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System Fusion C4FM by Yaesu is the current implementation of Yaesu's digital radio for ham. System Fusion C4FM by Yaesu is the current implementation of Yaesu's digital radio for ham. The 12.5 kHz channel spacing in using the C4FM FDMA digital modulation mode allows high-speed data communication, voice communication and error correction. The data transfer speed is 9.6 kbps.