Sporadic E — Sudden short-lived openings.
Patches of intense ionization that make 6 and 10 meters open without warning, mostly in early summer. It is why 6 meters is called the Magic Band.
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Related words
- K index — How disturbed the earth's magnetic field is.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- Frequency — How fast a radio wave oscillates.
- CW — Continuous Wave. Morse code.
- Propagation — How your signal travels.
- Band — A range of frequencies set aside for a purpose.
- Offset — The gap between transmit and receive frequency.
- Ionosphere — The layer that bounces HF signals back to earth.