[44net] TNC-Pi

Beyond what others have mentioned like the TNC-Pi (nice kit), using a $7 USB soundcard and Direwolf will provide superior decodes.

Yes, I wonder why on earth they use a hardware AFSK modem chip in that design... I can see a place for an adapter board that provides PTT keying, possibly isolated audio interface, etc for the Pi, but it should always just do A/D and D/A conversion of the audio and leave the processing to software. That works so much better, and it enables the development of alternative modem designs without having to change the hardware every time.

Rob