Discussion
Why is a squelch or muting circuit fitted?
Answer: D
Squelch mutes the audio while no carrier is received, so an operator is not subjected to full-gain noise between transmissions. Limiting audio power is a different protective function. The image is a front-end matter. And oscillator stability is unrelated. The circuit is a good example of a feature that improves nothing measurable about the receiver and a great deal about using it, which is why every practical set has one.
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