13Rear Panel ConnectorsFT-891 Operating ManualEXT SPKR JackThis 3.5-mm, 2-pin jack provides variable audio output for an external speaker. Theaudio output impedance at this jack is 4 Ω ~ 16 Ω and the level varies according to thesetting of the front panel’s AF control.ANT Antenna JackConnect your HF and/or 50 MHz antenna’s 50 Ω coaxial cable to this M-type (“SO-239”) connector.DC IN JackThis is the DC power supply connection for the transceiver. Use the supplied DC cableto connect directly to a DC power supply, which must be capable of supplying at least25 A @13.8 VDC.