CW — Continuous Wave. Morse code.
Still enormously popular, because a narrow CW signal gets through when voice cannot. No longer required for any US license.
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Related words
- SWR — Standing Wave Ratio.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- FT8 — A weak-signal digital mode.
- Band — A range of frequencies set aside for a purpose.
- SSB — Single Sideband. HF voice.
- Wavelength — The physical length of one radio wave.
- K index — How disturbed the earth's magnetic field is.
- Sporadic E — Sudden short-lived openings.