2INSTALLATION AND CONNECTIONS1234567891011121314151617181920212-3Connecting an external DC power supplyConfirm that the transceiver is OFF before connectingthe DC power cable.L We recommend using Icom’s optional PS-126(DC 13.8 V/25 A) power supply.L When connecting a non-Icom DC power cable, thetransceiver needs:• DC 13.8 V (Capacity: At least 21 Amps)• a power supply with an over current protective line andlow voltage fluctuation or ripple._+PS-126Non-Icom DC power supplyPS-126AC cable DC power cableIC-7300qwWhen disconnecting, firmlypush down the locking taband then pull the connectorout of the socket.GNDSupplied DCpower cableBlackRedConnecting the antenna tunerThe AH-4 automatic antenna tuner matches theIC-7300 to the optional AH-2b or a long wire antennamore than 7 m/23 ft long (between 3.5 MHz and 50MHz).NOTE: Before connecting, be sure to turn OFF thetransceiver power.L See the AH-4 instruction manual for installation andconnection details.GNDAH-4GND[ANT]IC-7300[TUNER]HF band long wireantennaOr to an optional AH-2bControl cableFusesCAUTION: DO NOT touch the cooling fan on the rear panelof the transceiver after transmitting continuously for longperiods of time. The transceiver becomes extremely hot.