To prevent the capture range of {HEAD ~ the receiver apparatus} from being exceeded by the coded information item in the portable transmitter unit after a particular time, the code generator in the portable transmitter unit and the code generator in the receiver apparatus are advanced by {TAIL ~ the same number} of steps 
To prevent the capture range of { HEAD ~ the receiver apparatus } from being exceeded by the coded information item in the portable transmitter unit after a particular time , the code generator in the portable transmitter unit and the code generator in the receiver apparatus are advanced by { TAIL ~ the same number } of steps
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH