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MFSK works by using comparatively narrow tone spacing. This helps to achieve significant data rates for a given bandwidth. For example, 64 bps in a signal bandwidth of 316 Hz is common.
The first MFSK mode was MFSK16, which was designed by Murray ZL1BPU. MFSK16 was first coded by Nino IZ8BLY, and was released in 1999. It featured full-time error correction and was built for long-path DX.The benefits of MFSK include: