Simplex vs duplex — One frequency versus two.
Simplex transmits and receives on the same frequency. Repeaters are duplex — they listen on one frequency and transmit on another, which is what the offset in your radio is for.
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Related words
- FT8 — A weak-signal digital mode.
- Gray line — The band of twilight moving around the earth.
- RTTY — Radio Teletype.
- Solar flux — A number that tracks solar activity.
- Frequency — How fast a radio wave oscillates.
- Propagation — How your signal travels.
- APRS — Automatic Packet Reporting System.
- Offset — The gap between transmit and receive frequency.