SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-ctcss-tone

What is the sub-audible tone sent with your voice to open a repeater's squelch called?

CTCSS, a sub-audible tone under your voice.

  1. DTMF
  2. Carrier squelch
  3. CTCSS ✔

Why: CTCSS is a low tone sent under your voice. The repeater only opens when it hears the right tone, which keeps out unwanted signals.

Huh, didn't know that: CTCSS stands for Continuous Tone-Coded Squelch System.

The dad joke
The repeater would not let me in. I guess I had the wrong tone.
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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

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