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
- Sporadic E — Sudden short-lived openings.
- K index — How disturbed the earth's magnetic field is.
- Wavelength — The physical length of one radio wave.
- RTTY — Radio Teletype.
- Gray line — The band of twilight moving around the earth.
- Propagation — How your signal travels.
- Offset — The gap between transmit and receive frequency.
- CW — Continuous Wave. Morse code.