K index — How disturbed the earth's magnetic field is.
Zero to nine. Under 3 is quiet and good. Five and above means a geomagnetic storm is degrading HF, especially on paths toward the poles.
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Related words
- SSTV — Slow-Scan Television.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- Propagation — How your signal travels.
- RTTY — Radio Teletype.
- Watts — Transmit power.
- SWR — Standing Wave Ratio.
- Gray line — The band of twilight moving around the earth.
- CW — Continuous Wave. Morse code.