radiotelegram

Record Baofeng voice transmissions with RTL-SDR and send them as Telegram voice messages automatically

how to

dependencies

1. connect rtl-sdr (arch wiki)
2. install GQRX via package manager
3. install project deps with pipenv install

sdr

1. run gqrx, tune to your radio frequency
2. select Narrow FM modulation for Baofeng radios
3. press A to set squelch automatically

now press TX button on your radio, say something, check the sound quality, tune other settings (audio gain, agc?) as needed. you should clearly hear yourself, but ZERO sound should be played when you are NOT transmitting, it's essential for the script to work. adjust the squelch.

rx.py

1. copy example.env to .env, edit the file to fill telegram token and chat id. then:
2. run the script:

   pipenv shell
   source .env
   python3 ./rx.py
   

3. • open pavucontrol or similar audio mixer
   • go to recording tab
   • change rx.py recording device to "MONITOR of system audio", so that the script listens to the output, not the microphone.
4. now voice messages will be forwarded to telegram chat. enjoy.

license

MIT