in the Pause condition the decimal points in the Main VFO A frequency display area will blink See Scan Re sume Choices below for details of how to cus tomize the resumption of scanning Press the PTT switch on the microphone to can cel scanning and return to normal Tuning Dial operation Scan Skip Programming Memory Mode Only Among the memories you have programmed there may be some stations which you do not wish to scan For example standard time stations like WWV JJY CHU LOL RWM or VNG transmit a continuous car rier which might always stop the scanner thus pre venting you from encountering a different station Therefore you may designate certain memory chan nels to be skipped during scanning but otherwise left intact for manual channel selection Here s how to remove a channel from the scanning loop Recall the memory channel to be skipped Press and hold in the Mem Group key for 1 2 sec ond until the Scan indicator on the display panel goes off this shows that this channel is now not eligible for scanning Repeat steps and as many times as neces sary to skip all the channels you do not wish to scan Initiate memory scanning as described previ ously and you will observe that the channels you marked to be skipped are not included in t
125. need to spin the VFO A tuning dial to move quickly from one frequency to another Basically the Shuttle Jog is a spring loaded ring used for frequency change Rotating the Shuttle Jog ring away from its center detent in either direction will ini tiate tuning The farther the Shuttle Jog ring is moved from the center the larger and faster the amount of frequency change which results minimum steps with slight rotation of the Shuttle Jog ring are 10 Hz Front Panel Up Down Switches These switches may also be used for quick frequency excursions from one end of a band to another In the Normal position of the SteP switch for example one touch of the UP switch will cause the frequency to jump upward by 100 kHz The frequency STEP SWITCH POSITION jumps available are NORMAL shown at the right 100k Hz 10kHz MH 31B8 Hand Mic Up Dwn Fst Switches Pushing the MH 31B8 s Up or Dwn switch will initiate tuning in an upward or downward direction in fre quency steps set in accordance with the selection made via the Step switch Pushing the Fst key will switch tuning into the Fast mode as though the front panel Step switch had been set to Fast See the table below for a summary of the steps available in these modes of operation FST FST UP DWN SSB CW paTaissB 10Hz 110Hz 100Hz 100Hz AM FM DATA FM 100Hz 1100Hz 1kHz 1kHz MD 100A8X Desk Microphone Rot
126. nels 62 Tuner Switch This is the On Off switch for the FT 920 s Automatic Antenna Tuner Pressing this switch momentarily places the Antenna Tuner in line Pressing and holding in this switch for 1 2 second ac tivates the Automatic Matching mode in which a car rier is generated and the tuner s microprocessor based circuitry selects values of inductance and ca pacitance so as to present a low SWR to the transmitter s output port Mi Be certain to have an antenna or dummy load con nected to the antenna jack on the rear of the trans ceiver before initiating Automatic Antenna Tuner matching procedures 63 SHIFT Control This control adjusts the receiver s IF Shift feature which adjusts the 8 2 MHz IF position relative to the center frequency of the selected IF filter in all modes except FM The default position for this control is at 12 o clock and an adjustment range of 1 26 kHz is provided the pitch of the incoming signals will not change 64 NR Control This control adjusts the level of the DSP based Noise Reduction feature Clockwise rotation of this control increased the degree of noise reduction 65 DSP Switch This is the On Off switch for the Digital Signal Pro cessing Circuitry 66 Low Cut HicH Cut Controls These controls adjust the passband cutoff frequen cies of the receiver s High Cut and Low Cut DSP fil ters The inner control adjusts the Low Cut charac teristics with a physical
127. ng the four screws on the side panels Be careful not to pinch any wires while re assembling the radio FT 920 Operating Manual 92 Microprocessor Reset Procedures Three levels of microprocessor resetting are avail able only two of which are typically used These are O A reset of all memories antenna tuner data and VFO frequencies to their factory defaults Menu settings are not affected by this procedure To do this turn the transceiver off then press and hold in the Gen and Ent keys on the keyboard and hold them in while you turn the Power switch back on The VFO B frequency display area will indi cate Inmar and a series of Dashes will slowly disappear across the middle of the VFO A fre quency display area When the initialization pro cedure is complete the frequency displays newly reset to 7 000 MHz in the LSB mode will reap ceiver off then press and hold in the Menu and CLear Car keys and hold them in while you turn the Power switch back on If the transceiver s microprocessor still is behav ing erratically you may need to perform a com plete hard reset of the CPU To do this remove the bottom cover of the transceiver as described previously Now set the Backup switch to the OFF position Wait about 30 seconds then plug the DC cable back into the rear panel DC jack Turn the transceiver on then carefully turn the Backup switch on using a non conducting alignment tool or a tooth
128. nges in cluding high atmospheric noise levels strong local signals and a lack of antenna directivity compared with higher frequency multielement beam antennas The FT 920 is particularly well equipped to assist the operator in maintaining reliable communications un der these difficult conditions The receiver section front end includes a high inter cept doubly balanced mixer which provides excel lent immunity from intermodulation For protection against the ingress of out of band signals which can cause intermodulation the receiver front end is pro tected by a bank of bandpass filters including spe cial high Q filters for the 7 14 21 and 50 MHz bands And the built in Automatic Antenna Tuner may be engaged on receive as well as transmit providing extra protection against strong signals outside the current band of interest Other features of interest to the operator in strong signal environments include IPO Intercept Point Optimization The IPO feature reduces the receiver front end gain by bypassing the RF preamplifier When the extra gain of the preamp is not needed typically below about 10 MHz engaging the IPO feature will reduce the background noise level and improve the receiver s immunity by reducing the signal level presented to the first mixer So long as background band noise is still audible the useful sensitivity of the receiver will not have been reduced by activating the IPO To turn this featu
129. ning pulser via Antenna A Available Values 00 55 10 Default iii If you have different amplifiers for different bands each with unique drive requirements you may use this setting to define the tune up power level via the A antenna port U 54 LI PD Function Set the power output for the Linear Ampli fier Tuning pulser via Antenna B Available Values tiitt 50 110 Default iii If you have different amplifiers for different bands each with unique drive requirements you may use this setting to define the tune up power level via the B antenna port U 55 LI TIME Function Define the duration of the Linear Amplifier Tuning pulser s tune up period Available Values Seconds Default tf Seconds When the ENT key is pressed while in Menu Item U 52 a pulsed signal will be transmitted for a num ber of seconds after which the transceiver will return to the Receive mode The tuning time period is set via this Menu Item U 56 LI SPAL Function Set the length of the spaces between the Tx pulses defined in Menu Item U 57 Available Values ff JGL ms Default ii ms A lower value set in this Menu Item makes the pulser s action more closely appear to resemble a continu ous key down tone The duty cycle is lower though depending on the pulse length set via Menu Item U 57 U 57 LI MARK Function Set the length of the Tx pulse for the Lin ear Amplifier Tuning pulser Available Val
130. nits of non Yaesu manufacture for installation instructions Operation Phone patch Tx Rx switching may be done manually using the PTT method or automatically using the VOX circuitry of the transceiver While the manual PTT method does not require careful balancing of the LL 7 s bridge circuit it does require more work by the operator you must manually switch the PTT or MOX switch every time someone in the patched conversation says Over Therefore most opera tors prefer to use the VOX method whenever the telephone signal to noise ratio permits If the tele phone line noise level is high however the PTT method may still be necessary so you should be come familiar with both methods ANTENNA A Note You may need to contact your telephone com pany for permission to connect an external de vice such as a phone patch to the telephone system s lines Also you should procure and use a Suitable 600 Q three way transformer if connecting the LL 7 and a telephone handset to the same telephone line Regardless of which patch Tx Rx control method is used you may need to instruct the person on the telephone to speak slowly in a clear steady voice level and to say Over when a response is expected from the other party This will serve as a notice to you if you are using PTT control to switch to receive while signaling the other station to go ahead and trans mit so as to avoid
131. nnel if you like Note also that the active Rx VFO at the time that DW is pushed will be the one on which the transceiver will hold checking the opposite VFO periodically Therefore if the green RX LED for VFO B is illumi nated when you push DW the FT 920 will hold on VFO B then check VFO A periodically for activity Remember that the squelch must be engaged in or der for Dual Watch to function During Dual Watch transmitting remains enabled and the VFO frequen cies may be changed The FT 920 s Menu System allows you the owner to customize a wide variety of transceiver perfor mance aspects and operating characteristics Such FT 920 Operating Manual a large number of adjustments would ordinarily re quire dozens of additional knobs on the front panel of the transceiver thus complicating operation hope lessly The Ergonomics Design Team at Yaesu Musen Co Ltd therefore created the Menu System such that virtually all Menu items are of the set and for get variety not requiring revision during day to day operation Three Menu operating modes are provided allowing different avenues of access to the Menu System These are Oj Normal Menu operation 73 selections ac cessed by pressing the Menu key O Panel Menu operation 5 fixed selections ac cessed by holding in the Step key plus one additional key providing instant access to criti cal Menu items O Quick Menu operation 5 user selecte
132. o activate the Voice Moni tor the Mont indicator on the display will become illuminated Now when you speak your voice will be audible from the speaker or headphones Adjust the Monitor s volume by rotating the Moni LeveL control Clockwise rotation increases the volume level from the Monitor Press the Moni switch again to turn the Monitor off Digital Voice Recorder Operation Transmit The FT 920 s Digital Voice Recorder can be used to store as many as four messages in your own voice of up to 16 seconds in length Such messages may be used for repetitive CQ calling for contest work you might also use the Digital Voice Recorder to store your callsign phonetically then send it automatically in a pile up situation late at night when you don t wish to awaken other family members you can also store Roger roger five nine fifty nine plus your callsign to complete the contact Operation is similar to that described for receive mode recording see page 46 except that the Rec and Play keys are pressed and held in for 2 second to accomplish the desired action on receive these switches are pressed momentarily The four message locations are designated by the 1 4 Bann keys Press and hold in the Rec key for 1 2 second then press the 1 key on the keypad to begin record ing in DVR memory 1 Speak into the microphone in a steady voice level The recording volume level is set aut
133. o select the AGC recovery time press the front panel s AGC switch repeatedly You will observe the display icons cycling through the available selections AGC Fast gt AGC Stow AGC Orr gt AGC Fast gt The AGC Fast position is usually preferable for CW and SSB contest work while you may prefer AGC Stow for more casual voice work AGC Orr is most often used for precise measurement of signals when evaluating antenna patterns etc but strong signals will sound very distorted with the AGC turned off Rotating the RF Gain control counter clockwise will help reduce the distortion Squelch If you wish to mute the FT 920 s receiver during no signal conditions rotate the SQL Squelch control clockwise until the background noise just disappears This threshold point is the setting which produces the best sensitivity of the squelch to weak incoming sig nals When a signal is received which exceeds the thresh old set by the SQL control the muting function will be disabled and normal receiver audio will flow When the signal disappears the receiver will again be muted The Squelch circuitry is most often used during FM operation but the FT 920 s Squelch system is op erational in all modes It may be particularly useful while monitoring a 6 meter calling frequency such as 50 125 MHz or when waiting for a Mode A 29 MHz downlink satellite to come within range To disable the Squelch system s muting capability
134. ofturn the Clarifier itself off 55 Spot Switch In the CW mode this switch activates a spotting tone used for precise zeroing in onto an incoming RX signal By matching the pitch of the incoming signal exactly to the pitch of the Spot tone your transmitter s signal will be precisely aligned to a Zero Beat posi tion relative to the other station s signal FT 920 Operating Manual 56 Bx In Switch Pressing this switch in the CW mode places the transceiver in the Full Break In QSK mode 57 Kever Switch This is the On Off switch for the built in Electronic Keyer 58 Speen Control This is the Speed control for the built in Electronic Keyer Clockwise rotation increased the sending speed 59 Pitcu Control This control adjusts the pitch of A the Spot tone B the corresponding pitch of your FT 920 s trans mitted carrier and C the center frequency of the receive passband The available range of frequen cies is 300 1050 Hz in 50 Hz steps 60 Siwe Tone Control This control adjusts the level of the CW monitor sidetone Clockwise rotation increases the monitor level 61 Mem Group Switch This switch is used to select the Memory Group Recall mode of Memory operation In this mode only those memory channels within the designated group will be available for recall this is useful in reducing channel selection time if you only are interested in watching a few particular chan
135. omatically so the Mic Gain control has no effect during DVR recording Press the 1 key again to stop recording if you elect not to use the full 16 seconds available Repeat this process for any of message locations 2 4 into which you wish to store a message To review the message without transmitting it press and hold in the Moni key for 1 2 second The replay volume may be adjusted using the AF Gain control To transmit the stored message over the air press and hold in the Pay key for 1 2 second followed immediately by the appropriate Bano key The PTT circuitry will automatically engage switching the FT 920 into the transmit mode and the transceiver will return to receive at the completion of the mes sage FT 920 Operating Manual The input level of your voice signal to the Digital Voice Recorder may be adjusted by using the Mic Gain con trol The optimum settings for the Recorder may how ever be slightly different from those used in normal operation this is normal CW Transmission The FT 920 s versatile design allows the CW opera tor unparalleled flexibility for operation using the in ternal electronic keyer an external keyer a computer driven keying interface or a straight key The best selections for interconnections and switch positioning will depend critically on your application See the configuration details beginning on page 18 for suggestions Straight Key Operation
136. on o Default fut c The available choices are Muto The selection of Antenna A Antenna B or RX is stored in VFO or Memory regis ters so no operator intervention is needed when changing bands or memories inso far as antenna selection is concerned an The Antenna A B RX switch is functional but the settings are not stored in VFO or Memory registers You must manually choose the antenna selection yourself aor Only Antenna A is available There is no path provided to Antenna B nor the RX Only antenna l ue U 42 FTTY TN Function Select the offset frequency and injection sideband for the Mark tone produced by the inter nal RTTY generator Available Values 1 25 Default H 2 tc 5t The available choices include Ha iL The Mark tone is offset 2 125 kHz USB injection Lo tei The Mark tone is offset 1 275 kHz USB injection caL The Mark tone is offset 2 125 kHz LSB injection AL The Mark tone is offset 1 275 kHz LSB injection The Shift tone s frequency is offset from the Mark tone by an amount determined by the next Menu Item U 43 RTTY Shift U 43 FTTY SH Function Set the desired RTTY Mark Space fre quency shift Available Values Ft iit Default 5Ft ti This Menu Item determines the amount of shift to be applied from the Mark tone frequency which was pro grammed via Menu Item U 42 RTTY Tones SFE 425 c i pa L FT 920 Operating Manual U 44 SFT PEL Function Define w
137. ondition for the receiver is active with the input preamplifier being bypassed 5 Att 6 12 18 This icon is illuminated when the receiver input pream plifier is On and it displays the number of dB of at tenuation 6 AGC F S AGC OFF These icons indicate the current operating mode for the Automatic Gain Control circuitry 7 TRANSMIT This icon becomes illuminated during transmission If you attempt to transmit outside of an authorized transmit range this icon will disappear and ERROR will appear on the main frequency display area 8 Busy This icon is illuminated during reception so long as the receiver is unsquelched By keeping the SaueLcH control fully counter clockwise receiver audio will al ways be present and the Busy icon will stay lit 9 SPLIT This icon is illuminated during Split operation using VFO A for reception and VFO B for transmission or vice versa 10 Fast This icon is illuminated when Fast synthesizer steps have been selected for more rapid frequency navi gation using the VFO A and VFO B Tuning Knobs or the Up A Down switches In the Fast mode the frequency change is multiplied by a factor of 10 11 Nar This icon is illuminated when a Narrow filter in those modes where one is available has been selected FT 920 Operating Manual 12 Gen This icon is illuminated when the transceiver is tuned to a frequency outside one of the 500
138. out of the way connect the plug instead to the rear panel Key jack and set the rear panel Pot Key switch to Po If two operators are using the FT 920 simulta neously for a contest Field Day etc a second keyer paddle may be connected to the rear panel Key jack Be sure that the rear panel s PpoL Key switch is set to Ppt so that both operators have access to the internal electronic memory keyer and switch the front panel Kever switch on If two operators are using the FT 920 simulta neously but both wish to use a straight key bug or an outboard electronic keyer the key plugs may be inserted into the front and rear panel Key jacks now turn the front panel s Kever switch off Irre spective of the setting of the Ppt Key switch the tip connections on both Key plugs will serve as Straight Key lines for accommodating this appli cation If you are using a computer driven CW keying in terface with contest software but want to be able to send occasional repeat messages quickly using the FT 920 s internal keyer connect your keyer paddle to the front panel Key jack and the keying interface line which emulates a straight key to the rear panel Key jack In this configura tion set the rear panel s Ppot Key switch to the Key position which re configures only the rear panel s Key jack to accept a Manual keying line Note that the rear panel Key jack carries the capabil ity to support
139. panel controls and switches to the following positions Power VOX MOX all off Mic Gain 9 o clock AF Gain 9 o clock RF Power fully clockwise RF Gain fully clockwise SHIFT 12 o clock NR 12 o clock Low Cut fully counter clockwise approximately 7 o clock HicH Cut fully clockwise approximately 5 o clock SQL fully counter clockwise Proc LeveL fully counter clockwise Moni LeveL fully counter clockwise NB LeveL fully counter clockwise SPEED 12 o clock Pitcu 12 o clock S pe TONE 12 o clock These represent typical starting points for operation optimum setting procedures will be discussed later Note that a wide variety of transceiver characteris tics may be optimized or adjusted using the Menu System discussed in detail beginning on page 69 Connect your microphone and CW key paddle to the appropriate jacks then turn on your 13 5 Volt DC power supply Receiving Press the Power switch to turn the transceiver on As suming that this is the first time you have used the FT 920 the display should look like this Io Li Inspection of the display will show you that both VFO A and VFO B are set to 7 000 00 MHz in the LSB mode The Green RX and Orange TX LEDs associated with VFO A should both be illuminated indicating that all frequency control is being exercised by that VFO You should now be hearing background noise Ad just the AF Gain control for a comfortable lis
140. pcay key to revert to display of the operating frequency instead of the Aloha Numeric Label Press Display once more to return to dis play of the Label Labels generally are not appended to Split Fre quency channels as they are usually stored for 7 MHz SSB applications where one or both frequen cies may change often If you must store a Label on a Split channel the Label will of course ob scure the display of the VFO B frequency usu ally the Tx frequency However if you move the VFO B Tuning Dial thus entering the Memory Tune mode so as to adjust your Tx frequency the display will instantly revert to indication of the frequency and will stay in that condition for about four seconds after tuning has stopped Then the Label will return Memory Mode Accessories Moving Memory Data to VFO A Data stored on memory channels can easily be moved to VFO A if you like FT 920 Operating Manual First use the Up A or Down Y key or the VFO letion process is not a hard erasure so if you erase B Tuning Dial after pressing Mem Cu to select the memory channel containing the frequency data to be moved to VFO A Next press and hold in the M gt V key for second until you hear a double beep The data will now have been copied to VFO A although the original memory contents will remain intact on the previously stored channel If a Split Frequency Memory Channel was trans ferred the Rx Tx frequency rela
141. pick The transceiver may now be turned off the DC cable removed and the bottom cover replaced pear A reset of just the Menu settings is also possible This will not wipe out any other memories but will allow you to clear all Menu settings to their origi nal factory default values To do this turn the trans Important Note Be extremely careful not to come in contact with any transceiver internal circuitry while the bottom case is removed as possibly dangerous voltages may exist inside the case FT 920 Operating Manual Bottom Case Removal connected to it Turn the transceiver off and remove all cables Turn the transceiver upside down and remove the six screws affixing the bottom panel of the radio Loosen the four screws on the sides of the upper case but do not remove them Now fold the rear of the bottom panel slightly away from the chassis and remove the bottom panel by sliding it rearward re assembling the radio FT 920 Operating Manual To close up the case replace the six screws on the bottom then tighten the four screws on the side panels Be careful not to pinch any wires while l a e j YE 1 y i ea j PMT Mounting Positic TEOT Mount nig F uhal 7 ifs Figure 2 YF idi CG Mounting Position 164 Mounting Position a a ania gt Remove gt Loosen Figure 1 Ti 93 94 Installation of O
142. provided by the Enhanced Tuning Scale By pressing the Spot key you will activate a constant audio sidetone which is set to the pitch which matches precisely the pitch of your transmitted sig nal The sidetone pitch frequency also corresponds to the center frequency of the receiver filter pass band with the IF Suirt control centered in its default position By aligning the CW Spot tone to match the pitch of an incoming station s signal you will cause your signal and the other station s signal to be ex actly on the same frequency The Spot tone s center frequency may be adjusted to any value between 300 Hz and 1050 Hz in 50 Hz steps by rotation of the Pitcu control RF Preamplifier Selections Two RF preamplifier circuits are provided on the FT 920 each yielding particular benefits for the varying requirements throughout the operational range of this transceiver O A Junction FET JFET preamplifier includes high Q selectivity for excellent protection from out of band energy O A Dual Gate MOSFET preamplifier provides high gain and low noise figure particular ben eficial on the higher bands Via Menu Item U 47 you may assign these pream plifiers on a band by band basis the default selec FT 920 Operating Manual 41 tions are the JFET preamp on the 1 8 21 MHz bands and the MOSFET preamp on the 24 50 MHz bands We recommend that you use these settings initially and only change them later if you
143. ptional Filters YF 116C YF 116A Remove the bottom case of the transceiver see previous page Refer to Figure 2 on the previous page and lo cate the mounting positions for the CW YF 116C and or AM YF 116A filters on the Main Unit Refer to Figure 3 and push the optional filter board onto the pins corresponding to its assigned mount ing location on the radio Gently press the board down until it is firmly seated in its connectors Replace the bottom case of the transceiver Turn the transceiver on and enter the Menu mode Per the chart below change the setting of Menu Item U 69 to On if installing the YF 116C CW filter and or change the setting of Menu Item U 70 to On if installing the YF 116A AM filter Filter installation is now complete Installation of High Stability Oscillator TCXO 7 Remove the bottom case of the transceiver see previous page Refer to Figure 2 on the previous page and lo cate the mounting position for the TCXO 7 which currently is occupied by the Rer Osc Unit Refer to Figure 4 and remove the Ref Osc UNr7 replacing it with the TCXO 7 Installation is now complete as the TCXO 7 has been carefully aligned at the factory and should require no adjustment after installation Replace the bottom case of the transceiver Installation of FM Unit FM 1 Remove the bottom case of the transceiver see previous page Refer to Figure 2 on the previous page and lo cate
144. ransmit when the Tx Clarifier is on When the DSP is On this scale pro vides a relative indication of the band width currently set via the High Cut and Low Cut knobs Fink In this mode an arrow indicates which direction you should tune on CW in order to center an incoming tone on the zero beat point with your own sig nal When tuning in steps less than 10 Hz this scale will expand rapidly as you tune quickly but as you tune slowly you will be able to measure frequency steps as fine as 1 Hz thanks to the 1 Hz calibration dots on the Enhanced Tuning Scale This feature will be dis abled when tuning steps are 10 Hz or larger U 11 OF GUPT Function Select the number of Memory Channels in Group 1 Available Values 55 Default 55 All Memory Channels are in Group 1 by default Memory Group 1 may be left at 99 channels in which case there will be no partitioning of the Memory Sys tem Otherwise you may set any number less than 99 for inclusion in Group 1 if you wish to partition the memories U 12 GPDUPE Function Select the number of memories in Group 2 Available Values The last digit in Group 1 plus 1 is the bottom end of Group 2 99 maximum Default af F If for example there are 25 memories in Group 1 Group 2 starts at Memory 26 U 13 GFGUPS Function Select the number of memories in Group 3 Available Values The last digit in Group 2 plus 1 is the bottom end of Group 3 99 maximum
145. re on press the IPO key located just to the right of the Meter SELeEctT key on the left side of the front panel The IPO icon on the display will become illuminated and the background noise level should drop If you have reduced the setting of the RF Gain control previously you may need to ro tate it clockwise somewhat after turning on the IPO feature To re activate the receiver front end s preamplifier again press the IPO key again FT 920 Operating Manual 45 46 ATT Front End Attenuator Under conditions of extremely high signal levels the front end attenuator may be engaged either singly or in conjunction with the IPO feature to reduce re ceiver sensitivity Pressing the front panel s ATT key repeatedly causes the attenuator to cycle through the various levels of attenuation provided in 1 S Unit steps of 6 dB each 6 dB gt 12 dB gt 18 dB gt 0 dB gt 6 dB gt The 0 dB position of course represents the At tenuator Off configuration Digital Voice Recorder Operation DVR The FT 920 includes a built in Digital Voice Recorder which you can use to record and then replay the in coming signal from the VFO A path for a period of up to 16 seconds In addition the DVR may be used for storage and replay of repetitive CQ type mes sages in your voice See the section on Transmis sion page 50 for details of the latter feature Recording and playback of incomin
146. requency increases so a coaxial line with only 0 5 dB of loss at 7 MHz may have 2 dB of loss at 28 MHz For reference the chart below shows approximate loss figures for typically available coaxial cables frequently used in amateur radio in stallations Memory Backup The lithium memory Backup switch on the rear panel is turned on at the factory allowing VFO memory and menu data to be retained while power is off Backup current is minuscule so it is not necessary to turn the Backup switch off unless the transceiver is to be stored for an extended period After five or more years of operation the transceiver may fail to retain memories At this point the lithium battery should be replaced Contact your dealer for procurement of the battery and follow the instruc tions on page 91 for replacement of the battery Before completing installation of your FT 920 trans ceiver please take the time to review the following safety guidelines FT 920 Operating Manual Adjusting the Front Feet The two front feet of the FT 920 can be set in either of two positions By turning the knurled ring around a retracted foot clockwise the middle of the foot will extend about one centimeter Turn the ring as far as it will go about 1 turn to lock the extended foot in place To retract an extended foot turn the knurled ring counter clockwise 1 4 turn while pressing on the center of the foot ETT 1 0 FT
147. requency on each ama teur band These channels are labeled S 01 through S 11 O One set of band edge memories also known as Programmable Memory Scan channels labeled LO and HI These memories do not just store away the operat ing frequency thanks to the enhanced memory space provided in the FT 920 the following data will be stored into each memory channel O Operating frequency O Operating mode LSB USB CW etc O Receiving filter bandwidth O Clarifier information offset direction and mag nitude except on PMS and CALL channels Antenna jack selection O Automatic Antenna Tuner status On Off ex cept on QMB and CALL channels O Repeater Shift information except on QMB and PMS channels O Repeater CTCSS tone information except on QMB channels O Alphanumeric Labels except on QMB chan nels O Lock switch status except on QMB channels QO Storage and recall of memory channels in the vari ous memory systems is quite straightforward thanks to the advanced ergonomic design of the FT 920 These procedures are detailed below QMB Channel Programming Recall The QMB Quick Memory Bank memories are de signed for urgent operating situations where very simple storage and recall procedures are desired QMB Channel Storage While using VFO A tune in the desired frequency on the Main Tuning Dial Press and hold in for 2 second the QMB STO key until the double beep is h
148. res of continuous current For base station installations we recommend the matching Yaesu FP 1030A AC power supply which was specifically designed for compat ibility with your FT 920 You can of course use an other DC source so long as it is well regulated and meets the above voltage current specifications In any case be extremely careful to avoid reversed polarity connections when installing your FT 920 See the Caution box below If you are connecting the FP 1030A to the FT 920 before connecting power check the label on the rear of the power supply which indicates the AC line volt age range for which the power supply is currently set If your AC line voltage is outside this range the input voltage range will need to be re configured If you have any questions about the voltage setting for your power supply consult with your dealer before pro ceeding as improper connections could cause seri ous damage not covered by your warranty See the documentation accompanying your power supply for details on the exact procedure required for power supply AC voltage re configuration Connection of the DC line must be made according to the instructions below The Rep DC power lead connects to the Positive DC terminal and The Back DC power lead connects to the Negative DC terminal Make sure the FT 920 s Power switch is off and plug the DC cable into the 6 pin Molex jack on the rear panel of the transceiver fied rang
149. resented to the radio feedline losses will escalate rapidly with high SWR at the higher operating frequen cies especially 28 MHz and 50 MHz O Although high SWR itself does not cause feedline radiation the sudden onset of high SWR may well indicate a mechanical failure in a matching device leading to an electrical con dition which may cause excessive feedline ra diation which can cause interference to nearby home entertainment devices Every effort should therefore be made to ensure that the impedance of the antenna system utilized with the FT 920 be as close as possible to the specified 50 Q value Loss in dB per 30m 100 feet for Selected 50 Q Coaxial Cables Assumes 50 Q Input Output Terminations Loss 15 MHz Loss 28 MHz Loss figures are approximate consult cable manufacturers cata logs for complete specifications Loss figures can increase significantly if high SWR is present on the transmission line Any antenna to be used with the FT 920 must ulti mately be fed with 50 Q coaxial cable Therefore when using a balanced antenna such as a dipole remember that a balun or other matching balancing device must be used so as to ensure proper antenna performance Use high quality 50 coaxial cable for the lead in to your FT 920 transceiver All efforts at providing an efficient antenna system will be wasted if poor qual ity lossy coaxial cable is used Losses in coaxial lines increase as the f
150. rophone equalization pat tern if desired Available Values af F 1 2 Default af F This Menu Item allows you to tailor via the DSP the audio response of the transceiver to match your voice characteristics This focuses the available power of the transceiver into the frequency spectrum occupied by your voice thus increasing useful power output The choices are FF This function is disabled i Mid and high frequency components are enhanced with this setting fx A high emphasis response is produced ideal for pile up or contest work Both low and high emphasis responses are produced A wide bandpass response is produced emulating a broadcast microphone audio characteristic The DSP key on the front panel does not have to be on for this feature to work as On Off control is im plicit in the menu selections provided Use the Moni tor feature to select the audio response most suited for your voice 4 U 52 Li Tu Function Activate the Linear Amplifier Tuning pulser Available Values N A Default a F After selecting this Menu Item pressing the ENT key activates the pulser for a time duration established via Menu Item U 55 and the time remaining will count down on the U 52 status screen The characteristics of the pulser are set via Menu Items U 53 U 57 This feature may be ideal for inclusion as a Quick Menu item U 53 LI A PO Function Set the power output for the Linear Ampli fier Tu
151. rs provide convenient access to the receiver input line for a number of applications They are active only when the front panel RX ANT key is pressed The Out jack is connected to the RX lead from the main T R relay for the transceiver The IN jack is connected to the input port of the FT 920 receiver section Accordingly a separate receive only antenna ora VHF receive converter s 28 MHz output may be con nected to the In jack Alternatively a receive preamplifier s Input jack may be connected to the Out jack and the preamp s Output jack may be connected to the In jack See page 35 for interface instructions and ideas 16 Ant Jacks A B These SO 239 M jacks should be connected to an appropriate coaxial connector for the antenna or a 50 Q dummy load Antenna selection is made via the front panel ANTENNA A B switch 17 DC 13 5V Jack This is the main DC input jack for the transceiver The specified voltage is 13 5V DC negative ground at 20 Amps 18 GND Lug For best performance and safety this Ground Lug should be connected to a good earth ground using a short heavy braided cable FT 920 Operating Manual 33 34 The small adjustment hole shown in the drawing is used for adjustment of the Beep tone associated with front panel keystrokes eee FT 920 Operating Manual Before You Start Before you begin operation for the first time preset the front
152. ry A starting point on a band may also be established using direct entry via the Keypad This is accom plished using the Ent key as well as the individual numeric keys on the Keypad For the purposes of direct frequency entry use the numerals located on the lower right hand side of a particular key For example to set 24 905 33 MHz on VFO A press Ent 2 gt 4 gt 9 gt 0 gt 5 gt 3 gt 3 gt En7 Trailing digits which are identical or acceptable for the new setting need not be entered Therefore in the above example which began with the initial 12 meter band setting of 24 500 MHz to set 24 900 MHz on the VFO A register one can simply press Ent gt 2 gt 4 gt 9 gt En7 You can set the operating mode at the same time that you enter the frequency if you need to make that change To set VFO A to 14 011 52 MHz CW press Ent gt 1 gt 4 gt 0 gt 1 gt 1 gt 5 gt 2 gt CW gt Enr When entering a frequency below 10 000 0 MHz you must enter the leading Zero of the desired frequency That is to enter 7 255 00 MHz press Ent gt 0 gt 7 gt 2 gt 5 5 gt 0 gt 0 gt En7 VFO B Direct Frequency Entry Direct VFO B frequency entry using the Keypad again requires that the Gen CE key be pressed and held in for 1 2 second as described previously Then enter the desired frequency while the VFO B display area is blinking For example to set VFO B to 18 095 20 MHz CW mode pre
153. s pin not generally re quired for digital mode operation This pin is held at 5V when the squelch is open and is grounded when the receiver is muted by the squelch no signal condition Key Jack Rear Panel If you wish to send CW using your TNC and com puter keyboard the CW Key output line from your TNC may be connected to the rear panel Key jack according to the connection information provided on page 5 Since a TNC s keying output is electrically similar to that of a Straight Key set the rear panel s PpoL Key switch to the Pot Manual Key position and connect the TNC s key line there You can still connect your keyer paddle to the front panel Key jack and use the FT 920 s built in electronic keyer for those situations where you wish to send using the paddle there is no need to switch the internal keyer on and off BATA JACK TNC Pin 1 lt gt DATA OUT Pin 2 lt gt GND Pin 3 lt PTT Pin 4 lt gt LATA IN Pin 5 gt NG E FP 1030A FTT DATA GUT DATA IN ET Supplied DC Cable FT 920 Operating Manual 3 Other Digital Recording Device Interfacing AF Our Jack This is a 3 5 mm miniature phone jack which pro vides constant level 100 mV 600 Q for connec tion to a WeatherFax decoder tape recorder or other accessory The audio output level is not affected by the setting of the front panel
154. s as seen from the transmitter s perspective resemble curve 1 in the graph below If you QSY to frequency 2 in the chart where the SWR is above 3 1 the tuner will be automatically activated when you begin to transmit D The automatic antenna tuner has 100 dedicated tuner memory registers of which eleven are allocated one each to the amateur bands covered by the FT 920 The other 89 record the most recent tuner settings irrespective of the band in use on a first in first out basis E The automatic antenna tuner is configured at the factory to be engaged both on receive and transmit It is possible however to configure it so that the tuner is only active on transmit See Menu Item U 48 described on page 79 F The automatic antenna tuner only adjusts the apparent SWR as presented to the transceiver No adjustments made by the tuner can of course affect the SWR present on the coaxial feedline There fore every effort should be made to minimize SWR so as to ensure efficient power transfer to the antenna feedpoint since feedline losses may escalate rapidly as SWR increases G Because the impedance of such antennas varies widely depending on the band in use please note that random length long wire and center fed flat top antenna systems generally will not be satisfactorily tuned by the FT 920 s automatic antenna tuner unless you make design provi sions for ensuring that the impedance stays within the specified range of 16 5 15
155. s of data when you request a download of data This delay is set to zero initially but reset ting it to a higher value will allow slower comput ers to read and process data returned by the ra dio However the download time will be signifi cantly increased if a high value is used in this command s P1 argument These Opcodes are detailed below Status Update 10H Depending on the value of parameter P1 this com mand will return e One byte containing the current Memory Channel Number P1 01 e Two 14 byte records of the current operating frequency VFO or Memory P1 02 e One each 14 byte record for VFO A and VFO B P1 03 or e One 14 byte record of Memory Channel data P1 04 When P1 is set to value 04 parameter P4 may be set to a hexadecimal value between 00 and 89 to prompt the transceiver to download frequency infor mation on any of the memories as shown in Note 7 on previous page So P1 04 instructs the radio to download memory data and P4 s value defines which memory channel s data is to be downloaded The format for the 14 byte frequency data records is shown at the end of this sub section Status Flags Request FAH The format for the eight Status Flags is shown be low 8 Byte Status Flags Record Table FT 920 Operating Manual Bit Offset Status Flag Byte 0 Contents Bit Offset Status Flag Byte 1 Contents Bit Offset Status Flag Byte 2 Contents 0 Spli
156. section You now only have access to the Quick menu Items O To gain access to the other Normal Menu Items press Menu and hold it in for 1 2 sec ond instead of pressing it momentarily After you have done one of the above actions with the Menu key operation is identical to that described in the Normal Menu Operation section The Quick Menu bank is set up by first accessing Menu Item U 67 via Normal Menu operation For il lustrative purposes we shall create a Quick Menu bank consisting of Menu Items U 01 U 02 and U 03 Press the Menu key momentarily to enter the Menu mode Rotate the VFO B Tuning Dial to select Menu Item U 67 The Title for this item is Q MENU and the default value is U 01 OFF Press the Ent key to enter the Menu Item Com mand mode The U 01 oFF display will blink Now press the Up A key to change the oFF to on relative to U 01 Rotate the VFO B Tuning Dial to select Menu Item U 02 Again press Up A to change the oFF to on Rotate the VFO B Tuning Dial to select Menu Item U 03 Again press UPA to change oFF to on Press the Ent key to lock in the new settings for U 67 then press Menu to exit Now press Menu momentarily and rotate the VFO B Tuning Dial You will see that you have access only to Menu Items U 01 U 02 and U 03 Press Menu to exit Press and hold in the Menu key for
157. ss Gen CE hold for 12 sec gt Ent gt 1 gt 8 gt 0 gt 9 gt 5 gt 2 0 gt CW Ent f you attempt to enter a frequency outside the operating range of the transceiver the attempt will be ignored and the transceiver will revert to the last frequency you were on before the attempted frequency entry Stacked VFO System The FT 920 provides two VFO registers on each band for each Tuning Dial A and B These dual regis ters are most often use to establish favorite fre quency presets in each Amateur band In the previous VFO A example of direct frequency entry for example we set up VFO A on 7 255 MHz Now press the 7 key momentarily You will observe that 7 255 00 has disappeared and another 7 MHz frequency probably 7 000 00 MHz is now displayed You may now retune this VFO register to any desired frequency It may be desirable for example to set the new VFO register to 7 025 MHz CW so you have one CW frequency and one SSB frequency in each band All settings of the frequency mode bandwidth an tenna selection and antenna tuner adjustment are totally independent between the two registers on each band so changing one VFO register s bandwidth for example will have no effect on the alternate register s settings Two VFO registers per band are also provided for VFO B Just remember to push and hold in the Gen CE key for 1 2 second before pushing the 7 key to insp
158. st dash in the VFO B display area will now blink signaling you that Alpha Numeric entry may be gin Rotate the VFO B Tuning Dial to select the letter or number you wish to enter into the first Label slot You may also use the Banp keys by press ing repeatedly on a particular key until one of the letters or the number stamped on the key appears for example repeatedly pressing the 7 MHz key toggles between D gt E F 3 Rotating the VFO B Tuning Dial is usually faster however After you have chosen the first letter digit for the Label press the UPA key A blinking dash will appear to the right of the first digit Choose the next letter digit as in the previous step Press the UPA key to advance the entry position as you fill up the Label register up to a maximum of seven characters When entry is complete press the Ent key You will hear a double beep which confirms that the Label storage process was successful If you make a mistake during entry you may use the Down key to step backward through the Label field If you wish to leave a blank space just press the UPA key without choosing a let ter To create a space where a letter digit exists from a previous entry the character one incre ment counterclockwise from the A on the VFO B Tuning Dial will inject a space you may also use the third selection on the 50 MHZ key _ if you prefer keyboard entry Press the Dis
159. st receiver recovery time return to beginning of loop The current receiver recovery time constant is shown on the display panel f AGC Orr is selected the S meter which moni tors AGC voltage will cease to function 11 Mic Gain Control This control adjusts the microphone input level in the SSB and AM modes Clockwise rotation increases the microphone gain level 12 RF Pwr Control This control adjusts the transmitter s power output with a range of 10 100 Watts and adjustment is available in all modes Clockwise rotation increases the power output 13 AF Gain Control This control adjusts the receiver volume level pre sented to the speaker or headphones Clockwise ro tation increases the volume level Note that this control does not affect the audio level presented to the rear panel AF Out and Data jacks 14 RF Gain Control This control adjusts the gain of the receiver s RF and IF stages Clockwise rotation increases the RF Gain level for best sensitivity and the normal operating position for this control is fully clockwise Counter clockwise rotation of the RF Gain con trol besides lowering the receiver gain level will cause the S meter to deflect upward as though a strong signal were present 15 Narrow Switch This switch is used to activate optional narrow filters for improved interference rejection Press this switch to select the narrow filter the Nar indica
160. stallation Pin 1 AFSK Input Connect this pin to your TNC s AFSK Out or Mic Audio output line The optimum input level is 30 mV rms and the input impedance is 3 kQ Your TNC s audio output level potentiometer will allow you to set the level to the optimum value This pin may be used either for 300 baud SSB mode digi tal operation or for 1200 baud FM packet The bandwidth and frequency response are not how ever suitable for 9600 baud operation Be sure the AFSK FSK switch on the rear panel is in the AFSK position For FSK operation whereby the TNC closes a line to ground to accomplish teletype keying set the AFSK FSK switch to FSK and connect your TNC s FSK keying line to Pin 1 AFSK FSK oo ANTENNA B oo ANTENNA A Set the AFSI FSK Switch to AFSK FT 920 S e 5 pin DIN Pliug Y amp Option P N P0091066 Pin 2 Ground Connect this to the shield s of the cable s used for connections between the TNC and the FT 920 Pin 3 PTT Connect this pin to the PTT line from the TNC This pin when grounded by the TNC places the FT 920 into the Transmit condition Pin 4 Audio Out Connect this pin to your TNC s RX Audio input line This is a constant level 100 mV rms 600 Q audio output line which is not affected by the position of the front panel AF Gain control Pin 5 BUSY This is a Squelch Statu
161. switching circuitry transistor or relay of the FT 920 made available via the Bano or Tx GND jacks Your warranty does not cover damage caused by improper interconnections to linear amplifiers When in doubt it is always safest to utilize the Tx Gnp jack with the Tr Ry switch set to Tr as this configuration should handle the switching requirements of most all com monly available amplifiers FL 2100Z move TR RY switch ta G on s ANTENNA B 90000 lannna DOO0DGU GND DC 13 5V TX GND IE a gam en oe i r Supplied BC Cable FT 920 Operating Manual 15 2 Digital Modem Interfacing TNC WeatherFax etc The FT 920 provides several convenient interconnec tion points as well as dedicated operating modes for digital operation While interfacing to commonly available modems is simple and straightforward it is important that you read the instructions below so as to understand the facilities that are provided on the FT 920 DATA Jack This five pin DIN connector is the primary interface port for most digital mode operation It provides the following connection points which may be required in your in
162. t kHz This Menu Item sets the scanning steps for FM work when the FAST synthesizer step mode is selected It allows the radio to be used in a channelized mode according to the channel spacing utilized in your coun try U 69 Cno NAR Function Enable Disable the signal path through the optional YF 116C CW filter Available Values ain aF F Default af F When the CW filter is installed the signal path must be enabled or the FT 920 will not know that the filter is there Conversely if the filter is not installed erroneously setting this Menu Item to a7 will re sult in a dead receiver if the Narrow key is pressed during CW operation U 70 AM WITE Function Enable Disable the signal path through the optional YF 116A AM filter Available Values aini aF F Default af F When the AM filter is installed the signal path must be enabled or the FT 920 will not know that the filter is there Set this Menu Item to 1 to enable the signal path to the Wide filter The stock 2 4 kHz SSB filter then becomes the Narrow filter during AM operation U 71 AUTOTUN Function Enable Disable automatic retuning of ATU settings when SWR increases Available Values aini aF F Default 9 This feature instructs the Automatic Antenna Tuner to re adjust its settings without operator intervention should the SWR present at the antenna jack increase above a value of 3 1 U 72 FAST
163. t Operation active with VFO B on TX 5 second Memory Check countdown in progress 0 Fast Tuning is active 1 Split Operation active with VFO B on RX 1 Antenna Tuner is in line 2 Antenna Tun er On tuning Dual VFO Tracking active 2 VFO B is locked 3 R System operation in progress Quick Memo ry Bank QMB selected 3 VFO A is locked 4 VFO B In Use both TX and RX on VFO B Memory Tuning in progress 4 Squelch is closed 5 Direct Keypad Entry in progress VFO Operation selected 5 Up scanning is active 6 VFO A is Muted Memory Mode selected 6 Scanning is paused 7 Transmission in progress PTT line g rounded General Coverage Reception active 7 Scanning is active Bit Offset Status Flag Byte 3 Contents Bit Offset Status Flag Byte 4 Contents Bit Offset Status Flag Byte 5 Contents 0 Not Used 0 RTTY space TX Idle 0 VFO A is muted 1 Alpha Numeric Memo ry Lavel selected Not Used it VFO B is muted 2 Not Used All Front Panel Controls locked 2 Not Used 3 Linear Amplifier Tuning Pulser active Group Memory Mode active 3 Tx activated via Spot switch command 4 PTT grounded via R command Antenna B selected 4 Not Used 5 Transmit Inh ibit is active Rx Antenna selected 5 Not Used 6 Key Release Timer actve Not Used 6 Antenna Tuner s Wait light is on 7 PTT inhibit Not Used iz High SWR detected Bit Offset Status Flag Byte 6 Contents Bit O ffset Status Flag Byte 7 Contents 0 Dual Watch active Not Used i Rot Used 2 Quick Menu Mode active CTCSS Tone Burst active 3 BUS Y l
164. tening level on the incoming background noise We will now discuss antenna selection frequency navigation and other aspects of FT 920 operation Antenna Selection Two main antenna jacks are provided on the rear panel of the FT 920 allow ing you to connect for ex ample a triband Yagi to one jack and a multiband dipole or vertical to the other oo These SO 239 or M type jacks labeled A and B may be selected by pressing the Antenna A B switch on the left side of the transceiver s front panel This switch toggles between the two available main an tenna ports ANTENNA Note that the maximum power output for each an tenna jack may be set independently via Menu Items U 49 Antenna A and U 50 Antenna B See page 79 for details An additional receive only antenna jack RCA type may also be found on the rear panel of the trans ceiver labeled Rx In This jack may be connected to a specialized antenna such as a loop or Beverage for use in the receive mode transmission will remain on the previously selected A or B antenna if a re ceive only antenna is used FT 920 Operating Manual 35 36 To engage the receive only antenna press the Rx ANTENNA Switch located immediately under the A B switch just described Press the Rx ANTENNA switch a second time to return receive operation to the main transmit antenna A or B MI The antenna selection A B and or Rx will be maintained in th
165. tentiometer FT 920 Operating Manual Receiver Accessories Noise interference changing signal characteristics and changing propagation can all present difficult challenges to today s operator The FT 920 however provides a wealth of features designed to enhance reception on our crowded bands These features are described below Clarifier Offset Tuning The Clarifier feature allows offset tuning from the current VFO frequency The Clarifier provides sev eral important capabilities O If the incoming signal begins to drift the RX Car may be activated so as to allow you to continue receiving the other station without requiring you to adjust both your transmit and receive frequencies possibly causing interfer ence to other nearby operators O For DX pileup operation the TX Clar may be used to establish a split TX RX frequency relationship and the RX CLar may be used to establish an optimum calling frequency O If you frequently need to move a fixed amount of frequency excursion such as five up the TX RX Cuar control allows you to program this amount for instant recall and QSY to that frequency Press the RX Cuar key to activate the Receive Clari fier The RX Cuar indicator will appear on the display and the VFO B Tuning Dial may now be used to move your receive frequency up to 9 99 kHz If you want the transmit and receive frequencies to follow the programmed offset also push the TX Car key
166. the gain of the MOS FET amplifier below about 7 MHz accordingly we do not recom mend these amplifiers be used outside of the recom mended frequencies U 48 ATURE Function Enable Disable the use of the Automatic Antenna Tuner in the Receive mode Available Values a F Default aF F Engaging the Antenna Tuner in the Receive mode helps protect the receiver circuitry from strong out of band signals it acts as an additional bandpass fil ter ahead of the fixed bandpass networks already protecting the receiver There is a very slight reduc tion in sensitivity when this feature is ON which should prove insignificant in everyday operation U 49 A MAXPD Function Set the maximum power level for the A antenna terminal Available Values HORHE Default 221 This convenience feature allows you to limit the power applied to the A antenna port in case you wish to excite a low drive linear amplifier for example You may use the other antenna port for full power opera tion of course U 50 3 MAKPD Function Set the maximum power level for the B antenna terminal Available Values HORHE Default i This convenience feature allows you to limit the power applied to the B antenna port in case you wish to excite a low drive linear amplifier for example You may use the other antenna port for full power opera tion of course FT 920 Operating Manual 80 U 51 MIC EQ Function Set the DSP mic
167. the mounting positions for the FM 1 on the Main Unit Refer to Figure 5 and push the optional FM 1 board onto the pins corresponding to its assigned mounting location on the radio Gently press the board down until it is firmly seated in its connec tors Installation is now complete as the FM 1 has been carefully aligned at the factory and should require no adjustment after installation Replace the bot tom case of the transceiver E 19 i ol s ad Figure 3 i he ne place eel erie Gey ma EM I B in Figure 5 a I FT 920 Operating Manual CAUTION Changes or modifications to this device not expressly approved by Yaesu Musen could void the user s authorization to operate this device 1 This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference including interference that may cause undesired operation 2 The scanning receiver in this equipment is incapable of tuning or readily being altered by the User to operate within the frequency bands allocated to the Domestic public Cellular Telecommunications Service in Part 22 This device complies with RSS 210 of Industry Canada Operation is subject to the following two condition 1 this device not cause interference and 2 this device must accept any interference including int
168. the pitch of the station being worked by DX1DX with the pitch of your radio s Spot tone this action will place you exactly on the frequency currently being received by DX1DX Now press the RX Cuar key again to turn off the Receive Clarifier You will now be back on 14 024 00 MHz listening for DX1DX to send QRZ When you transmit you will be approxi mately on 14 029 MHz depending on how far you adjusted the offset so as to zero in on the station being worked by DX1DX If you don t work DX1DxX after one or two calls again press the RX Cuar key and look around for the station being worked by DX1DxX then press RX Cuar again to return to 14 024 00 MHz for receiving DX1DX FT 920 Operating Manual 53 Split VFO Operation Some pile ups especially on SSB involve a split greater than 9 99 kHz In these cases use the two VFOs on the FT 920 for split frequency operation Example DX1DX is on 7 095 0 MHz listening 210 to 220 7 210 7 220 MHz for replies With the Clarifier s off and TX RX control on the Main Tuning Dial tune in DX1DX on 7 095 0 MHz Press and hold in the A 4 B key for 1 2 sec ond then rotate the VFO B Tuning Dial to set VFO B somewhere between 7 210 and 7 220 MHz pressing A B ensures that both VFOs are on the same operating mode Press the VFO B TX indicator which will glow Orange after you press it This indicates that VFO A is in charge of the receive frequency
169. this manner we recommend that you not connect the ALC line and rather let the amplifier s protection circuitry manage its ALC requirements internally One useful alternative to ALC interconnection may be considered by entering Menu Item s U 49 and or U 50 you may define the maximum power output for the FT 920 So if your amplifier never requires more than 50 Watts of drive just set the maximum power output to 50 via the menu system and you will not have to worry about over driving your ampli fier And since the power output may be set indepen dently for each antenna port use Menu Item U 49 for Antenna A and U 50 for Antenna B you may lower the power output on a port connected to your amplifier while retaining the full 100 Watts on the other antenna port Interconnection with QSK Amplifiers If using a Yaesu FL 7000 amplifier connect the op tional cable CT 11 from the transceiver Banp jack to the amplifiers ACC 2 jack This provides automatic band selection for the linear as well as QSK Tx Rx switching control and sequencing Also connect an RCA to RCA patch cord Yaesu Part T9101296 supplied with the FL 7000 from the amplifiers ALC jack to the transceiver s Ext ALC jack and connect an RF coaxial jumper Yaesu Part T9100980 also supplied with the FL 7000 from the transceiver s antenna jack A or B to the amplifier s RF Input jack If using another manufacturer s QSK amplifier and if it meets th
170. tion 0 0000 ee 1 Lineae Amplifier Interfacing 2 Digital Modem Interfacing TNC WeatherFax etc 16 3 Other Digital Recording Device Interfacing 17 4 CW Key Paddle and Computer Keying Interface Suggestions eceeeeeeeeees 18 Front Panel Controls Switches amp Jacks 20 Display Panel Indicators and Icons eee Rear Panel Connectors and Switches Bottom Panel cc ccccsssssecccesssssesessseecesesssnseseesss Op ration ainena aa a a mane e Before You Start Receiving iiin nnda irdd aita Antenna Selection seeen 35 Bandwidth Selection Amateur Band Selection s es 37 Direct Keypad Frequency Entry cee 38 Stacked VFO System n se 38 Frequency Navigation 38 VFO Tuning Dial 39 Shuttle Jog VFO A seee 39 Front Panel Up Down Switches 0065 39 MH 31B8 Hand MicUr DwNF st Switches 39 MD 100A8X Desk Microphone Rotary Scanning Switch 0 39 Lock Switches ssec 39 Operating Convenience Features 40 Display Brightness Control 40 Keypad Beep Frequency Level 40 Receiver Accessories seese 41 Clarifier Offset Tuning ss sseseesneseeeeeeeeeneeee 41 CW Center Tuning Enhanced Tuning Scale 41 GW SPOR seeski ia eaaa e e ae aa 41 RF Preamplifier Selections 00 0 0 cece 41 AGC Selection j Squeleh aa a Ar A NR General Coverage Re
171. tion level of the display use the following procedure Press the Menu key to enter the Menu mode of operation Rotate the VFO B Tuning Dial to select Menu Item U 08 Dimmer Press the Ent key to enter the Menu Com mand mode Rotate the VFO B Tuning Dial to change the setting indicated in the main display window from Orr to On Press the Menu key once more to exit the Menu mode and resume normal transceiver operation Keypad Beep Frequency Level The Beep tone which is heard when you press a key on the front panel may be adjusted if you like To adjust the Beep Frequency Press the Menu key to enter the Menu mode of operation Rotate the VFO B Tuning Dial to select Menu Item U 06 B eer F Press the Ent key to enter the Menu Com mand mode At this point the current beep tone frequency will be heard Rotate the VFO B Tuning Dial to set the tone that you prefer Just for your information the exact tone frequency will be shown on the main display window Once you have found a satisfactory tone press Ent to exit the Menu mode and resume nor mal operation To set the Beep Level you may adjust the Beep level potentiometer which is accessible through a small adjustment hole on the bottom of the transceiver Use a small insulated flat blade alignment tool to set the level to the best amplitude for your operating needs Beep level po
172. tions in use today However the FT 920 and other Yaesu products are widely supported by third party software packages and we recommend that you contact your dealer for advice or check advertisements in ama teur radio journals Most software vendors also have Home Pages on the World Wide Web containing a wealth of information on the features and radio sup port for their software packages The information presented in this section will allow the programmer to understand the command struc ture and opcodes used in the FT 920 s CAT Sys tem Opcode Command Chart Com mand Title SPLIT On Off 01H Recall Me mory 02H Memory Operations 03H Recall VFO 05H P1 XX Copy Memory Data to VFO A 1 Clarifier Op erations 7 Set VFO A Frequency OAH Mode Setting OCH Update IntervalPacing aa has 10 Status Update 10H Keyer Commands Ga X P 00 FF H in 1 ms steps Adds delay between each byte of all downlo aded data from the FT 920 See Note 7 W Tuner On Off Tuner Start XX 14 Repeater Shift See Note 8 P1 00 Off P1 01 On 0 81H 8 15 Set VFO B Frequency Bandwidth 8 17 Tone Frequency P P See Note 10 18 Read Meter EH 70H 82H 84H AH CH 90H F7H A Read Status Flags F z fi a oaf oa 7a o XX XX 1 XX XX XX P2 XX 2 XX XX of x See Note 11 x See Note 12 e FT 920 Operating Manual XX XX XX XX P1 00 SIMPLEX P1 01 Minus Shift P1 02 Plus Shift See Note
173. tionship will not be changed by the action in the previous step That is if the Tx frequency was originally stored via VFO A and the Rx frequency stored via VFO B that relationship will remain unchanged after the Memory to VFOtransfer process a channel by mistake using this procedure the memory channel contents can be recovered First use the UPA or Down key or the VFO B Tuning Dial from the Memory mode to select the memory channel containing the data to be deleted Next press and hold in the V gt M key for second until you hear the double beep At this point the memorized frequency and other data will disappear The data is now masked and will not be available for operation To restore the masked frequency data repeat steps and above However if you store new frequency information on a channel containing masked data the masked data will be over writ ten and lost Deleting Data from a Memory Channel Frequency data stored on a memory channel can be deleted from a memory channel if desired The de The FT 920 contains a wide variety of scanning ca pabilities Whether you are in the VFO mode or one of the Memory modes scanning operation is funda I FT 920 Operating Manual 65 mentally identical in all modes of operation but with the following differences O In the VFO mode scanning causes the trans ceiver to sweep up or down the band pausing or halting on any signal encounter
174. tor will ap pear on the display panel 16 Mope Switches Pressing one of these switches selects the operating mode Per the chart below repeated presses of a particular switch may cause the precise mode to be selected from within a mode group for example pressing SSB repeatedly toggles between USB and LSB Switch Available Mode Selections LSB gt USB FM DATALSB gt DATA USB gt DATA FM gt DATALSB gt RTTY FSK PKT AFSK PKT AFSK RTTY FSK FT 920 Operating Manual 17 18 26 28 27 POWER OK 7 A fy f mox vox f JCJ YAESU HF 50MHz TRANSCEIVER i siet iba aT e yas splay ane ame We C D a A D ANTENNA Ure J bal L i Tne MIC GAIN AZDAN A Cart aw vem mv Al A A N Lowe oMa AND O ir l Ji ac Pa a Pral aa boag AL SL te 1 ue 2 aa pK RA EX F PN 3F WR REGAN NEROW Ze ow a x s ines Cy PN IN A bac Js AS A N L a YL REC PE Of tiw aj wej bmc Sab Sehr a Pace of OT He A JUE a 4 ANS EN Wee a j SaL CGM RUC SAN MONI LEv zL ere 20WN UP s MENU oy Ge A ABAF i y SY 9 HATOWC SNe OO iz ele RX AS s 6 o 20 22 24 19 21 23 25 17 18 Antenna Switches A B RX These switches allow selection of antennas
175. ucing interference in RTTY pile up situations A typical setting of the High Cut con trol is at approximately 1 o clock while the Low Cut control may be set approximately to 11 o clock The CW Narrow filter may also be used for AFSK operation Just press the Narrow switch then rotate the Suirt control to peak the signal in the narrowed IF passband Via Menu U 10 the Enhanced Tuning Scale may be engaged so as to allow a visual representation of precise tuning pursuant to the tone frequency selected via Menu U 46 However since your TNC may also have such a facility and because the TNC is ultimately in control of the tone gen eration and decoding you may wish to rely on the TNC s tuning indicator and use the Enhanced Tuning Scale of your FT 920 for other purposes For 1200 bps FM packet press the Data key until Data and FM appear on the display FSK RTTY Operation This mode utilizes the tone generator in the FT 920 for production of the required Mark and Space tones used for RTTY operation Follow the interconnection guidelines on page 17 for details on how to hook up your terminal equip ment to the transceiver Be certain to set the AFSK FSK switch on the rear panel of the trans ceiver to FSK In this mode of operation closing Pin 1 of the Data jack to ground causes the car rier to shift the magnitude of the shift 1 70 425 850 Hz is set via Menu U 43 while the carrier s offset from z
176. ues ff J000 ms Default fifi ms A lower value set in this Menu Item reduces the duty cycle of the transceiver amplifier during linear ampli fier tune up FT 920 Operating Manual U 58 RLS ACAR Function Set the Rx Available Values 331 Dafault H L Changing this value is analogous to rotating the IF SHIFT control allowing you to preset the frequency response of the receiver during LSB operation The effect of the adjustment can be heard if you turn the volume up while rotating the VFO B Tuning Dial to adjust the setting arrier Point for LSB co 500 kHz U 59 TLO SLAP Function Set the Tx Carrier Point for LSB Hi m ITI mMM L Available Values u3un uauu kHz Dafault H L This is the same function as that of Menu Item U 58 as applied to your voice response on LSB Tx The effect may be difficult to discern however depend ing on the settings of the TX Equalizer via Menu Item U 51 U 60 PPOCLSI Function Set the Tx Carrier Point for LSB when the Speech Processor is on Available Values 0 3 Dafault 2 000 This is the same function as that of Menu Item U 59 but is applied to your voice response on LSB Tx when the Speech Processor is on Therefore it is possible to set two different response characteristics for your voice one for Processor On and one for Processor Off U 61 FUSS FTAR Function Set the Rx Ca rv rrier Point for USB Available Values f 300
177. ugh for QSK full break in CW operation maximum ratings for the re lay contacts are 220 V DC maximum at 270 mA 30V DC at 2 A or 125 V AC maximum AC voltage at 500 mA 60 Watts total maxi mum dissipation The relay s contacts may be accessed by con necting a shielded cable to the rear panel Tx Gnn jack If the relay is being used the Tr Ry switch ad jacent to the Tx Gnp RCA jack must be set to the Ry position conversely if you are using the transistor switch leave the Tr Ry switch in the Tr position so as to eliminate the clicking of the relay The relay provides a mechanical closure to Ground on Transmit while the NPN transistor switch sinks its open collector to Ground on Transmit Check with the manufacturer of your amplifier or other de vice to confirm the amplifier switching voltage and current if they are not clearly stipulated in the docu mentation for your equipment M Be absolutely certain to check the position of the Tr Ry switch prior to connecting any external de vice to the Tx Gnn jack Never connect an AC voltage or a negative DC voltage to the Tx Gno jack if the TR Ry switch is set to Tr The Limited Warranty on this product does not cover damage caused by improper connections excessive or im proper voltage to the rear panel jacks of the FT 920 About ALC The FT 920 provides an external ALC jack on the rear panel RCA type jack for input of Automatic Level Control voltage from a l
178. une up pulse transmission by pressing ENT again or exit to normal operation by pressing Menu The duration of the tune up time may be adjusted via Menu Item U 55 The length of the transmitted pulses is adjusted via Menu Item U 57 default 100 ms while the interval between pulses may be adjusted via Menu Item U 56 default 100 ms You therefore can adjust the duty cycle to your requirements You may wish to reduce the interval time via U 56 to a very low value such as 10 ms so as to make the transmitted pulses resemble a continuous carrier The power output used during this tune up proce dure can also be set independently for the Antenna Aport and the Antenna B port The power output used during this tune up procedure not during regular operation may be set via Menu Item U 53 Antenna A or U 54 Antenna B The FT 920 provides a wide variety of memory sys tem resources These include O 99 standard memory channels numbered 01 through 99 FT 920 Operating Manual O Five QMB Quick Memory Bank channels providing one touch storage and recall of prime operating frequencies The QMB channels are labeled C 1 through C 5 O Ten Split Frequency memory channels used for storing frequency settings when the trans mitter and receiver frequency are different The Split channels are labeled d 01 through d 10 O Eleven Call channels for storage and quick recall of one prime f
179. urst use Menu Item U 36 see page 77 O To set your FT 920 s transmitted CTCSS tone Menu Item U 35 36 must be set to Conti use Menu Item U 37 see page 78 O To set your FT 920 s CTCSS Decoder CTCSS tone use Menu Item U 38 The default value is Off which means that Tone Squelch CTCSS Decode operation is not engaged Set this Menu item to the appropriate tone so as to keep your receiver quiet until the match ing tone is received from the repeater O To set the 29 MHz repeater shift use Menu Item U 39 see page 78 O To set the 50 MHz repeater shift use Menu Item U 40 see page 78 One press of the RPT key will have set the FT 920 for Minus Shift operation In this situation you will observe both the and RPT indicators on the display If your repeater uses a positive shift instead of negative press the RPT key again the indicator will replace the indicator on the display while RPT will remain illuminated The majority of repeaters on the 29 and 50 MHz bands use shift Set the FT 920 s receiver to the repeater output downlink frequency Close the PTT switch and speak into the micro phone You will observe that the transmitted fre quency has shifted according to the setting of the RPT key Release the PTT switch to return to the receive mode Since FM is a continuous duty mode we recom mend you rotate the RF Pwr control
180. when it finds a signal and lock on that fre quency without resuming the scan at some point The scan resume choices may be selected via Menu Item U 15 SCN STP see page 75 for details Scanning is chiefly useful in the FM mode when you are monitoring a number of repeater or simplex chan nels When operating on the 50 MHz band the num ber of channels per second may be adjusted via Menu Item U 19 the default value is 10 channels per sec ond When scanning in a narrow band mode such as SSB or CW a signal may occupy a number of synthesizer steps over its entire bandwidth Tuning across a CW signal in for example 2 5 Hz steps will take a con siderable amount of time at 1 step per second espe cially if the signal is strong But until the signal is fully passed the squelch will stay open thinking that it is finding a new station every 2 5 Hz Therefore when scanning a band in anticipation of a band opening you may wish to press the FAST key and reduce the Pause Time Menu U 16 to about 1 second so as to reduce the holding time on a signal which is encountered Dual Watch is similar in some respects to scanning In Dual Watch however the transceiver monitors squelched on the Main Rx frequency typically VFO FT 920 Operating Manual 68 A while periodically checking the Sub VFO typically VFO B for activity A typical example might be for you to set VFO A to 50 110 MHz watching for DX stations who might ca
181. while VFO B is controlling the transmit fre quency Inthe same manner as you did in the TX CLar example previously you may press the VFO B RX indicator so as to listen to the pile up If you find the station being worked by DX1DX tune quickly onto that station s frequency then press the VFO A RX indicator to return re ceive frequency control to VFO A so you can listen for DX1DX to say QRZ When operating Split via any means in pile up situations be absolutely certain not to press the VFO A TX indicator accidentally as this will make you transmit on the DX station s frequency caus ing interference to others trying to work the DX Quick Split Feature A user programmed Quick Split may be utilized to provide a starting point for split operation For ex ample if many of your DX pile up operating situa tions require you to transmit 5 kHz higher than you are receiving this feature may be useful to you Here is the procedure for activating Quick Split Press the Menu key to enter the Menu mode Rotate the VFO B Tuning Dial so as to select Menu Item U 04 Press the Ent key to enter the Menu Com mand mode Now rotate the VFO B Tuning Dial to select 5 0 kHz or whatever Tx Rx split you desire Press the Menu key once more to exit the Menu mode While operating with both Tx and Rx control from VFO A press the A B key You will observe that Tx control has been shifted to
182. your power supply This potential sus ceptibility is not unique to the FT 920 and the prob lem can usually be solved by directly grounding the Negative DC terminal to the power supply chassis which can then be bonded to earth ground check first with the power supply manufacturer though to be certain that this grounding technique is accept able to them Do not make ground connections from one electrical device to another and thence to the ground bus This so called Daisy Chain grounding technique may nullify any attempt at effective radio frequency ground ing Inspect the ground system inside the station as well as outside on a regular basis so as to ensure maximum performance and safety FT 920 Operating Manual Antenna Considerations The FT 920 is designed for use with any antenna system providing a 50 resistive impedance at the desired operating frequency While minor excursions from the 50 Q specification are of no consequence the transceiver s Automatic Antenna Tuner may not be able to reduce the impedance mismatch to an acceptable value if the Standing Wave Ratio SWR present at the Antenna jack is greater than 3 1 Among the undesirable consequences that high SWR may produce are O The transceiver s power amplifier protection circuitry will reduce power if the Automatic Antenna Tuner is unsuccessful in reducing the SWR O Even if the Automatic Antenna Tuner success fully normalizes the impedance p

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