HF/50MHz 10W Automatic Antenna Tuner.
The FC-80 is a 10W HF/6M light and thin automatic antenna tuner unit that is attached to the rear of the FTX-1Field head unit using the supplied spacer that clips over the SBR-52Li battery. It is connected to the radio using a short BNC Coax lead and data cable (both supplied) that powers and controls the ATU. Your PL-259 Antenna Coax connects to the SO-239 socket.
The SCF-1 Fan unit or the SBR-52Li battery can be combined with the FC-80 but not both.