The Yaesu FAS-1-4R Antenna switch was designed for the FL-7000 amplifier. Its purpose is for easy selection of up to 4 antennas using the antenna select buttons located on the front of the FL-7000 with the relay (FAS) remotely mounted. Hookup is a simple 4 wires attached to the rear of the FL-7000 connecting to the FAS REMOTE connector.
Each antenna has its own indicator to let the operator know which antenna is selected.
Below is a picture of a FAS-1-4R...