RTTY — Radio Teletype.
An older digital mode using shifting tones. Still popular in contests.
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Related words
- APRS — Automatic Packet Reporting System.
- Ionosphere — The layer that bounces HF signals back to earth.
- Simplex vs duplex — One frequency versus two.
- FM — Frequency Modulation. VHF and UHF voice.
- CW — Continuous Wave. Morse code.
- Watts — Transmit power.
- Solar flux — A number that tracks solar activity.
- K index — How disturbed the earth's magnetic field is.