What control should be adjusted to reduce noise while the receiver is on standby?

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Prepare for the NTC Restricted Radiotelephone Operator’s Certificate (RROC) - Aircraft Test. Study with flashcards and multiple-choice questions, each with hints and explanations. Ensure success on your examination!

Multiple Choice

What control should be adjusted to reduce noise while the receiver is on standby?

Explanation:
Squelch is used to silence the receiver output when no strong signal is present. By setting a threshold, the audio stays quiet during standby so you don’t hear hiss or background noise, and it only comes through when a valid transmission exceeds that threshold. Volume would just change overall loudness, tone would alter the audio quality, and a filter changes the passband; none of those reliably suppress idle noise the way squelch does.

Squelch is used to silence the receiver output when no strong signal is present. By setting a threshold, the audio stays quiet during standby so you don’t hear hiss or background noise, and it only comes through when a valid transmission exceeds that threshold. Volume would just change overall loudness, tone would alter the audio quality, and a filter changes the passband; none of those reliably suppress idle noise the way squelch does.

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