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
- Sporadic E — Sudden short-lived openings.
- RTTY — Radio Teletype.
- Wavelength — The physical length of one radio wave.
- FT8 — A weak-signal digital mode.
- CW — Continuous Wave. Morse code.
- SWR — Standing Wave Ratio.
- Frequency — How fast a radio wave oscillates.
- CTCSS / PL tone — A sub-audible tone that opens a repeater.