FM (Fre­quen­cy Mod­u­la­tion) is the voice mode of choice for local VHF / UHF oper­a­tions, fixed or mobile, sim­plex or repeater based. It offers good per­for­mance with sim­ple equip­ment require­ments. The audio sig­nal con­trols (mod­u­lates) the fre­quen­cy of the trans­mit­ter over a small range.

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