The phase locked loop system has a lock frequency range which decreases {HEAD ~ its width} when {TAIL ~ the level} of the input angle modulated wave is below a predetermined level 
The phase locked loop system has a lock frequency range which decreases { HEAD ~ its width } when { TAIL ~ the level } of the input angle modulated wave is below a predetermined level
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH