Technician exam question T2B06
Subelement T2, OPERATING PROCEDURES· Group T2B
What type of signaling to a repeater uses two simultaneous audio tones?
- A.DTMF (correct answer)
- B.CTCSS
- C.GMRS
- D.D-STAR
WhyDTMF signaling to a repeater uses two simultaneous audio tones. DTMF (Dual-Tone Multi-Frequency), the same tone system used for landline touch-tone dialing, sends each keypress as two simultaneous audio tones, one from a low-frequency group and one from a high-frequency group, answer A. CTCSS (B) uses a single continuous sub-audible tone rather than paired tones, and GMRS (C) and D-STAR (D) are radio services/modes, not signaling methods.
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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