{TAIL ~ The amplitude} of the output of receiver 24 is sampled by {HEAD ~ sample/hold circuit} 171 
{ TAIL ~ The amplitude } of the output of receiver 24 is sampled by { HEAD ~ sample / hold circuit } 171
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH