The sample hold pulse signal {HEAD ~ SH1} turns on switch 170 allowing analog data from {TAIL ~ antenna} 32 to pass through the switch 170 to the resistor R16 and capacitor C16 which form sample/hold circuit 171 
The sample hold pulse signal { HEAD ~ SH1 } turns on switch 170 allowing analog data from { TAIL ~ antenna } 32 to pass through the switch 170 to the resistor R16 and capacitor C16 which form sample / hold circuit 171
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH