Fast Simple QSO (FSQ) is an amateur radio digital differential frequency modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015. FSQ is used primarily on HF on fixed frequency channels. VHF adaptions of FSQ are also supported using VHF FM. The FSQ modulation, coding and FSQCall protocol are publicly disclosed and described, and the software is open source. FSQ works well under NVIS (a propagation mode for short-medium distance communications) and sunrise/sunset conditions on the lower bands, and also works well for short skip and grey-line on higher bands.
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