MFSK: Digital Mode for Amateur Radio

Understanding MFSK Communication

Austin
Reviewed by • Digital Modes & Software Editor February 2026

MFSK (Minimum Shift Keying) is a digital communication mode widely used in amateur radio. It employs frequency shift keying to transmit data, making it effective for weak signal propagation. MFSK is particularly valued for its ability to maintain readability in noisy environments, enhancing communication reliability among operators.

Key concepts related to MFSK include M-ary FSK, phase continuous tones, and convolutional coding for forward error correction (FEC). Understanding these principles is essential for optimizing MFSK operations and achieving successful digital communications in amateur radio.

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