Kenwood TM-V71A

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Daniel Wee
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Kenwood TM-V71A

Post by Daniel Wee »

Attachments
Kenwood TM-V71A Resources.rar
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TM-V71A Service manual.pdf
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Kenwood TM-V71.pdf
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Daniel Wee
Site Admin
Posts: 2422
Joined: Wed 25 Feb 25 2009 8:00 pm

Re: Kenwood TM-V71A

Post by Daniel Wee »

Daniel Wee
Site Admin
Posts: 2422
Joined: Wed 25 Feb 25 2009 8:00 pm

Re: Kenwood TM-V71A

Post by Daniel Wee »

Second digipeater hardware

1. Vention USB soundcard (Challenger SGD10)
2. Raspberry Pi 4 8GB
3. PR1 and PKD pass through 1:1 Bourne audio transformer with 10uF on radio side
4. GPIO 18 as PTT
5. GPIO 23 as DCD
Daniel Wee
Site Admin
Posts: 2422
Joined: Wed 25 Feb 25 2009 8:00 pm

Re: Kenwood TM-V71A

Post by Daniel Wee »

Packet levels

On our implementation, with the notch on the top and looking into the connector from the 1-o'clock position clockwise:-

1. PR1 from the radio into the TNC
2. PKS - PTT keying
3. output from the TNC to the radio PKD (calibrated for an output of 40mV p-p)
4. Ground to radio DE

The output from the soundcard is quite strong and requires a 10k-pot to bring the level down. That said, the alsamixer values we settled on in the TNC are as follows:-

Speaker 28
Mic (muted) MM
Capture 48
AGC (muted) MM
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