I can't tell from the description how the Pi3 is connected to the radio.? There has to be something in between that converts from the Pi3's digital I/O into the radio's audio.? Plus handle PTT.
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That function is usually performed by a soundcard (e.g., Signalink).? It could also be a TNC device, but that would be limited to a single digital mode (e.g., Packet).
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Which soundcard do you have?? How are the devices connected?
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