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You do not need a special tnc to do aprs!
- Most FM radios have the functionality to feed in an external microphone signal and a remote PTT. This is required for handsets.
- A free software TNC (like SoundModem) can generate APRS tones straight to audio, and signal an RS-232 device (think Arduino/Raspberry Pi) for PTT
- This audio can be sent to the radio with a PTT signal to transmit APRS packets.
- SoundModem also support decoding of APRS audio from the radio’s TRS jack.