Ionosphere — The layer that bounces HF signals back to earth.
Charged by the sun, which is why HF conditions change between day and night and with the eleven-year solar cycle.
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Related words
- Frequency — How fast a radio wave oscillates.
- Watts — Transmit power.
- Offset — The gap between transmit and receive frequency.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- Gray line — The band of twilight moving around the earth.
- RTTY — Radio Teletype.
- Band — A range of frequencies set aside for a purpose.
- SSB — Single Sideband. HF voice.