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