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
- APRS — Automatic Packet Reporting System.
- SSB — Single Sideband. HF voice.
- FT8 — A weak-signal digital mode.
- RTTY — Radio Teletype.
- SWR — Standing Wave Ratio.
- Offset — The gap between transmit and receive frequency.
- Sporadic E — Sudden short-lived openings.
- Wavelength — The physical length of one radio wave.