The Amateur raido Winlink email backend supports several RF protocols depending on the band and conditions. The ARDOP protocol/modem is ideal for HF bands and a viable alternative to VARA/HF or PACTOR, plus it's open source and free, advancing the art of amateur radio. Get ARDOP https://www.cantab.net/users/john.wiseman/Documents/ARDOPC.html Patched version for Linux kernel 5.15 (Ubuntu, Unpatched Bullseye, not needed for Bookworm) https://craiger.org/craiger/ardopc.arm-2 https://craiger.org/craiger/ardopc.x86-2
