M
Mason AndersonJul 30, 2025
What to do if my Garmin Apollo SL40 Transceiver does not transmit?
- Ddavid00Jul 30, 2025
If your Garmin Transceiver unit isn't transmitting, it could be due to several reasons. First, ensure the TxKey (microphone key) input is properly connected and pulled low for transmitting. Also, confirm that you haven't selected a weather channel, as the unit won't transmit on those frequencies. Finally, check that the input supply voltage is greater than 9 volts DC.