What is the purpose of a squelch function?

• A. To amplify weak signals
• B. To mute the receiver audio when a signal is not present
• C. To adjust the transmission power
• D. To filter out noise from received signals

Answer: (B)

The squelch function serves a vital role in the operation of a radio receiver by muting the audio output when no signal is present. This reduces background noise and static that would otherwise become distracting. When the receiver detects a signal above a certain threshold, the squelch circuit allows the audio to pass through, enabling the operator to hear the incoming communication clearly.

By muting the audio during silence or weak signals, the squelch function ensures that users only hear relevant communications, enhancing overall efficiency in using the radio. This is particularly important in busy radio environments where constant noise can make it challenging to discern meaningful transmissions.