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The typical squelch circuit cuts off __________

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The typical squelch circuit cuts off __________

(a) An audio amplifier when the carrier is absent

(b) RF interference when the signal is weak

(c) An IF amplifier when Automatic Gain Control is maximum

(d) An IF amplifier when Automatic Gain Control is minimum

The question was posed to me in an international level competition.

I need to ask this question from Noise for SSB-SC in portion Noise of Analog Communications

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Right option is (a) An audio amplifier when the carrier is absent

The explanation: The use of squelch circuit is to suppress the audio or video output of a receiver in the absence of a sufficiently strong desired input signal.

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