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Pagina 10

KB2LJJ Radio Mods Database and Manuals

03/05/2008 08.24.31

http://www.kb2ljj.com/data/yaesu/ft-817.htm

Best wishes and good luck !

Andreas
DL6EAT

Subject:

FT817 ALC mod 1uF to 47uF C1113

Hi;
I looked into the ALC mod you posted for the FT817. You changed a 1uF cap to 470uF

I entered the circuit into a simulator and got these waveforms. It appears this mod lengthens the
ALC "release time". Check out the simulate ALC output voltage waveforms below

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Summary of Contents for FT-817 -

Page 1: ...the bank buying alkaline cells and give you portable batt power Two words of caution As with all mods the warranty is affected do so at your own risk By during this mod you have now disabled the prot...

Page 2: ...ut of the connector It will then pull out This way you can push it back later and no one will ever know Extended TX for FT 817 1 Remove the front panel 2 Look down on the back of front panel with the...

Page 3: ...tabs holding the front panel to the chassis and slightly move the front panel forward 7 Disconnect the ribbon cable that connects the chassis and the front panel 8 Remove the jumper at location on Fro...

Page 4: ...hand jumper IDs to 6 9 J4006 J4009 that should be shorted in order to open the transmit range of this rig My radio was a type BY3 purchased in Singapore Feb 2002 When I opened it up jumper five J4005...

Page 5: ...rs 3 4 and 5 solder bridged and the rest are OPEN My question referring to the original post Is do I unsolder 3 and 4 also along with 5 and solder 6 thru 9 Or do I need to leave 3 and 4 as they are no...

Page 6: ...hrt irgendwo unterbrechen und die Enden isolieren damit ein Accu erkannt wird Wer wegen der Garantie eine reversible nderung vorzieht kann im Stecker den entsprechenden Pin mit etwas Geschick und eine...

Page 7: ...gibt sich die oben beschriebene Variante Vorsicht beim L ten etwas Erfahrung sollte man schon haben um keine unerw nschten Kurzschl sse zu produzieren Ganz wichtig Nach dem Zusamenbau mu unbedingt der...

Page 8: ...MHz 115 37 50M L3 RF Power L3 50MHz 64 38 50M L2 RF Power L2 50MHz 23 39 50M L1 RF Power L1 50MHz 1 40 VHF HI RF Power HI 144MHz 140 41 VHF L3 RF Power L3 144MHz 93 42 VHF L2 RF Power L2 144MHz 28 43...

Page 9: ...B is not reaching the 5W mark even when the CW tone and in FM the rig runs on specified power I walked through the circuit diagram and found the reason The capacitor C1113 on the main board is too sma...

Page 10: ...nd good luck Andreas DL6EAT Subject FT817 ALC mod 1uF to 47uF C1113 Hi I looked into the ALC mod you posted for the FT817 You changed a 1uF cap to 470uF I entered the circuit into a simulator and got...

Page 11: ...ou I thought a short release time would raise the average power It works so I must be missing something In the schematic below V1 simulates a 500mS pulse coming from the Forward detector The ALC drive...

Page 12: ...mall electret microphone is inside But after opening the mic the reason was easealy located The necessary DC voltage comes to the microphone via a small resistor The value of this resistor is by far t...

Page 13: ...often high signal strenths are present the RX sounds like the AGC is switched completely off If using with small signal amplitudes it sounds much better This seems to be a general problem of the FT81...

Page 14: ...he SMD parts are very small In my case I had no SMD C available and I didn t want to use Tantal C s therefor I connected the 10uF via cable to the upper side of the main board It s not looking nice bu...

Page 15: ...des Yaesu FT 817 Author Joachim M nch DF4ZS Joachim M nch DF4ZS 7 Dezember 2001 Vorweg f r Sch den die durch den Umbau verursacht werden bernehme ich keine Haftung Bei mir und einigen OM s funktionie...

Page 16: ...rofongeh use legt man f r die folgende Anleitung so dass die Kabel ffnung zum eigenem K rper zeigt Die PTT Taste ist nun auf der rechten Seite Das Clippermodul legt man mit der L tseite nach unten ber...

Page 17: ...Pagina 17 KB2LJJ Radio Mods Database and Manuals 03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm Zweitonsignal ungeclippt stark geclippt Eintonsignal...

Page 18: ...tte ich bereits einen Mini Clipper konstruiert der von OM s die diesen durchweg ungeschirmt in Handmikrofone eingebaut haben gut beurteilt wurde Bis 100 Watt sind Probleme mit HF Einstrahlung nicht be...

Page 19: ...and be in a comfortable operating position so using this paddle meant attaching it to some kind of base and operating on the desk top in the conventional manner The FT 817 has the option of keying the...

Page 20: ...a 20 KB2LJJ Radio Mods Database and Manuals 03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm Attached Detached Yaesu FT 817 CW Filter Installation Author Dave Fifield AD6A By Dave Fifield...

Page 21: ...e the full size version 1 Removing the top cover is simple first take off the shoulder strap brackets 4 screws and then remove the 5 screws in the top cover and it pops right off don t undo the two sc...

Page 22: ...03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm 3 Here s the filter correctly oriented ready to be put in Note that the 3 pin connector is on the LHS and the 4 pin connector on the RHS...

Page 23: ...You re almost done You will probably panic at this time as I did because as you switch through the modes from USB LSB CW CWR etc the rig seems to be stuck in SSB filter mode There s one more thing yo...

Page 24: ...ttom end of 40m sounds REAL NICE Folks if you are going to do CW seriously with the FT 817 you will simply HAVE to get the YF 122C filter option It s a must have IMO This modification can also be foun...

Page 25: ...ls 03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm I went searching for other mod space there s some between the front panel assembly and the diecast chassis and some more between the CW...

Page 26: ...hold the front edges of the top and bottom panels in place If you take it apart please be VERY careful not to damage the front panel connector ribbon or connectors they look fairly delicate Lastly you...

Page 27: ...isassemble the transceiver remove the front panel whilst taking care to carefully disconnect the cable between the front panel and the body of the radio Remove the rubber band on the VFO knob and remo...

Page 28: ...l For example this makes it possible to expand the Tx coverage of a European FT817 so it will work if travelling to the USA but to retain the correct Euro repeater shifts It should also take away some...

Page 29: ...a 29 KB2LJJ Radio Mods Database and Manuals 03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm Et enkelt front l ft til FT 817 Author LA9MGA Av LA9MGA Helge Karlsen Bilder LA2PIA Petter S r...

Page 30: ...r jeg vil benytte skulder reima L fteanordningen skyves helt opp i sporet til reima n r den ikke er i bruk og den er dermed nesten helt skjult Hvis du benytter m lene p tegningen vil dette gi et l ft...

Page 31: ...Pagina 31 KB2LJJ Radio Mods Database and Manuals 03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm Front l ftet i bruk N r du drar plastproppen opp er det meste gjemt bort...

Page 32: ...ft 817 htm Dette er plastdelene FT 817 Mod 2 Collins Filter CW AND SSB Author Lutz W4 DH7LK Risk You will loose the warranty Fun You will have a fantastic rig with a 2 4 Khz Collins filter in SSB tra...

Page 33: ...nced OM to help you 1 See page 74 of the Operating Manual and follow steps 1 and 2 2 Remove the PCB MAIN UNIT watch on the battery connector and the 3 pin connector in the middle of the board Remember...

Page 34: ...Pagina 34 KB2LJJ Radio Mods Database and Manuals 03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm Original SSB Ceramic Filter removed Position of SSB filter...

Page 35: ...Pagina 35 KB2LJJ Radio Mods Database and Manuals 03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm SSB filter wired CW filter wired...

Page 36: ...aster This procedure here will increase power to 10 watts on HF bands only but ensures that the DC Over current protection will reduce power into abnormal loads that the SWR detector cannot detect SWR...

Page 37: ...se changed settings hold the F button for two seconds when finished User comment Subject blown finals and 10 W modification Hi OM This topic is very hot in the world wide FT817 discussion groups I thi...

Page 38: ...ck 73 Johnny Siu VR2XMC Yaesu FT 817 CAT interface Author Edwin PE1PWF Dit interface is bedoeld om een Yaesu FT 817 te besturen via de PC Het kan worden gebruikt om modes frequenties of geheugenkanale...

Page 39: ...interface is een BMP bestand helaas gaat printen dan wat onhandig maar met bijvoorbeeld Irfanview kun je het afdrukformaat mooi verschalen Ik gebruik versie 3 17 en als ik het plaatje afdruk op 1 05x...

Page 40: ...ng some SMD Unfortunately I had to use a bitmap file for the layout you have to scale this to a PCB size of 69 42 5 mm I use IrfanView version 3 17 for printing my PCB layout scaled x 1 05 gives me th...

Page 41: ...Pagina 41 KB2LJJ Radio Mods Database and Manuals 03 05 2008 08 24 31 http www kb2ljj com data yaesu ft 817 htm...

Page 42: ...my story Recently I found that my 817 occasionally did not put out any power on 440 transmit when using a duck on the front BNC Further examination showed that when set to low power and the antenna wa...

Page 43: ...remely portable HF through UHF all mode transceiver capable of operation on all amateur bands from 160 meters through 70 cm excluding unfortunately 222 MHz It is also considered to be a QRP transceive...

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