Wavelength — The physical length of one radio wave.
Why bands have names like 20 meters. Divide 300 by the frequency in MHz to get the wavelength in meters — and antenna sizes follow directly from it.
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Related words
- Simplex vs duplex — One frequency versus two.
- SSB — Single Sideband. HF voice.
- Offset — The gap between transmit and receive frequency.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- Watts — Transmit power.
- APRS — Automatic Packet Reporting System.
- Ionosphere — The layer that bounces HF signals back to earth.
- K index — How disturbed the earth's magnetic field is.