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AhaBulb: Stuff Everyone Should Know · ahabulb.com/ham-simplex-meaning

What do hams call transmitting and receiving on the same frequency?

Simplex.

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  1. Simplex ✔
  2. Full duplex
  3. Multiplex

Why: Simplex means both stations talk and listen on one frequency, without a repeater. A repeater receives on one frequency and transmits on another.

Huh, didn't know that: Band plans set aside simplex channels so nearby stations can talk without tying up a repeater.

The dad joke
Why do hams like simplex? It keeps things simple.
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References

Answer: Simplex. Simplex means both stations talk and listen on one frequency, without a repeater. A repeater receives on one frequency and transmits on another.

  1. ARRL: Find a High Spot for VHF www.arrl.org/find-a-high-spot-for-vhf
    both operators take turns communicating directly on the same frequency (without a repeater or other device between them)
    Checked 2026-10-09.

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