Mute the receiver audio when a signal is not present✓الإجابة الصحيحة
Eliminate parasitic oscillations in an RF amplifier
Reduce interference from impulse noise
الشرح
Squelch mutes the receiver's audio output until a signal of sufficient strength or the correct access tone is present, so you are not listening to noise between transmissions. It acts on receive audio and does nothing to the transmitter.