System Fusion (C4FM) digital voice

Yaesu's digital voice system for hams.

ModeSystem Fusion

FamilyDigital voice

Audio exampleComing

What does it sound like?

Plate 65Digital voice

A harsh, buzzing digital sound.

Field marks4-level FSK (C4FM)Ham VHF/UHF

Who uses it?

Amateur radio operators.

Where and when can I hear it?

Ham VHF/UHF repeaters.

Easily confused with

D-STAR digital voice: D-STAR sounds smoother (GMSK)
DMR digital voice: DMR has a pulsing edge