at least one impedance control circuit, each of which is connected to an output end of each carrier amplifier for controlling {HEAD ~ a load line impedance} of said {TAIL ~ each carrier} amplifier 
of
at least one impedance control circuit , each of which is connected to an output end of each carrier amplifier for controlling { HEAD ~ a load line impedance } of said { TAIL ~ each carrier } amplifier
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH