WB8WGA?s Simple Inexpensive TNC
A terminal node controller (TNC) is a device used by amateur radio operators to participate in AX.25 packet radio networks. It is similar in function to the Packet Assembler/Disassemblers used on X.25 networks, with the addition of a modem to convert baseband digital signals to audio tones.This TNC implements only parts of the AX.25 protocol, to encode and decode Unnumbered Information frames, used in the APRS system.
   WB8WGA’s Simple Inexpensive TNC
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