a receiver mixer connected directly to {HEAD ~ an output} of {TAIL ~ the circulator interface} to the transmitter and antenna 
a receiver mixer connected directly to { HEAD ~ an output } of { TAIL ~ the circulator interface } to the transmitter and antenna
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH