APRS — Automatic Packet Reporting System.
Radios beacon their position and short messages, which get relayed to the internet. Useful for tracking, weather data, and messaging.
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Related words
- Wavelength — The physical length of one radio wave.
- Propagation — How your signal travels.
- Gray line — The band of twilight moving around the earth.
- Ionosphere — The layer that bounces HF signals back to earth.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.
- SWR — Standing Wave Ratio.
- RTTY — Radio Teletype.
- Offset — The gap between transmit and receive frequency.