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Kenwood TS-480 Marine Radio User Manual

1. lt a 5 1 BLOCK DIAGRAM GENERAL The block diagrafl Of TS 820 is shown on page 24 The transceiver is composed of the single superheterodyne receiver and the single conversion type transmitter with a fil ter type SSB generator It uses 8 830 kHz IF and its local oscillator is equipped with a PLL phase locked loop circuit controlled by VFO Both the receiver and transmitter use balanced type mixer circuits with dual gate MOS FET s thus minimfzing spurious during transmission and preventing the effects of strong signals and suprious signals during recep tton Taking full advantage of PLL system the transceiver offers IF SHIFT functlon electronic system pass band tuning1 and permit one SSB filter to provide the same effect obtained by US8 and LSB filters The transcetver also includes a number of latest accessory circuits such as the RF speech processor the digital display circuit option transmit monitor circuit etc TRANSMITTER SECTION The microphone signal is fed to the IF unit amplified by the microphone amplifier and is then fed to the ring modulator composed of 4 diodes The DSB output from the modulator passes through buffer amplifier and the crystal filter The SSB signal thus obtained is further amplified and fed to the
2. lt lt lt c st a a a aa i SECTION 7 TROLIBLESHOOTING i lt lt S S c n ns snn 7 1 GENERAL INFORMATION general b y improper operation or connection o f the trans ceivcr n o t b y defcctcve componcntr Thcrc i s a reparall The problem5 dercribed i n thir table are f a l u r e r caured in rervice manual for repair o f the TS 820 7 3 RECEIVER SECTION 7 2 TRANSMITTER AND RECEIVER CIRCUITS 1 I SYMPTOMS CAUSE Signal reports o f o f f frequency operation 1 Calibrator requires allgnrnent 1 See Secton 6 3 even though he dial scale ir calibrated SYMPTOMS Pilot llghrr d o not light and theye is no receiver noise when the POWER r w i l c h ir turned on Frequency difference between transmit and receive FMing on sideband operation V F O lor F I X indicator doer not light The relays operate w i t h the stand by 1w8tch i n the REC position
3. 8 Monitor Circuit The monitor circuit allows you to hear your own voice during transmission which is normally impossible with conventional transceivers This 1s very useful when During CW reception the audio frequency response is automatically narrowed to improve the clarity of sound 10 Build in Fixed Channel Circuits w i t h RIT crystals are optional The flxed channel circuits with RIT permit the use with the built in VFO for more enjoyable operation 11 Transverter Connector Transverter TV 502 2m can be connected for ready operation Changeover to HF or VHF is accomplished automatically with the power switch of the transverter 12 Built in AC Power Supply and D C Operation with Optional DC DC Converter DC DC Converter DS 1 optton can be attached to the transceiver for mob le operatlon 13 Wide Variety of Auxiliary Circuits and Devices The transceiver is completed with a noise blanker circuit VOX circuit side tone circuit marker circuit built in speaker 3 position AGC switch healer switch IF OUT terminal and linear terminal The following devices are available as optional extra Remote VFO VFO 820 CW Filter YG 88C Digitai Display IDG 1 Transverter TV 502 Microphone MC 50 Law Pass Filter LF 30A 14 Use of Digital Display Dial DG 1 option 1 Digital Display Dial The digital dial of TS 820 indicates transmit and receive frequencies using carrier VFO and local oscillator sig
4. f xed channel crystals are installed in the transcei ver H S W HEATER SWITCH This switch turns the heater circuits of the three transmitting tubes on and off The heaters would normally be turned to OFF to reduce power consumption in mobile or portable re ceiving POWER SWITCH The POWER switch turns all the power on and off in the TS 820 RIT KNOB T h s knob 1s used to change recelve frequency when the RIT clrcujt is in operatlon Set the center posltlon 0 of the RIT knob to the RIT OFF IF SHIFT KNOB By using this knob during reception the center frequency of the IF crystal filter can be shifted by i 1 7 kHz facilitating the adjustment of the tonal quality of receive signal or elimi natlng radio interference from nearby frequencies For nor mal operation this knob should be set to the center position click is heard M I C G A l N KNOB This knob is used for adlustment of the galn of MIC ampltfler dur ng SSB operatton Adlust so that the meter polnter does not deflect beyond the ALC zone CAR CARRIER LEVEL KNOB Used to adjust carrier level during CW operation Adjust so that the meter does not deflect beyond the ALC zone AF G A l N KNOB This knob adjusts the gain of the receiving audio amplifier The audio volume of the received signal increases as the control is turned clockwise RF G A l N KNOB This control adjusts the gain of the receiver section s RF am plifier
5. 1 7 0 Hz shift or 2125 2975 Hz WIDE 8 5 0 Hz shift To key in the FSK circuit of TS 820 insert a relay coil into the closed loop c rcuit of teletypewriter and connect the re lay contact to the RTTY KEY jack on the rear panel Fig 10 shows the relat onship between the transmit and receive fre quenc es of TS 820 The frequency shift of the FSK clrcuit is preset at the factory to NARROW but it can bechanged to WlDE by inserting the connector as shown in Fig 11 When operating at the WlDE posirion turn the IF SHIFT knob in the direction by about 1 2 kHz so that the mark and space signalsare well balanced during reception If a CW filter option is used for NARROW operation change the position of the connector of the IF unit refer to Operation with CW Filter Setting the MODE switch to FSK automatically decreases the input power of the final stage permitting a long time of continuous operation 4 20 SSTV SLOW SCAN TV OPERATION SSTV operation can be accomplished by simply connecting the output of SSTV camera to the PHONE PATCH IN jack or MIC connector1 and the input of SSTV monitor to the PHONE PATCH OUT jack or SPEAKER jack Wllen transmitting signals from the SSTV camera adjust its output so that the input power of the final stage is less than l0OW less than 125 mA lpl 4 21 OPERATION WITH A PHONE PATCH The rS 820 has rear panel lacks to fac l tate uslng the 1 s 8 2 0 w t h a phone patch The PHONE PATCH
6. The FAST AGC position is designed for use in CW operation SLOW Use the SLOW AGC position for SSB operation PHONES J A C K The headphones jack allows use of a 4 to 16 ohm set of headphones wlth a 1 4 phone plug attached When the phones are plugged Into the transceiver the speaker 1s dls connected M I C CONNECTOR The microphone connector is four pronged allowing use of the PTT microphone Figure 2 shows how to wire the p ug on the microphone cable M O D E SWITCH The MODE switch is used for selection of type of waves or for TUNE o eration TUN Used for adjustment of transmit conditions The input power to the final stage is low as compared with that for CW so that the final stage tube s can be protected against damage due lo overloading during adjustment Since the KEY circuit is ino perative in the TUN mode the transceaver cannot be used for transmission or reception CW Used for CW operation USB Used for USE operation It is internationally de termined Chat the 14 21 and 28 MHz bands be long to USE L S B Used for LSB operation It is internationally d e termined that the 3 5 and 7 MHz bands belong to LSB FSK For RTTY operation with teletypewriter COMP LEVEL KNOB Pull this knob during SSB operation The speech processor is activated and the talk power is increased Adjust the state o f compression by turning the knob while observing the COMP meter DELAY KNOB The DELA
7. Accessory CW filter is installed but ielec 1 Connection of IF board not moved to CW 1 1 See Sectran 6 2 1 I F board is amp t o f adiurtmrnl 2 R F gain control closed low senrit vity 1 Receiver rectlon reouirer realianmenr livily and intelligibility are poor An antenna ir connecred bur no signals are heard 1 See Section 2 Open R F G A I N control 1 See Section The R I T control ir a l zero w l t h the R I T circuit on but the receive and transmit SSB signal unintelligible CAUSE 1 Bad power cahlc or conner ionr 2 Blown newer r u p l y lure 3 Wrong polarily connrclion for D C operation 1 9 V D C supply not aJjurlrd 2 Short clrcuil in 9 volt powl r rut ply or tine 3 Improper battery volkagc in mobile or portable operation 1 Rear panel V F O plug not lnsrrlrd 1 Improper i n i c r o l h o n r connccllon 1 R E M E D Y 1 Chc ck col ll r md connr riionr 2 R p l a c the lure 3 Check for a ncgallvr ground 0owl r connucl on 1 See Secl on 6 3 2 Check the 9 v o l l iuiiilly 3 Chtcck ha t ry or altr rnator volI lyr I 1 lnlert the jumpered plug 1 Requare thc microphonr connl clor 2 Bad CW fllrer 1 Inoperative V F O or FC orcillalor 2 Microphone P T T r w i l c h lor rland by switch is in the transmit posilzon 3 Transverter switch is ON 1 The R I T conlrol s our o f adjurtnlenl 1 R I T circui
8. OUT fack has an impedance of 6 0 0 ohms and the PHONE PATCH IN fack requlres a hdgh Impedance Input See the lnstructlon sheet of the phone patch for cablang Instructdons 4 22 USE OF MONITOR SWITCH To monitor the quality of transmit signal during SSR operation set the MONITOR switch to ON to demodulate part of transmit IF signal This feature is useful when checking modulation conditions or adjusting the RF speach processor When monitoring use a headphone to avoid howling effect Note that if the H SW switch is OFF or the DRIVE knob 1s incorrectly adjusted the ALC circuit does not operate properly causing the level of transmit IF signal to become extremely high which results is distortion in the signal being monttored 1 Fia 10 RTTY Freauencv 1 4 23 NOVICE OPERATION The Kenwood TS 820 offers the unique opportunity to the beginning amateur of buying a top quality ham rig which adapts to novice operation at very llttle cost So the initial equipment investment is good for what ever level of license to which the operator advances For the novice to operate the Kenwood within the legal po wer limitat on all he has to do is remove one of the final tu bcs from the final RF section and replace it with a low cost module available from your dealer Alternately adjust the carrier level control TO keep the plate input power below 75 watts approximately 9 0 ma Adjusting the carrier level yields much less power output because it red
9. S 8 2 0 The SG switch may be left in the ON position Changeover between HF and VHF is automatically ac complished by the POWER switch of the transverter Be sure to turn off the transverter switch when the transverter is not connected TS 820 requires no modi fication for transverter operation 6 Connect the antenna to the ANT terminal on the rear of the transverter 144 MHz for TV 502 7 Check to see that the POWER switch and the standby switch of TS 820 are set to OFF and REC respectively Also check that the POWER switch of the transverter is set to OFF Then connect the power cords to AC outlet or DC power source for DC operation CONNECTION OF VFO 820 See Fig 291 Connect VFO 820 as shown in Fig 29 This connection ma kes your transceiver operation more enjoyable After con nection keep the 9 P MT plug removed from the EXT VFO connector of TS 820 in a proper place so that it is not lose Connecting cord is supplied with VFO 820 By manipulating the function switch of VFO 820 you can operate TS 820 as if you are using 2 sets of transmitters and receivers To calibrate the VFO frequency of TS 820 and that of VFO 820 proceed as follows 1 Set TS 820 in the receive mode and then set the FUNCTION switch to CAL RMT position 2 The FUNCTION switch of 0 8 2 0 may be set in any position 3 Tune the frequencies of TS 820 and VFO 820 so that a beat is generated When they are tuned for zero beat the freque
10. Turn the knob fully clockwise for maximum gain and for a correct S meter reading Turn the control counter clockwise to reduce the gain FIX CH FIXED CHANNEL SELECT SWITCH Th s four position rotary switch selects between four diffe rent fixed frequency channels which can be installed inside the transceiver Fixed frequency operation is convenient for operation on often used frequencies The fixed channel os cillator replaces the VFO when the FUNCTION switch is pla ced in the FIX position DRIVE KNOB The DRIVE tuning control tunes the plate tank circuit of the 12BY7A driver as well as receiver s antenna and mixer coils In receive the DRIVE control is tuned for maximum sensitivity lmaximum S meter deflection In transmit the DRIVE control 1s tuned for a maximum ALC reading When the control is correctly tuned for transmission it will be cor rectly tuned for reception PLATE KNOB The PLATE control adjusts tlie plate tuning of the two final ampl fier tubes Rear Panel View LOAD KNOB The LOAD control adjusts the loading of the pi circuit bet ween the final section and the antenna The control is adjust as described in Section 4 for impedance matching D H DISPLAY HOLD SWITCH WHEN THE DISPLAY DG l IS USED With this switch set to ON the frequency below 100 kHz on the display dial remains on even when the main dial knob is rotated This feature is useful to memorize the original f r e quency when chec
11. VFO can be obtained for each band The PD Board holds to function as a local oscillator lor the transm tter and the re crystal oscillators lor each band 2 mixer circuits waveform ce ver Stabilized osc llator output like that of the built in shap ng c rcuit and phase comparator I1 uses VFO as a Fig 16 PLL Unit standard oscillator to produce a voltage to control VCO vol COUNTER ASS Y U N I T OPTION IX60 1020 00 tage controlled oscillator It also forms a full electronic IF sh ft loop using an external carrier signal The VCO unit is composed of FET type osc llators for each band buffer am p l f e r circuit and the oscillator shut off circuit at the time of fault of the PLL circuit The oscillator frequency is controlled i by the control voltage from the PD Board The bands of both units can be selected by means of the diode sw tches Counter Ass y Unit This unit is composed of the counter mixer board that produces operating frequencies by mixing the VCO output local oscillator stgnal for the mixer with carrler signal and the counter board that counts the frequencies in d gits These units are housed in a r gid shielding case Since the frequencies are read by synthesizing all the local oscillator stgnals accurate operating frequencies are always counted under any operating conditions The counter output is pick ed up as a signal to dr ve the indicating tubes and is fed to the d splay unit DISPLAY UNIT
12. and is heard as a double beat signal Adjust the trimmer of the counter unit to obtain a zero beat By so doing the frequency indicated on the di gital display is accurately calibrated After the calibration disconnect the counter calibration cable Set the FUNCTION switch to CAL 25 kHz to receive a marker signal Make certain thattheANTterminalsareshorted ted with a 5 0 7551 resistor With the DRIVE knob set to its center position adjust the ANT and MIX coils for maxi mum deflection of the S meter using the frequency table gi ven below In adjustment start with the 1 8 MHz band and then proceed to other bands To adjust the 10m band use only 29 0 MHz in the 29 0 MHz band Adjustment 1 1 I I 1 Freouencv ANT Coil MIX Coil DRIVE coil 2 1 8 1 1 90 M H Z L8 1 L2 1 L15 1 3 5 7 14 ADJUSTMENT OF RECEIVE IF COIL RF A N D IF UNITS1 29 0 WWV Receive 25 kHz marker signal using any frequency Adjust the DRIVE knob and the main tuning khob for maximum def lection of the S meter Then adjust T2 of the RF unit and T4 T5 and T7 of the IF unit until the S meter indicates maxi mum deflection Do not touch T I T2 T3 and 16 3 75 MHz 7 15 MHz 14 175 MHz S METER ADJUSTMENT IF UNITI 2 1 I 21 225 M H z L13 29 00 MHz 15 00 MHz Disconnect the antenna and set the transceiver in receive mode The zero point adjustment of the S meter can now be acomplished in the following manner Adjust V R l so that the m
13. mod characteristic during reception 3 Built in IF SHIFT Circuit IF SHIFT circuit is built in the transceiver to shift IF pass band without changing receive frequency The circuit is also called the pass band tuning circuit I t allows you to eiiminate radio interference or sei the receive fre quency characteristic to the desired bandwidth simply by manipulating one control knob 4 Built in RF Processo The unique speech processor uses a quick time constant at 455 kHz Since this circuit is of RF type it produces little distortion and unlike the clipper system does not deteriorate the tonal quality 5 RF NFB RF NFB from the transmit final stage t o t h e driver stage improves the cross modulation distortion The use of the ampl fication type ALC further improves the quality of transmit signals 6 Newly Designed Analog Dial The combination of newly designed mono scale and su b dial provides easy reading of frequencies The adop 1 tion of a circuit that is completely free from changes in carrier frequencies permits accurate indication of fre quencies on one dial pointer 7 Rigid Structure and Easy Operation The transceiver is built with a die casting front panel and a rlgid chassis providing outstanding mechanical stability for mobile operation All the operating parts such as control knobs and dials are designed and arran ged according to human engineering technology to en sure maximum case of operation
14. on the rear pa nel to bring the output reading to about a 2 3 scale reading NOTE 1 The ALC meter is less deflected at the ON posi tion of the SG switch or at the CW position of the MODE sw tch than at the OFF position or the TUN position of these switches This indicates the normal state of RF NFB The MIC knob and the CAR knob should be properly adjusted un der normal transmit condftions NOTE 2 Transmission is not effected at the WWV or AUX positton of the BAND switch If the transceiver is left in the transmit mode over a few minutes the driver tube 12BY7A of the final stage may be damaged 4 12 SSB OPERATION Tune the TS 820 as described in Sections 4 1 to 4 1 1 Set the MODE switch to USE or LS8 and connect a microphone to the MIC connector NOTE lnternatlonal amateur practlce dictates uslng USB or LSB on the follow ng bands Key the transm tter and speak into the microphone with the tone of vojce used in normal operation Adjust the MIC con trol unt l voice peaks are just within the top limit of the ALC range printed on the meter scale The METER switch 1s in the ALC position If the transmitter section is driven beyond this range the transm tted signal will be distorted 21 0 MHz Band USE PTT OPERATION 28 0 MHz Band By connecting the microphone equipped with PTT switch the transceiver is readily used for PTT operation For com munication depress PTT switch with STANDBY switch left in the REC posi
15. transmit mixer of the RF unit The transmit mixer is a double balanced type mixer with 2 MOS FETs The local oscillator is VCO type voltage control led oscillator whose output is controlled by the PLL circuit to minimize spurious during transmission The SSB signal converted into the wanted transmit frequency is amplified by the transmit driver tube 112BY7A before being fed to the two S2001A power amplifier tubes of the final stage They operate in class AB 1 because of low distortion amplifi cation fo SSB signal The output signal is transm tted through a pi network to the antenna RF NFB is applied from the output of final stage to the driver stage to further reduce the cross modulation distortion RECEIVER SECTION The antenna signal passes through the RF A l l switch where it is attenuated by about 2 0 dB as necessary and is then amplified by the RF unit The amplified signal is fed to the buffer amplif er and mixed with VCO output in the balanced mixer with 2 MOS FETs to produce 8 830 kHz IF signal This signal 1s fed to the IF unit passes through the nolse blanker circudt and the crystal filter and is finally amplified by the 3 stage IF amplifier so that it is converted Into AF slgnal by the ring detector The AF signal 1s applted lo the AF AVR unit where it is am pl fied to the level to drive the speaker The frequency c h a iacteiistic of the AF amplifier is automatically changed to suit CW or SSB operation by means of the
16. 1 x 5 0 1 350 001 IJNIT AI A V I UNIT L IIELAY UNIT 9 0 0 0 1 iX4Y 1 0 8 0 0 0 1 l X 4 3 K 190 001 IO A product of KENWOOD CORPORATION 6 17 3 chome Aobadai Meguro ku Tokyo 153 Japan 6433 PRINTED IN JAPAN 850 1568 00
17. Hz within 6 db CARRIER SUPPRESSION Carrier better than 40 db down from the output signal SIDEBAND SUPPRESSION Unwanted sideband is better than 50 dbdown from the output signal IMAGE RATIO Image frequency better than 60 db 50 db for 10 meter band down from the output signal HARMONIC RADIATION Better than 40 db down from output signal SPURIOUS RADIATION Better than 60 db down from output signal without spurious radiation s IF REJECTION IF frequency is 80 db or more down from output signal RECEIVER SENSITIVITY 0 2 5 g V S f N N 10dbormore RECEIVER SELECTIVITY SSB 2 4 kHz bandwidth 1 13 db down 4 4 kHz bandwidth 1 60 db down CW 0 5 kHz bandwidth 6 dbdown 1 8 kHz bandwidth 60 db down with optional CW filter installed TUBE AND SEMICONDUCTOR 3 Tubes COMPLEMENT 5 IC s 30 FET s 74 Transistors 167 Diodes DIMENSIONS 13 2 wide x 5 9 high X 13 2 deep WEIGH 37 4 lbs Receive Trilnsmit 120 220 VAC 50 60 Hz operation 45 watts lheaterr an 26 waftslheaterr off 280 waxti lmaximum 13 8V DC operslion 5A lheatersanl 06A heaters off 15A lrnaxirnuml 20 220VAC 50 60 Hz 200watls PEP for SSB operation 160
18. MODE switch 5 2 BOARD AND UNIT I F BOARD X48 1150 00 The IF Board is very ilnportant for operation of transmitter and receiver It is composed of the microphone amplifier ring modulator crystal filter transmit receive IF amplifier i and the ring detector in addition t o the noise blanker circu t AGC ampl fier S meter amplif er speech processor and mo Fig 12 IF Board nitor circuit COIL PACK BOARD 1x44 1140 00 Crystal filters are self contained for SSB operatlon CW fil Tuning coils for the individual bands and stages band select ters YG 88Cl are available as optional accessories for easy rotary switch and variable capacitor are all arranged ratio installation nally in one unit These parts function together wlth the RF RF BOARD 1x44 1150 00 Board The RF Board holds the ALC ampl f er circuit and the block VFO BOARD 1x40 1110 00 bias circuit as well as the RF amplifier and mixer circuit for The PLL circuit is controlled by VFO signals thus the fre transmission and reception quency stabil ty of TS 820 is virtually determined by the sta It also includes a coil pack unit for the tuning circuit btlity of VFO The unit is composed of 2 FETs 2 transistors and 3 diodes Its oscillation frequency is set to 5 0 5 5 MHz Fig 1 3 RF Board COIL P amp CC mad l lO OO Fig 1 4 Coil Pack Board Fig 1 5 VFO Board PLL Unit 1x60 1010 00 This unit is composed of the PD Board and the VCO Board
19. N switch to CAL 25 kHz and the RIT switch to OFF Turning the RF ATT switch to ON redw ces the incoming signal and the marker signal can be recei ved more easily Detailed method of calibration is described below SSB Set the MODE swltch to USB or LSB Markersvgnals are re celved at every 25 kHz so accurate callbratlon 1s possible over the entlre range of the dlal Wlth the lranscelver set to your desired band turn the main tunlng knob so that a beat signal can be received at every 25 kHz Turning this knob further will cause the beat signal to vary from high to low tone and finally become a zero beat Accurate zero beat point is obtained by turning the IF SHIFT knoll in the direction ifor USBI and in the I direction for LSB Stop turning the knob at the zero beai point and rotate the dial calibrate knob alone while holdlng the main tuning knob until the dial pclnter indicates 0 25 50 or 7 5 on the dial The dial cal brate knob is forced against the main tunlng knob by means of a spring permit slip rotation with ease Set the IF SHIFT knob to its center position If CW filter i s not used obtain a zero beat point of marker slgnal and turn the main tuning knob counter clockwise until a beat signa of about 800 Hz is received While holding the main tuning knob turn the dial calibrate knob so that the dial pointer in dicates the colrect position on the dial When CW f lter is used turn the dlal when the marker signal cas
20. NTROLS Front View Panel 3 1 FRONT PANEL CONTROLS METER The meter monitors six different functions depending on the position of the METER switch In receive the meter is automatically an S meter The S meter shows received si gnal strength on a scale of 0 to 4 0 db over S9 In transmit the meter function depends on the position of the METER switch as described below METER SWITCH The position of the METER switch determines the function of the meter The switch selects one of the following func tions see Section 4 for nominal meter readings ALC Automatic Level Control In this position the meter monitors the ALC voltage of the internal ALC circuit or the ALC voltage feedback from a linear amplifier operated in conjunction with the TS 820 For SSB operation the ALC reading for voice peaks should be within the indicated ALC range of the meter The ALC voltage adjustment is made with the MIC control for SSB and with the CAR control for CW I P Plate Current In this position the meter moni tors the plate current of the final tubes The me ter scale is calibrated from 0 to 3 5 0 ma RF Output Power In this position the meter mo nitors the relative output power of the transcei ver There is no meter scale for this position Normally the reading should be adjusted with the RF VOLT control for a 2 3 scale meter reading T COMP This indicates the state of compression when the speech processor is op
21. OPERATING MANUAL CONTENTS TS 820 SPECIFICATIONS SECTION 1 FEATURES SECTION 2 INSTALLATION 2 1 Unpacking 2 2 Operation Location 2 3 Power Connections 2 4 Antenna 2 5 Microphone 2 6 Key Transmitter Tuning SSB Operation CW Operation Operation with a Linear Amplifier Fixed Frequency Operation Internal Cross Channel Operation Mobile Operation DX Operation Use of Processor RTTY Operation SSTV Slow Scan TV Operation 9 2 7 External Speaker and Headphone 4 21 Operation with a Phone Patch 3 2 8 RTTY FSK 4 22 Use of Monitor Switch 2 9 Ground 4 23 Novice Operation w SECTION 3 OPERATING CONTROLS 9 TS 820 BLOCK DIAGRAM 24 3 1 Front Panel Controls SECTION 5 CIRCUIT DESCRIPTION 25 3 2 Rear Panel Controls 5 1 Block Diagram SECTION 4 OPERATING INSTRUCTIONS 1 6 5 2 Board and Unit 4 1 Preliminary Procedure 5 3 Final Stage Power Amplifier 4 2 Receiver Tuning SECTION 6 MAINTENANCE AND ALIGNMENT 33 4 3 Reading the Operating Frequency 6 1 General Information 4 4 Calibrating the Frequencies 4 5 RF GAIN 4 6 RF ATT 4 7 RIT 4 8 IF Shift 4 9 Noise Blanker 4 10 AGC Automatic Gain Control 6 2 Accessories 6 3 Adjustment of Receiver Section 6 4 Adjustment of Transmitter Section SECTION 7 TROUBLE
22. OPTION X54 1170 00 CAR ASSY UNIT 60 1000 001 This unit uses a 6 digit fluorescent indicator to indicate ope Tl is is a crystal oscillator that functions as a carrier for the rating frequencies counted by the counter unit All the digits generator during transmission and as a BFO for ring detec glow greep to provide many hours of faiigueless operation lion dr rlng reception The output is partly applied to the PLL Unit and the COUNTER UNlT DISPLAY UUNlT IX54 1ii0 001 G c z L J Fig 1 8 Display Unit CAR ASSY UNIT 1 6 0 I D D O 0 0 1 Fig 19 CAR UNlT AF AVR BOARD 1x49 1080 00 FIX vox BOARD 1x50 i350 001 This Board represents the final stage of the receiver circuit Thls Board incorporates the fixed channel oscillator the VOX holdlng an AF amplifier and a 9V power stabilizer The fre voice control circuit controls voice operated transmission quency characteristic of the AF amplifier can be varied for the side tone oscillator to monitor CW signals and the vol CW and SSB operation tage generator circuit for the block bias circuit I 6Vl Fig 2 0 AF AVR Board F I X Y O X LX50 1350 00 L 1 Fig 2 1 FIX VOX Board VOX VR BOARD 1x54 1190 001 Three variable resistors VOX GAIN ANTI VOX and DELAY are directly mounted on a printed circult board 5V AVR BOARD OPTION1 1x43 1220 001 Thts is a 5V power stab l zer
23. SHOOTING 40 TOP and BOTTOM VIEW OF THE TS 820 42 SCHEMATIC DIAGRAM 43 TS 820 SPECIFICATION t lt S FREQUENCY RANGE 160 meter band 1 80 to 2 00 MHz 80 meter band 3 50 to 4 00 MHz 40 meter band 7 00 to 7 30 MHz 20 meter band 14 00 to 14 35 MHz 15 meter band 21 OO to 21 45 MHz 10 meter band 28 00 to 28 50 MHz A 10 meter band 28 50 to 29 00 MHz E 10 meter band 29 00 to 29 50 MHz Ci 10 meter band 29 50 to 29 70 MHz Dl d WWV 15 0 MHz eceive only MODE USE LSB or CW FSK POWER REQUIREMENTS PLATE POWER INPUT AUDIO INPUT IMPEDANCE 50 k ohms high impedance AUDIO OUTPUT IMPEDANCE 4 to 16 ohms speaker or headphones AUDIO OUTPUT More than 1 5 watts with less than 10 distortion into an 8 ohm load RF OUTPUT IMPEDANCE 50 75 ohms FREQUENCY STABILITY Within 100 Hz during any 30 minute period after warmup Within il kHz during the first hour after 1 minute of warmup AUDIO FREQUENCY RESPONSE 400 to2600
24. Y control adjusts the holding time of the VOX cir cuit for VOX or break in CW operation The control will have to be adjusted to the preference of the indtvidual operator ANTI VOX KNOB This control adjusts the level of the anti VOX slgnal fed in to the VOX circuit Adjust the control to prevent feedback of the speaker from tripping the VOX circuit VOX G A I N KNOB This control adjusts the sensitivity of the VOX circuit by ad justing the gain of the VOX amplifier for voice controlled operation R F ATT SWITCH With this switch set to ON ATT attenuator of about 2 0 dB is connected to the antenna circuit protecting the RF ampli fier and mixer circuit from strong input signals RIT SWITCH This is the switch for the RIT receiver incremental tuning1 ctrcuit To turn on the circuit press this switch to turn off press it once again The RIT indicator is illumanated when he RIT circuit is ON By turning the RIT knob the receive frequency of VFO can be changed by 1 3 kHz and the fre quency of fixed channel by 1 150 Hz without changing the transmit frequency B A N D SWITCH This 1 1 position switch selects all the necessary circuits to tune the transceiver to the desired 5 0 0 kHz band FUNCTION SWITCH This 7 position rotary switch selects one of the following Iransceive functions CAL This position allows callbration of the TS 820 s FIX internal VFO to one of the transceiver s fixed fr
25. ance with these operating instructions cessibility to the modules Most of the described adjust In fact the equipment owner can void the transceiver s war ments can be made without removing the boards from the ranty by attempting service or alignment without permission transceiver from the factory When operated properly the transceiver can give years of service without requiring realignment The information in th s sectton some general service procedures which can be accompl shed without sophisticated test equipment REMOVING THE CABINET See Fig 23 Figure 2 1 shows how to remove the TS 820 s cabinet Re move the eight top cover screws and the nine bottom cover screws and lift away the panels The speaker leads will still be attached to the chassis so be careful when removing the top cover The leads can be unplugged if necessary Fig 23 Removing the Cabinet Fig 24 Service Position 6 2 ACCESSORIES CAUTION BE SURE THE TRANSCEIVER IS UNPLUGGED AND TURNED OFF BEFORE REMOVING THE CASE INSTALLING THE C W FILTER IYG 88C See F gure 251 Install the filter unit according to the following procedures 1 Remove the top cover of the transceiver using a screw driver Care should be used not to break the leads con nected between the 2P connector and the speaker on the cover Next remove the 2P connector 2 Turn the transceiver upside down and remove the bot tom cover 3 Insert the filter in place at
26. calt The crystal frequency is determined by the following formu 4 17 MOBILE OPERATION las The compact size and solid state design of the TS 820 make it deal for mobile use by using optional DS 1 Cgystal Frequency MHz 5 5 MHz X Operating Fre Be sure to use a mobile antenna which meets the require quency MHz ments described in Section 2 X 1 8 for the 160 meter band X 3 5 for the 8 0 meter band X 7 0 for the 4 0 meter band X 14 0 for the 2 0 meter band X 21 0 for the 15 meter band X 28 0 for the 10 meter band or X 28 5 for the 1 0 meter band or X 29 0 for the 10 meter band or X 29 5 for the 10 meter band Crystal Specifications HC 25 U holder 5 0 to 5 5 MHz os cillation frequency and see Figure 9 for type of oscillation circuit Example Desired Operating Frequency 7 255 MHz Crystal Frequency 5 5 MHz 7 0 MHz 7 255 MHz 5 245 MHz This same crystal will operate on each band Operating Frequency 5 5 MHz X in MHz Crystal Frequency in MHz Example Crystal Frequency 5 245 MHz On the 14 MHz band the crystal will oscillate at Operating Frequency 5 5 MHz 14 0 5 245 MHz 14 255 MHz 4 16 INTERNAL CROSS CHANNEL OPERATION The TS 820 contalns a unlque design feature which allows cross channel operation without a separate external VFO The TS 820 s internal VFO is used together with the fixed frequency osc llaltor to allow reception and transmission on dif
27. cted Flip the stand by switch to SEND and check that the plate current IP is 6 0 ma I f the plate current is not correct adjust the rear panel BIAS control for a correct 6 0 ma of idling current and return the stand by switch to REC CAUTION If the plate current is very much higher than 6 0 ma do not leave the stand by switch on for more than a few seconds Excessive plate current shortens the life of the fi nal tubes DRIVE TUNING See Fig 8 Shift the METER switch to ALC and the MODE switch to TUN and peak the ALC reading maximum meter deflection with the DRIVE control The stand by switch is in the SEND posltion for adjustment NOTE If there is no ALC reading indicated increase the CAR control until there is an ALC reading PLATE TUNING See Fig 8 Turn the METER switch back to IP leave the MODE switch at TUN and flip the stand by switch to SEND Quickly adjust the PLATE control to dip the plate current a minimum meter readlng Return the stand by switch to REC NOTE The TUNE position permits tuning of the final tank clrcuit at reduced power without danger to the tubes With the MODE switch in the TUN position the screen voltage of the finals is reduced to approximately 50 and the keying circuit is shorted TABLE 3 Summery of Transmitter Tuning Procedures Table 2 Initial Switch Settings for Transmission The controls not described should be set as described in Table 1 MODE S w t c h Procedure Ad
28. d for FSK operation A 2 P plug should be inserted i for connection to the switching circuit of a teletypewriter G 7 8 DC DC CONVERTER CONNECTING HOLE ALC feedback Occupred 8s lermlrlal External speaker DC DC Converter DS 1 opt on can be wlred through thls hole For wlrlng remove the cover plate Rcmove screw and Sw1r h sIo rwr Lock lcvcr by allach ng slopper plate to opposile s d r sloppcr pale lo oppqs te side screw 220v 220v SIUP CI plale Fig 5 Changing Power Voltage from 220V to 120V SECTION 4 OPERATING INSTRUCTIONS 4 1 PRELIMINARY PROCEDURE Set the MIC and CAR controls to zero and the MODE switch to LSB USE or CW to prevent acc dental transmlt con d tions before tunlng The TS 820 must be operated Into a 5 0 75 ohm antenna or dummy load w t h an SWR less than 2 1 Random length wlre antennas or light bulb d u m my loads cannot be used Conventional half wave d poies and bea n antennas should only be used at or near t l w r resonant frequency Exceeding an SWR of 2 1 can damage the components in the output stage of the transceiver Be sure to complete all of the requlred cabl ng as described in Section 2 3 2 8 Wtth a su table antenna and m crophone or key1 connected to the transcelver set the TS 820 sw tches to posltlonsdes crlbed in Table 1 4 2 RECEIVER TUNING Refer to Table 1 for the n t a i sw tch settlngs of the TS 8 2 0 for recelv
29. dance match fairly close in order to limit power loss This is parti cularly true at the higher frequencies The longer the h e and the higher the frequency the more important SWR be comes However in mobile installations the transmission line seldom exceeds 2 0 feet in length and an SWR of even 4 to 1 adds very little power loss The only rime SWR will indicate a low figure is when the antenna presents a load close the 5 0 ohms but many mobile antennas will have a base nmpedance as low as 15 or 2 0 ohms at their resonant frequency In such a case SWR will indlcate 3 or 4 to 1 and yet the system will be radiating efficiently The really important factor in your mobile antenna is that is should be carefully tuned to resonance at the desired fre quency The fallacy in using an SWR bridge lies in the fact that it is sometimes possible to reduce the SWR reading by detuning the antenna Field strength may actually be redu ced in an effort to bring SWR down Since field strength is the primary goal we recommend a field strength meter for antenna tuning For antenna adjustments the transceiver may be loaded lightly using the TUN position instead of operating at full power output This will limit tube dissipation during adjust ments and will also help to reduce interference on the fre quency In any case do not leave the transmitter on for very long at one time Turn it on just long enough to tune and load and get a field st
30. e quency channels if an optional fixed channel cry stal is installed With the switch in this position a signal is generated at the selected fixed channel frequency and the main tuning knob can be tuned to zero beat the calibrating signal CAL This position allows calibration of the VFO 820 RMT remote VFO to the transceiver s operating fre quency With the switch in this position the transceiver generates a calibrat ng signal and the VFO 820 can be tuned to zero beat the calibra ting signal CAL With the switch in this position the transceiver s 25 kHz calibrator circuit generates a marker signal at every 25 kHz for normal calibration of the internal VFO VFO The switch is kept in this position for normal transceive operation VFOR With the switch in this position the TS 820 s in ternal VFO controls the receive function and the internal fixed channel oscillator controls the trans mit function if fixed channel crystals are installed in the oscillator FIXR With the switch in this position the TS 820 s in ternal VFO controls the transmit function and the built in fixed channel oscillator controls the re ceive function if fixed channel crystals are instal led in the oscillator The VFOR and FIXR allow cross channel operation without an external VFO FIX Wlth the swltch in this pos tion the TS 820 s f xed channel oscillator controls the transmit and recelve function of the transceiver if accessory
31. e RIT knob for your desired p tch of the sound Also adjust the IF SHlFT knob for maximum signal strength OPERATION W l T H DIGITAL DISPLAY OPTION The digital display indicates the frequency of carrier signal BFO signal so that the frequency indicated is deviated from the transmit frequency of the opposlte station by the receive beat frequency during CW reception with IF SHlFT knob set to its center position the frequency indicated becomes lo wer To zero in the frequencies with the optional digital display DG 1 set the RIT switch to ON and turn the RIT knob while manipulating the standby switch in order to locate a point at which the frequency indicated is not changed regardless of the position of the stand by switch With the RIT knob left in that position turn the main tuning knob until the slgnal from the opposite station becomes a zero beat signal zero beat signal can be easily noted by turning IF SHlFT knob This completes the zeroing of the transmit frequency Turn the RIT knob for your desired pitch of sound 4 14 OPERATION WlTH A LINEAR AMPLIFIER Tune and load the TS 820 as described in Sections 4 1 through 4 1 1 and adjust it for the selected mode The REMOTE connector on the back panel is provided for in terconnections with an ampliher See the instruction ma nual of the amplifter to determnne whether the linear requires a normally open during recelvel or a normally closed during receive relay contact Connec
32. e is output but the RF meter shows no output RF meter deflects too far 1 Bad driver tube 1 Carriei requires balancing Plate current is too low Tuning becomer very broad Idling current increaser Every rime either of the final tuber is replaced the TS 820 requirer neutraltrb tion 1 VOX GAIN control i s closed 1 See Semion 4 12 2 VOX switch is OFF 2 Turn the switch on 1 Replace the tube 1 See Section 6 4 requires alignment 1 See Section 6 4 on all bandr Broad DRIVE tuning on one or more bandr 1 i CAUSE 1 NO high voltage 800v on the final tuber 2 Bad final tuber 3 SG rwirch is turned off 1 Too little MIC gain 1 Open microohone plug or bad micro phone 2 Too little microphone gain 3 Defective microphone am lifier on the GENERATOR board 1 RF VOLT control not adjusted cor rectly 1 RF VOLT control not adjusted cor rectly 1 Bad final rubes REMEDY 1 Cheek the HV power supply 2 Replace the tuber 3 Slide the switch up 1 Increase the MIC GAIN control 1 Check the microphone 2 Increase the MIC GAIN conlrol 3 Repair the circuit 1 Adiurt control for 213 scale readong ar full output 1 Adjust control for 213 scale reading at full output 1 Replace the tuber 1 See Section 6 4 VOX trips with AF round from the speak er 1 ANTI VOX control requires adjust ment VOX circuit releaser between words
33. el for maximum sensitivity The pointer of the RF meter will deflect if the carrier is unbalanced In this case be sure to turn the MIC knob to the minimum position To balance the carrier adjust the trimmer TC1 and the semi fixed resistor VR2 alternately until the meter pointer in dicates a minimum position Change the mode to USB and if the pointer deflects then readjust so that the pointer deflects the same amount for both LSB and USE NEUTRALIZING THE FINAL STAGE Adjust the drive and final stages completely using 21 3 MHz with a dummy load connected Set the SG switch to OFF and measure the output at the ANT terminals shorted with dummy load with a high sensi tivity RF voltmeter or a tester having a rectifying diode such as 1 N60 Then turn the nuetralizing variable capacitor lTC1 viewed through the adjusting hole in the upper panel of the final box for minimum output Normally it is unnecessary to remove the shielding case for this adjustment but be sure to use a insulated screwdriver Use of a non insulated screwdriver will result in incorrect adjustment and also cause electric shocks ADJUSTMENT OF SIDE TONE LEVEL AF AVR UNIT Adjust VR3 to your desired level ADJUSTMENT OF MONITOR LEVEL IF UNIT Adjust VR4 to your desired level Fig 3 1 Counter Frquency Calibration lt lt lt
34. ell as in terference connect a good earth ground to this lug FUSE This fuse is a 3AG 4 amp fuse which protects the power supply of the transmitter against short circuits Never use a higher amperage fuse than the one specified An improper one can cause extensive damage to the transmitter When the fuse blows out try to determine the cause before repla cing it Wnen the position of the AC Voltage Selector Sw tch is changed it is also necessary to change the power fuse For 120 volt operation a 6 ampere fuse for 220 volt operation a 4 ampere fuse prov ded with the TS 820 should be used A C VOLTAGE SELECT SWITCH This sldde switch switches the primary of the power transfor mer to select 120 or 220 VAC operation POWER SUPPLY CONNECTOR This 12 pin connector is used to connect an AC or DC power source to the transceiver TRANSVERTER CONNECTOR This 12 pin connector is used to control an accessory VHF transverter FUNCTION FUNCTION Tranrverter in Normally closed relay contact Ground 1 0 210 VDC 11 No connection 12 Ground i 3 4 5 6 X VERTER SWITCH When VHF Transverter JTV 502 is connected to the trans ceiver the selection of HF or VHF is automatically accom plished by setting the transverter switch to ON or OFF t 2 1 0 VDC No connectton 1 0 0 VDC Tranrverter in PHONE PATCH I N J A C K This is a phone patch input terminal for transmission of SSTV o
35. erated HV High Voltage In this position the meter moni tors the high voltage from the power supply The meter scale is calibrated from 0 to 10 indicating 0 to 1000 volts VFO INDICATOR The VFO indicator is a light emitting diode which illuminates whenever the TS 820 s internal VFO is controlling the trans ceiver s operation The indicator is not lighted during fixed channel or remote VFO operation This light emitting diode is illuminated when the RIT circuit is turned on showing that the transmit and receive frequen cies may be different SUB DIAL The sub dial is turned with the main tuning knob to select the operating frequency of the transceiver It is calibrated at 50 kHz intervals from 0 5 0 0 kHz D l A L SCALE The unique mono scale permits direct reading of frequencies over the range of 0 to 5 0 0 kHz graduated at 1 kHz inter vals Operating frequency can be obtained by adding the frequency read on the dial to the frequency MHz indicated on the BAND switch D l A L CALIBRATE KNOB This knob is used to calibrate the reading on the dial scale It should not be used for tuning purposes M A I N T U N l G KNOB Thls knob turns the VFO and dial scale to select the fre quency to be added to the band frequency to establish the transceiver s operating frequency STAND BY SWITCH This two position lever switch selects one of the following functions REC The transceiver is receiv
36. eter pointer indicates its minimum position If a standard signal generator SSG is available adjust VR2 until the S meter indicates 9 using 14 175 MHz 4 0 dB signal reading on SSG L6 L19 LlO L1 1 L12 L14 L9 L 1 ADJUSTMENT OF A N T A N D M I X COILS COIL PACK UNIT L16 1 L17 L5 L18 The ANT coil and MIX coil are included in the coil oack unit 6 4 ADJUSTMENT OF TRANSMITTER SECTION ADJUSTMENTOFTRANSMIT DRIVE COIL COIL PACK UNIT The drive coil is built in the coil pack unit Set the SG switch on the rear panel to OFF and the DRIVE knob to its center position Then set the METER switch to ALC and the MODE switch to CW or TUN position With the standby switch in the SEND position adjust the drive coils for maximum ALC deflection for each band using the same frequency as for the adjustment of ANT and MIX coils During the adjustment turn the CAR knob just enough to swing the meter ALC This adjustment can be started with any band ADJUSTMENT OF TRANSMIT IF COIL IF A N D RF UNITS Using any frequency set the transceiver in transmit mode at CW or TUN position Adjust T5 of the IF unit and T1 of the RF unit until the meter IALC indicates maximum deflection CARRIER BALANCE ADJUSTMENT IF UNIT1 See Fig 31 With a dummy load connected to the ANT terminals adjust for the maximum output using 14 175 MHz frequency Set the transceiver in LSB mode and turn the RF VOLT knob on the rear pan
37. ferent frequencles he fixed channel oscillator must have one or more accessory crystals installed for this feature to work FUNCTION TRANSMIT 1 Fixed channel 1 V F O R I 01cl1aIor Fixed channel Fixed channel I The normal operating procedures described previously ap ply ro mobjle operation The noise blaker should be used to reduce ignition and impulse noises for clear reception Re member that during transmission the transceiver draws about 15 amps so be careful not to drain the car s battery 4 1 8 DX OPERATION Use of PROCESSOR In DX long distance operation it may be desirable to in crease the talk power by using the speech processor The speech processor used in TS 820 converts voice signals into 455 kHz SSB signals for compression at quick time cons tant It produces little distortion and unlike the clipper system does not deteriorate the tonal quality The compression level can be adjusted with the COMP LEVEL knob Set the meter knob to COMP and adjust so that the meter indicates anywhere within the scale 20 4 0 dB The speech processor is used only for DX opera tion In other operations such as local QSO press in the COMP LEVEL knob so that signals can be heard more natu rally 4 19 RTTY OPERATION For RTTY operation the use of demodulator and teletypewriter is essential The demodulator should be de signed to operate from audio inputs and equipped with a fil ter for 2125 2295 Hz NARROW
38. impedance When the headphones are connected to the front panel PHONES jack the speaker is disabled 2 8 RTTY FS K For RTTY operation connect a teletypewriter to the RTTY KEY jack on the rear of the transceiver Since this jack is connected to the switching circuit for shifting frequencies a relay should be inserted in the closed loop of the teletypew riter for keying operation 2 9 GROUND So preventing to receive an electric shock TVI and BCI select a good effective bround for installation and then con nect an earthing wire to the backside of GND terminal use a heavy earth line as big as possible it is because short line wiring is regarded as most effective for operation VFO 820 ANT S E o LOOP MICROPHONE HEADPHONE EXTERNAL SPEAKER Fig l b l Power Plug Wiring Fig 1 a Connection 1 Fig 2 Microphone Connection Wiring 7 IMPORTANT When wlrlng a new power plug conllrm lhat the p n numberng an he new plug s 8dentcal to rhe p n numberng on he POWER conneotor The ransoelver oan be damaged by moorreot p n wiring 1201220 VAC 3 Dz 0 1 1201220 VAC 05 04 0 01 I AC OPERATION seen frorn the cord I a Unsunlable for P T T aperailan I Mcroplions switch b Unsuitable for P T T operation Swllch c Suitable lor P T T operation k Fig 3 A Suitable PTT Microphone Fig 4 Back Panel Jurnpered EXT VFO Connection SECTION 3 OPERATING CO
39. ing unless the micro phone PTT switch is switched to transmit or the VOX circuit is activated ATT INDICATOR SEND The TS 820 is locked into the transmit mode in this swttch position Thls indicator uses a light emitting diode It is illuminated when the RF ATT switch is turned to ON FIX FIXED CHANNEL OPERATION INDICATOR The FIX ind cator is a lightemitting diode which illuminates whenever the TS 820 s internal fixed frequency oscillator is controlling the transceiver s operation VOX SWITCH This two position lever switch seiects one of the following functions MAN With the switch in this position the transceiver is switched into transmit or receive by the stand by switch or the PTT switch on the microphone VOX With the switch in this position the VOX circuit is turned on for voice operated transmit on SSB se mi automatic break in operation on CW N B SWITCH The NB switch turns the built in noise blankercircuit on and off The noise blanker is designed to reduce pulsating igni tion type nolses When the lever switch is flipped up the c rcuit is turned on M O N l MONITOR SWITCH This switch is used to demodulate part of the output of the transmit IF amplifier for monitoring transmit signals AGC SWITCH The AGC switch controls the AGC Automatic Gain Control c rcuit giving the operator three choices OFF It may be desirable to turn the AGC off when re celv ng a very weak s gnal FAST
40. king other frequencies The DH switch being ON turns off the liglits for MHz frequencies elimina ting a worry about mis reading frequencies 3 2 REAR PAN EL CONTROLS a R F V O L l Use the RF VOLT control to adjust the sensitivity of the RF output function of the meter Adjust it for a 2 3 scale rea ding during CW transmission COOLING F A N This fan cools the RF amplifier section of the T S 8 2 0 to In sure reliable and efficient operation ANTENNA CONNECTOR This 5 0 2 3 9 coax connector should be attached to a suita ble antenna for transmitt ng and receiving See Section 2 4 for a discussion of an appropriate antenna B l A S CONTROL The BlAS control adjusts the bias voltage of the two S2001A 16146B amplifier tubes Tuning the control clock wise increases the idling plate current of the tubes Section 4 describes adjustment of the bias current a SG SWITCH The SG slide switch controls the screen grid voltage on the final tubes For tuning or neutralizing the TS 820 you can set the switch to the OFF position Turn the switch back to the ON position for normal operation The SG voltage 1s on when the switch is up and off when the switch is down 8 TRANSVERTER I N J A C K This is the RF input jack for input from a VHF transverter a TRANSVERTER OUT J A C K This is the low level RF output jack for use with a VHF trans verter G N D IGROUNDI LUG Toprevent accidental shocks from the chassis as w
41. l ng fan to avoid temperature rlse during operatton Th s unit holds the stand by relay a 5V power stabilizer to feed power to the PLL circuit and smoothing capacitors to obtain low voltage DC power The relay of thls unit 1s used to select OC signal for con trolling block b as cross channel operation etc lt lllll llllll lllll8 08 mmm anmsm a aa8 a a lt m w lt t mt s s m lt mm mt om 88tm SECTION 6 MAINTENANCE AND ALIGNMENT illlll ulll lla 8 m m a aa as gt 8 lt aaa 8 lt a lt lt 6 d a 6 lt lt lt 8 c mos tm m amt 88 m m 8 8am mmsm 6 1 GENERAL INFORMATION SERVICE POSITION See Fzg 24 The TS 820 has been factory sligned and tested to The TS 820 should be placed on its side with the final sec specifications before delivery to the customer Under nor tion up for any alignment or service This position permits ma1 c rcumstances the transceiver will be properly adjusted adequate ventilation for the final tubes as well as easy ac to operate in accord
42. la cent to the power transformer Solder the lead onto the terrnlnal board Rear panel of Ts 820 Roar panel r Fig 25 Installing the C W Filter Fig 26 lnstallrng the DC DC Cbnverter MOUNTING THE DIGITAL DISPLAY DG 1 See F I 27 D G 1 is provided w t h the following 3 units Display Unit 5V AVR Unit Counter Ass y Unil 1 Mount the above 3 units in place in the set using screws Fig 27 a 2 Insert the connector and the wiring is completed 3 Calibrate the standard frequency of the counter ass y unit by WWV refer to paragraph 6 3 For detailed method of mounting refer to the instruc tlon manual of D G 1 Fig 2 7 la COUNTER ASS Y UNIT Fig 2 7 i b l Fig 27 cl T Fig 27 dl TRANSVERTER TV 5021 To connect the transverter to TS 820 proceed as follows 1 Check that the power to the transverter and TS 820 is OFF 2 Connect the cable supplied with the transverter to the X VERTER connector of TS 820 and the CONTROL con nector of the transverter 2m CONTROL connector for TV 502 3 Connect the supplied pin cords to the X VERTER OUT jack of TS 820 and the TX IN jack of the transverter 2m TX IN jack for TV 502 4 Connect the supplied earth cable between the GND ter mlnais of TS 820 and the Transverter This connection is necesarry because it prevents electrical shocks and provides stabilized operation 5 Turn on the transverter switch on the rear panel of T
43. lng and then contlnue wlth the described proce dure TABLE 1 Initial Switch Settinqs for Receivinq REAR PANEL CONTROLS Push the POWER switch on The meter d a l scale and VFO ind cator w l l light ndicating that the transceiver is opera tlng The receiver section is fully solid state allowing recep tlon with the H SW switch turned to OFF Advance the AF GAlN control clockwise until some recelver noise is heard in the speaker Turn the main tuning d a l w tliin the frequency range of the amateur band chosen u n t l a signal is heard Tune the signal for the clearest possible reception and then adjust the DRIVE control for maximum deflection of the S meter The RF GAlN control varles the AGC feedback voltage whlch effects the S meter reading With the RF GAlN control fully clockwise the S meter glves a proper signal strength rea ding Tuning the control counter clockwise reduces the RF GAIN reducing signal strength and band noise 4 3 READING THE OPERATING FREQUENCY The frequency dial of TS 820 indicates accurate carrier positions regardless of operating modes because of the use of a special circuit system thus the transmit and receive fre quency can be directly read on the dial except for CW recep t o n in which case the frequency on the dial is lower by the beat frequency than the receive frequency When the d g t a l display D G l ioptlon is used If there is any difference between the frequencies o
44. lust BIAS control for 60 ma TUN ALC SEND Peak the ALC readlog wlrh the DRIVE control TUN 1 IP 1 SNED D8p plate current 8 t h PLATE conrrol FRONT PANEL CONTROLS REAR PANEL CONTROLS a d y h BAND Switch Desired band H SW Switch MODE Switch USB or LSB depending on selected band VOX Switch MONl Switch MIC Control Fully counter clockwise CAR Control Centered METER Switch PLATE Control Mlddle of the range for the band DRIVE Control Centered FUNCTION Swltch VFO RIT Switch SG Switch UP ON EXT VFO Connector Jurnpered OFF plug nserted METE RF 5 8 80 2 COUP 0 LLC a e CW I Fig 7 Adjustment of the Plate Idling Current 1 DRIVE adjosl nenl arigular dspacemailt b ALC RF Fig 8 Plate and Drive Tuning 19 SEND Peak RF output by alternalely adjusting the PLATE AND LOAD controls PLATE A N D LOAD TUNING CAUTION When the MODE switch is in the CW positlon tile final tubes draw full plate current in transm t Final tube life is directly related to the length of tune up periods Do not transmit with the tubes out of resonance for more than 1 0 seconds at a tlme Turn the MODE switch to CW turn the METER switch to RF and set the stand by switch to the SEND position Quickly adjust the PLATE control and then the LOAD control alter nately to peak maximum meter deflection the power out put If necessary adjust the RF VOLTcontrol
45. n the dial CONTROL BAND Switch POWER Switch H SW Switch Stand by Switch NB Switch RIT Switch RF ATT FUNCTION Switch AGC Switch MODE Switch PLATE Knob DRIVE Knob RIT Knob AF GAlN Knob IFSHIFT Knob RF GAlN Knob EXT VFO Connector SG Swltch X VERTER Switch POSITION Desired band OFF OFF REC OFF OFF OFF VFO SLOW or FAST To the appropriate sideband or CW Middle of the range for the band Centered Centered Fully counter clockwise Centered Fully clockwise The jumpered plug must be in this socket ON up position1 OFF The remaining controls do not affect reception so they may be in any position scale and the digital dial option the correct frequency is on the digital dial In this case the analog dial should be c a l i brated with the calibrate knob NOTE When the digital display is used the dig ts for 10 MHz order change according to the BAND switch and are independent of the counter unit In the 29 5 MHz band for example the indication 29999 9 is followed by 20000 0 Dial Reading 177 kHz The operating frequency of the transceiver is the sum of the band 1rrqurncy and dial reading frequency 1 Crample Band switch 14 MHz Ollerartng Frequency 14000 177 14177 kHz Fig 6 Reading the Operating Frequency 4 4 CALIBRATING THE FREQUENCIES To read frequenc es correctly from the dial scale the dial must be calibrated previously using a 25 kHz marker To ca librate set the FUNCTIO
46. nals instead of converting VFO frequencies Thus accurate frequencies can be read at all times at any band and any operating made Since the accuracy of frequencies is set up anly by the 1 MHz standard oscillator frequencies can be read ac curately up t o 1 0 0 Hz order by calibrating the 0S illat0r with WWV The green indication on the dial assures many hours Of fatigueless operation 2 D H display hold Switch By pressing the D H switch the frequency read on the digital remains on thus serving as a memory system SECTION 2 INSTALLATION 2 1 UNPACKING ve and between 15 and 200 ohms wfll take o w e r from the Remove the TS 820 from its shipping box and packing material and examine it for visible damage If the equipment has been damaged in shipment save the boxes and packing material and notify the transportation company immedia tely It is a good idea to save the boxes and packing material in any case because they are very useful for shipping or mo ving the equipment transceiver with little difficulty If openwire or balanced type transmission line is used with the antenna a suitable an tenna tuner is recommended between the transceiver and the feed llne Methods of construction and operating such tuners are descr bed in detail in the ARRL Antenna Hand book and similar publications For operation on 75 and 4 0 meter bands a simple dipole antenna cut to resorlance in the most used portion of the bands will perform
47. ncies of both units are perfectly calibrated For operation of VFO 820 refer to the instruction ma nual of VFO 820 1 Transceiver Interconnecting Cord Fig 29 Connection of Accessory Remote VFO REMOTE CONNECTIONS EXTENSION FEET Fig 3 0 shows the REMOTE connector This 8 pin plug The TS 820 is provided with two extra feet which can be can be used for attaching linear amplifiers or other external used to raise the front panel of the transceiver In some accessories to the transceiver operating positions the tilt makes it easier to read the dial and meter Fig 3 1 shows how to install the feet r 1 R L I I i i amp Fig 31 Attaching the Extension Feet TO an external speaker FIXED CHANNEL CRYSTAL INSTALLATION Fig 3 0 Remote Connector Section 4 15 describes fixed channel operation with the TS 820 To install the accessory crystals remove the trans ceivers bottom cover and locate the FIX VOX board side the power transformer Insert the crystal in the desired channel position the posi tions are labeled on bottom of the case and use the appro priate trimmer TCl through TC4 to net the crystal The CAL FIX feature of the TS 820 can be used to net the cry stals as described in Section 4 4 6 3 ADJUSTMENT OF RECEIVER SECTION ADJUSTMENT OF 9V AVR VOLTAGE AF AVR UNITI Adjust VR4 for 9V between the terminal 9 and chassis ADJUSTMENT OF AGC BIAS AF AVR UNIT Adlust VR1 for 3 3V be
48. or holds too long Excessive plate current Plate current is too high or too low for 1 See Section 4 12 1 VOX time hold control requires adiurt ment 1 Detuned final recrion 2 Low negative power supply voltage 3 Idling current requires adjustment 1 Carrier requires adjustment 1 See Section 4 12 1 See Section 6 4 2 Check the power rupoly ourput 3 See Section 4 1 I 1 Adiurt CAR conrrol 1 b lt lt 6 t E9 rs t t r t c I a a gt cm m38 a gt m88 m3m TOP amp BOTTOM VIEW OF THE TS 820 2 u lt 8 8 gt 8 a lt lt m gt lt mm 8 FAN I1F lJNll i 11 A C K UNIT iX44 1 150 001 iX44 1 140 001 PLL ASS Y UNlT iXGO 1010 001 CARHICR ASSY UNlT l X 6 0 1 0 0 0 0 0 1 1 FINAL UNlT iX5G 1 2 0 0 0 0 1 MAHI lt ER UNlT 1x520005 001 1 POWER lnhNSFDRMER FlXVOX UNlT
49. ot required It is more important to have a microphone with a smooth flat re sponse throughout the speech range The microphone manufacture s instructions should be follo wed in connecting the microphone cable to the plug With many microphones the push to talk button must be pressed to make the microphone operative For PTT operation this feature may be disabled if desired by opening the micro phone case and permanently connecting the contacts which control the microphone The standard microphone sensitivity is within the range of 5 0 dB to 6 0 dB If a microphone having a higher sensi tivity is used the ALC circuit will not function properly In this case insert an attenuator as shown in the illustration at right or connect a resistor 10k 33k ohms in parallel w i t h the capacitor 1 0 0 pF C 9 4 in the IF unit X48 1150 00 of the transceiver MIC TS 820 MIC Connector 2 6 KEY If CW operation isdesired connect a key to the KEY jack 2 7 EXTERNAL SPEAKER AND HEADPHONES Receive audio output from the TS 820 is 1 5 wattat 4 to 16 ohms The TS 820 has a built in speaker However if an external speaker is desired for fixed station or mobile opera tion Simply connect it to the SPEAKER jack on the real pa nel The speaker may be any good 8 ohm permanent ma gnet type in the 4 inch or large sire The internal speaker is disconnected when an external speaker is used Headphones should also be 8 ohms
50. r other line inputs PHONE PATCH OUT J A C K This is a line output terminal for phone patch or recording I t is also used for connection to the input of FSK demodulator SSTV SPEAKER J A C K The receiver audio output can be connected through this jack to the external 4 to 1 6 ohm speaker The internal speaker is disconnected when an external speaker is con nected EXTERNAL VFO CONNECTOR This 9 pin connector provides a means of interconnecting the KENWOOD VFO 820 another external VFO or an ex ternal receiver The interconnecting cable is provided with the VFO 820 The 9 pin jurnpered VPO plug provided with the TS 820 must be inserted in this socket for normal trans ceiver operation PIN FUNCTION VFO rlgnal VFO signal shield Ground 12 6 VAC Relay voltage on iransm tl PIN FUNCTION I 9 VOC to irlternal VFO pin 91 1 9 VDC to external VFO REMOTE CONNECTOR The REMOTE connector is an 8 pin socket for use in inter connecting a linear amplifier an external speaker or another accessory item See Fig 301 IF OUT J A C K FUNCTION PIN 2 4 Receive s gnals from the f nal IF stage are supplied to thls jack for monltorlng waveforms of opposlte stattons C W KEY J A C K I Connect a key to this 1 4 phone jack for CW operation 1 FUNCTION No connec ion Normally closed relay contact Ground RTTY KEY J A C K i N rrnally open Ground PIN This is use
51. rength reading Start out with the an tenna whip at about the center of its adjustment range Set the VFO to the desired operating frequency and then adjust c the PLATE control for a dip and then the LOAD control Then observe the field strength reading The field strength meter may be set on top of the dash on the hood or at an elevated location some distance from the car Change the whip length a half inch or so at a time retune the finals each time and again check the field strength at the antenna Continue this procedure until the point of maxi mum field strength is found This adjustment will be most critical on 7 5 meters somewhat less critical on 40 until on 10 meters the adjustment will be quite broad After tuning the antenna to resonance the finals can be loaded to full po wer 2 5 MICROPHONE Attach the microphone connector to a suitable microphone as shown in Figure 2 Besure that the PTT switch of the mi crophone is separate from the microphone circuit as shown in Figure 3 It should be noted that a microphone with a 3P plug having a common earth terminal cannot be used The microphone input is designed for high impedance 50k ohms microphones only The choice of microphone is im portant for good speech quality and should be given serious consideration The crystal lattice filter in the transceiver pro vides all the restriction necessary on audio response and further restriction in the microphone is n
52. rt distance within several ihundred meters and strong signals of nearby fre quencies are received the wanted signals are blocked Also if the wanted signals are very strong the S meter is scaled out In this instance set the ATT switch to ON The input signals to the RF amplifier are attenuated by about 2 0 dB providing distortionless reception 4 7 RIT By uslng the RIT knob the receive frequency of VFO can be shifted by about i 3 kHz and the frequency of fixed channel by about i 1 5 0 Hz without changing the transmit fre quency II the frequency of the opposlte station is deviated your receive frequency can be set to the statton by turning the RIT switch to ON and using the RIT knob The state of RIT can be checked bh the indicator in the window of the d al 4 8 IF SHIFT By using the IF SHIFT knob during reception rhe pass band frequency of the crystal filter can be shifted by about il 7 kHz because of adoption of PLL Phase Locked Loop circuit in the local oscillator circuit This is one of the major features of TS 820 and can be used in the following cases 1 Adjustment of Tonal Quality and Interference Rejection during SSB Reception When the transceiver is used in USB mode turn the IF SHIFT knob in the direction and the lower frequen cies are cut out Turning the knob in the direction cuts out the higher frequencies these procedures are reversed for LSB mode Adjust the knob so that the to inal qual
53. satisfacto 5 rily For operation of the transceiver on the 10 15 and 20 The following accessories should be included with the trans ceiver meter bands the efficiency of the station will be greatly in creased if a sood directional rotary antenna is used Re 1 Operating Manual 1 Microphone Plug 1 Jumpered 9 pin Plug nstalled 5 RCA Phono Plugs 1 Alignment Tool 2 Plastic Extension Feet with Screws 1 AC Power Cord 1 Speaker Plug 1 8P US Plug 4 Fuse 6A x 2 4A x 2 2 2 OPERATION LOCATION As with any solid state electronic equipment the TS 820 should be kept from extremes of heat and humidity Choose an operating location that is dry and cool and avoid operating the transceiver in direct sunlight Also allow at least 3 inches clearance between the back of the equipment and any object This space allows an adequate air flow from the ventilating fan to keep the transceiver cool 2 3 POWER CONNECTIONS Make sure the POWER switch on the front panel of the TS 820 is turned off the stand by switch is put in the REC position and that the voltage switch on the back of the TS 820 is switched to the correct line voltage 1 2 0 or 220 Connect the POWER cord to an appropriate external power source 2 4 ANTENNA Connect a 5 0 7 5 ohms antenna feediine to the coaxial connector on the rear panel Fixed Station Any of the common antenna systems desi gned for use on the high frequency amateur bands may be used with
54. st the DELAY control The plate current for CW operatlon should be about 200 ma Use the CAR control to adjust the carrler level for CW opcratlon At 2 0 0 ma of IP there may be no ALC read ng OPERATION WITHOUT C W FILTER Set the IF SHIFT knob to its center position and the RIT switch to the OFF position t o receive CW signal Turn the maln tuning knob for about 8 0 0 Hz of beat signal and your tiansmlt frequency will be set to the transmit frequency of the opposite station zeroing During reception the side tone monltor is activated by pressing down the key In this case listen to the side tone signal and the receive signal and adlust the maln tuning knob so that the cycle of the sound is increased By so doing the zeroing of frequencies can be achieved After zeroing set the RIT swltch to ON and turn the RIT knob for the pitch that suits your listening taste When interference is encountered turn the iF SHlFT knob and the interference can be eliminated For more effective CW operation use the CW filter YG 88C option by refer ring to page 34 OPERATION W l T H C W FILTER OPTION Set the transceiver in the receive mode by setting the IF SHlFT knob to the center posltion and the RIT switch to the OFF position Adjust the main tuning knob for maximum de flection of the S meter The pitch of the sound of the receive signal will now be about 800 Hz indicating that the zeroing is completed Turn the RIT switch to ON and adjust th
55. t either pin 3 normally closed to ground during receive or pln 5 J m e n to ground during receive o i the REMOTE connector to the control jack on the amplifier Connect the ALC feedback from the amplifier to pin 6 of the REMOTE connector The output of the TS 820 is quite ade quate to drlve mosl amplifiers to full rated output 4 1 5 FIXED FREQUENCY OPERATION The T S 8 2 0 has a built in crystal controlled oscillator for f xed frequency operation This feature is most useful for commonly used frequencies nets or any situation where crystal controlled operation is required To use the fixed fre quency oscillator turn the FUNCTION switch to the FIX po sition Select one of the four available channels with the f i xed channel selector switch and tune and load the TS 820 as described in Sections 4 1 through 4 1 1 Simply operate the transceiver as described in Sections 4 12 and 4 13 TABLE 4 Meter Switch Positions for Different Modes Recommended monitoring por8t on durmg oneratson MODE TUN CW Crystal S p i l i a t i o n s 1 Type of holder HC 25 U 1 Frequency 5 5 lo 50 MHz 3 Mult l cnl on Fonda nenlal 4 rn rlt rnry lnlerance i0002 A at normal tompcralure Fig 9 Crystal Oscillation Circuit METER Switch ALC or IP or RF or HV ALC or Approx Readlngr Peaked 100 ma 113 scale 800 v None or wlthin ALC range IP or 200 ma RF or I i 213 s
56. t o f f 1 M O D E rwifch ir set to wrong rideband band 2 Replace the CW filter 1 Insert Ihe shunt plug into back panel 2 Release the PTT switch 3 Turn tile switch OFF 1 See Seclion 1 Push R I T button 1 T U M O D E switch to correct ride 1 Replace the relay 1 Repair the PLL unit 1 2 See Section 6 3 1 See Section 6 3 2 Use a s ep up transformer to raise the line voltage An antenna is connected and the calibrator rignal i s received but no r gnalr are heard One or more bands are operating b u t rorne arc not S meter deflects without a received signal SSB received slgnal is extremely hlgh cur lor tow cut 1 Bad T I R relay 1 The PLL unit 8s nor operatng on thedefective band 2 The antenna coil o f the defective band requires alignment 1 I F board is our o f adiurtmenr 2 L o w A C line voltage 1 IF SHIFT is out of adjustmen 1 se I n the center in he pasilion 01 click 1 No drive or intermittent drive on one or 1 PLL unic requires adjustment 1 See Section 6 4 more bandr 7 4 TRANSMITTER SECTION li I Signal reports of dirtortian 1 1 Too much microphone gain 1 Reduce MIC control I Low drive and broad DRIVE tuning on all bandr SYMPTOMS RF m e e r deflects with no outpur In0 piale current ALC meter doer not deflect and there ir output The TS 820 will not ooerate on SSB Ther
57. the IF unit circuit board on the left wall of the transceiver Solder the 4 pins from the rear side using a small size soldering iron Soldering should be finished as quick as possible 4 Change the position of the wnnector IIF2 located at the lower section of the IF unit depending on whether the FSK shift width is 170 Hz or 8 5 0 Hz Only SSB filter used A SSB and CW filters used FSK shift 1 7 0 Hz CW filter used 8 FSK shift 850 Hz ISSB filter used C I gt I 1 1 4 I lt 8 a Green Gray Purple NOTE 1 If you are not interested in FSK operation plug in the connector either to the 8 position or the C position 2 To facilitage the installation of filter and setting of connector remove the 3 screws holding the IF unit fixture to the chassis and then pull the unit upward 5 Reconnect the 2P speaker mnnector in position then replace the bottom cover and the top cover The instal lation of the filter is now completed INSTALLING THE DC DC CONVERTER IDS 1 1 Remove the patch plate located on the rear panel of TS 820 2 Secure the DC DC unlt to the rear panel usrng the four tapplng screws supplled w t h the unlt 3 Select the correct color coded lead from the DC OC unlt rnaklng sure that the color code corresponds to that of the lead connected to the DC OC termlnal board ad
58. the TS 820 provided the input impedance of the transmission line is not outside the capability of the PI out put matching network The transmission line should be of the coaxial cable type An antenna system which shows a standing wave ratio of less than 2 1 when using 5 0 or 7 5 ohm coaxial transmission line or a system that results in a transmission line input impedance that is essentially resisti member that even the most powerful transceiver is useless without a proper antenna Mobile Statlon Mobile antenna installations are critical since any mobile antenna for use on the high frequency bands represents a number of compromises Many ama teurs lose the efficiency of their antenna through improper tuning Remember the following points when using the TS 820 with a mobile antenna The Q of the antenna loading coil should be as high as possible There are several commercial models available which use high 0 coils The loading coil must be capable of handling the power of the transceiver without overheating In the CW mode the power output of the transceiver will exceed 8 0 watts The SWR bridge is a useful instrument but unfortunately it is quite often misunderstood and overrated in importance Easically the SWR bridge will indicate how closely the an tenna load impedance matches the transmission line With long transmission lines such as will be used in many fixed station installations it isdesirable to keep the impe
59. tion USE VOX OPERATION Adlilsl tho transceiver as described in the previous para graph Flip the VOX switch onand close talk into the micro phone increasing the VOX GAlN control until the VOX relay just operates For VOX operation it is desirable to close talk the microphone to prevent background noises from tripping the TS 820 mto transmission Check that the ALC reading for voice peaks is still within the ALC range on the meter If necessary adjust the MIC con trol for a proper ALC reading I1 the VOX clicu t is acttvated by speaker nolse adjust the ANTI VOX control Increase the control as necessary for proper VOX operatlon Do not use more VOX GAlN or more ANTI VOX gain than necessary to control VOX operation If the VOX circuit transfers between words or holds too long adjust the re lease time constant by turning the DELAY control 4 13 C W OPERATION Tune and load the TS 820 as described in Sections 4 1 through 4 1 1 Connect a key to the back panel CW KEY jack set the MODE switch to CW and set the stand by switch to SEND for transmitting CW transmlsslons are automatically monitored through the speaker of the transceiver The aud o galn of the sldetone can be adjusted w t h VR3 on the AF board For semi break in operation turn the VOX switch on Hold the key down and increase the VOX GAlN control until the VOX relay just operates It is desired to change the release ttlne constant of the VOX circuit adju
60. tween the term nal RF1 and the chass s RIT ADJUSTMENT AF AVR UNITI Set the RIT knob to its center position and turn on the RIT switch Rotate the main tuning knob until the marker signal can be heard in suitable beat tone Then adjust VR2 so that the beat tone is not varied regardless of the position of the RIT switch MARKER FREQUENCY C A L I B R A T I O N M A R K E R UNITI The marker frequency is factory adjusted prior to shipment However if it is deviated after a long period of use of the set it must be calibrated accurately TS 820 is designed to re ceive WWV signals so that the marker frequency can be cali brated prectsely Set the BAND switch on the front to WWV and turn the main tuning knob until it is aligned with the 0 on the sub dial A standard 15 MHz WWV beat signal will be received By setting the FUNCTION switch to CAL 25 kHz this beat signal is superposed on the marker beat signal and is heard as a double beat signal Adjust the ceramic trimmer TC1 un til a zero beat is obtained The marker frequency is now fully calibrated COUNTER FREQUENCY CALIBRATION 1 COUNTER UNIT OPTION With the FUNCTION switch in the VFO position turn the BAND switch to receive 15 MHz WWV standard signal By connecting the counter calibration cable suppled to the counter unit and the X VERTER IN jack on the rear panel the WWV beat signal is superposed on the higher harmonics of the standard signal of the counter
61. ty suits your listening preference The IF SHIFT knob is also effective in eliminating interference when the receive s gnals are superposed on nearby signals 2 Adjustment of Tonal Quality during CW Operation For detailed descriptions refer to Section 4 13 CW operation 3 FSK IRTTY Operation at 8 5 0 Hz Shift For detailed descriptions refer to Section 4 19 RTTY operation 4 9 NOISE BLANKER The TS 620 has a sophzsticated built in noise blanker des gned to reduce ingition type impulse noise The noise blanker is particularly mportant for mobile operation When necessary activate the noise blanker circuit by flipping the NB switch up Scl tlre AGC swirch to the position appropriate for the rece ved s gnal Generally for SSB reception set the AGC swtch to SLOW for CW reception set the AGC switch to FAST and for reception of a very weak signal the switch lnay be set to OFF 4 1 1 TRANSMITTER TUNING Connect the TS 820 to a 50 ohm dummy load or a 50 ohm antclxla with an SWR of less than 2 1 before making any transmitter adjustments The life of the final tubes isdirectly related to the SWR of the antenna and to the length of tu nlng periods Refer to Table 2 for the initial switch settings of the TS 820 for transmitting Tune the main tuning knob to the desired ol eratiiig frequency PLATE IDLING CURRENT See Fig 7 Turn lllc lnaln tuning knob to the desired operating Ire quency wltii n the amateur band sele
62. uces the effi ciency of the tubes I FSK NARROW Fig 11 Change of the FSK WIDE NARROW I 1 5 888 2 a lt 8 M lt to lt m lt a t a gt c 4 t gt s TS 820 BLOCK DIAGRAM lt 111 lt lt 888 a lt 089 8 lt w lt gt lt ruw ulurruu s lt lt lt lt lt lt gt u w lt lt w lt U lt s lt s w lt lt lt 8 8 8 a m s 8 ts s SECTION 5 CIRCUIT DESCRIPTIOIU in a st lt e t lt gt an lt lt E E
63. ues maximum deflection on the S meter and then cali brate using the dial pointer In this case the beat frequency is about 8 0 0 Hz CW ftlter Y G 8 8 C is optional extra CALIBRATING THE FIXED CHANNEL A N D VFO FRECIUENCIES Flxed Channel and VFO frequencies can be calibrated at the CAL FIX position of the FUNCTION switch Set the switch to the CAL FIX position and turn the VFO main tuning knob u n t l a beat signal is received in the vicinity of f xed channe frequency Calibration is effected at the zero beat pos tion CALIBRATING THE TS 820 WITH VFO 820 Turn the FUNCTION switch to CAL RMT to calibrate h i TS 820 with the VFO 820 a receiver or another remotr VFO Tune the remote VFO to the frequency selected on t h 7 5 8 2 0 and zero beat the generated marker signal At zerc beat the TS 820 and remote VFO frequencies coincide By calibrating the TS 820 for normal operation as describe previously the TS 820 can be used as a frequency standarci for calibrating the remote VFO 4 5 RF GAlN RF GAlN is controlled by changing the voltage of the AGC c rcu it Adjust the RF GAIN knob so that the S meter doe not cause excessive deflection This minimizes the noise du ring reception and allows the S meter to indicate the correc signal strength For normal operation this knob should be turned fully clockwise for maximum sensitivity 4 6 RF ATT 4 10 AGC AUTOMATIC GAIN CONTROL If the transceiver is operated in a sho
64. used for the counter unlt It uses IC to provlde rated voltage wlthout maklng any adjust ments MARKER 8 0 A R D 1x52 0005 011 The MARKER board holds the 100 kHz crystal oscillator 101 and a 2 5 kHz multivibrator 102 and 0 3 to produce marker signals at 2 5 kHz intervals to calibrate the TS 820 0 4 amplif es the calibrator signal RECTIFIER BOARD 1x43 1090 021 This board holds all of the diode rectillers for the power sup ply section of the transceiver D l through D 4 rectlly the hlgh voltage D 5 rectifies the 3 0 0 volt supply D6 rectifies the 210 volt supply D7 rectifies the 9 0 volt supply and D 8 through D l 1 rectify the 13 8 VDC supply HV HIGH VOLTAGE 8 0 A R D 1x43 1110 001 Thls voltage divider crrcuit s lpplles a high voltage metering s gnal for the HV meter reading and also a low voltage screen source used in the TUN mode of operation INDICATOR BOARD 1x54 1180 00 Thls clrcult controls the light emitting diodes which indicate 1 when the RIT circuit is on when the fixed frequency oscilla tor IS operating or when the VFO is oscjllat ng RELAY BOARD 1x43 1190 001 FINAL BOARD 1x56 12 00 00 Th s unit ncludes all the circuits of the power amplifier of the flnal stage wrth the exception of the pi network clrcuit at the output side Fig 2 2 FINAL Board 5 3 FINAL STAGE POWER AMPLIFIER Thjs ampl f er deltvers 200W PEP tnput by 2 transmli power tubes S2001A It is equlpped w t h a coo
65. wafts DC for CW operation 100 watts for FSK operation 13BV DC operarion 120walls PEP for SSB operatian 90 warts DC for CW operslion 60 wafts for FSK operafion gt 888 888 5 lt 5 t a 8 s SECTION 1 FEATURES z 1111 111111 111 1 888 w a 888 888 w Z lt 1 PLL System H F Band SSB CW RTlY Transceiver checking the modulation condition or adjusting the RF processor This transceiver employs newly developed PLL Phase Locked Loop circuit covering 1 8 to 29 7 MHr WWV 9 Selector Switch for SSB CW Receive 15 MHz for SSB CW and RTTY ooerations Frequency Response 2 Minimum Spurious and Excellent Overload and Crossmod Characteristic The adoption of FET baianced type mixer MOS FET and single conversion system minimizes spurious during transmission and assures excellent overload and cross

Kenwood TS-480 Marine Radio User Manual

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