RTTY — Radio Teletype.
An older digital mode using shifting tones. Still popular in contests.
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Related words
- SSTV — Slow-Scan Television.
- Gray line — The band of twilight moving around the earth.
- Sporadic E — Sudden short-lived openings.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- Solar flux — A number that tracks solar activity.
- APRS — Automatic Packet Reporting System.
- Band — A range of frequencies set aside for a purpose.
- SWR — Standing Wave Ratio.