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
- FT8 — A weak-signal digital mode.
- Watts — Transmit power.
- FM — Frequency Modulation. VHF and UHF voice.
- Sporadic E — Sudden short-lived openings.
- CW — Continuous Wave. Morse code.
- RTTY — Radio Teletype.
- Simplex vs duplex — One frequency versus two.
- SSTV — Slow-Scan Television.