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FT-102 SG - Fox Tango Yaesu Manuals

1. N 9 o s O n 100 205 des got 8L Zid 2 9 l 4 d DFI S 91 ano E 5 s 9 C97 AP 9 o ant s io 9 D 2 INV Li z db se IL pa 0 2 x o RAUS Gu um 7 X 29v og vll Mn jar MOOS yor I a 5 dS bE m zil 111 o 3 19N v2ee2 8d LINN 3M e OEE O OEE SS LLL LLL Lc sad FI 102 Circuit boards and circuit descriptions by Carol Maher W4CLM and Wim Penders PAOPGA FT 102 RF Unit PB 2342A PB 2355 Final Unit On the Final Unit the transmit signal is brought up to full power at V 9801 to V 9803 6146B before delivery trough the final tank circuit on the main chassis to the Relay Unit PB2354 This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 21 PB 2342A RF Unit Receiver The incoming signal from pin 2 of J 1004 is fed trough RL 1001 RF amplifier on off relay to the preselector circuit selected by the bandswitch Then the signal goes through T R relay RL 1002 to the gate of the RF amplifier Q 1002 AGC is applied to the gate of Q 1001 Q 1001 and Q 1002 2SK125Y are together used as a RF amplifier in a dual gate Fet arrangement not unlike a cascode VHF amplifier in earlier days It combines low noise amplification with large signal handling The signal is then fed throu
2. A OS Y 4 d y wm OFF h COMP y 7 uet Men oc ead 2 j m FAST A 1 10 4 24 5 K RFAMP NAR PROC NB MONI ur i O 7a aaa 1I i BS Re 0 pm ZH u f ALC METER 4 WORM 18 Ps wom AUK 1 I A um 2o Lu f CLAR S TONE WM li NOTCH S APF SHIFT WIDTH 7 RX 0 3 AQ i Pi B z ae Ws t J 9 A MODE AF RhF TUNE fa ow H USB e AM P l NA LSB NN FM EN 7 i a EN U LOW HIGH This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Total IF Flexibility An extremely versatile IF Shift Width system using friction linked concentric controls and a totally unique circuit design gives the operator an infinite choice of bandwidths between 2 7 kHz and 500 Hz which can then be tuned across the signal to the portion that provides the best copy sans ORM even in a crowded band A wide variety of crystal filters for fixed IF band widths are also available as options for both parallel and cascaded configurations But that s not all the 455 kHz third IF also allows an extremely effective IF notch tunable across the selected passband to remove interfering carriers while an inde pend
3. BELELLE 0 ae x e agi 4 s 1 gt h 2 Pas G LN lt w mw LI 4 14 INTR an c qu it a R pe i te ng atl or ap ai ie SERM adio i EP RO Anca iin YAESU AGC titer MY ix 2 A 2 Mic Amp Audio Network Adjustment Vert 2dB DIV Hori 500Hz DIV top curve Low and High maximum mid curve Low and High centered Bet curve Low and High attenuated New Standard of Purity Three 6146B final tubes in a specially con figured circuit provide a freedom from IMD products and an overall purity of emis sion unattainable in two tube and tran sistor designs while a new DC fan motor gives whisper quiet cooling as a standard feature For the amateur who wants a truly professional quality signal the answer is the Yaesu FT 102 ML aM 60 tite HF ALL MODE TRANS CEIVER FT 102 YAESU SP 102 POWER HEATER vox cam pud COM Dh keh ok MON MAP MAR POCO ___ NOISE _ DESIRED SIGNAL Commercial Quality Transmitter The FT 102 represents significant strides in the advancement of amateur transmitter signal quality introducing to amateur radio design concepts that have previously been restricted to top of the line commercial transmitters far above and beyond govern ment stan
4. below One edge on the control will be a chrome gray border and the 2 other border will be a gray against black border This is used to reduce S interference from simultaneously transmitted signals where one is above ait your frequency of interest and the other is below In this instance one filter s edge is used on one side and the other filter s edge is used on the E SAVE opposite side The chrome against gray border is the effect of the 8 2 USB EJ i MHz filter and the gray against black is the 455 KHz filter edge When the gray area is at its widest chrome to gray borders at both sides LSB both filter edges are coincident and the passband of each is the same and they reinforce each other You may find that certain combinations of rotation of each of the 30 friction locked controls to be pleasing to your ears This is then the way ditus oc ei the control should be set for you There is no law that states that both controls must be centered and vertical If you adjust this double ganged friction dual control for the three above variables pleasant sound interference rejection to one side or interference rejection on both sides of your passband you will begin to realize the potential of your 102 and why this control format is the best around I can t begin to tell you how many hams don t understand the concept of the triple function of this control There is nothing else like it in ham radio as the c
5. ta ola ENGL um mua toca E CLAR ve M Me vio cows FAST Versatile Applications The rear panel includes jacks for an ex ternal spotting receiver and separate receive antenna for serious contesting and low band operation while a single AM FM Unit that enables operation on both additional modes is available as an option The ex tensive new line of accessories developed for the FT 102 continue Yaesu s tradition of giving you the choice of the features your operating needs call for without paying for standard features you don t need FV 102DM Synthesized Scanning External VFO The FV 102DM provides the FT 102 with the advanced frequency control necessary for optimum operating convenience espe cially in DX and contest situations where seconds count The PLL synthesizer steps at a 10 Hz rate while slow or fast scanning can be controlled either from the push buttons on the front panel or directly from the microphone connected to the FT 102 e5608 R M oid FMC OS yaa E LJ t 6 E e e a 4 C 8 v lt L TE o e Ta 3 VN j 6 LJ Sree t 7 VOIH Two Tone Output Spectrum Vert 10dB DIV Hori 500Hz DIV 100WPEP 14 25MHz Output f 1500Hz f 1900Hz IF Transmit Monitor An extra product detector allows audio monitoring of the transmitter IF signal which along w
6. 184PM 12 and G2bE 184PHM 12 are not a trouble in fact the references I have put in the table are the ones I was able to locate here in the OMRON Valencia branch The relays which are more prone to fail are the smaller low signal relays so I recommend changing all of them and then checking for correct operation before changing RLO1 in the Relay Unit Fujitsu replacement FBR211 NAD 012 P FBR211 NAD 024 M FBR211 NAD 012 P FBR211 NAD 012 P FBR211 NAD 012 P OMRON replacement G2E 134PHM 12 or G2E 184PM 12 G6A 234P ST US 12 needs rewiring G2E 134PHM 24 or G2E 184PHM 24 G2E 134PHM 12 or G2E 184PM 12 G2E 134PHM 12 or G2E 184PM 12 G2E 134PHM 12 or G2E 184PM 12 EB5AGV s FT 102 relay substitution TUTORIAL One of the best known troubles of the FT 102 is the long term life of its relays All FT 102s are at least 15 years old Relay technology and prices has changed a lot in these years The standard FT 102 relays were made by Fujitsu except for RLO1 in the Relay Unit and were not sealed So dust could get into them and finally make them fail You can easily find if your FT 102 has flacky relays when you go from transmit to receive and you get a deaf receiver that is Also if you toggle the RF amplifier you could get similar results There are some relays which do other tasks in the rig as RLO1 in the IF Unit which switches the S meter from receiving signal level RX mode to ALC TX mode RLO1 in the Lo
7. From the early 1950s until at least the 1980s the 6146 found its way into virtually every manufacturer s line of transmitters In fact during the early 1960s RCA had a series of advertisements on the back cover of QST that listed a different manufacturer s equipment that used the 6146 each For example when the 6146B was used in the Collins 32S 1 32S 2 32S 3 32S 3A KWM 2 and KWM 2A it was discovered that the components in the neutralization circuitry burned up in a very short amount of time Thus Collins had to retract the statement that it was OK to use the 6146B Then due to the fact that the United States military establishment wanted to standardize on the 6146W equivalent of the 6146B the neutralization components had to be redesigned to allow the 6146B to be used Fortunately these changes did not affect the use of the earlier 6146 and 6146A in those transmitters manufactured to use the 6146B All three types of tubes may be used without any problem in these transmitters Replacing the 6146 6146A tubes with 6146B types often results in spurious emissions parasitic oscillations etc This is due to the fact that there are different bias requirements dif ferent inter electrode capacitances etc of the 6146B versus the other two It is often difficult to neutralize 6146B tubes when used in place of the 6146 6146 If neutralization can be achieved often it lasts for just a few minutes before the tube s goes into o
8. RLO2 RF Unit PB2342 This single relay in the FT 102 that stirs up the most controversy among those in the FT 102 community of users is that of RLO2 on the RF unit as it is no longer available Originally made by Fujitsu of Japan relay type FBR221A DO12 is shown below Two schools of though currently exist for repair or replacement of this relay Currently however the club has a complete relay kit available for the FT 102 Less RL1 amp RL2 See Fox Tango Candy Store for the FT 102 relay replacement kit Check for availability as we only have a limited supply of original Fujitsu relays in a complete relay kit if you are in need of this part Yaesu part number for this item was P N 70000031 BR221D012 12v they also made a 9 volt version of this relay P N 70000034 BR211AD009 M 9v which could be modified for use in place of RLO2 with a 3v voltage drop on RLO2 installed on the RF Unit PB2342 the coil if it becomes necessary to resort to this Fujitsu type FBR221A First school of thought on this comes from Jose EBBAGV EC5AAU in Spain Jose has come up with a most ingenious way of changing this 12VDC Relay RLO2 Original FBR221A D012 relay over to a more commonly available Omron relay G6A 234P See Jose s tutorial for relay replacement Board Qty EB5AGV s FT 102 relay substitution TUTORIAL RLO2 RF Unit 1 You have got to give Jose credit for investigating a suitable replacement and in his ability to come up with a creative process for replacement
9. Scope display of a properly tuned and operating FT 102 on AM The key down surge starts at over 200 watts and stays at over 160 watts for 250 milliseconds mS and then gradually subsides over another half second After the modifications described below there is a minor peak represents dynamic headroom of the amp to about 60 watts and then back to normal carrier within 30 mS of keydown This very small surge will not trip any linear amp protection circuits Figure 2 Scope display of the power surge before modification at left after modification on right The Modifications Starting from an unmodified radio and FM AM Unit PB 2347 cut the wire going to pin 1 of P60 J01 Leave enough room about 2 inches to solder another lead to it and insulate the other cut end which carried the old 8 volt supply to pin 1 so it doesn t short out Then go to the AF Board Unit PB 2344 and pick up a lead from pin 2 of J15 P38 This is noted to be a 12 Volt AM line It is energized only when in the AM mode and is on continuously in both receive and transmit It is not on in FM or any other mode This will be your new power source for the AM unit but it must first be converted to 8 volts I recommend using a 7808L regulator cost is well under a dollar to bring the 12 volts to 8V The photos below show where and how to install the 7808L on the FT 102 Overshoot Fix by Mal NC4L Editors Note This is a fix to the overshoot modif
10. and transmit receive Main VFO memory selector buttons to allow any combination of frequency controls The VFO dial can also be activated as a clarifier for a selected memory while the five digit fluorescent display shows the operating frequency with resolution to 10 Hz if desired FC 102 Antenna Coupler The FC 102 is a newly designed antenna tuner ideally suited for use with the FT 102 station With a power handling capability of 1 2 kW the bandswitched L C pi network will match a wide variety of antennas including a single wire to your transceiver or linear amplifier on all HF amateur bands New design features in clude an in line wattmeter with three ranges 20 200 and 1200 watts full scale and a peak hold system that enables the operator to observe peak power with ease A separate SWR meter is also built in for antenna tuning indication The FC 102 includes internal relays to provide low loss pushbutton selection of two different antennas and two transmitters while the optional FAS 1 4R Remote Antenna Selector may be mounted either inside the FC 102 or right on your tower to allow selection of four additional antennas When remotely installed the FAS 1 4R is con nected by a control line to the FC 102 eliminating the need for costly multiple YAESU TUNE FV 102DM M CHANNEL P erand ANS YAESU mecuve SS ES ES vio Ma mm SS e TRANSMIT PSI lt 0 i
11. transformer is rectified by D 8505 VO6B and filtered by capacitor C 8509 where the filtered 15Vdc from bridge rectifier D1 is added to result in about 26Vdc This voltage 71 With contributions This manual is a courtesy to you from from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 27 Yaesu FT 102 Line Accessoires SP 102 External speaker External speaker with a large 120mm HiFi speaker and a selectable high cut and low pass filter allowing for 12 different frequency response curves With headphone connector 2 front selectable inputs SP 102P External speaker Phone Patch Combines a communication quality speaker response with a hybrid phone patch with a line meter gain control This type has no selectable input or a selectable audio filter FV 102DM External synthesised VFO Combines a advanced frequency control to the nearest 10hz and a programmable 12 frequency memory for optimal operating convinience ideal for contests or DX hunting The PLL synthesizer steps in 10hz rates with slow or fast scanning mode that can be used from the frontpanel of the FV 102 or direct from the special scanning handheld microphone The memory frequencies can be entered direct from the FT 102 or from the FV 102 There are additional controls for the scanning rate 5 or 20 khz VFO dial lock mode last digit blanking transmit receive split from VFO or Memory The VFO dial can also be used as c
12. 5 dBM That is noteworthy L3 2 EM E EN NNUS because no other radio has equaled or exceeded that i i figure as of December 2003 The 102 utilizes three 6146B tubes for the finals This enables the 102 to key down over 175 watts in CW and over 200 Watts peak envelope power in SSB As opposed to transistor finals PEP can be higher than Key Down power with tube finals because the High Voltage capacitors charge to a higher voltage during the pauses between words and syllables This is also responsible for the fact that the 102 when properly adjusted can yield 110 modulation in AM and the transistor finals in today s radios just can t do that With the usual transis tor final in today s radios AM modulation is ordinarily 50 Did you know that the percentage of AM modulation is responsible for your apparent loudness and the carrier or unmodulated power is responsible for quieting the background noise The best situation for getting thru and being copied is at 100 or slightly greater modulation The 102 does not have a synthesizer and therefore reciprocal mixing products resulting from the synthesizer noise mixing with strong signals above and below the listening frequency will have no effect on the listening frequency This manual is a courtesy to you from with contributions 30 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers down for more than ten seconds but many forget that they must sta
13. 6 Mhz signal to counter sample mixer Q 4030 3SK73GR which also receives the VFO signal after lowpass filtering The resulting 0 5 to 1 0 Mhz mixer product is passed through another lowpass filter before delivery from pin1 of J 4013 to the Counter Unit A clock signal for the Counter Unit is also derived from 10 Mhz reference oscillator Q 4026 after division by 10 at Q 4019 further division by 40 and Q 4020 see PLL description buffering by Q 4031 2SC945Q and lowpass filtering This 25 khz signal is brought out for the Counter Unit at J 4013 pin 3 while a portion of the unfiltered Signal is delivered from J 4014 to the receiver input at the EXT ANT jack on the rear panel providing a MARK Signal for the receiver when the MARK button is depressed Second reference divider Q 4020 also provides a 100 Khz signal delivered from J 4015 to the EXT VFO jack and the ACC 1 receptable on the rear panel This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 25 output from PLL mixer Q 4012 is then passed through a bandpass filter and buffered by Q 4014 and Q 4015 2SC535B before being fed to programmable divider Q 4017 74LS192 Q 4017 is programmed by bandswitching signals to provide a output of 500 khz regardless of the operating frequency This output is applied to phase detector Q 4018 MC4044 which also receives a 500 kh
14. BOARD PIN 2 OFJ15 rus r 2 7808 REG Figure 9 Solder the connections shown and described in the text above and you are almost done 2 era ee the amp two p JI gt v a Figure 10 View of the back side of the completed AF Board PB 2344 This manual is a courtesy to you from 40 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Unsolder the old bulbs 5 from the posts Be careful not to use too much heat or the plastic will melt and the pins will migrate or fall out A hemostat or small needle nose pliers 5 will help you remove the wires from the pins Use these to grasp the wire firmly at the end closest to the post Heat the joint and when the solder begins to melt firmly pull the wire off the post 5 Carefully remove the blue plastic boot on the old bulb If you have bulbs with the boots installed these next few steps are not necessary so proceed to the fourth paragraph down which starts with Grab the lead Method 1 6 Shimmy the open end of the old boot back across the bulb by grasping the bulb and boot bet ween your thumb and index finger Hold the lead to the bulb with a hemostat so that you have something to pull against Work one edge at a time first your thumb and then your index finger like swimming or climbing down a ladder Be gentle at first and then apply more pressure if it doesn t move It should move only a small but visible amount each time
15. FM equipment manufacturers used these tubes in all sorts of FM communications equipment for both low band 30 50 MHz and high band 150 8 172 MHz This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 47 month There are actually three distinctive variants of the basic 6146 The 6146 6146A and 6146B It is unfortunate that the 6146B was called the 6146B for it is really a different tube from the first two Primarily the difference between the plain 6146 and the 6146 is the makeup of the heater filament The 6146A has what RCA calls the dark heater This dark heater is supposed to be more resilient to vibration work well at a larger range of voltage etc Otherwise the 6146 and the 6146A are the same tube In mid 1964 RCA introduced the 6146B with the claim of 33 33 percent higher power input than the 6146 6146A Also it was claimed that the 6146B could be directly substituted for the earlier tubes The 6146 6146A had a maximum rated power input Many amateurs are aware that the military ruggedized version was designated the 6146W I will get to these tubes a bit later However RCA also introduced in the early 1960s the 8298 tube for use in commercial mobile equipment The 8298 is just a heftier 6146A Motorola General Electric and quite a number of other commercial FM equipment manufacturers
16. Tango International with contributions 22 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Transmitter The double sideband modulated signal from the AF Unit is buffered by Q 2005 2SK19TMGR and passed through ceramic SSB filter CF 2001 to mixer Q 2017 3SK73GR unless the speech processor is on in which case the filtered remaining sideband from CF 2001 is amplified by second IF amplifier Q 2017 also used in the receive path and Q 2015 2SC1815Y a portion of the output of which is diverted to amplifier Q 2023 2SC1815GR for COMP indication on meter I The remainder of the output from Q 2015 is clipped by limiter amplifier Q 2016 TA7060P before being applied to mixer Q 2017 3SK73GR The 8 7 Mhz second LO signal from the Local unit is mixed with the modulated 455khz signal at Q 2017 to produce an 8 2Mhz IF which is then filtered trough XF 2001 in the first bank of filters and amplified by Q 2003 also used in receive before delivery to the RF unit Monitor A portion of the output of IF amplifier Q 2003 is buffered by Q 2024 2SC380TMY and fed to the transmit monitor mixer Q 2025 2SK19TMY which is also fed the second Transmit LO signal from the Local Unit The 455khz output of Q SSB Mode 2025 is then demodulated at Q 2026 2SK19TMY The speech signal from the microphone jack is amplified which is also fed a portion of the third LO signal from by Q 3001 2SC732TMGR and Q 3002 2SC181
17. and many other FT 102 lovers 6146 tubes and Equivalents 6146 Anode dissipation equivalent with 25W 6293 a heavy duty pulse tube 5 10x longer lasting 6146A Anode dissipation 25W eguivalent with 6146W 7212 6 3V heater 8298 6 3V heater 8552 6 3V heater QE 06 40 6 3V heater 6883A 8032 12 6V heater QE 06 40F 12 6 V heater QE 06 40K 13 8V heater QE 06 40H 26V heater This last ones are European types produced by Philips and Mullard 6146B Anode dissipation 35W eguivalent with 6007777 6 3V heater when produced after 1962 the 6146W is equi valent with 6146B before that year they are either 6146A or 6146B s check the date tag or compare the anode construction 8298A 6 3V heater YL 1370 6 3V heater 6883B 8032A 12 6V heater 8552A 12 6V heater YL 1372 12 6V heater Because Yaesu uses a 12 6 Volt tap on the transformer its is possible to use 12 6 Volt tubes too by rewiring the heaters in parallel instead of In series 73 Wim PAOPGA This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos 85 6 Wim PAOPGA and many other FT 102 lovers 49 complaints from their service stations about exactly the same problem It cost Motorola one heck of a lot of money to pay the warranty claims because they had tried to cut costs by eliminating the earlier type of tube They had to re box all of the 8552 tubes that had been put into 8032
18. and yields 10 dB of compression It will give you more punch but with some mild loss of quality CW TRANSMIT Some of the earlier models of the 102 had a problem with Key Clicks on CW By serial number 050xxx Yaesu had it cleaned up Let me suggest that when working CW and after you tune the transmitter cut the Drive control back until the ALC no longer comes up off the peg At the same time make sure you still have maxi mum power output It is an easy adjustment with the two meters and the Drive control This will give you very sweet CW characteristics with beautiful shaping of the leading and trailing edge of your CW note This will eliminate Key Clicks in the early models and make the later models sound even better If you follow the suggestions above your 102 will be the most reliable radio you have ever owned with the only upkeep being tube replacement every five to ten years under heavy usage You will also get the best performance possible from your rig Thanks for looking this over Enjoy your 102 and get a hold of me if you need any questions answered 954 961 2034 in the evenings 73 de NC4L This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 33 that point where the counter at one counting updated five times per second sees either of the two rounded readings and can t quite decide into which number it should
19. boxes and get in a rush shipment of 8032 tubes The whole problem stemmed from the fact that the B series of tubes is not the same as the plain and A series The parasitic oscillations were caused by the different bias requirements and by the fixed neutralization of the driver and or amplifier tube in the Motrac There was no practical way to change the circuitry to handle the B series tubes Also making such a change would void the type acceptance of the units In a practical sense it is OK to mix 6146 and 6146A tubes since the primary difference is in the design of the heaters But NEVER mix 6146 6146A tubes with a 6146B This is really asking for trouble Also in a number of transmitters and transceivers especially the Heath SB Line the heaters filaments of the pair of 6146 tubes are in series In these units it is very easy to change the heaters from series to parallel and substitute the 6883 6883A 8032 tubes The 12 volt equivalent tubes are often available for pennies because of the vast number that were used in the commercial FM market I have done this with my Heath SB 110A and it works like a champ If you every want to change back it is a very simple operation to do so I know that there are amateurs who say that they have used the 6146B tubes in place of the 6146 6146A without any problems I can definitely believe that But I have seen
20. carrier signal from carrier oscillator Q 3026 buffered by Q 3029 2SC380Y also on the AF Unit The modulated AM output is then delivered through IF amplifier Q 2003 on the IF Unit to the final transmit mixer Q 1008 on the RF Unit as for SSB and CW and final amplification is the same s i BET da M i vt e A 2 v Are TI 02 S da PB 2345 LOCAL UNIT Bandswitching signals from the BAND selector are delivered through the Counter Unit to J 4001 on the Local Unit selecting one of the six VCO s Q 4001 Q 4006 2SC945Q for the band of operation The selected VCO oscillates at the first LO frequency and provides output through buffer Q 4007 2SC535B to buffer Q 4008 2SC2407 which is also controlled by the unlock signal Q 4008 provides first LO output at J4002 for delivery to the RF Unit A portion of the VCO signal is buffered by Q 4011 2SC535B and applied to PLL mixer Q 4012 SN76514 which also receives a 13 715 to 34 215 Mhz PLL Local signal from buffer Q 4013 2SC535B whose frequency is determined by the band mode IF shift and VFO setting for the operating frequency The 1 0 to 4 0 Mhz CW Mode The CW carrier is generated by crystal oscillator Q 3026 2SK19TMGR activated by analog switch Q 3019 in the CW AM and FM modes through Q 3029 2SC380TMY and applied through amplifier Q 2003 on the IF Unit to balanced mixer Q 1008 on the RF Unit as for SSB operation Final amplification is th
21. complaints that virtually every Motrac unit that was received by customers arrived with one or both tubes broken Prior to this we had never had a single complaint Upon investigation we found that the 8552 tubes had so many parasitic oscillations that they were getting so hot that the glass envelope was being annealed This was happening within a minute or two of tune up and final quality control When the radio was subjected to normal vibrations of shipping the glass envelope of the tubes was being shattered This was reported to Motorola At first they refused to believe us saying that we must have gotten a bad shipment of tu bes But within a couple of weeks they received over 1000 When the 6146B was introduced RCA announced the 8298A commercial equivalent of the 6146B In fact most of the RCA 6146B tubes were cross branded with the 8298A number in addition to the 6146B Those companies who were manufacturing 6146 series tubes for the military changed from the plain 6146 to the 6146A to the 6146B as the military decreed However all of the tubes manufactured under military contracts were known as 6146W and to my knowledge nothing was done towards marking the tubes as being equivalents of the 6146 6146A or 6146B The only way of telling is from the date code which is printed on each tube Different manufacturers changed tube types at different times Also I know of no master list telling on what date a particular
22. contributions AF Board Unit PB 2344 Connect this 8 volt line to the wire from pin 1 of P60 and it is done This will give you constant 8 volts at pin 1 of plug 60 but only in the AM mode and will be activate in both receive and transmit This power line will not be active on FM or any other mode so that AM cannot int erfere with FM functions since it will not be switched on The nice thing with this modification is that this modified radio and the unmodified boards are both forward and backward compatible T i 4 P L f a I 3 E v i 5 Figure 3 The regulator 7808 will be placed in the upper right hand corner of the AF Board I iw p z F E i L P Figure 4 There is a little unused real estate just above the mounting hole This manual is a courtesy to you from from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 39 with contributions Figure 11 Reinstall the AF and AM FM boards and test Again note the orientation of the 7808 at the time of final installation in the photo The plastic part with writing should face toward the PA board Conclusion The FT 102 is a great rig for AM FM CW and SSB The mods above will make it a much better performer on AM especially when using it with a linear amplifier If you are interested in more information and other modifications on the FT 102 please visit my Web page at www
23. end of D36 It could be on D35 36 37 or 38 as all the cathodes of these diodes are tied together on the local unit The other end of these diodes goes to P40 J01 which then goes to the band switch 10 meter positions This manual is a courtesy to you from With contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 17 RLO1 of the PA board should be bypassed Yaesu initially placed it there to switch the screen voltage to a lower value when on ten meters for better efficiency The relay was inconstant and gave them troubles so they just left it in the radio without switching it on or off Since they didn t make the radio with RLO1 active for regular production they took it out of the schematic so you will not see it although it is most certainly there It was easier to erase it from the schematic than alter and redesign the boards So just take the orange and white wire and place it on the other side of the relay so there can be no problems Finally One last thing regarding that 12v 24v relay modification on the RF Unit If you would like to see what it is we are talking about here down load and print out the following PDF for your files See RF Unit 12volt Vs 24volt relay modification RLO4 and RLO5 Our suggestion to you regarding this modification is if what you have now installed in the rig is working leave it alone if it works don t fix it I hope this helps you out a bit If you have an
24. go then take a break or proceed to the RF Unit New Fujitsu RLO2 Installed RF Unit You get to the bottom of this board by carefully pulling the AF board back I work with the rig flat on the desk and when I put in a relay I held it in place with my finger put a small piece of solder near the relay leg and tack solder one leg in first Push up on the relay and then solder it again then do the rest of the leads DO NOT bend the relay legs to keep it in place This will make it very difficult if you ever have to replace them down the line and will ruin the board if you have to take one out again some time in the future For more info on replacing FT 102 relays visit Jose s web page for how to do this as he has some good pictures on his site http www jvgavila com ft102 1 htm As for RLO5 under the band switch I ve heard of different ways of getting this relay in and out All agree that you have to unsolder each leg on the front two band wafers on the band switch I personally don t mind doing a little extra work and taking my time doing so in order to do a job right I disconnect the loading shaft and pulled it out also disconnected the plate shaft and pulled it loose from the front Then I removed the three screws on the front panel right side this will allow you to pull the front of the radio forward about 1 4 to 1 2 of an inch For the few extra minutes in doing this it gives you a lot more room to work with from the front of the ri
25. in less time but as this repair should last several years it pays to do it without hurry Anyway this is a hobby Well first step is to undress the rig i e pull out covers First the top cover and then the bottom one Setup a good workbench space A desoldering station mine is shown in the picture is a really nice tool for this work RL1005 Replace RL1001 1003 and 1004 which are easy to access Note that the last one is 24VDC As you can see RL1005 is almost hidden by a rotary switch attached to the BAND knob In order to change it we will need to unsolder this rotary switch along a bridge which is just over it LL E 2 i LU i Fam ur W A NV Ld LAM is E E DA Im y 2 23 Sx 4 L 2 LI M ps AV 4 d 5 hj E Unsoldering to access RL1005 Then unsolder all the pins of the relay and carefully pull the rotary switch to free it This could take some time patience pays Put the rig upside down as shown below FT 102 upside down RF UNIT RELAYS We will start with the most conflictive relays those in the RF unit In order to access to the solder side of this unit we will remove the AF unit 4 screws and the RF unit shield 2 screws Then put the rig over its side with the AF unit hanging on its wires FT 102 ready to start repair We need to locate the relays in the R
26. jack through a low pass filter The 13 715 to 14 215 Mhz output from pre mixer Q 4024 is then filtered through a bandpass filter composed of T 4001 through T 4003 before being delivered to the PLL mixer for the bands below 14 Mhz For operating on the bands above and including the 14 Mhz band the 13 715 to 14 25 Mhz filtered signal is applied to PLL local second premixer Q 4025 3SK73GR which also receives a 10 Mhz signal filtered through bandpass filter T 4011 for operating frequencies between 14 and 21 Mhz or a 20 Mhz signal from times 2 multiplier Q 4029 2SC945Q for operating frequencies on or above 21 Mhz Both the 10 and 20 Mhz signals are derived from 10 Mhz crystal oscillator Q 4026 through buffer Q 4027 2SC945Q The output from the second premixer Q 4027 is then passed through one or two bandpass filter networks composed of T 4004 trough T 4006 or T 4007 and T 4008 for the 14 and 18 or 21 24 5 and 28 Mhz bands respectively The filtered output from the appropriate bandpass filter is then buffered through Q 4013 and applied to the PLL mixer Q 4012 as before Frequency and filter selection is made through diode switches by commands from the BAND selector with contributions Preset data for Q 5007 is furnished by the bandswitch through encoders Q 5012 and Q 5013 MC14081B and by the mode selector through Q 5011 MC14011 fora 700 hz CW shift and plus 500 Khz for appropriate band selections Digit driver Q 500
27. meter housings acts to baffle the light and put everything back together don t forger to reattach the connectors to the speaker and VERY gently tighten the handle cover screws It is important to remember four things A Don t apply too much heat to the posts B Don t over tighten the handle cover screws just very slight pressure or they will crack C Be very gentle but persistent in removing the blue plastic boots from the old lamps D If you have no audio from your radio s speaker check that you reattached the speaker leads These instructions should get you thru the procedure without a mishap 73 and good DX and if you need help call 1 954 961 2034 in the evenings By the way if you need the photos enlarged contact me via email at NC4LMal aol com and I can send you the nice large copies 73 de NCAL Mal This manual is a courtesy to you from With contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 41 EB5AGV s FT 102 page Keep them glowing You find Jos on his webpage http www jvgavila com ft102 htm This page is devoted to the Yaesu FT 102 HF amateur bands dual conversion transceiver It is an hybrid transceiver as it uses solid state circuitry in all stages except the final power amplifier 3 x 6146B and driver 12BY7A Conservatively rated at 100W it is able to put more than 200W if tuned for maximum output At 100W you can expect really lo
28. of seer uaa This hard to find relay The second school of thought on this matter comes from NC4L Malcolm Mal the undisputed guru of the FT 102 here in the United States Mal has come up with an very intricate restoration process where by he finalizes the restoration by gold plating the relay contacts See www members aol com NC4LMal This procedure while time consuming manages to leave PB 2342 in it s original condition without modification The following I received from Mal in an Email 1 21 06 The procedure starts with the removal of the top of the relay and placing the relay in an ultrasonic cleaner to remove any particulate matter The relay is then dried After this the arms holding the contacts are bent back with special tools to expose the surfaces of the contacts The small needle nose pliers that I use for this had to be fashioned with a Dremel tool and high speed diamond wheel which I used to get a rounded surface for the side of the pliers jaw Without this remodeling the flat surface of the jaw and the sharp angle at the side of the jaw leaves a crimp in the copper arm holding the contact This crimp damages the arm and eventually causes the arm to fall off with the repeated flexion that comes with the operation of the relay With all the contacts openly exposed they are physically cleaned with a soft brass brush and the high speed Dremel tool until all the foreign eh v f matter is removed and the contacts are made
29. performance the FT 102 s unique blend of crystal and ceramic IF filters plus audio tone control provides very low phase delay reduced passband ripple and hence increased recovery of information Price And Specifications Subject To Change Without Notice Or Obligation This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Introduction by 64 The Yaesu FT 102 was introduced in 1982 as the next descendant of the immensely popular FT 101ZD and FT901 902DM series transceivers The new Yaesu FT 102 was setting another milestone in Yaesu s very successful line of HF transceivers together with and the demand for transistor PA s forced Yaesu to close production of the FT 102 in favor of the new FT 757GX I don t know how many of the FT 102 were produced but they are a rather common find on the internet auction sites altough for a rather high price And prices tend to go up every year So if you be able to obtain one in good condition at a fair price Grab it you will not be sorry and if you want to sell it later it will bring back your money if not more OK there are some issues with the signal relays in this sets but they are still available and not difficult to replace If you replace them with miniature Teledyne relays there are no problems anymore in your lifetime For the rest Every Oldtimer needs some attention
30. sealed 12vdc relay which can easily be found in the United States There has been some discussion as to a modification where RL 04 and RL 05 on the RF Unit are wired together in series for 24Vdc operation There is some controversy about this as to wether or not one should use the 24 Vs 12 volt relays My gut feeling on this is to leave the relays as original set up for 12Vdc After discussing this subject with Malcolm NC4L the FT 102 Guru here in the USA he believes the 24vdc modification to the RF Unit was used for a ballast for the front end supply In other words instead of using the 12 volt supply for the relays they found that the DC for the front end was better slightly loaded down The circuit for the 24 volts is not the most sophisticated or precision item as it is only zener regulated As per Malcolm they looked around and figured lets power two relays with the front end supply so that the energy for the loading effect at least has a useful purpose I am pretty sure that was the case as they certainly have an ample amount of 12 volt power to run the relays My gut feeling on this subject is to leave the rig alone if it s wired for individual 12Vdc relays and the transceiver remains operation then don t fix what is not broken Other Cross References for the G2E FUJITSU FBR211SC SE OEG OUA OUAZ OUA SS 124D SIEMENS A B201 V23101 GEI LS1 012 6L1S Foxtagno org RF Unit PB 2342B 12 VDC Relays RLO1 RLO3 RLO4 RLO5 1
31. several patch wires are soldered in place Unfortunately these wire paths now cross over one another when they should not This reduces the performance of the front end because of cross modulation and signal leakage I have photos of a board where this abomination was performed and a comparison board to show what the final product of that effort looks like in relation to the original design If you are interested in those photos check my website at www members aol com NC4LMal By the way if you have ever tried to solder a small wire to the underside of a small plastic socket with lead spacing of 0 1 inches expect a lot of melted plastic and its fumes You will need a very fine soldering pencil tip and very small gauge solder along with the vision of a preteen RLO1 on PB 2355 of the FT 102 is for all practical purposes worthless if 2U 112P US it becomes intermittent or problematic just get rid of it or by pass it I ra removed it from my transceiver and the rig is all the more reliable Relay Unit PB 2345 RLO1 antenna T R relay Relay Unit PB 2345 antenna T R relay original RLO1 on Relay Unit Omron was the G2U 112P 10V the relay has a coil rating of 5 to 24VDC according to the Last data sheet from Omron dated 1983 See Omron G2U data sheet I recommend you down load and save these data sheets because they will soon become lost in the archives of life never to be found again I obtained these after many hours of searching and letter writ
32. so keep working at it with persistence and it should come off Method 2 roll the open edge old boot back while turning it inside out forgive me but as in removing a condom These two procedures are the hardest part of the replacement It may help if you place the old bulb in some soapy water if you have no success with either method the first time Then rinse and dry the blue plastic boot and place it onto the new lamp Grab the lead from the new bulb blue boot installed with the very tip of the hemostat 7 and wrap it around the post Do the same on the other side of that bulb and then do the other meter Adjust the position of the bulb until the filament is in a position midway between the two posts and then solder the lead to the posts at all four positions An easier way is to tack the wire onto the post with solder and clip the left over lead Then take some scotch tape and rub the sticky side of the tape along the blue plastic boot to remove any dirt or fuzz from the plastic boot Now clean the meter face and the meter cover both inside and out and replace the clear plastic cover by snap ping it into place Apply some scotch tape along the bottom of the meter to seal it from dirt and cover the small hole in the front of the meter housing with the same piece of tape This edge of the tape should be trimmed with a scissors prior to covering the hole so that it just fits over the hole Reapply the brown tape to the underside of the
33. this 10 54 VCXO Q 410 54 VCXO Q 4036 2SC945Q is buffered by Q 4037 2SC945Q and applied to second mixer Q 4038 3SK73GR which also receives a signal from 19 215 Mhz VCXO Q 4033 after buffering by Q 4034 2SC945A The 8 67 Mhz output from mixer Q 4038 is then buffered by Q 4039 2SC945Q and passed through a bandpass filter for delivery to the IF Unit from J 4008 and to the AM FM Unit from J 4009 The 455khz third LO signal is derived from 10 Mhz reference oscillator Q 4026 and 10 54 Mhz VCXO Q 4036 The 10 Mhz signal after buffering by Q 4028 and division by 10 at Q 4019 see PLL description has its 1 Mhz square pulse signal filtered through a bandpass filter composed of T 4012 and T 4016 to provide an 11 Mhz Signal for third LO mixer Q 4040 3SK73GR Q 4040 also receives a portion of the buffered 10 54 Mhz signal from Q 4037 thus providing an output at 455 Khz buffered by Q 4041 2SC945Q and passed through a lowpass filter for delivery from J 4011 to the AF Unit This unique frequency derivation scheme allows the shift function to tune the second LO at 19 215 Mhz VCXO Q 4033 while the width function sychonously tunes the second LO and third LO commonly derived from 10 54 VCXO Q 4036 Sample data to the Counter Unit for frequency display is derived from both the VFO signal and the 10 Mhz reference oscillator Q 4026 Reference divider Q 4019 provides a 2 Mhz square pulse for this purpose which is filtered at T 4013 to provide a
34. which utilizes the cascaded IF filters to provide intermediate bandwidths such as 2 1 kHz 1 5 kHz or 800 Hz simply by twisting a dial The Variable Bandwidth System is used in conjunction with the IF Shift control which allows the operator to center the IF passband frequency response without varying the incoming signal pitch Wide Narrow Filter Selection Depending on the exact combination of optional filters you choose a variety of wide narrow operating modes may be selected For example you may set up 2 9 kHz in SSB WIDE 1 8 kHz in SSB NARROW then select 1 8 kHz for CW WIDE and 690 Hz or 300 Hz for CW NARROW Or use the Variable Bandwidth to set your SSB bandwidth and use 600 Hz for CW WIDE and 300 Hz for CW NARROW No other manufacturer gives you so much flexibility in selecting filter responses Variable Pulse Width Noise 81301167 Ignition noise the Woodpecker and power line noise are modern day ene mies of effective Amateur operation The FT 102 Noise Blanker offers improved blanking action on today s man made noise sources though no blanker can eliminate all forms of band noise for more solid copy under adverse conditions Low Distortion Audio IF Stage Design Now that dynamic range stability and AGC problems have been largely elimi nated thanks to improved technology Yaesu s engineers have put particular attention on maximizing intelligence recovery in the receiver While elementary filter cascading schemes often degrade
35. 12 1281 MAX A 32 PC idis al mo riv et not s n 7 ed height i in 2 27 06 socket TA 34 8 Wiring Diagrams Bottom Views 4 Pole With contributions Installing those new relays in your FT 102 For those who have bought the FT 102 relay kits Here are some hints to do the job Please do not consider these to be step by step instructions however my notes may help you do the job Basically replacing the FT 102 relays is not a difficult job to do except for one relay that sits under the band switch RLO5 on the RF Unit My advice on doing the job is TAKE YOUR TIME DON T be in a rush Do the RLO1 in the PA compartment one evening Loosen up the screws on the rear panel that hold the rear panel to the chassis This will allow you to pull the panel out about 1 4 to 1 2 inch This gives you some room Needles to say remove all the covers for first then the PA tubes and set them all aside There is one yellow wire at the bottom of the Relay board if you want you can unsolder the yellow wire and this will allow you to pull the board up some so you can work on it don t pull on the wires any more then you have to Replace RLO1 T R relay andthen reverse the process Take your time and only do that one relay part of the job then set it aside until you get the time to come back don t try and do it all at once Reassemble everything and test the rig after you change RLO1 on the Relay unit antenna T R relay test the rig and if all is a
36. 2 3 If you are looking for this relay check the following sources Ken s Electronics See Ken s Electronics R12 17D3 12 term 12VDC 5A104CMEWB 104DO 12V FRL263 DO12 04CS KHU4D12 MAT4B BR MY4 DC12 Q22 1936 R14 12 Walco Industrial Electronics Mouser com Notes NOTE VEVER USE A FILE TO CLEAN A RELAY CONTACT USE COURSE PAPER OR A RELAY BURNISHING TOOL If we have not provided you enough information on relays you might like to download the handy Relay Cross Reference Guide from Greenwich Electronics Finally 12v Vs 24 volt relays on the FT 102 RF Unit There is some controversy about this NC4L Malcolm and I had several email exchanges about this and I agree with Mal on his thoughts regarding the Yaesu 24 volt relay modification for the RF Unit My gut feeling on this is to remove the modification and leave the RF unit as it was from the factory This from Mal My feeling is that it was used for a ballast for the front end supply In other words instead of using the 12 volt supply for the relays they found that the quality of the DC for the front end was better slightly loaded down Remember the circuit for the 24 volts is not the most sophisticated or precision item as it is only zener regulated They looked around and figured lets power two relays with the front end supply so that the energy for the loading effect at least has a useful purpose I am pretty sure that was the case as they certainly have an ample amount of 1
37. 2 volt DC relay You will see the following type relays used FRL263 DO12 04CS as well as Guardian Type 1315H 4PDT 5 AMP Contacts Many sources are available for this type realy even Radio Shack carries a similar 4PDT relay See Specification sheet R12 17D3 12 or OMRON MY4 DC12 The large chassis relays RLO1 and RLO2 are infrequently a problem They switch your 8 12 and 15 volt lines as well as the AGC signal Take them out and clean them by hand with a small relay burnishing tool Put the tool between the contacts and operate the switch or relay by hand to provide pressure on the contact while you move the burnishing tool in and out like a file The burnishing tool has a very very fine abrasive on it so it only removes oxidation not the metal Then clean the contacts with Deoxit If you do not feel like cleaning the contacts then you can look for this relay using the following for reference NTE R12 17D3 12 Relay 4PDT contacts rated at 5A 240VAC coil vol tage is 12VDC Terminals suitable for socket NTER95 117 Equiv To Potter Brumfield KHU 17D12 12 amp others like the Guardian 1314H and the Tyco PB KHU 17D12 12 4 1393123 7 Main Chassis Relays RL1 amp RL2 FRL263 DO12 04CS or Guardian Type 1315H 4PDT 5 AMP Contacts Size just over 1 cubic inch This manual is a courtesy to you from Fox Tango International with contributions 14 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers KHU 17D12 1
38. 2 volt power to run the relays If you would like to see what it is we are talking about here download and print out the following PDF for your files See RF Unit 12volt Vs 24volt relay modification RLO4 and RLO5 From Harry Leeming G3LLL 3A Wilson Grove Heysham Morecambe LA3 2PQ 0790 1932763 U K The practical thing is that swapping relays on the RF board is hard work and if you are going to exchange one it is as well to swap the lot The only other relay that gives a little trouble is the Ant change over but swapping this is a separate job it does not usually fail at the same time as those on the RF board Life of relays on RF board is 3 5 years in a clean shack less than 1 year with a heavy smoker This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 15 Relay Unit PB 2345 RLO1 antenna 12 Vdc T R relay G2U 112P US t E ie http www foxtango org Original RLO1 on Relay Unit Omron G2U 112P 10V G5LE 14 Automotive relay available in USA OMRON G8SN IC7 CUK Automotive relay Europe only not available in USA Board Qty Relay unit PB 2345 1 FT 102 Main Chassis RL1 amp RL2 Guardian Type 1315 H 4PDT 5 AMP Contacts Outline Dimensions Mounting Code 1 KHAU only 2 amp 4 Pole 25 6 4 3 48 THREAD E T 168 00 0 L 4 27 00 25 de 265 00 8 3
39. 5 5 max 10 5 max 15 10 mm L odds http www foxtango org Fig A OEG OUA SS 112D OEG OUA SS 124D FBR211A D012 M Omron G2E 184P M Omron G2E 134P M Omron G2E 187M Board Oty RF Unit PB 2342 4 IF Unit PB 2343 1 Local Unit PB 2345 1 Final Board PB 2355 1 omron G2 Miniature Low cost Single pole PCB Relay E Miniature 15 5 x 10 5 x 11 5 mm Lx Wx HJ WB Low power consumption 200 mW crossbar contacts 810163128 W Gold clad contacts W Fully sealed type available E ideal for telecommunicatons equipment and security systems RC Ordering Information Contaat Genaral purpass 51 51 3 crossbar aGzZE 134P M 3 GlE 134P M Ua Hobe When ordering add the rated coll valise to the roca number Example G2E 18 F M U3 12 VOG coll valisgs 3 52 Model Number Legend ae OI OO O O O O voe 5 6 7 12334 g 1 Conta Form 4 Terminale 8 67 1 BFOT F Biralghi Pos M Gemerakourpose z Conta Typa E Power Consumption 7 Approved Standards 3 210 3181 crossbar Nons 452 mw US UL CAA 0 amp Hinge cresia H High sensitivity 200 mW B T E Voltage 5 3 5 3 Emctocure Ratings 9 12 22 OC uly sealed This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos 855 6 Wim PAOPGA and many other FT 102 lovers 11
40. 5 on your S meter such as on 80 meters that noise will be adjusted by the ALC to the same intensity at the speaker as the signal you are listening to It will therefore make copy more difficult Noise Blanker When using the noise blanker with very strong signals nearby or even on a strong station that you are listening to severe distortion products may be heard In this instance just turn the level control down and the signal will clear up A good zone should be obtainable where there is effective reduction of the pulse noise and a good clean copy on your signal of interest Sometimes I am listening to a very weak station and have the noise blanker turned way up and another station that is strong breaks in Distortion will be heard so always check to see if the control is engaged and how high the level is set Tune up I have included instructions for proper tune up of the radio Most important here is the rule of ten on and ten off This means that the maximum continuous key down time at full output should not exceed ten seconds And even more important is that in addition you must wait ten to fifteen seconds between key downs Modified board Normal Board I hope you can see the cause for my concern that this is on the web There is one other alternative to the RLO2 Problem and that is using a small signal relay made by Teledyne corporation This relay is enclosed in a metal can and looks like a transistor with eight lead
41. 5Y A the Local Unit after buffering at Q 3017 on the AF Unit portion of the speech signal is diverted for VOX operation The resulting audio signal from Q 2026 2SK19TMY is The remaining signal from Q 3002 is further amplified amplified by Q 2028 2SC380TMY which also amplifies by Q 3003 25C1815BL and passed through adjustable a sample of the audio input from the FM detector Q TX tone filters to tone amplifier Q 3004 2SC732TMGR 6008 delivered from the optional AM FM Unit when A portion of the output from Q 3004 is diverted to the the FM mode is used as well amplifies the output from optional AM FM Unit when installed while the remainder the monitor AM detector Q 2027 2SC380TMY which is applied to the balanced ring modulator composed of receives IF output from Q 2024 The output of amplifier Schottky diodes D 3002 to D 3005 15597 Q 2028 is delivered to the final audio amplifier Q 3025 The balanced modulator receives also a 455khz LO signal on the AF Unit for output to the speaker or headphones from the Local Unit after buffering by Q 3017 2SC1815Y and the resulting modulated IF is delivered to the IF unit VOX Anti Trip A portion of the amplified speech signal from Q 3002 is PB 2344 AF Unit amplified for VOX operation by Q 3010 2SC1815Y and Receive then rectified by D 3014 1N60 to produce a DC voltage The SSB or CW 455khz IF signal is detected at D3021 whose level varies with the speech input at the D3024 1
42. 9 and Segment driver Q 5008 both TC5066 pass the output of Q 5007 to fluoriscent display DS 5001 FIP9E8 while Q 5008 TC 5066 passes mode display information to DS 5001 The 8 volt DC bus is regulated by Q 5015 78L05 to provide the 5V supply for the IC s while the 8V bus is applied directly to the DC DC converter formed by oscillator Q 5014 2SC1815Y and T 5001 E142 Supplies negative 10 Volts DC for the display and for delivery from J 5006 to the 10 volt DC bus PB2349A RECTIFIER A UNIT Power transformer PTO1 delivers 120 190 and 250Vac for rectification on Rect A Unit The 120V input is rectfied by D 8006 10D10 and then filtered to provide grid biases for the driver and the final tubes VR 8001 adjusts the bias voltage for the finals and the biases are keyed as described in the CW Transmit Operation description The 190V input is rectified by D 8002 and D 8003 10D10 and then filtered after which a portion is pulled down to 180Vdc for the screen voltage to driver V 1001 on the RF Unit The remainder is passed through diodes D 8004 and D 8005 10D10 to provide 210Vdc for the screen grids of the final amplifiers The 250V is rectified by diode D 8001 SM1 12 and then filtered before delivery as 300Vdc to the plate of driver tube V 1001 on the RF Unit PB 2348 VFO UNIT Variable frequency Oscillator module Q 7001 VFO 1 provides an output of approx 4 95 to 5 55 Mhz in accordance with the setting of tuning var
43. AM TX and FM TX RX with optional module Receive 95 VA 73 VA with heaters off Transmit 440 VA for 100W output 368 x 129 x 309 mm 15 kg Better than 40dB at 14MHz Better than 60dB 14MHz 1 kHz tone Better than A0dB Better than 40dB 14MHz 100W PEP Approx 6dB at 14MHz Less than 300Hz drift during first 30 minutes after 10 minutes warm up Less than 100Hz every 30 minutes thereafter Low 200 to 600 Ohm 8 2MHz and 455kHz Better than 70dB from 1 8 to 21 5MHz Better than 50dB from 24 5 to 29 9MHz Better than 70dB 1 5 minimum 8 Ohm 10 THD 4 to 16 Ohm SSB CW AM 2 7 4 8kHz Width adjust continuously from 2 7kHz to 500Hz SSB nar CW wide 1 8 3 1 kHz XF 8 2HSN filter CW nar 600 1300 Hz XF 8 2HC filter CW nar 300 800 Hz XF 8 2HCN filter CW nar 500 1000 Hz XF 455C filter CW nar 270 600 Hz XF 455CN filter AM 6 12 4 kHz XF 8 2GA filter Better than 40dB SSB no optional filters RF AMP ON CW no optional filters RF AMP ON AM no optional filters RF AMP ON FM for 20dB quieting RF AMP ON CW with APF ON RF AMP ON SSB with XF 8 2HSN RF AMP ON CW with XF 8 2HSN RF AMP ON With no optional filters RF AMP ON With XF 8 2HC filter RF AMP ON RF AMP OFF 1 0 RF AMP OFF 0 7 RF AMP OFF 4 0 RF AMP OFF 3 0 RF AMP OFF 0 2 RF AMP OFF 0 8 RF AMP OFF 0 5 RF AMP OFF 95dB RF AMP OFF 100dB Frequency coverage Operating modes Power requirements Dimensions Weight TRANSMI
44. F unit Here you have them looked from the component side of the RF unit n RL1001 and 1002 This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 44 mu um RL1002 replacement IIT You can now resolder the rotary switch and put the RF cover and AF units back Once done you can check the rig Most of the relay problems should be gone by now LOCAL UNIT RELAY The LOCAL unit is also accessible from the bottom side This unit has only one relay which serves to switch the CLARifier So when it fails you will get nice frequency jumpings in CLAR mode Not too fine FT 102 upside down Get out the 7 screws and unplug all the connectors BEWARE my unit have three soldered wires which are attached to the LOCAL unit I managed to change the relay without unsoldering them but you should be careful in order to keep them unbroken FINAL UNIT RELAY This unit is also accessible from the bottom side and has only one relay which seems to switch some PA tubes control voltages This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 45 In order to replace RL1002 as it is a non standard relay it is better to build an adapter based on an standard 16 pil DIL socket and then just re
45. IO WHEN USING LINEAR Many complaints about poor audio have been received when using a linear amplifier that were traced to RF entering the 102 through a connected phone patch Since most people don t use phone patches anymore the simple fix is just to remove it the demise of phone patching has all be resulted due to cellular phones and Email If you re so inclined to fix the problem properly a little effective filtering to prevent the entrance of RF through accessories should take care of the problem REMOVE CB MODIFICATIONS See Yaesu mod sheet and reverse all mods The CB modification allowed the 29 30Mhz range to cover 27 28Mhz and the counter also had to be modified to display CB frequencies so it will have to be re worked as well NO TX Check the series pass transistor in the 12v regulator circuit NO TX NO DRIVE R01 on RECT A UNIT Check driver valve after replacing this POOR NEUTRALIZATION This can sometimes be a problem if 2 or 3 different types of valves are used in the PA PA WON T NEUTRALIZE PA screen grid supply to a higher voltage on the rectifier unit causing this problem FREQUENCY SHIFTS WHEN CLARIFIER ON Dirty contact on RL4001 the clarifier relay FM TX WAY OFF FREQUENCY Failure of Q13 TC5081P on AM FM unit See Yaesu mod sheet to prevent further failure LUMPY VFO DRIVE Improved can be had by cleaning and re lubrication of the the tuning mechanism If its really bad the drive will prob
46. N60 which also receives the 455khz third LO microphone This DC is amplified at Q 3011 2SC1815Y Signal from the Local Unit after buffering at Q 3018 and further amplified at Q 3012 2SC1815Y before being 2SC1815Y apllied to switch Q 3009 2SA733 Te switched output The CW audio product is then passed through an active of Q 3009 then controls a Schmitt trigger composed of CW filter Q 3020 2SC1815GR and APF filter Q 3024 Q 3013 and Q 3014 2SC1815Y which in turn switches AN6551 while the SSB audio product and the detected relay control Q 3015 2SA496Y to drive T R relays RL1 AM are passed through active filter Q 3022 2SC1815GR and RL2 on the main chassis and amplifier Q 3023 2SC1815GR after which each The anti trip signal is derived from a sample of the output signal is applied to analog switch Q 3019 MC14066B from audio amplifier Q 3025 or from an external source which selects the appropriate mode via the MODE via the A TRIP IN jack on the rear panel selector for further amplification Finally the selected This signal is amplified by Q 3006 2SC1815Y and then output is fed through the muting switch Q 3030 rectified by D 3011 to produce a DC voltage whose level 2SC1815Y to the audio power amplifier Q 3025 varies with the audio output from the receiver This DC is uPC2002V and from there to the speaker A portion of amplified by Q 3007 2SC1815Y and Q 3008 2SA733 the output signal from Q 3019 is diverted through before be
47. PA should be tuned to work Here you have a brief guide and it was just a 20 minutes job to do this I have extracted this information from the User s Manual and has worked for me all right I keep a IF UNIT RELAY copy of this information just below the rig for fast access Put the rig in its standard position so you can access when I switch from another transmitter not all are the to the upper side same The IF unit has only one relay This unit is the one Select defaul values for the controls which holds all the standard and optional filters The o MODE TUNE relay is located side by side to the 455kc filters near o LOADING 0 the back of the rig hidden below a bunch of wires o BAND desired band o PLATE pre select depending on band o DRIVE 0 Connect POWER and HEATER and wait 1 minute Turn the RF AMP ON and find a peak in background noise with PRESELECT 5 ETD d Activate PTT momentarily Ic should be 75 to 80mA gt Press PTT Set DRIVE to about 9 o clock position NO KEES Adjust PRESELECT for a peak reading YAESU MUSEN CO LTD The following steps should be maximum 5 seconds each O Activate PTT Find an Ic DIP with PLATE control Go back to reception o Press the PTT Get an ALC indication of 9 with the DRIVE control Return to reception o Put LOADING to 1 Press PTT IF unit relay Get an Ic DIP with PLATE If it fails you will
48. TTER Carrier suppression Sideband suppression Spurious radiation Third order IMD Negative feedback level Frequency stability Microphone input impedance RECEIVER IF frequencies Image rejection IF rejection AF output AF output impedance Selectivity 6dB 60dB Options IF notch depth Sensitivity worst case in uV for 10dB S N N except FM Dynamic range RF AMP ON RF AMP OFF 102dB with IF WIDTH control at maximum With XF 8 2HCN filter This manual is a courtesy to you from Fox Tango International with contributions 42 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers For replacement I used OMRON relays All the FT 102 relays have an OMRON equivalent sealed and with bet ter electrical characteristics than original ones EXCEPT for one relay which had a very curious and exclusive pinout shown in a picture later So curious that the only way to replace it is making an adaptor with an IC socket and some rewiring in the PCB By the way Fujitsu the original manufacturer of the FT 102 relays still manufactures some of them but I won t buy again the non sealed relays and will get the OMRON or Fujitsu sealed types Price difference is really low and sealed relays will last lots more For your reference a complete OMRON relay set was about 45 back in 2000 now some of the relays are obsolete types here in Valencia Slight differences in nomenclature of the relays as G2E
49. Wim PAOPGA and many other FT 102 lovers 9 the FT One the flagship of the line The FT 102 is a selfcontained transceiver including the powersupply a PA with a lot of punch and a very sensitive receiver The looks resembles somewhat the look of the high end audio equipment of the time black and silver but very stylish done it remains a beautiful piece of equipment even after some 25 years The receiver of the FT 102 has a excellent sensitivity and can handle very big signals distortion free due the special developed RF and Mixer stages The dynamic range is about 135db measured in several tests a unique feat for an off the shelf transceiver of this age Even the newest transceivers in the 10 kilobuck range can not surpass this The receiver uses a dual IF stage with excellent filtering with even 3 cascaded filters possible so the selectivity can really be awesome Using a special mixing technique it is possible to vary the bandwidth of the IF continuously and place the filter at any place in the main passband for eleminating low or high pitched noise cutting down the QRM as much as possible the best you could get in the pre DSP days The IF has 2 stages 8 2 Mhz and 455khz which allows for a beautifully recovered audio in fact the 1 102 has the best audio I ever heard The TX side is just as impressive with a very beautiful audio quality It allows adjustments to make the most from your voice and the used micr
50. YAESU HF transceiver This manual is a courtesy to you from With contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Unique recessible controls for VOX GAIN DELAY MIC GAIN processor COMP NB LEVEL and FM SQL are normally flush with the front panel Just touch the knob and it pops out for adjustment and press it back in out of the way when set The NB LEVEL control actually adjusts the width of the noise blanking pulse giving incredible versatility to remove a wide variety of noise The NAR button conveniently selects the optional narrow filters for the mode SSB or CW selected by the MODE selector The RF AMP button can be pressed when band noise is high or strong signals are being worked bypassing the RF amplifier and pushing the dynamic range over 100dB Press the MONI button to monitor the IF of the transmitter when tuning up or adjusting microphone audio re sponse You can precisely adjust the RF processor while listening to the actual processor output While speaking into the microphone press a button to activate the ALC Peak Hold system causing the ALC meter needle to stop right at peak ALC auto matically and allowing truly accurate transmit level setting Dual meters allow much more all round H2 Sia eae AL operating convenience and become II oos indispensible for truly precise adjust SABE sillier ment and monitoring of the RF spe
51. ably need to be replaced KEY CLICKS Some of the earlier models suffered from key clicks on CW To cure this connect a 0 68 microfarad cap between key 1 on the REC A board and earth DRIFT ON CW Some of the early units suffered from a drift of 50 100Hz during the first couple of minutes of CW transmission Yaesu suggest removing C153 3 3 microfarad on the local unit to cure this problem It is located between X4002 and T4014 RF AMP NOT WORKING If your RF amplifier is inoperative turn the volume all the way down on your transceiver push the RF Amp button thus checking the Relay and control circuit You should be able to hear the RF Amp relay click on and off with the button If after checking the relay your amp is not working it can be assumed re amp transistors Q01 and Q02 on the RF Unit FETS on the RF unit 2SK125 could very well be bad Data sheet for Sony 2SK125 This was a common failure item on the FT 102 HTML page 2SK125 data sheet below LOW RX SENSITIVITY Check antenna input lamp fuse which is a small lamp fuse located on the relay unit in the PA compartment It is not possible to use any old bulb here as some bulbs may cause several dB attenuation Recommend replacing the lamp fuse with original equipment INTERMITTENT LOW RX SENSITIVITY Suspect the relays on the RF pcb around the RF amp Don t miss RLO4 this is the relay at the front of the board under the shaft of the band switch which is difficult to change Cle
52. age on one meter along with metering of plate voltage cathode current relative power output or clipping level on the other This system greatly simplifies proper adjustment of the transmitter Microphone Amplifier Tone Control Recognizing the differences in voice characteristics of Amateur operators Yaesu s engineers have incorporated an ingenious microphone amplifier tone control circuit which allows you to tailor the treble and bass response of the FT 102 transmitter for best fidelity on your speech pattern RF Speech Processor The built in RF Speech Processor uses true RF clipping for improved talk power under difficult conditions The clipping type speech processor provides cleaner more effective punch for your signal than simpler circuits used in other transmitters VOX with Front Panel Controls The FT 102 standard package includes VOX for hands free operation Both the VOX Gain and VOX Delay controls are located on the front panel for maximum operator convenience IF Monitor Circuit For easy adjustment of the RF Speech Processor or for recording both sides of a conversation an IF monitor circuit is provided in the transmiter section When the optional AM FM unit is installed the IF monitor may be used for proper setting of the FM deviation and AM mic gain WARC Bands Factory Installed The FT 102 is factory equipped for operation on ali present and proposed Amateur bands so you won t have to worry about retrofitting capabil
53. and is not involved in the modification I used a radial lead 10uF capacitor both leads come out the same end The voltage limitation is not very important because it is in a low voltage circuit As can be seen in this photo the leads are bent 90 degrees in opposite directions so that the cap looks like a ballerina doing a split The fourth photo shows that the leads are bent again at 90 degrees so that they face in the same direction and are parallel and 1 2 inch apart This will match up with the terminals of the control The leads are also trimmed to about 72 inch again see photo 4 The stripe on the capacitor indicates the negative terminal and so you solder this to the left lead as indicated in the photo The positive lead is soldered to the right post and that is it When you bend the leads note where the negative stripe is and the orientation of how you will place the cap into position If you have done the second bend in the wrong direction just rebend the leads It should look like the final photo Hams are by nature resourceful and industrious so that if you have an axial lead capacitor at hand one lead comes out of each end of the cap just apply your intelligence and skill to complete the job Now button up the radio and note the increased responsiveness of the meter If you want more movement you guessed it use a larger capacitor but it should be an electrolytic and polarized That s it folks Have
54. and many other FT 102 lovers 29 Yaesu 102 Factoids by Malcolm NCAL see his webpage at www members aol com NC4LMal The FT 102 was designed by the same fellow who later designed the receiver for the 1000D The receivers are basically identical until the last IF where the 1000D incorporates the DSP functions In fact the 8 MHz IF frequencies are identical and both radios incorporate variable IF Shift Width and Notch filters in the same way All three of those controls are only found in the flagship radio of each manufacturer since they are costly to install in the IF chain IF filtering is superior to DSP filtering since IF filtering affects the AGC loop and DSP filtering is usually only in the post detection audio loop This means that notching a carrier in the SSB mode by a DSP mechanism still leaves the effects of that carrier in the IF circuitry and consequently that signal s interfering effect on AGC functioning With IF filtering the signal is removed from the IF stage and therefore its effects on the characteristics of the IF and AGC circuitry are also eliminated Are you aware that if you have an auto notch DSP EE s EE filter you cannot use it in CW because it will track the Soio se ie loudest tone On the other hand IF notch filtering is JER HEATER vox GAIN DELAY MIC GAIN COMP NB LEVEL good in any mode r D Cy Q i The third order intercept in the 102 as measured by QST labs in 1984 was 19
55. aning the relays can help but they usually go intermittent again within a few weeks it s better to replace them if they are available PRESELECTOR NOT TUNING CORRECTLY There is a shaft coupler on the band switch shaft if the screws in this are loose it is possible for the front and rear sections of this switch to be out of physical alignment NO RF OUTPUT PA DRAWING CURRENT AS NORMAL The main antenna T R relayhas been known to burn its contacts PA FAULT CONDITIONS Rig blowing fuses Check for physical short circuits around the band switch in the PA compartment Inspect the rear panel fuse socket and see if the slot for a screw driver is worn down If so this is a good indication that the rig has been blowing fuses thus you possibly have one or more 6146 final amplifier tubes that are failing or arcing occasionally ERRATIC CONDITION WHEN LOADING CONTROL IS VARIED especially below setting of 2 on panel marking Varies smoothly when top of final amplifier compartment is removed Trouble returns when PA top cover replaced The loading capacitor frame touches the top cover of compartment Insulate top cover around loading control oneliner If all else fails read the destructions This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 19 This manual is a courtesy to you from Fox Tango International with
56. audio frequency response 300 2900 Hz 6 dB adjustable Third order intermodulation products Better than 40 dB 14 MHz 100W PEP Negative feedback level Approx 8 dB at 14 MHz Frequency stability Less than 300 Hz drift during the first 30 minutes after 10 minutes warm up less than 100 Hz every 30 minutes thereafter Modulation types A3J J3E balanced modulator A3 A3E low level amplitude modulator 3 3 variable reactance modulator Microphone input impedance Low 200 to 600 ohms RECEIVER Image rejection Better than 70dB from 1 8 21 5MHz Better than 50dB from 24 5 29 9MHz IF rejection Better than 70 dB AF Output 1 5 W minimum 8 ohms 10 THD AF Output impedance 4 16 ohms Selectivity 6 dB 60 dB 558 CW AM 2 7 4 8 kHz with no optional filters Width adjusts continuously from 2 7 kHz to 500 Hz 6 dB Specifications are subject to change without notice due to design changes feedlines Contained within the diecast weatherproof housing of the FAS 1 4R are four independent relays to ensure low loss and excellent isolation SP 102 External Speaker Audio Filter The SP 102 features a large 120 mm high fidelity speaker with selectable low and high cut audio filters allowing twelve pos sible response curves Headphones may also be connected to the SP 102 to take ad vantage of the filtering feature which allows audio tailoring for each bandwidth and m
57. be it a radio a car or a motorcycle and that 1s just a part of the fun Parts are easely available or can be substituted Internet is really a great source because you can shop all over the world I have purchased parts from all over the world with no problems whatever It is just as easy to buy in Australia or elsewere as it 1s locally The time that there was a electronic shop in every town is really gone but if you search the Internet you find some very good sources for obsolete parts And if you need help Members of the FoxTango group are always there to help you out in trouble or if you are confused by some unexpected issue Try them they are really a great bunch For all facts and knowledge put in this Survival Guide we will thank the original authors for letting us use their material They are Hams with the right spirit and have much expertise So follow their tips and keep your FT 102 in the air We will try to update this manual from time to time if we have collected new material so if you like to contibute to this Survival Guide send your material to Carol W4CLM or to Wim Penders PAOPGA wpenders remove home nl for including in the next update Thanks in advance I hope you will enjoy the next pages and maybe you will be a wiser wo man when finished 73 Wim Penders PAOPGA This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV
58. bes with 6146B types often results in spurious emissions parasitic oscillations etc This is due to the fact that there are different bias requirements different inter electrode capacitances etc of the 6146B ver sus the other two It is often difficult to neutralize 6146B tu bes when used in place of the 6146 6146A If neutralization can be achieved often it lasts for just a few minutes before the tube s goes into oscillation If one insists on trying the 6146B tubes in place of the 6146 6146A types the very first thing to do is to neutralize the final amplifier If it will not neutralize then the 6146B tubes should immediately be replaced with the older type tubes If it does neutralize then the neutralization should be watched for several hours even days of operation If the neutralization changes then the 6146B tubes again should be replaced with the 6146 6146A series If the neutralization remains con stant after several days then use of the 6146B is fine in that particular transmitter I have in my shack a number of transmitters that use the 6146 6146A type of tubes These include Collins 32S 1 32S 3 earlier model before the neutralization was changed Heath Apache DX 100 DX 35 SB 401 SB 110 Seneca Johnson Pacemaker and other transmitters as well Every one of these This manual is a courtesy to you from Fox Tango International with contributions 48 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA
59. bright and shiny Now comes the hard part The copper arms holding the contacts which have been splayed back have to be gently returned to their original position and tensioned for proper force I do this by hand and it is a very time consuming and exacting endeavor When this is completed the unit goes for its first gold plating For half of the gold plating session the arms are held in the open position to get those contacts plated Then the special plastic shim holding the contact open is removed and the unit is plated again to get the other two contacts RF Unit RLO2 Relay The unit is again rinsed and dried before the conditioning process is started This is done by repeatedly cycling the contacts with a high current flowing to all the contacts I found that this is necessary to This manual is a courtesy to you from Fox Tango International with contributions 12 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Another relay of interest in the FT 102 is RLO1 on the final board PB 2355 See Photo to the left of the PA board RLO1 should drop the PA screen voltage from 210v to 180v when the transceiver is switched to the 10 meter band The circuit on the final unit can be seen on page 63 of the FT 102 technical supplement in the lower right hand corner see L07 R06 Q01 transistor switch 2Sc1815 which then goes to the coil of RLO1 ironically none of the parts listed he
60. cal Unit which works on the CLAR circuit it it fails frequency will jump from some Hz to full kHz So any sign of these troubles is indication of a relay failure Cleaning the relays is just a temporary solution which does not last long so I recommend changing all the relays same time I have done it myself in the first FT 102 unit I had and it was a four hours work I have also done my second unit with excellent results FT 102 Relay Substitution Table Board or Reference Original relay RF Unit PB 2342 RLO1 RLO3 FBR211A DO12 M RLO2 FBR221A DO12 RLO4 RLOS FBR211A DO24 M IF Unit PB 2343 RLO1 FBR211A DO12 M Local Unit PB 2345 RLO1 FBR211A DO12 M Final Board PB 2355 RLO1 FBR211A DO12 M Relay Unit PB 2354 RLO1 OMRON G2U 112P 10V G8SN 1C7 CUK 12 MOST OF THESE RELAYS ARE NOW OBSOLETE BUT SOME CAN STILL BE BOUGHT AT RS COMPONENTS FT 102 in the workbench This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos 855 6 Wim PAOPGA and many other FT 102 lovers 43 TUTORIAL These are the compiled notes and pictures I took in my last FT 102 repair I got this nice unit still fitted with the original relays As expected unit had the well known troubles with them so I got a new batch of OMRON relays and saved them for future use Finally I was able to accomplish the task All the work done very carefully was about four hours It can be done
61. contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers FT 102 RF board schematic diagram 20 9310N 39 8380 0 SS31Nn S3IBUN3H NI IXY SINIYA YOLONGNI ONY Mb E CE C E Cc EE SM v LUU NI 387 SINIYA YOLSISSY HAMOG JN NI 387 SINIYA NOLIO Vd VO 310N oaz oto v2o O oosz 0 MS 0 012O O xnv g iS 0960 gt N 831V3H OtiQ M na 61 9 OQ 0 eT 5 2 oom O st Oxo f 04 3 Som D OND 2 21 N AES 8 Tg P NI X1 zzu Oi 1 N 9 8L204 81514 Gr Lo TT 1 0 iu ial ior eT RO u C To LOT Ld 22280 B ee sf ne e1 jb efe ee t SiT deg 3 5218 a a Is 5 ol 2 NI O1 isi O 2 u Legs 0 m 2a zor a S e4 N ds N i Olg N die E aan EE 621 08 ieu iLp 8 olo c k ma e s E oc TE 3 Qc 600 F2 lt ONO es OIO OT iosa 231 E v2 xau 2 o73 o X day a o O AOCOE a sor 6 oe Q A39 OTs on 3 3 2 a 9810982 v00 p 25 g e 27i lt lt I x2 3 6 0 0 a ASIBIOSZ 8 o 9 8 dia 00 7 IOO bb a Gee T 4 d 3 B o igus 7 i 2 2 Oo d o Y o Y O21 ttd et o Il Q Q 9 zoly Qi o AMOOG 2 mpm
62. dards in both freedom from distortion and purity of emissions Transmitter Audio Tailoring The microphone amplifier circuit incorpo rates a tunable audio network which can be adjusted by the operator to tailor the trans mitter response to his individual voice char acteristic before the signal is applied to the superb internal RF speech processor VWwuwiewnunnnumh ad A A A die IF Filter Configurations with options NOTCH Characteristic Fc 455kHz Vert 5dB DIV Hori 2kHz DIV New Noise Blanker The new noise blanker design in the FT 102 enables front panel control of the blanking pulse width substantially increas ing the number of types of noise interfer ence that can be blanked and vastly im proving the utility of the noise blanker for all types of operation including woopecker blanking This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers LIII 2 1 SE META RANGE 209 weet ETA HOD 19 ANIB AS d EL ANTENNA TUNER FC 102 when a scanning microphone is used Up to twelve frequencies can be memorized by the FV 102DM entered from the FT 102 FV 102DM VFO or from the front panel numerical keyboard Additional front panel controls include plus and minus 5 kHz and plus and minus 20 kHz stepping buttons VFO dial lock last digit blanking
63. e same The key lead from the key jack activates sidetone oscillator Q 3005 on the AF Unit and also controls switches Q 8001 2SA639Q Q 8002 2SC1815Y and Q 8003 2SA639Q to turn the biases to the final tubes on and off Q 8002 also keys post TX mixer amplifier Q 3026 and offers a keyed control point at pin 2 of the ACC 1 jack The sidetone oscillator provides an output to VOX amplifier Q 3010 to activate the VOX circuit for semi break in CW control PB 2347 Optional AM FM Unit FM Receive A portion of the buffered IF signal after the 20khz filter XF 1001 from Q 1004 is delivered through another 20khz width filter XF 6001 on the AM FM Unit to the mixer section of Q 6008 MC3359 which also contains limiter amplifier discriminator noise amplifier and AFC sections In the mixer section the filtered receiver IF is mixed with the 8 67 Mhz second LO signal delivered from the Local Unit resulting in a 455khz second IF This signal is passed through ceramic filter CF 6001 and fed to the IF limiter amplifier section of Q 6008 where amplitude variations are removed from the signal The signal is then applied to the discriminator section of Q 6008 resulting in an audio output coinciding with frequency shift in the 455khz IF signal When no carrier is present in the 455khz IF the high frequency noise present at the discriminator output is amplified by the noise amplifier section of Q 6008 and rectified by noise detector D 6004 1N60 T
64. ech PE ree processor i I Ru E An IF Notch system and a Audio Peak v YAESU HF ALL Filter are selected and tuned inde er 7 2 E TN e I t a pendently Both can be used at the Lg ES v same time if desired IEEE SAN 3 ii Friction ganged IF Shift Width controls Ee W E allow the operator to select the opti 2 mum bandwidth for band conditions and mode and then to tune this SIC window across the incoming signal IR LJ Say goodbye to ORM Novel chassis design and rugged cabinet constructed so that the FT 102 is more compact than any other transceiver power supply combination in its class only 310 mm deep This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers DYNAMIC RANGE TRANSMITTER OUTPUT en AUI UA UV SUI I 00 0 ne James IRANIANS MEDA OD PDN AS ee e e o LOADING S E EAE ES MODE TRANSCEIVER FT 102 3 nanan Scania NND DELAY MIC GAIN COMP NB LEVEL SQL h AGC METER SELECT BAND ees PRESELECT m uam 9 ua t t ug t 8 ur LLI tC 18 5 AF 75 p m e es p s 5 7 4 50 Zr 1 HV i 14 t 05 t I
65. ent audio peak filter can also be ac tivated for single signal CW reception NORMAL PASSBAND t OPTIMIZED PASSBAND BE aT A UNWANTED SIGNALS rn DESIRED SIGNAL m ri 11 d This manual is a courtesy to you from Fox Tango International with contributions Better Dynamic Range The extra high level receiver front end uses 24 VDC for both RF amplifier and mixer circuits allowing an extremely wide dyna mic range for solid copy of the weak signals even in the weekend crowds For ultra clear copy on strong signals or noisy bands the high voltage JFET RF amplifier can be simply bypassed via a front panel switch boosting dynamic range beyond 100 dB A PLL system using six narrow band VCOs provides exceptionally clean local signals on all bands for both transmit and receive TYPICAL DYNAMIC RANGE RF AMP ON if btercezt Pani 4 p Fma 14MHz A j Signal Spacng 50 Hz IF Bandwidth 500 D f Fiver 1 Denn fAasge 10108 99 3810n input Level TYPICAL DYNAMIC RANGE RF AMP OFF sf inarrosi Poet 1 Fmao 14MHz oe f KONEI Signal Spsona 50 kh j IF Bandwidth 500 7 i Deed Simul 12638 100 Input Level t W gt T T 1 Z lt t I W T Z lt e t 0 i t uj I T I LL from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Lb a PMAR ana ee
66. eplacing them all If you need a set See the Fox Tango Club Candy Store for our FT 102 Relay Replacement Pack Also see Installing New Relays In Your FT 102 In an effort to clear up any misunderstanding about the FT 102 and the relays we will take a look at each individual relay its replacement and or modifications for replacements The relay that is most commonly seen relay in the FT 102 RF Unit PB 2342 is RLO1 RLO3 RLO4 RLOS if your transceiver has the original small blue cube relays as shown in the photo above these were made OEG Relays TYCO Electronics the more commonly used replacement part for these relays is the OMRON G2E 184P The relay is a miniature low cost single pole 12 VDC relay Pretty straight forward in that it is wired for normally open N O or normally closed N C contact You should make note of the following so FT 102 were modified so that RLO4 and RLO5 are wired for 24vdc see notes below for more on this Omron G2E 184P M See Omron G2E data sheet here If Yaesu USA has any left the part number as of 1 12 06 was M1190032 at a cost of 4 50 each when they were available from Yaesu parts but they no longer carry these in current stock See figure A to the left side As noted you will find four of these on the RF Unit PB 2342 one on the IF Unit one on the local unit and lastly one on the final board needs to be removed just under the 6146 tube sockets All can be replaced with the OMRON relay G2E 184P M fully
67. ers 0 18 0 7 AM no optional filters 1 0 4 0 FM for 20 dB quieting 0 4 3 0 CW with APF on 0 05 0 2 SSB with XF 8 2HSN filter installed 0 2 0 8 CW with XF 8 2HC filter installed 0 12 0 5 Dynamic range with Shift Width Control set for maximum IF width 14 MHz RF AMP ON RF AMP OFF With no optional filters 90 dB minimum 95 dB minimum With XF 8 2HC installed 95 dB minimum 100 dB minimum With XF 8 2HCN installed 97 dB minimum 102 dB minimum No reception at 10 33 MHz fi 91 one Optional AM FM Unit required for AM transmission and FM operation SPECIFICATIONS GENERAL Frequency coverage Band Range 1 8 1 8 2 0 MHz 3 5 3 5 4 0 MHz 7 7 0 7 5 MHz 10 10 0 10 5 MHz 14 14 0 14 5 MHz 18 18 0 18 5 MHz 21 21 0 21 5 MHz 24 5 24 5 25 0 MHz 28 29 28 0 29 9 MHz Operating Modes LSB USB A3J J3E CW A1 A1A AM A3 A3E and FM F3 FS3E Power requirements 100 117 200 or 234 VAC 50 60 Hz Power consumption Receive 95 VA 72 VA with heaters off Transmit 350 VA for 100W output Dimensions WHD 368 x 129 x 310 mm Weight Approx 15 kg TRANSMITTER Power Input 1 8 25 MHz 28 29 9 MHz SSB CW 240W DC 160W DC AM 80W DC 80W DC FM 160W DC Carrier suppression Better than 40 dB at 14 MHz Sideband suppression Better than 60 dB 14 MHz 1 kHz tone Spurious Radiation Better than 40 dB Transmitter
68. fun I hope to have more mods in the future 73 de NC4L Mal with contributions 10 UF CAPACITOR WITH LEADS BENT AND CUT _FINISHED MODIFICATION nar e Gt AGS This manual is a courtesy to you from from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 35 Enunciator Mod for AM Here is an easy modification for those 102 owners that have an AM filter installed Unless I have worked on your radio the enunciator located to the left of the digits in the display will say AM N when you switch to AM even if the AM filter is installed Yaesu apparently forgot to put the switching network and circuitry into the radio to change the letters to AM W or AM wide This modification should take you 10 minutes to do Take off only the upper case and place it aside Locate the display board in the middle front of the radio It is not necessary to remove the board from the radio but have it turned off As the radio faces you find diode 14 on the front left of the display board see photos The marking will be directly in back of diode 14 This diode is mounted in a semiverticle position and you will be soldering the cathode of a second diode to the highest point on this D14 lead Then identify diode 06 which is the second diode to the right of D14 Cut its cathode lead as far to the front of the set as possible Then take D12 which is between 14 and 6 and bend it
69. g LET ME RECOMMEND ONE THING IF YOU PULL THE FRONT FORWARD TAKE SOME KIND OF A MARKER put the band switch straight up on 18 Mhz and mark the band switch before you pull the panel forward In case you have a brain fart and somehow the band switch moves you will know where it goes back together If you do it my way and pull the front panel forward a 1 4 to 1 2 inch BE DAMMED SURE YOU DO NOT LOOSE THE BLACK PLASTIC COUPLING FROM THE PART OF THE BAND SWITCH GOING TO THE MAIN SWITCH ON THE RF UNIT Put all screws and parts in a container and don t loose them when you work m ARA x R s yr p t a J 0 3 0 A our G e Gerais ed M onina MO e quM 22 v E d DL us 25 A WI a 3 x 2 c E This manual is a courtesy to you from 16 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers I talked to Malcom about this process for replacement of RLO5 Mal said NOT to pull the panel It s up to you Mal told me that he unsolders the two wafers from the RF Unit and lifts up on the band switch wafers about a 1 4 of an inch and puts the relay on double sided stick tape attached to a pen or something The he some how pushes it in This may work for him but it s tight getting in to the front of the rig there with the front panel so close and you risk bending a pin on the small relay if it does not fit into the holes e
70. get jumpings in the S meter indication Go back to receiving mode on receive and ALC on transmit but it will affect only to o Advance the LOADING control slightly and re the meter not to the real signals Anyway it is worth DIP with PLATE until the Ic DIP is exactly at changing it You will need to unplug all the connectors 300mA 350mA in 1 8MHz band in the IF unit a LOT of them really Be VERY careful The final LOADING position should be close to with the coaxial connectors Pull them from the metal the table shown in manual page 24 part NOT from the cable as it is delicate Write down the colors of the coaxial wires and its location a fast Please let me know if you have any doubt comment or sketch is just fine Once you have done that get out correction about the information shown in this page the 6 screws and carefully remove the IF unit Change the relay and put it back in reverse sequence Now your 73 Jose EBSAGV S meter will be fine again Well I hope these notes could lead to a full working FT 102 Please let me know if you have any doubt or comment about the information shown in this page This manual is a courtesy to you from Fox Tango International with contributions 46 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers The 6146 Family of Tubes Glen E Zook KOSTH Probably the most used tube of all times in the final amplifier of boat anchor transmitters is the 6146
71. gh the RF amplifier relay RL 1003 and T R relay RL 1004 to one of the bandpass filters selected by two sections of the bandswitch When the RF amplifier is switched off the signal is passed directly from RL 1001 to RL 1003 and to the bandpass filter bypassing the RF amplifier and giving a still better great signal handling From the bandpass filter the signal is fed through the T R relay RL 1005 and transformer T 1031 to the active balanced mixer Q 1005 and Q 1006 2SK125Y Here the signal is mixed with the first LO signal from the Local Unit The resulting 8 2 Mhz mixer product is then passed through transformer T 1030 and XF 1001 a monolithic crystal filter with a bandwith of 20 khz a kind of roofing filter to remove IMD causing products and transformer T 1029 to the IF Unit A sample of the wideband IF signal at T 1030 is buffered by Q 1003 2SC1815Y for external monitoring via the IF Out 2 jack A sample of the filtered IF signal at T 1029 is buffered by Q 1004 2SK125Y for delivery to the noise blanker circuit on the IF Unit and the FM receiver circuit in the optional AM FM unit The transistors Q 1001 through Q 1006 operate all from the 24Vdc supply used to obtain a very good large signal handling Transmitter The modulated and filtered 8 2Mhz IF signal is applied to the balanced mixer module Q 1008 ND487C2 schottky bridge along with the first LO signal from the Local Unit resulting in an output signal at the ope
72. have to be cut and rerouted This crosses sensitive RF lines and decreases the performance characteristics of the radio I am sure you know that the component and trace placements on the board are not a matter of happenstance but rather are placed in certain ways after much experimentation by the designer to improve cross talk and non wanted signal mixing The modification changes the benefits of the manufacturers design by moving the lines and crossing the lines When I measure blocking dynamic range of an unmodified ra dio I get 127 dBM at 20 KC spacing When I measure this on the modified radios I get 124 dBM which is a halving of the figure In addition it is a very hard modification for most hams to do The plastic socket has to be soldered and wired and the pins are on 1 10 inch distances If you use anything but a fine pencil iron and do not have ex pert proficiency at soldering and perhaps your vision isn t like a teenager you will make a mess of this modification In addition most hams use soldering irons that are too hot and lift the traces The mod does work but at an expense of performance But my real complaint about it is that he makes it look easy and a lot of guys will try it When they get into trouble they will be left with a cut board with lifted traces and will stop working on it out of frustration And presently this is probably the main reason that the 102 goes to the radio graveyard Check the photos oneli
73. he resulting DC voltage is passed through the SQL control back to Q 6008 which turns off the audio output when no carrier Is present When a signal is received the audio output from Q 6008 is delivered to audio amplifier Q 3025 on the AF Unit unless the MUTE line grouded in which case Q 6012 2SC1815GR grounds the output signal from Q 6008 AFC output from Q 6008 is filtered and delivered through the METER I for discriminator tuning indication FM transmit The signal from tone amplifier Q 3004 on the AF Unit is also delivered to limiter amplifier Q 6014 uPC577H on the AM FM Unit where the audio signal amplitude is amplified and limited to a preset level preventing over deviation This signal is then applied to varactor diode pair D 6003 MV104 to phase modulate 8 2 Mhz VCO voltage controlled oscillator Q 6006 2SK19BL serving as part of a PLL Phase Locked Loop One portion of the VCO output is buffered by Q 6004 2SK19TMGR and then divided by 256 at Q 6005 TC5082P for application to phase detector Q 6013 TC5081P This manual is a courtesy to you from Fox Tango International with contributions 24 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers The 8 67 Mhz second LO signal is derived from the 19 215 Mhz VCXO and the signal from another 10 54 Mhz VCXO actually 10 5466 for USB 10 5434 for LSB and 10 545 Mhz for AM with continuous frequency adjustment by the Width system The output of
74. iable capacitor VC 7001 paralleled with temperature compensating capacitors and trimmers and Clarifier varactor D 7001 192236 whose capacitance is varied by changes in the clarifier control adjusted from the CLAR control when the CLAR function is activated on either transmit or receive Output from Q 7001 is fed through a bandpass filter before delivery from pin 1 of J 7001 to the local unit PB2346A COUNTER UNIT The 0 5 to 1 0 Mhz sample signal from the Local Unit is buffered by Q 5001 2SC1815Y and again by a gate in Q 5005 MC14011B before being applied to Q 5006 MC14022B for gating and division by 8 Output from Q 5006 is then applied to pin 37 of LSI Counter Q 5007 TC 5070 The 25 khz clock signal from the Local Unit is buffered by Q 5002 2SC1815Y and divided by 25 and by 50 at Q 5003 MC14518B The resulting 1 Khz output is applied to SCAN LOCK pin 22 of Q 5007 while the 500 hz output is passed to Q 5004 MC14518B for further division by 10 and by 50 These outputs are summed in Q 5005 resulting in a gating pilse for Q 5006 and LOAD PRESET input to pin 32 of Q 5007 The 10 hz output from Q 5004 is also delivered through a gate in Q 5005 to provide a STORE pulse to pin 16 of Q 5007 and to Q 5006 for gating control This manual is a courtesy to you from 26 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers is regulated by Q 8503 2SC496Y and zener diode D 8501 AW01 24 to prov
75. ication by Bill W3DUQ previously posted here If you have a mod dated prior to 7 December 2004 please read the following and take the appropriate actions either do the mods below or do not use your FT 102 on FM see number 2 below TNX WB3HUZ A Fix for the Previous Modification The previous modification had two very serious drawbacks 1 The radio and board are neither forward or back compatible By that I mean that the modified board could not be used in another unmodified 102 and that a modified radio could not accept a normal unmodified AM FM board 2 Because AM is also powered up when FM is selected both forms of modulation mix and the output on FM is very distorted by the simultaneous AM modulation components The Key Down Surge Problem The FT 102 has a serious surge or overshoot of power when first keyed in the AM mode If you are driving a linear the surge may cause damage to the amp s tubes or transistors or cause protection circuitry in the amp to shut it down Further even if your amp survives it is likely to be overloaded for a brief period and the first few words of your transmission will be distorted and cause splatter due to flattopping Actually this will occur even if you use the 102 barefoot although the splatter will be less noticable due to the lower power But good amatuer practice is to avoid splatter no matter the power level Let s look at the severity of the problem When I look at the
76. ide 24 Vdc for the receiver frontend circuits on the RF and IF Units A portion of the 24 Vdc is further regulated by Q 8505 78L15 to provide 15Vdc for the Width Control system During transmission 12Vdc is applied to Q 8504 2SC1815Y which then grounds the base of Q 8503 dropping the 24Vdc and 15Vdc lines to zero and thus disabling the sensitive receiver front end and the Shift Width function The power transformer 320Vac winding connects to the Rectifier B Unit where the AC is rectified by D 8501 through D 8504 10D10 and then doubled by capacitors C5 and C6 on the main chassis to result in 900 Vdc for the plate circuit of the final amplifiers Also when a plug is not inserted into the EXT VFO jack on the rear panel 8 Vdc is delivered from the 8 Vdc supply bus regulated from the 12 Vdc bus by Q2 uPC14308 on the main chassis to zener diode D85 6 producing 6Vdc for delivery to the VFO unit ALC circuit On RECT A Unit the grid bias to the final power amplifiers is sampled by Q 8004 2SC2229 A resulting DC voltage appears whenever the grids of the final tubes are driven positive with respect to the bias voltage as grid current starts to flow through R8021 causing a voltage drop that is then amplified by Q 8004 for delivery to the IF Unit On the IF Unit a portion of this ALC voltage is fed to the gate of second IF amplifier Q 2003 varying the gain of this stage to limit the drive level to the RF Unit and final amplifier
77. inal manufactured by Yaesu you won t find a relay like this I m not sure what the Yaesu engineers had in their heads other then sushi and Sake rice wine on the day they all got together and designed this gem called the FT 102 But if we take a quick look at other transmitters using 6146 finals you will see the screen voltage is usually well above the 210 used on all bands in the FT 102 screen Pin 3 Make Rx gt Down Yaesu FT 101ZD 220v 180v Yaesu FT 901 902 264v 245v Kenwood TS 820 255v 210v Heathkit HW 101 300v 295v This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos 855 06 Wim PAOPGA and many other FT 102 lovers 13 reform the contacts since no matter how carefully I reposition and tension the arms the fit may not be perfect This high current during the make and break cycle heats the metal of the contact and deforms it so that it fits precisely to the matching opposite half Too few cycles will not give a good fit and too many will permanently damage the contacts This information is proprietary so we will go on to the next step The unit is now replated for all four contacts in the gold solution bath so that the previously heated portions of the contacts from the conditioning process also gets a pro per plating The unit is again dried and the top replaced But you cry are we finished The answer is not yet The last step is quality control where the un
78. ing The original G2U relay is a sugar cube sized relay capable of switching 5A loads Although no longer available as the G2U other replacements are available such as the G8SN automotive relay OMRON G8SN 1C7 CUK 12 See Omron G8SN data sheet the G8SN is not stocked by Omron s north American distributors however it should be available in Europe E Also see the GSLE See Omron G5LE data sheet This relay is often the ZA rr 3 cause of erratic Rx and Tx problems If it becomes necessary to replace 3 RLO1 the T R relay on PB 2345 on the antenna relay board it is recommend that you replace it with the more popular G5LE 14 that is more commonly stocked by Omron s north American distributors The G5LE relay is a cubic single pole relay with contact ratings of 10 amps First remove the two rear 6146 final amplifier tubes loosen the back panel of the FT 102 so that it opens at the top undo the S0239 ring then carefully rotate the relay board forward to get access to the solder side Use solder wick to remove the old cube relay and replace it with the new G5LE 14 The relay has five contacts it is a SPDT relay as it is either in receive or transmit mode Main Chassis Relays RL1 amp RL2 RL1 amp RL2 located on the main chassis of the FT 102 are both 4PDT relays Nothing really special here they are readily available from several sources and as an NTE replacement part RLO1 and RLO2 are considered a general purpose 1
79. ing fed into the VOX control circuit at Q 3012 amplifier Q 3016 for auxilary output at the AF OUT jack to counter the VOX DC voltage that is produced by audio on the rear panel at the microphone This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 23 Carrier oscillator Q 3026 on the AF Unit delivers its signal after buffering by Q 3029 to buffer Q 6002 2SK19TMGR which signal is then divided by 256 at Q 6003 TC5082P and applied to phase detector Q 6013 along with the signal from Q 6005 Q 6013 then presents a DC output voltage proportional to the phase difference between the divided carrier signal and the divided VCO signal which is passed through active filter Q 6015 2SC1815GR back to modulator varactor D 6003 thus locking the VCO frequency to that of the carrier oscillator The remainder of the frequency modulated signal from VCO Q 6006 is buffered by Q 6007 2SC380TMY and delivered through IF amplifier Q 2003 on the IF Unit to the second transmit mixer Q 1008 on the RF Unit A sample of the buffered VCO output from Q 6006 is also delivered to the input of FM receive detector Q 6008 for IF monitoring of transmitted signals AM transmit A portion of the amplified and filtered speech audio from the tone amplifier Q 3004 on the AF Unit is delivered to AM modulator Q 6001 TA7069P on the AM FM Unit which also receives a
80. it is placed on a milliohm meter and cycled 50 times per contact No one reading on any contact can exceed 50 milliohms 05 ohm or the unit is not acceptable For this auction and in my own repair work a special gold plated socket will be supplied to be installed so that if a problem occurred the relay can be removed and replaced without dismantling the radio to unsolder it However if you are brave just solder it in place as I am confident it will be and stay good Relay 02 is in close proximity to a transmit mixer that runs continuously in receive as well as transmit That circuit is in the middle of the RF board inside the metal baffle on the upper side Because of this other circuit the relay was meant to be flat to the surface the board to reduce cross modulation I file the shoulders of the socket to get another millimeter closer to the plane of the board to reduce this interaction to a minimum As mentioned above the special socket which is also gold plated is supplied with the auction Well that about completes the description for this auction Enjoy the photo below which will permit you to conceptualize the this process better Some other points a fellow ham in Spain has a modification where a different configuration pin out relay is used The modification entails soldering to the bottom of a socket which is then used in the holes for the original relay However the traces on the bottom of the board also have to be cut and
81. ith dual meters on the front panel enables precise setting of the speech processor and transmit audio so that the operator knows exactly what signal is being put on the air in all modes A new peak hold system is incorporated into the ALC metering circuit to further take the guess work out of transmitter adjustment New VFO Design Using a new IC module developed especial ly for Yaesu the VFO in the FT 102 ex hibits exceptional stability under all oper ating conditions The circuit design accom modating the new module is extremely simple using only axial lead components and vastly decreasing the number of dis crete components that can cause instabi lity or fail in conventional analog and digital designs The VFO circuit is encased in a heavy cast aluminum housing to pre vent interaction with other circuits This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Options SSB nar CW wide 1 8 3 1 kHz with XF 8 2 HSN filter CW nar 600 1300 Hz with XF 8 2HC filter CW nar 300 800 Hz with XF 8 2HCN filter CW nar 500 1100 Hz with XF 455C filter CW nar 270 600 Hz with XF 455CN filter AM 6 12 4 kHz with XF 8 2GA filter IF Notch depth Better than 40 dB Sensitivity worst case in uV for 10 dB S N N except FM RF AMP ON RF AMP OFF SSB no optional filters 0 25 1 0 CW no optional filt
82. ity on your transceiver An extra AUX band position is available on the bandswitch for special applications Full Line Of Accessories For maximum operating flexibility see your Authorized Dealer for details of the complete line of FT 102 accessories Coming soon are the FV 102DM Synthesized VFO SP 102 Speaker Audio Filter a full line of optional filters and microphones and the AM FM Unit YAESU 4 The radio Unique Cascaded Filter System The FT 102 utilizes an advanced 8 2 MHz and 455 kHz IF system capable of accepting as many as three filters in cascade Optional filters of 2 9 kHz 1 8 kHz 600 Hz and 300 Hz may be combined with the two stock 2 9 kHz filters for operating flexibility you ve never seen in an HF transceiver before now All New Receiver Front End Utilizing husky junction field effect transistors in a 24 volt high current design the FT 102 front end features a low distortion RF preamplifier that may be by passed via a front panel switch when not needed IF Notch and Audio Peak Filter A highly effective 455 kHz IF Notch Filter provides superb rejection of hetero dynes carriers and other annoying interference appearing within the IF pass band On CW the Audio Peak Filter may be switched in during extremely tight pile up conditions for post detection signal enhancement Variable IF Bandwidth with IF Shift The FT 102 s double conversion receiver features Yaesu s time proven Variable Bandwidth System
83. l be making trouble for yourself and waste money needlessly because you will be exceeding the safe dissipation ability of the tube and the extra heat generated will deform the grid and screen in the 6146s When the tube has been poisoned in this way you will start to get thermal runaway where the cathode current creeps up and will blow your fuse watch the IC position of your meter if this happens Do not replace the fuse with anything larger than a 5 amp quick blow fuse and replace the tubes Nothing else will effect a cure once the fuses start blowing When the tubes have been heat damaged it will take five or ten minutes at first in transmit for the fuse to blow The times will become shorter as time goes on If you use a larger fuse or a slow blow fuse one of two things will happen The radio will either catch fire or blow the transformer and choke This course of events is the main reason that 102s go to the graveyard Although I can repair the resultant damage the ra dio usually smells from fire and I cannot undo that or the liquification of the lacquer from the transformer windings which get deposited all over the controls of the local board making adjustment of those controls in the future unreliable So the radio then goes to the parts graveyard SSB TRANSMIT And lastly in SSB I recommend that you do not run the ALC in transmit above S3 to S5 for best audio clarity Running the ALC meter into the S9 range acts like a processor
84. l of the tube numbers that are equivalent From 1970 until late 1979 when Motorola went out of the reconditioned equipment business I owned the Motorola reconditioned equipment center for the south central United States We reconditioned Motorola FM equipment for 14 states everything that Motorola sold reconditioned that was exported and everything that was sold to the United States Government this was the height of Viet Nam and the Government did buy reconditioned equipment At that time the Motrac series of mobile equipment was very popular Depending on the model these normally used one or two of the 6883A 8032 tubes It was only in the very latest models HHT E series LHT series and MHT series that Motorola had redesigned the equipment to use the 6883B 8032A 8552 tubes Around late 1976 or early 1977 Motorola decided to eliminate some of the tube types that they were stocking at the Schamburg Illinois parts depot Thus they started shipping 8552 tubes in boxes that were marked as 8032 The Motrac is unique in the fact that you cannot see the tubes when they are in operation they are enclosed in a metal heat sink In fact it is difficult to even tune a Motrac when the heat sink is not in place We went through from 50 to over 100 of the 8032 type tubes per week and within days were down to using the 8552 tubes in the 8032 boxes Within a very few days of starting to use the 8552 tubes we started receiving
85. l one more small Omron relay on the FT 102 I F Unit and one on the Control unit Since there is only one relay on each of these boards this should be pretty much self explanatory After replacing these relays you are finished with the relay modification for you rig with the one exception noted below The FT 102 has one more relay on the RF Unit This is the board that resides directly under the final amplifier tubes and houses the three tube sockets We did not include this relay in the kit The reason for this is the best thing to do if this relay becomes intermittent is just to remove it Final Unit PB 2355 why remove RLO1 7 EE hte Se Here is a little more info on RLO1 on the Final Unit The board with the 3 tube ge sockets RLO1 should drop the screen voltage from 210v to 160v when the te 8 s 1 as transceiver is switched to 10m The circuit on the Final Unit can bee see on page 2 E 63 of the technical supplement in the lower right hand corner see L07 R06 Q01 transistor switch 25c1815 which then goes to the coil of RLO1 How is this supposed to be done In the lower right hand corner of the Final Unit you see a contact at LO7 Labeled 28 Mhz There is a brown wire on this corner of the board That brown wire if you re willing to take the time and trace it back goes all the way back to the Local Unit PB 2345 How do I know I followed it back It s tack soldered on to the Local unit at the Cathode
86. larifier The FV 102 has a 5 digit digital display with a resolution to the nearest 10 hz FC 102 Antenna Coupler SUE Rea iuga This is a very versatile Antenna Tuner with a Power handing capacity of 1 2 KW input it fas a Bandswitched L C Pi network that can match a wide variety of mE vam oa S antennas including a single wire antenna to the FT 102 ora sh a oe CO I DL liniar amplifier on all HF bands O lt Included A in line wattmeter with 3 ranges 20 200 1200 watt with a peak hold system for observing peak power output with ease The FC 102 has a separate SWR meter The FC 102 uses internal relays for low loss push button selection of 2 antennas and two transmitters FAS 1 4R Remote antenna selector This remote antenna selector allows for the remote switching of 4 additional antennas direct from your FC 102 It may either be mounted inside the FC 102 Antenna Coupler or it may be mounted right on your tower reducing the use of coax lines to your shack The unit is controlled by a control line from the FC 102 The unit has a weaterproof diecast housing which hold the 4 independent relays This manual is a courtesy to you from With contributions 28 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers dB conversion table as used by Yaesu Filters for the Ft 102 fo
87. manufacturer changed from the 6146 to the 6146A to the 6146B The only sure way to know if a particular 6146W is of either the 6146 or 6146A type is to look for a code date of before 1964 since RCA introduced the 6146B in the middle of that year However some manufacturers did not start manufacturing 6146B equivalent 6146W tubes for at least a year after RCA introduced the 6146B RCA claimed that the 6146B was directly interchangeable with the earlier members of the 6146 family Unfortunately this did not hold true in most cases Collins Heath and probably other companies at first issued various documents saying that the use of the 6146B in their equipment was fine But this soon proved otherwise For example when the 6146B was used in the Collins 32S 1 32S 2 32S 3 32S 3A KWM 2 and KWM 2A it was discovered that the components in the neutralization circuitry burned up in a very short amount of time Thus Collins had to retract the statement that it was OK to use the 6146B Then due to the fact that the United States military establishment wanted to standardize on the 6146W equivalent of the 6146B the neutralization components had to be redesigned to allow the 6146B to be used Fortunately these changes did not affect the use of the earlier 6146 and 6146A in those transmitters manufactured to use the 6146B three types of tubes may be used without any problem in these transmitters Replacing the 6146 6146A tu
88. members aol com NC4LMAL And if you run into trouble contact me for assistance at NC4LMal aol com Postscript I have to ask for some forgiveness from my readers as I worked out the logistics for the mod in a few minutes and then did it while I took photos with my camera I was flying by the seat of my pants in a first try attempt and therefore my work was not as neat as usual How to change the meter lamps in the 102 To change the 102 meter lamps 4 05 03 please read all the instructions first before starting Open top case only 6 screws from the case but also loosen the handle cover screws two full turns to permit having the upper cabinet case to come up Remove the speaker leads push on connectors and place the upper cabinet aside Remove two screws holding the meter assembly in place 1 Carefully remove the brown tape 2 amp 3 and the scotch tape that seals the bottom of the meters Remove all of the clear plastic tape from the bottom of the meter housing Discard only the clear plastic tape as you will be reusing the brown tape later 4 With your fingernail pull at the top of the plastic meter housing until it pops off Figure 8 Be sure to insert the 7808 as shown Because the radio was rotated 180 degrees to get this photo please make sure that the printing on the plastic part of the regulator faces away from the board Polarity counts Y d ee T zS VOLT LINE TO 2 VOLT AM LINE EROM AW EM
89. mic filter XF 2002 XF 8 2GA If XF 2002 is not installed AM signals pass through XF 2001 When the NAR button is pressed on the front panel CW signals are passed through one of the optional narrow second filters in location XF 2003 this can be either the 600hz width 8 pole crystal filter XF 8 2HC or the narrower 300hz width 8 pole crystal filter XF 8 2HCN When the NAR button is pressed in the SSB mode the SSB signals are passed through one of the optional narrow SSB filters in location XF 2004 this can be the optional 2 9khz wide 8 pole crystal filter XF 8 2HS or the narrower 1 8khz wide 8 pole crystal filter XF 8 2HSN All signals from XF 2001 and AM signals from XF 2002 if installed are delivered to the second IF amplifier Q 2003 3SK73GR when the NAR button is off or the optional filters are not installed otherwise CW and SSB narrow signals from the second filters are applied to Q 2003 after narrow filtering After amplification the filtered 8 2khz IF signal is applied to the second mixer Q 2004 3SK73GR where it is heterodyned with the 8 67 Mhz second LO signal from the Local Unit producing the 455 khz second IF CW and SSB signals are then filtered by a third filter CF 2001 a 2 9 khz width 3 pole ceramic filter CMF455J1 unless optional CW narrow third filters are installed at XF 2005 either a 500hz 8 pole filter XF 455C or a 270hz 8 pole filter XF 455CN and the This manual is a courtesy to you from Fox
90. mpanies at first issued various documents saying that the use of the 6146B in their equipment was fine But this soon proved otherwise is much happier with the 6146 6146 family of tubes In addition I have owned transmitters like the Knight T 150 and T 150A that use the 6146 tubes Frankly these transmitters were much happier with the 6146 6146A tubes of 90 watts for CW and SSB operation and the 6146B had a rating of 120 watts for the same emissions There is another 6146 family tube that is superior for operation at least through 10 meters That is the 6293 This tube was designed for pulse service and is rated at 1 Kilo watt pulse power input The primary difference between these and the normal 6146 is that the plate is much heavier in its construction Back in the late 1950s and early 1960s we would almost kill to get our hands on a pair of these for our DX 100s etc The 6293 outlasts the 6146 in normal service by at least 5 times and often more than 10 times the life of the tube These tubes show up at hamfests swap meets etc from time to time If you see some of these definitely glomp onto them The 12 volt equivalent of the 6146 is the 6883 the equivalent of the 6146A is the 68834 and the 6146B is the 6883B Now there are the tubes that were manufactured for FM commercial service These series go as follows 6883 6883A 8032 6883B 8032A 8552 Again most of these are cross branded with al
91. necting the cathodes to ground It is about 0 6 ohms and the meter circuit works from the voltage developed across this resistor when current flows in transmit The problem of the runaway cathode current is almost always caused by improper tune up procedures Most hams know the 10 second rule where they do not key Modified 10 20 2004 APF SHIFT 7 WIDTH ES Suggestions to get the best out of your 102 1 ay Shift and Width Controls The shift and width controls are intended to suit your personal m S M ER dia preference by giving you the ability to customize the sound of your rig 1 and minimize interference The gray zone on the controls represents Ser ua the width of your passband Turning both controls at once via the friction E W lock either clockwise or counterclockwise shifts your passband but does USB f gt LSB not change your bandwidth The gray area remains the same size Both 1 1 f filter slopes move in tandem This is used when you want to eliminate e interference that is only on one side of the signal that you are listening to as it gives you two filter slopes that reinforce each other one from each of the two IF filters as rejection fighting devices First three APF Ti SHIFT WIDTH photos uss 2 If you rotate one control against the other the gray area will become JAN smaller narrowing of the passband width See photos 4 5 and 6 L f
92. nents cannot interfere with FM functions since AM will not be switched on The nice thing with this simplified modification is that a modified radio and unmodified boards are both forward and backward compatible Give it a try I will publish this to my 102 website at www members aol com NC4IMal as soon as I find a suitable place to locate the 8 volt regulator and will have a phototutorial on how to do it in the future 73 de NC4L Mal This surge modification in its complete and detailed phototutorial form is at http www amwindow org tech htm ft1020overshoot1 htm The modification can be done in an hour just click on the blue link at the top of this page 73 de NC4L Mal See the next pages for this Mod oneliner Basic research ie what you do when you don t know what you are doing This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 37 YAESU FT 102 AM SURGE MODIFICATION 10 10 05 Please note this surge modification in its complete and detailed phototutorial form is at the link below http www amwindow org tech htm ft1020vershoot1 htm Many folks have asked me to come up with a good AM surge modification for the 102 and so I listened and have come up with an excellent modification that can be done in an afternoon or less This modification was prompted by an email from Bill W3DUQ who has also published a mod f
93. ner Experience ie what you get when you don t get what you wanted This manual is a courtesy to you from Fox Tango International with contributions 34 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Yaesu power meter modification Over the years I have been bothered by the fact that the relative power output meter in the 102 is under damped in SSB mode This results in minimal meter movement even though a radio can be putting out in excess of 200 watts on SSB peaks This modification will not in any way affect the set power levels for continuous wave outputs like CW or FM or Tune It will however make your meter move much more responsively and energetically in the Single Side Band mode The Modification takes about 10 minutes It uses one 100 electrolytic capacitor and two solder connections A photo tutorial of the mod follows It is easy and fun to do and will permit your set to function better The first step is to remove the top cabinet of the radio and remove the fast on connectors for the speaker so that you can place the top case aside The first photo shows the radio with the case off and the area where you will be working The second photo identifies the variable pot for adjusting the meter This pot does not have to be adjusted but you will have to solder the capacitor onto its outer terminals The photo identifies the ground yellow and hot pink leads The middle post is the wiper arm
94. ng life for its power tubes as a sample my unit still has the original PA tubes digital age advantages I personally can live without all of those My unit bought locally in November 1997 was an european marketed Yaesu so it is called Sommerkamp but it is exactly the same except for the name plate Serial number is 2K060837 I got my unit with all the optional filters and AM FM module on it It has the XF 8 2HC and XF 455C filters for CW the XF 8 2HSN for narrow SSB and the XF 8 2GA for AM I should say that this transceiver is one of my favourites Piet hek bE a n e M Ue e 9 99 4 ac es Lil 2 IM NX jJ eee HE ALL This transceiver was top of the line for Yaesu at the beginning of the eighties and has a reputation of being a solid performer It can use some optional filters for SSB and CW which along its IF SHIFT WIDTH control and APF Audio Pass band Filter make it a highly selective and sensitive rig see table in the Technical Characteristics page It has plenty of controls digital frequency display two panel meters one is pictured below Basically almost everything you could ask for a rig except for computer control memories and those Please join us at Yaesu FT 102 Yahoogroup if you are interested in this transceiver Since 2001 Technical Characteristics All amateur bands from 160 to 10 meters WARC included LSB USB CW AM FM
95. nt panel metering The dual metering system provide simultaneous display of ALC voltage on one meter along with monitoring of plate voltage cathode current power out put and compression level of the processor on the multi meter providing for simplified monitoring of the transmitter PA When it AESU HF ALL MODE TRANSCEIVER FT 10 VER HEATER VOX GAIN DELAY WIE GAN COMP NB LEVEL S4 comes to knowing the FT 102 most likely the number one person in e X E X the county on this rig is Malcolm Eiselman NC4L Mal one can i hardly talk about the FT 102 without his name coming up Malcolm came up with a nice modification for the meter lamps as noted in the photos below MOX RF AMP NAR PROC NB MO This manual is a courtesy to you from With contributions 10 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Everything you ever want to know about FT 102 Relays The Truth About FT 102 Relays When it comes to the FT 102 transceiver the first topic that pops into one s head is RELAYS The fist thing you always hear about regarding the FT 102 is just how bad the relay situation is I really beg to differ on this because it usually winds up being only one or two relays out of the whole set that give you a problem thus the general opinion is that all the relays are faulty That will not be the case but either way you look at it these rigs are now going on some 24 years old so you really can t go wrong r
96. ode of operation to obtain optimum readability under a variety of conditions Two input jacks are provided selectable from the front panel SP 102P External Speaker Phone Patch The attractive styling of the SP 102P matches the FT 102 providing a combina tion shaped response speaker and hybrid phone patch for simple interfacing of the FT 102 with telephone systems Gain controls and an audio level meter are included on the SP 102P while intercon nections are designed specifically to mate easily with the FT 102 This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EB5AGV Wim PAOPGA and many other FT 102 lovers New Yaesu FT 1 02 Series Transceiver of Champions The long awaited new generation of Yaesu HF technology has arrived New research in improved receiver filtering and spectral purity is brought to bear in the competition bred FT 102 the HF transceiver designed for active Amateurs on today s intensely active bands Heavy Duty Three Tube Final Amplifier The FT 102 final amplifier uses three 6146B tubes for more consistent power output and improved reliability Using up to 10 dB of RF negative feedback the FT 102 transmitter third order distortion products are typically 40 dB down giving you a studio quality output signal Dual Metering System Adopted from the new FT ONE transceiver the Dual Metering System provides simultaneous display of ALC volt
97. ontributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 31 BLOWING FUSES IN YOUR 102 If you are blowing fuses in your 102 in transmit there are a couple of things you might want to know Below is my email answer to a fellow ham who had the above problem Hello Mario Yes that problem is the second most common problem with the 102 and is caused by the 6146 going into thermal runaway The problem is as you described an increase of the resting cathode current which starts out at 75 ma and gradually and then quickly increases until the fuse blows within a 10 minute time span This will happen in SSB even if you do no talking and shut the mic gain down There is only one cure and that is to get a new set of tubes as the ones you currently have in your radio have had the screen and control grids permanently deformed by excessive heat I mention cathode current as your meter does not indicate plate current The measurement circuit is inserted in that part of the circuit between the cathode of the 6146s and ground so that high voltage insulation is not required for the measurement circuitry If you look at the bottom of the power amp board solder side you will notice a white component before it is thermally damaged and charred which looks like an inductor because it is coiled This is just a coiled resistance wire with a white fabric insulation over the wire This is the shunt resistor con
98. ontrol of these functions in other radios takes two to three separate controls and you have to toggle back and forth bet ween those By the time you get it right wth two separate controls your station has stopped transmitting I believe this misconception stems from the instruction manual which is not very clear on the usage of the control With all of this in mind let this control become an extension of your brain and ears Learn how to manipulate it with your thumb pointer middle finger and wrist of one hand all three functions at once like playing a musical instrument After some practice and getting used to the adjustment procedure you will find every other type of radio awkward and cumbersome to adjust SHIFT WIDTH 73 de NC4L Mal One more note here the controls work differently in USB and LSB so that a clockwise turn on USB produces the same effect as a counterclockwise turn on LSB The controls are reversed in the opposite sideband The digital display Since the digital display in the 102 is in reality a hybrid frequency counter it is probable that when you are on the border of the next 100 cycle segment there will be a flicker of the last significant digit This has no effect on the stability of the frequency of the radio and only represents This manual is a courtesy to you from With contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers If you don t follow this rule you wil
99. ophone RF feedback from the PA stage allows for a very clean RF signal and the PA with 3x 6146B tubes deliver a solid 120 Watts to the antenna Everywhere in this set you can see that there was no compromise made by the Yaesu engineers and the resulting FT 102 is really a masterpiece that deserves to survive the next 25 years or so which is easely possible with some loving care of the big group of Yaesu FT 102 lovers In this Survival Guide we will try to collect in one volume all you need to know about keeping this excellent transceiver in a perfect condition for a long time to come The FT 102 was introduced late in 1982 and was produced till the end of 1984 and was then replaced by the very popular FT 757GX who uses a solidstate PA so there was no PA and preselector tuning necessary anymore Tubes were on their way out anyway in 1984 there were less and less tubes produced From the FT 102 pages of Carol Maher W4CLM Introduced in 1982 the FT 102 is one of the finest amateur radio transceiver ever made for its time and still remains an excellent option to buying a more modern Multi Kilo Buck transceiver produced now being manufactured in the 21st century Unfortunately for the FT 102 it did not last very long insofar as the US market By years end 1984 Yaesu was clearing the way for other transceivers like the FT 757GX Good marketing dictates not having too many models from the same manufacturer competing with each other Spor
100. or the 102 overshoot modification Bill correctly found that the cause of the overshoot was the 8 volt AM transmit supply line which was unstable at initial onset of transmit while it was going from a resting voltage of 0 to the working 8 volts He correctly undertstood that a stable 8 volt supply was needed and had to be on in receive as well as transmit so that there would be no variation of the vol tage at the onset of AM transmit Below is my email to Bill with the new and simplified modification and its explanation Hi Bill OK I have it figured out and it overcomes all the short falls of the initial modification Your initial modification had two very serious drawbacks 1 The radio and board were neither forward or back compatible By that I mean that the modified board could not be used in another unmodified 102 and that a modified radio could not accept a normal unmodified AM FM board 2 Because AM is also powered up when FM is selected in your modification both forms of modulation mix and the output on FM is very distorted by the simultaneous AM modulation components Starting with an unmodified radio and board cut the wire going to pin 1 of P60 J01 of the AM FM unit Leave enough room about 2 inches to solder another lead to it and insulate the other cut end which carried the AM tank on the board and making sure that the voltage inputs to the two circuits on the chip are in the right relationship Figure 1
101. over 30 degrees to the right so that it is like the leaning tower of Pisa Next take the cut lead of D6 and bring it behind and around D12 over to the cathode lead of D14 and solder them together See Photos Then turn the set on and check that the enunciator says AM W That s it Have fun and contact me if you have any problems This manual is a courtesy to you from With contributions 36 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers the old 8 volt supply to pin 1 so it doesn t short out Then go to the AF board and pick up a lead from pin 2 of J15 P38 This is noted to be a 12 Volt AM line It a yellow wire and is energized only when in the AM mode It is on continuously in both receive and transmit Tt is not on in the FM or any other mode as was the case with your mod This line yellow wire will be your new power source for the AM unit but it must first be converted to 8 volts I recommend using a three terminal 7808L L is for low power regulator cost is well under a dollar to bring the 12 volts to 8V Then connect the 8 volt output line from the regulator to the wire from pin 1 of P60 and it is done This will give you a constant 8 volts at pin 1 of plug 60 but only in the AM mode and will be activate in both receive and transmit so there will be no variation when going from receive to transmit This power line will not be active on FM or any other mode so that AM modulation compo
102. place the display In reality this zone is 4 cycles wide In other radios such as a Kenwood 430 just as an example the display number is generated by a divide by function of the computer chip This display will not change no matter how much drift there is in the operating frequency because it is not a counter but a rather a mathematical number processor If you adjust the master oscillator frequency in a 430 the radio will change frequency drastically but the display will not move I personally believe it is better to have a counter so you can observe any drift rather than having the drift be hidden from you even though you have to put up with the flicker The RF amp button If the S meter reads the background noise level at more than an S 5 with the RF amp button depressed on my recommendation is turn the function off out as you don t need the extra sensitivity If the control is out off the front end is bypassed and the signal goes directly to the first mixer for even better receiver performance This is the same as the AIP control in Kenwoods and the IPO function in the newer Yaesus On the other hand if the background noise level is less than an S 5 with the control pushed in on then leave it on Sensitivity on 20 meters is usually 15 uV or better for 10dB S N N with the control pushed in and 6 uV for 10dB S N N with it in the out position If you leave the control depressed when the bandnoise on receive is above S
103. portion is further amplified by the S meter amplifiers Q 2013 2SK19TMGR and Q 2014 2SA564AR before delivery through T R relay RL 2001 to meter II Noise Blanker Buffered output from the 20 khz filter XF 1001 is amplified by Q 2019 and Q 2020 2SC1583 as well by Q 2021 2SC380TMY before being applied to noise detectors D 2053 and D 2054 1N60 A portion of the output from Q 2021 is also rectified by D 2055 and D 2056 1N60 and amplified at Q 2022 2SC1815GR for feedback to Q 2019 and Q 2020 as noise blanker AGC The time constant of this AGC is adjusted by the NB LEVEL control on the front panel Output from the noise detector is buffered by gate control Q 2018 2SC1815GR before being applied to the noise gate D 2001 D 2003 who are located between the first IF amplifier and the first bank of crystal filters PB 2343A IF Unit Receiver The 8 2 Mhz signal from the RF unit is amplified by the first IF amplifiers Q 2001 and Q 2002 2SK125Y which are also operated from the 24V supply to maintain excellent large signal performance The amplified first IF signal is then passed through the noise gate composed of two schottky diodes D 2001 D 2002 19597 and a varactor diode D 2003 FC63 before being applied to the first set of crystal filters SSB and CW signals are passed through a 2 9 khz wide 8 pole crystal filter XF 2001 XF 8 2HS while AM signals are passed through a optional 6 khz wide 3 pole monolithic cera
104. power surge on the scope I can see an enormous surge when the 102 is first keyed in the AM mode I run my rig at 40 watts out on AM If my carrier is set to 40 watts and I key down the surge extends to over 200 watts The reason that surge exceeds my usual steady state key down power of 160 watts when the mode switch is in the tune or CW positions is that the 102 is a tube amp and the caps charge higher in any quiescent mode That used to be called dynamic headroom in the old Hi Fi terminology It is also the reason that the 102 can easily exceed 10096 modulation in AM on the positive peaks That cannot occur with solid state driven exciter amps as the ALC in these transceivers will stop any power increase beyond saturation stone cold I usually get all the 102s to run at 110 modulation after peaking This manual is a courtesy to you from Fox Tango International with contributions 38 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Figure 5 Using the 7808 pins as a template or calipers ruler of some other measuring tool mark the board and then drill the holes 29 fj PR je LF Figure 6 Scrape off the conformal coating around the holes for about 1 16 inch I used a Dremel battery operated drill and a dental bit but many other things will work out Figure 7 Scrape away the copper between each hole to make a solder pad for each leg terminal of the 7808 with
105. r aligament of their equipment 0 dBu 0 5uV 50 ohm Yaesu values HP 606A used in manuals signal generator First IF 8 2 Mhz Volts dBm ype Poles 0 2500 119 XF 8 2HS 8 pole 2 9 khz this is the standard filter 0 5uV 113 107 1 XF 8 2HSN 8 pole 20 Optional filters auV XF 8 2GA 3 monolith 15 8 XF 8 2HC 8 pole 20uV XF 8 2HCN 8 pole 158uV 5000 1 58mV bmV CMF 455J1 3 pole SSB CW 2 9 khz 15 this is the standard filter Second IF 455 khz Type Poles Mode Bandwiath 50mV 224mV 500mV Optional filters XF 455C 8 pole CW 500 hz XF 455CN 8 pole CW 270 hz Not all filters can be placed at the same time see your manual for possible combinations dB table courtesy of Jerry Becker Yaesu Serial Numbers The Yaesu serial number on the back of the set consists of a number a letter and 6 numbers You can see now at a glance the age The first number is the year of production 9 1979 0 1980 1 1981 a s o The letter is the production month C jan D feb E march F april a s o A and B are pre production runs and not used The next 2 numbers are the production run from 01 to The last 4 numbers are serial numbers from 0001 to 9999 So in every production run there are maximal 9999 units The 6 digits together form a unique serial number This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA
106. rating frequency This signal is amplified by Q 1007 2SC2407 Q 1009 2SC1589 and Q 1010 2SC1971 before application to the driver tube V 1001 12BY7A A sample of the input to the driver is fed to the RF Out jack on the rear panel for use with a transverter Output from V 1001 12BY7A is resonated by the preselector on the band selected by the band switch and then delivered to the Final Unit PB 2354 RELAY Unit On the Relay Unit the signal is fed through T R relay RL 9601 to the coaxial ANT jack with a sample delivered through the PO ADJ potentiometer on the rear panel and the METER SELECT switch to METER I NAR button in pressed AM signals bypass these filters All signals are fed from the third filter bank through the Q Multiplier composed of Q 2006 and Q 2007 2SC1815Y and notch filter Q 2008 2SC1815Y to the 455khz IF amplifier Q 2010 3SK73GR A portion of the amplified signal is then amplified by Q 2011 2SC1815Y and fed to the Narrow Band IF Out 1 jack the AM detectors D 2038 and D 2080 1N60 and the AGC detectors D 2039 and D 2040 both 1N270 The remainder of the amplified signal from Q 2010 is delivered to the product detector on the AF Unit The detected AM signal from D 2038 is delivered to the AF Unit for filtering and amplification The detected AGC signal from D 2039 is amplified by Q 2012 2SC1815GR and a portion of of the output is fed back to the IF amplifier Q 1001 for gain control while another
107. re will show up on your schematic diagram How is RLO1 switched on and off In the lower right hand corner of your final unit you will see a contact at LO7 Labeled 28 Mhz There is a brown wire on this corner of the board That brown wire if you re willing to take the time and trace the brown wire all the way back to the Local Unit PB 2345 its point of origin is tack soldered on to the Local unit at the Cathode end of D36 It could be on D35 36 37 or 38 as all the cathodes of these diodes are tied together on the local unit The other end of these diodes goes to P40 J01 which then goes to the band switch 10 meter positions RLO1 of the PA board should be bypassed Remove it Yaesu initially placed it there to switch the screen voltage to a lower value when on ten meters for better efficiency The relay was inconstant and gave them troubles so they just left it in the radio without switching it on or off Since they didnt make the radio with RLO1 active for regular production they took it out of the schematic so you will not see it although it is most certainly there It was easier to erase the parts from the schematic than alter and redesign the boards So just take the orange and white wire and place it on the other side of the relay so there can be no problems RLO1 on the RF final unit makes no sense having it on the board if you look at other transceivers like the FT 101ZD FT 901 902 and possibly other transceivers that used the 6146 f
108. s coming out of it Small signal relays are a special type and there is no degradation of the contact resistance over time if only small signals are used I like this repair since the relay is metal enclosed and shielded from RF It is also a good choice because a socket does not have to be prepared and there is no cutting and rerouting of the traces on the board so it is an easy modification Unfortunately some twisting of the lead wires has to be done since the pin out configuration is not the same but I figure the loss here would be compensated for by the fact that the relay is enclosed in metal and shielded from stray RF The disadvantage is that the relay is 20 00 in cost The model number is Teledyne 712 12 73 de NC4L Mal THE EB5AGV RELAY MODIFICATION Fellow 102 enthusiasts I have often been asked about the EB5AGV relay modification for RLO2 in the 102 I am not happy with this modification for several reasons I responded to a fellow ham in an email about this and thought it would be a good idea to put that letter and photo up on my 102 website for your enjoyment and education I hope you enjoy the explanation and photo NC4L Mal Hi Fred Yes I have seen the EBBAGV mod for RLO2 several times in radios that I have worked on and it is a mess I have enclosed a side by side photo of the trace side of the board for comparison Because the pinout configuration of that relay is different from the original several traces
109. s during transmission The incoming ALC voltage is also amplified by Q 2029 2SK19BL A portion of the output from Q 2029 is applied through meter amplifiers Q 2031 2SK19TMGR and Q 2032 2SA564A for delivery through T R relay RL 2001 to meter II during transmission The remainder of the output from Q 2029 is buffered by Q 2033 2SC1815Y and amplified by DC amplifiers Q 2034 and Q 2035 2SA564AR which together with Q 2030 2SC1815Y make up the peak hold circuit Q 2030 gives a constant voltage output proportional to the charge retained at capacitor C 2155 which is charged by the ALC voltage from Q 2033 when the ALC METER peak hold switch on the front panel is depressed The constant output from Q 2030 is then fed to meter amplifier Q 2031 in the same fashion as normal ALC for meter indication EOD HO PB2350 RECTIFIER B UNIT Bridge rectifier D1 S4V10 on the main chassis delivers 15 Volts DC to this board where it is filtered and regulated by Q 8501 2SA733 Q8502 uPC78L12 and Q1 2SB705R on the main chassis providing 12Vdc as the general VCC supply to all other units and to the cooling fan through the HEATER switch On the main chassis a portion of the 15Vdc present at the emitter of Q1 is diverted to regulators Q3 and Q4 UPC7812H Q3 thus providing 12Vdc for the panel lamps and Q4 providing 12Vdc to pin 2 of the EXT VFO jack on the rear panel for the external VFO supply AC voltage from the heater winding of the power
110. scillation If one insists on trying the 6146B tubes in place of the 6146 6146A types the very first thing to do is to neutralize the final amplifier If it will not neutralize then the 6146B tubes should immediately be replaced with the older type tubes If it does neutralize then the neutralization should be watched for several hours even days of operation If the neutralization changes then the 6146B tubes again should be replaced with the 6146 61464 series If the neutralization remains con stant after several days then use of the 6146B is fine in that particular transmitter I have in my shack a number of transmitters that use the 6146 6146A type of tubes These include Collins 329 1 32S 3 earlier model before the neutralization was changed Heath Apache DX 100 DX 35 SB 401 SB 110 Seneca Johnson Pacemaker and other transmitters as well Every one of these is much happier with the 6146 6146A family of tubes In addition I have owned transmitters like the Knight T 150 and 1 150 that use the 6146 tubes Frankly these transmitters were much happier with the 6146 6146A tubes Many amateurs are aware that the military ruggedized version was designated the 6146W I will get to these tubes a bit later However RCA also introduced in the early 1960s the 8298 tube for use in commercial mobile equipment The 8298 is just a heftier 6146A Motorola General Electric and quite a number of other commercial
111. t you are looking at the cathode current Your static cathode current should read about 75 ma Keep the set in transmit for the next ten minutes and make sure the current does not show an increase of 25 ma over the starting value after a ten minute time span The best tubes will show no increase on your current meter while fair tubes will show no more than a 25 ma gain Anything that exceeds a 25 ma increase wil blow fuses if not at the time then in the near future So please get a certified set of new tubes from a reputable wholesaler not on ebay so that you can be sure the tubes you purchase are new and not someone else s pulls because they noted the same problem Most people when replacing tubes put the pulls in the new boxes and over the years forget sometimes intentionally that they are not good In addition please check that the resistance between the top and bottom connections of your choke please make sure that the high voltage has been discharged is more than 4 4 ohms as when the choke is subjected to excessive currents sections of the choke short out That results in decreased output on the higher bands like 10 meters If your shunt resistor s insulation different from the choke is charred leave it alone as there is no with problem with this It does not need to be replaced And lastly make sure that you do not use more than a 5 amp quick blow fuse This manual is a courtesy to you from Fox Tango International with c
112. ting three 6146 in the final amplifier stage can have its advantages over that of transistors The concept of of the 3 tube final amplifier with negative feedback was indeed revolutionary for the amateur market however tube type transceiver were on their way out by the mid 1980s and eventually the FT 102 was discontinued The rig remains a favorite among those who have used them and it maintains a cult like following by those users in the know even to this day One of the first things that you notice about the FT 102 is it s use of three 6146 final amplifier tubes in the final amplifier tank circuit The forgiving nature of the three 6146 finals to an occasional high VSWR with full output gives one peace of mind not always enjoyed by completely solid state transceivers The three 6146 tubes gives the FT 102 more consistent power output and improved reliability over tube transceivers produced in the past such as the FT 101 with its sweep tube finals The FT 102 claims 10db of negative feedback with third order distortion of 40db down giving the transceiver one of the best sounding audio of any transceiver ever produced without the use of studio equalizers in use by the ESSB enhanced SSB audio crowd found on the amateur bands of today My experience with this transceiver is that the longer its on the better it sounds and audio reports are fantastic Another eye catching feature of the FT 102 similar to the of the Yaesu FT One is its use of a dual fro
113. used these tubes in all sorts of FM communications equipment for both low band 30 50 MHz and high band 150 8 172 MHz When the 6146B was introduced RCA announced the 8298A commercial equivalent of the 6146B In fact most of the RCA 6146B tubes were cross branded with the 8298A number in addition to the 6146B Those companies who were manufacturing 6146 series tubes for the military changed from the plain 6146 to the 6146A to the 6146B as the military decreed However all of the tubes manufactured under military contracts were known as 6146W and to my knowledge nothing was done towards marking the tubes as being equivalents of the 6146 6146 or 6146B The only way of telling is from the date code which is printed on each tube Different manufacturers changed tube types at different times Also I know of no master list telling on what date a particular manufacturer changed from the 6146 to the 6146A to the 6146B The only sure way to know if a particular 6146W is of either the 6146 or 6146A type is to look for a code date of before 1964 since RCA introduced the 6146B in the middle of that year However some manufacturers did not start manufacturing 6146B equivalent 6146W tubes for at least a year after RCA introduced the 6146B RCA claimed that the 6146B was directly interchangeable with the earlier members of the 6146 family Unfortunately this did not hold true in most cases Collins Heath and probably other co
114. vice Manual direct from the Fox Tango FT 102 site at or from Kevin Withemarsh YAESU manual site where you sul find almost every YAESU manual that you may need His library website is on Take note for some of the bigger sized manuals is it necessary that you join the Fox Tango International club because downloading of them is restricted to members MODE TRANSCEIVER FT 402 YAE SU HF ALL 2 amp AIN COMP NB TEVEL Te POWER HEATER VOX GAIN DELAY Eg fo 3 E NODUM reper M mw P M 2 7 d gt NY M i ig ee AR FASI 4 SS gt ON e a SLOVE NAR PROC NB M F RAE ALC METER Gs N HR ANS Hs oe e III eos 9 194 moto AF 9 Rf MODE PHONES TUNE fo 0 a p m usa ym AM 4 Ld A y 7 AR N a a gt S p e DC S nC i This manual is a courtesy to you from Fox Tango International with contributions from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers 50
115. way too many examples of the 6146B causing problems in relation to the cases in which the substitution has no effect As I said before neutralize and keep checking the neutralization for several days if you do replace your 6146 6146A tubes with 6146B types Otherwise you can find yourself with TVI burned out tubes and other damage to your transmitter You must be VERY careful when dealing with the various tu bes of the 6146 family otherwise you just might be in for some very interesting problems Substitute if you must but be aware that you are treading on thin ice Dear Receiver You have just received an Irish virus sm 1 ince we are not so technologically advanced in Ireland This is MANUAL virus Please delete all the files on your hard disk yourself and send this mail to everyone you know That d be grand Tanx Paddy O Hacker at paddy bejaisus com Join us at Fox Tango International Fox Tango International is a club where all users of Yeasu equipment find equally minded hams who help each other to keep their older and newer Yeasu equipment in excellent condition In our forums we discuss all kinds of problems that arise and ways to solve problems and find solutions for hard to get spareparts and much much more Please visit our website and see for yourself The membership is free of charge so join us to keep your Fox Tangos on the air FT 102 Manuals You can download the FT 102 User and Ser
116. wire some PCB traces IMPORTANT USE THE SHORTEST POSSIBLE LENGHT OF WIRING AND IF AVAILABLE USE SMALL GAUGE COAX Here you have the pictures to do this RL1002 replacement I RL1002 replacement Ib This picture shows the wiring of the socket adapter based on a 16 pin DIL socket and also the internal configuration of the original and replacement relays 2 3 NX P 2 RL1002 replacement II Here you have the necessary changes to do in the PCB In figure 1 you have the original PCB traces Cut the traces at points A and B as shown in the figure 2 Then put wire bridges as shown in figure 3 discontinued lines crossing A and B and then another one in C Enlarge hole D to prevent contact with this pin Put the socket adapter and plug the OMRON G6A 234P relay on it Then the connection which was soldered to point C goes now to point D Here you have a picture of the modified zone NOTE I DON T STOCK REPLACEMENT RELAYS SORRY FT 102 Yahoogroup If you are interested in this transceiver please join us at http groups yahoo com group ft102 Since 2001 FINAL unit relay EB5AGV s FT 102 Power Amplifier tuning In order to save lots of time opening PA cage As most tubed power amplifiers one exception is the removing tubes and so on you can try to get out the Central Electronics CE 100V and CE 200V the FT 102 relay without dismantling the board I did that way
117. xactly right So you have a choice try Malcolm s way and maybe have to fight with it Or pull the front my way and still fight with it but hopefully less of a fight getting RLO5 installed Remember what I said in the second sentence at the top TAKE YOUR TIME Most hams have more then one rig in the shack today so don t get in a big rush to do this job New RLO5 Installed I was in no rush and even with pulling the front panel loose the whole process of replacing every relay on the RF Unit took me a little over an hour maybe an hour and a half to do the entire RF Unit relay replacement job You can do it how you please but I feel by pulling the loading shaft it allowed me to get my fingers into the area of RLO1 RLO2 on the RF unit much more easily New RLO3 and RLOA Installed RLO3 and RL04 are fairly straight forward and easily enough to replace Make sure when removing the old relays your soldering iron is hot enough to melt the solder but not so dammed hot you destroy the circuit board traces when removing the relays Use SOLDER WICK to suck up the excess solder DO NOT USE A SOLDER SUCKER When the relay is out use the solder wick again to make sure the hole is completely clean before attempting to put in the new relay in place By the time you get this far you have completed the hard part and will have installed six out of eight relays included in the Fox Tango relay package FT 102 IF Unit FT 102 Control Unit You will instal
118. y keyed up for ten seconds because the tubes are only rated for 50 duty cycle In fact I recommend that you key up for 15 seconds for every 10 seconds on time when tuning up The extra heat which is generated by doing the procedure wrong deforms and warps the grid assemblies and once this happens it is a permanent abnormality Most hams only know the fuse blows as they keep their meters in the power position and you will not see any abnormality when looking at the power output since the abnormal extra current does not generate any additional power to the antenna Most hams especially if they are older get angry with the radio and so they keep putting in larger and larger fuses or slow blow fuses This results in several problem such as the set catching fire blowing the transformer shorting the choke supplying the 6146s should measure more that 4 4 ohms and cooking the shunt resistor I have seen these damages over and over This is the main reason that the 102s wind up in the radio grave yard I now have ten parts radios which were purchased from people who did not want to go to the extra expense of replacing the transformer and didn t want to pay to ship a broken and smoke smelling radio back There are many other radios that I would not make an offer to buy as I now have plenty of these parts radios I recomment the following test Place the set into transmit SSB and turn the mic gain to off with the meter switch in the IP position so tha
119. y problems please feel free to drop me a note 73 Carol W4CLM Final Board PB 2355 RLO1 Join us at Fox Tango International http foxtango org Fox Tango International is a club where all users of Yeasu equipment find equally minded hams who help each other to keep their older and newer Yeasu equipment in excellent condition In our forums we discuss all kinds of problems that arise and ways to solve problems and find solutions for hard to get spareparts and much much more Please visit our website and see for yourself The membership is free of charge so join us to keep your Fox Tangos on the air FT 102 Manuals You can download the FT 102 User and Service Manual direct from the Fox Tango FT 102 site at Pttp foxtango org FT 102 FT 1029 620Page htrn or from Kevin Withemarsh YAESU manual site where you will find almost every YAESU manual that you may need His library website is on http foxtango ham radio op net Take note for some of the bigger sized manuals is it necessary that you join the Fox Tango International club because downloading of them is restricted to members This manual is a courtesy to you from Fox Tango International with contributions 18 from Carol W4CLM Mal NC4L Jos EBBAGV Wim PAOPGA and many other FT 102 lovers Yaesu FT 102 troubleshooting hints by Carol Maher W4 CLM FLUCTUATING POWER OUTPUT check 6146 finals for arcing check PA RFC choke FT 102 POOR AUD
120. z reference signal derived from 10 Mhz crystal oscillator Q 4026 2SC945Q buffered first by Q 4028 2SC945Q and then divided by 10 at Q 4019 74LS90 and again by 2 at Q 4020 MC14518 before final buffering at Q 4021 25C945Q Q 4018 provides a DC output proportionally to the phase difference between the VCO derived input and the reference derived input The Dc output is then delivered through active low pass filters Q 4022 and Q 4023 2SC732GR to the varactor of the selected VCO thus locking the VCO frequency to the reference oscilator If the output from phase detector Q 4018 is too great to allow locking of the VCO an unlock signal is delivered through amplifier Q 4016 2SA733 to the unlock switch Q 4009 2SC945Q which disables first LO buffer Q 4008 removing the first LO signal from the RF unit A portion of the switching signal from Q 4009 also switches Q 4010 2SC945Q which delivers a blinking command Signal to the Counter Unit causing the display to blink whenever the PLL is unlocked The PLL local signal is derived from a 10 Mhz reference oscillator Q 4026 and 19 21 Mhz VCXO Q 4033 2SC945Q along with the VFO input Output from VCXO Q 4033 shifted appropriately for the selected operating mode by Q 4032 2SC940Q and according the IF shift function is buffered by Q 4035 2SC945Q and applied to PLL local first premixer Q 4024 SN76514 which also receives a 5 0 to 5 5 Mhz signal delivered from the VFO Unit or external VFO

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