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
- RTTY — Radio Teletype.
- Frequency — How fast a radio wave oscillates.
- Wavelength — The physical length of one radio wave.
- Offset — The gap between transmit and receive frequency.
- Gray line — The band of twilight moving around the earth.
- FT8 — A weak-signal digital mode.
- SSTV — Slow-Scan Television.
- Sporadic E — Sudden short-lived openings.