Technician exam question T2B13
Subelement T2, OPERATING PROCEDURES· Group T2B
T2B13
What is the purpose of a squelch function?
- A.Reduce a CW transmitter's key clicks
- B.Mute the receiver audio when a signal is not present (correct answer)
- C.Eliminate parasitic oscillations in an RF amplifier
- D.Reduce interference from impulse noise
WhyA squelch function mutes the receiver audio when a signal isn't present. Squelch mutes a receiver's audio output whenever no signal strong enough to be real is present, so you hear silence instead of constant background hiss between transmissions, answer B. It has no effect on a CW transmitter's key clicks (A), on parasitic oscillations in an amplifier (C), or specifically on impulse noise (D), those are unrelated transmitter and interference issues.
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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