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.
- APRS — Automatic Packet Reporting System.
- Simplex vs duplex — One frequency versus two.
- Offset — The gap between transmit and receive frequency.
- Solar flux — A number that tracks solar activity.
- CW — Continuous Wave. Morse code.
- Gray line — The band of twilight moving around the earth.
- Sporadic E — Sudden short-lived openings.