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
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- Frequency — How fast a radio wave oscillates.
- APRS — Automatic Packet Reporting System.
- Propagation — How your signal travels.
- FT8 — A weak-signal digital mode.
- Wavelength — The physical length of one radio wave.
- K index — How disturbed the earth's magnetic field is.
- Simplex vs duplex — One frequency versus two.