SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-simplex-meaning

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

Simplex.

  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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Sources

  1. NCVEC 2026-2030 Technician Question Pool (Element 2), errata Feb 19, 2026 https://www.ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf

Test yourself in the game

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That's stuff everyone should know.