A squelch detecting circuit comprises {TAIL ~ a narrow bandpass filter} for obtaining, as a filtered signal, {HEAD ~ a desired IF carrier frequency signal} 
A squelch detecting circuit comprises { TAIL ~ a narrow bandpass filter } for obtaining , as a filtered signal , { HEAD ~ a desired IF carrier frequency signal }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD