Cheap AFSK terminal node controller

Robots shared his cheap AFSK terminal node controller design. It’s a cheap alternative to the commercial TNCs, based on a STM32VL discovery board and a small adapter board.

Audio Frequency Shift Keying is an old, low speed packed based radio standard, now primarily used in HAM radios for APRS communication.

What is needed for APRS is a host computer, radio, and a terminal node controller. While the PC and radio are common, and relatively cheap, the TNCs are quite expensive.

Via the forum.

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