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