Seems like overkill? An Arduino should have all the processing power needed for a KISS TNC.
@Sabex this is going to be packet radio with dialup.
It's hopefully going to be a shell people can log into too, so yes, still overkill.
Yeah I started out using VOX but then used one of the raspi lines to drive a 2N2222 to switch the PTT. I always fancied using a relay for the click-clunk but never got around to it.
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