Discussion
What is the function of a squelch circuit?
Answer: B
Squelch silences the receiver until the signal exceeds a threshold, so the operator is not subjected to noise between transmissions. It is essential in any receiver left monitoring a quiet channel. Modulation depth is a transmitter matter. Image rejection is provided by preselection. And oscillator stability comes from the circuit design or a control loop. Squelch is a convenience rather than a performance feature, but its absence makes a radio unusable for monitoring.
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