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All System Fusion radios, (FTM-400DR mobile, FT1D and FT2D) radios can operate in fixed FM mode, DN (Digital Narrow @ 6.25 KHz ) or VW (Voice Wide 12.5 KHz signal).===C4FM FDMA===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.