a decoder coupled to the receiver for recovering {TAIL ~ the selective call message} from {HEAD ~ the demodulated signal} 
a decoder coupled to the receiver for recovering { TAIL ~ the selective call message } from { HEAD ~ the demodulated signal }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD