HeiL FS-3 FS3 Original Foot Switch for PTT, Single Channel Heil Genesis Series FS-3 Single Channel Foot Switch The FS 3 is a single channel foot switch to control the transmit/receive (PTT) function of an amateur radio transceiver. An 8' shielded cable is terminated with a commercial 1/4" plug connects into the Heil CC-1 and AD-1 cable system. The hinge bar is a solid chrome rod running through the top and bottom plates eliminating threaded screws that usually work loose. The hinge bar is secured with 'C' fasteners. An 8' shielded cable is terminated with a commercial 1/4" plug connects into the Heil CC-1 and AD-1 cable system. Ham Radio Use