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.
Look this up in Pocket Elmer, along with 100 more
Related words
- FT8 — A weak-signal digital mode.
- Offset — The gap between transmit and receive frequency.
- Simplex vs duplex — One frequency versus two.
- Band — A range of frequencies set aside for a purpose.
- SSB — Single Sideband. HF voice.
- Watts — Transmit power.
- SSTV — Slow-Scan Television.
- K index — How disturbed the earth's magnetic field is.