Technician exam question T2B02
Subelement T2, OPERATING PROCEDURES· Group T2B
What term describes the use of a sub-audible tone transmitted along with normal voice audio to open the squelch of a receiver?
- A.Carrier squelch
- B.Tone burst
- C.DTMF
- D.CTCSS (correct answer)
WhyCTCSS is the term for a sub-audible tone transmitted along with normal voice audio to open a receiver's squelch. CTCSS (Continuous Tone-Coded Squelch System) transmits a steady sub-audible tone underneath your voice audio; the receiver only opens its squelch when it detects that specific tone, which is how a repeater screens out unwanted signals on the same frequency, answer D. Carrier squelch (A) opens on any signal regardless of tone, tone burst (B) is a single brief tone rather than a continuous one, and DTMF (C) is the multi-tone system used for touch-tone-style signaling, not continuous sub-audible squelch control.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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