Among the many digital modes, aka digimodes, there is one that I find really nice. If you saw the title of this post you will have understood which one I’m going to talk about.
MFSK, acronym of “multi-frequency shift keyed”, is a family of digital modes that dates back to the 1960’s but is still interesting because it transmits data with an error correction code (FEC) and it also allows sending images!
F1RUM