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.
- Simplex vs duplex — One frequency versus two.
- Watts — Transmit power.
- SWR — Standing Wave Ratio.
- K index — How disturbed the earth's magnetic field is.
- Offset — The gap between transmit and receive frequency.
- SSB — Single Sideband. HF voice.
- Ionosphere — The layer that bounces HF signals back to earth.