Show HN: hfmodem – open-source PACTOR-3 and VARA compatible waveform generator

Category: infrastructure

Tags: ham-radio, hf-modem, pactor, vara, winlink, digital-communications, signal-processing

Score: 7.0/10 (Innovation: 8, Technical: 8, Documentation: 7, Utility: 5)

hfmodem is an ambitious open-source implementation of several HF radio modem waveforms (PACTOR-3, VARA, ARDOP, and others) for amateur radio and Winlink email. It provides a complete station stack including radio control, audio handling, and host protocols, with a strong focus on conformance testing and reproducible recordings. The project is technically deep and fills a significant gap for open-source HF digital communications, though it's currently experimental and aimed at developers.

Target audience: ham radio operators, RF/DSP engineers, Winlink users, developers interested in digital communications

Repository: https://hfmodem.ssj.lol/ · Python · AGPL-3.0 · 6 stars

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