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The KA7OEI FT-817 pages - Modifications.
http://www.ka7oei.com/ft817_mods.html
My '817 noise-blanker modifications in a nutshell: - I added a 5 pf capacitor across T1027 and used the (above) revised alignment procedures to allow tuning through resonance, thus maximizing signal into the blanker. - R1345 was added to slightly decrease AGC action in the noise blanker. I used a value of 47k, but your resistance may vary.
More talkpower for the FT-817: a very simple microphone ...
https://hamradiosoul.wordpress.com/2016/04/24/more-talkpower-for-the-ft-817-a-very-simple-microphone-modification/
All you need to do is take out the resistor and replace the 0.33uF capacitor with a 47nF (473) one: Super-simple mod of the MH-31 for more talkpower on the FT-817. This will achieve two things: increase the output of the mic a little. shift the frequency of the audio low-pass filter a little for more punchy audio.
The KA7OEI FT-817 pages - Customizing the FT-817
http://www.ka7oei.com/ft817_cust.html
Modification of the VHF reflectometer to make it read 50 ohms properly (briefly mentioned on the FT-817 RFPA page.) Addition of the One Board Filter ("OBF") (tm). This allows the use of both the Collins SSB and CW mechanical filters. Addition of the One Big Punch ("OBP") (tm). This is an audio speech processor that may be installed inside the FT-817.
Yaesu FT817 / FT817ND Full TX Modification - YouTube
https://www.youtube.com/watch?v=VCNIyuTF2G4
Short video going over modifications to the Yaesu FT817ND to allow transmit over 1.8 - 33mhz , 33 -56mhz , 140 -154 mhz,and 420 - 470 mhz. And the results th...
FT-817 Cheat Sheet - RadioManual
http://radiomanual.info/schemi/YAESU_HF/FT-817_user_guide.pdf
knob adjusts the receiver audio volume level presented to the speaker or external speaker. Clockwise rotation increases the volume level. (3) SQL/RF. Knob In the USA version, this (outer) SQL/RF. knob adjust the gain of the receiver’s RF and IF stage. Using Menu Selection 45, this control may be changed to function as a Squelch
mods.dk - Articles for Yaesu 'FT-817'
https://www.mods.dk/index.php?ModelId=63
Power Increase mods for Yaesu FT817 and FT817-ND: 20 Mar 2008: Li-Pol power supply for Yaesu FT-817: 19 Feb 2008: Reducing AF wideband noise: 25 Dec 2007: FT817 Transverter PTT interface: 11 Oct 2007: FT-817ND SSB/CW Receiver Distortion Reduced: 19 Jun 2007: FT-817 Suppressor Diode D3052: 05 Apr 2007: Intermittent rear antenna socket connection: 28 Jan 2007
Yaesu FT-817 (FT 817 FT817) user and service manual ...
http://www.hampedia.net/yaesu/ft-817-extended-tx.php
Yaesu FT-817 (FT 817 FT817) paddle modification, very useful for CW ops. Look down on the back of front panel, with the VFO knob just left of center. Look at the jumper locations just above the VFO knob on the circut board. Solder the first four jumpers and remove the solder at location five.
Data mode communication on the Yaesu FT-817 - …
https://www.qsoshack.com/data-mode-communication-on-the-ft817/
Trim the transmit and receive levels on the SignaLink. Adjust the RX knob on the Signalink so the waterfall displays good clear data streams. The FT-817 volume knob should have no effect. When transmitting, adjust the TX knob on the Signalink so that the FT817 bar shows just a few transmission bars (ALxxx).
FT-817(ND) DIY Data Modes miniature USB interface
https://www.yo3ggx.ro/ft8x7data/FT817_DIY_data_modes_interface.pdf
5. Desoldering the two audio jack (Mic and Headphones) 6. Desoldering the USB connector (male) 7. Cut the cable from the USB CAT interface at around 300mm from the miniDIN connector. 8. Extract the CAT USB/serial interface from the plastic case 9. Desoldering the cable from the pins marked GND, RX, TX 10. Desoldering the USB connector (male)
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