The DXZone.com Amateur Radio Internet Guide
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What is System Fusion
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https://www.dxzone.com/dx34175/what-...em-fusion.html
Operating Modes/System Fusion
System Fusion is a digital communications mode for voice and data,
including pictures. It utilizes a customized, yet open, C4FM FDMA standard.
An introduction to Yaesu System Fusion by Wireless Society of Southern Maine