ARRL Technician Practice Exam

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Which of the following describes the muting of receiver audio controlled solely by the presence or absence of an RF signal?

  1. CTCSS

  2. Carrier squelch

  3. Voice-operated switch

  4. Automatic gain control

The correct answer is: Carrier squelch

The correct answer is the method known as carrier squelch. Carrier squelch is a technique used in radio receivers to mute the audio output. It operates by monitoring the presence of a carrier signal at the input of the receiver. When no RF signal is detected—meaning there is no continuous carrier signal—the squelch circuit keeps the audio output muted, essentially eliminating extraneous noise. When a valid

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