Field Guide · protocol

Also known as: System Fusion, Yaesu System Fusion, YSF, Fusion

System Fusion (Yaesu System Fusion, YSF) is Yaesu’s amateur digital-voice system, using C4FM modulation and an AMBE-family vocoder. It is notable for automatically mixing digital and analog users on the same repeater.1

radio repeater internetWIRES-X rooms C4FM
System Fusion (YSF) uses C4FM and can bridge analog and digital users, linked via WIRES-X.

Overview

Fusion repeaters can operate in modes that bridge analog FM and C4FM digital, smoothing the transition for clubs. The WIRES-X network links Fusion repeaters and “rooms” over the internet.

Technical characteristics

Property Value
Access FDMA
Modulation C4FM
Vocoder AMBE family
Modes Digital voice, data, analog FM mix

History

Introduced by Yaesu in the mid-2010s as its entry into amateur digital voice, competing with D-STAR and amateur DMR.1

Deployment

Amateur radio, via Fusion repeaters, hotspots, and WIRES-X rooms.

Decoding it with GopherTrunk

YSF shares C4FM modulation with P25 Phase 1; see Status for GopherTrunk’s coverage.

Sources

  1. System Fusion — Wikipedia, for Yaesu’s amateur C4FM digital-voice system, its analog/digital mixing, and WIRES-X linking. ↩ ↩2

See also

Learn it step by step

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