UZ7HO's SoundModem recently added FX.25 also.

On Sunday, May 31, 2020, 10:55:49 AM EDT, Tadd KA2DEW in NC via groups.io <tadd@...> wrote:

FX.25 is a wrapper around AX.25 packets. The Packet generated by the FX.25 compatible TNC send an actual AX.25 packet with supplemental information such that the AX.25 packet is not molested. ?An FX.25 compatible TNC receiver will see the FX.25 extra material and will make use of that material to recover the AX.25 packet if bit-errors have occurred, but otherwise it gets the same information the AX.25 packet would have had. ?If a TNC not capable of understanding the FX.25 material hears the packet, it will only pay attention to the AX.25 part and will still decode it.?

The FX.25 part is created by the TNC or TNC-program. ?G8BPQ doesn’t know or care about the difference between FX.25 and AX.25. ?It only gets the KISS frame generated from the AX.25 details, and it generates KISS transmissions which the TNC will interpret into AX.25 or FX.25+AX.25. ?

Direwolf is the only FX.25-aware TNC [as an emulator of TNCs] that I know about. ?

Tadd - KA2DEW

On May 31, 2020, at 10:44 AM, Vincent <panserv@...> wrote:

a diff