FM — Frequency Modulation. VHF and UHF voice.
What repeaters and handhelds use. Clean audio, but it needs a strong signal — FM either works well or drops out entirely.
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Related words
- Band — A range of frequencies set aside for a purpose.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- SSTV — Slow-Scan Television.
- Frequency — How fast a radio wave oscillates.
- APRS — Automatic Packet Reporting System.
- SSB — Single Sideband. HF voice.
- Sporadic E — Sudden short-lived openings.
- Ionosphere — The layer that bounces HF signals back to earth.