Yaesu FT-817 (FT 817 FT817) user and service manual, modifications

   
 
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Yaesu FT-817 (FT 817 FT817)
FT-817
Programming interface schematics for Yaesu: programming interface, Yaesu 4 pin plug
Programming software for Yaesu FT-817 (FT 817 FT817) : 
PDF User Manual for Yaesu FT-817 (FT 817 FT817) : 
PDF Service Manual with schematics for Yaesu FT-817 (FT 817 FT817) : 
Diagrams for Yaesu FT-817 (FT 817 FT817) : Yaesu FT-817 (FT 817 FT817) GIF schematics

Mods for Yaesu FT-817 (FT 817 FT817) :
   Yaesu FT-817 (FT 817 FT817) Servicemenu
   Yaesu FT-817 (FT 817 FT817) --> DYC-817 Modification
   Yaesu FT-817 (FT 817 FT817) Mods for DF4ZS RF SpeechProcessor
   Yaesu FT-817 (FT 817 FT817) and DRM (Digital Radio Mondiale)
   Yaesu FT-817 (FT 817 FT817) transverter switching
   Yaesu FT-817 (FT 817 FT817) DYC-817 and DF4ZS RF SpeechProcessor audio comparison
   Yaesu FT-817 (FT 817 FT817) Adjustment points
   Yaesu FT-817 (FT 817 FT817) Jumpers by Software
   Yaesu FT-817 (FT 817 FT817) charge modification
   Yaesu FT-817 (FT 817 FT817) FM mod improvement (more basses)
   Yaesu FT-817 (FT 817 FT817) Improvement of stock mic
   Yaesu FT-817 (FT 817 FT817) KA7OEI FT-817 page
   Yaesu FT-817 (FT 817 FT817) Mod/Fix
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   Yaesu FT-817 (FT 817 FT817) 10 Watts output
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   Yaesu FT-817 (FT 817 FT817) Et enkelt front løft til
   Yaesu FT-817 (FT 817 FT817) TX frequency / Region setting
   Yaesu FT-817 (FT 817 FT817) RX-LED disconnect
   Yaesu FT-817 (FT 817 FT817) Other Observations/Comments
   Yaesu FT-817 (FT 817 FT817) CW Filter Installation
   Yaesu FT-817 (FT 817 FT817) paddle modification, very useful for CW ops.
   Yaesu FT-817 (FT 817 FT817) HF Clipper fur Einbau in das Handmikrofon
   Yaesu FT-817 (FT 817 FT817) AGC modification
   Yaesu FT-817 (FT 817 FT817) Improvement of the ALC - better modulation and throughput
   Yaesu FT-817 (FT 817 FT817) Improvement of the optional microphone MH-36 E8J with DTMF
   Yaesu FT-817 (FT 817 FT817) Servicepoints
   Yaesu FT-817 (FT 817 FT817) Tips
   Yaesu FT-817 (FT 817 FT817) Hidden menu
   Yaesu FT-817 (FT 817 FT817) Extended TX
   Yaesu FT-817 (FT 817 FT817) Battery mod

Yaesu FT-817 (FT 817 FT817) technical specifications : Yaesu FT-817 (FT 817 FT817) technical specifications



Yaesu FT-817 (FT 817 FT817) AGC modification

Hi YLīs XYLīs and OMīs,

Regarding the AGC (RX) of the FT817 I got some questions from some users. The dynamic of the AGC-regulation isnīt really nice researched. If you use the rig specially on 40m and/or 80m where 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 FT817.

To fix this is only recommened for let me call it "advanced users". The rig has to be opended on the upper side (where the loudspeaker fits). Now you remove all connected cables from the visible main board and all srews. After this you can remove the board.

Please turn the board to the soldered side and locate C1324, which is nearest to the connected data-cable going to the user-interface (front panel).

Near this C you find R1305. Original values are 1 K and 2,2uF.

Now the mod:

Please put 10 Ohms in parallel with R1305 and 10uF parallel to C1324.

Please be carefull in doing this, the SMD-parts are very small !

In my case, I had no SMD-C available (and I didnīt want to use Tantal-Cīs), therefor I connected the 10uF via cable to the upper side of the main board. Itīs not looking nice, but nevertheless itīs working.
Values over 10uF (470uF) are better, but the S-meter stand still at approx. S6-7 afterwards. Itīs not recommended to go over 10uF.

Good luck and again: be carefull!!!

Thanks for reading this and I apologize for the picture, which is not exactly focused. (I saw it too late...)

Click to enlarge (83 Kb) Click to enlarge (115 Kb)


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