Solar flux — A number that tracks solar activity.
Higher numbers mean the upper bands are more likely to be open. Below about 90 the high bands struggle; above 130 they come alive.
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Related words
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- Band — A range of frequencies set aside for a purpose.
- Ionosphere — The layer that bounces HF signals back to earth.
- SSB — Single Sideband. HF voice.
- FT8 — A weak-signal digital mode.
- SWR — Standing Wave Ratio.
- Frequency — How fast a radio wave oscillates.
- Sporadic E — Sudden short-lived openings.