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FT4 - new protocol for contesting

“Like FT8, it uses fixed-length transmissions, structured messages with
formats optimized for minimal QSOs, and strong forward error correction. T/R
sequences are 6 seconds long, so FT4 is 2.5 × faster than FT8 and about the same
speed as RTTY for radio contesting.”

http://physics.princeton.edu/pulsar/k1jt/FT4_Protocol.pdf