, {HEAD ~ transmitting/receiving signals} are processed having {TAIL ~ a first and second transmitting/receiving frequency}, the second transmitting/receiving frequency being approximately twice the first transmitting/receiving frequency 
, { HEAD ~ transmitting / receiving signals } are processed having { TAIL ~ a first and second transmitting / receiving frequency } , the second transmitting / receiving frequency being approximately twice the first transmitting / receiving frequency
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH