Yaesu FT-7900R Operating Manual

Also see for FT-7900R: Technical supplement

9FT-7900R OPERATING MANUALCabin Engine RoomÅ ÆFT-7900RBatteryRED: Positive (+)BLACK: Negative (–)Mobile Power ConnectionsTo minimize voltage drop and avoid blowing the vehicle’s fuses, connect the supplied DCpower cable directly to the battery terminals. Do not attempt to defeat or bypass the DCcable’s fuse - it is there to protect you, your transceiver, and your vehicle’s electrical system.Warning!Never apply AC power to the power cable of the FT-7900R, nor DC voltage greaterthan 15.8 Volts. When replacing the fuse, only use a 15-A fast-blow type. Failureto observe these safety precautions will void the Limited Warranty on this product. Before connecting the transceiver, check the voltage at the battery terminals while rev-ving the engine. If the voltage exceeds 15 Volts, adjust the vehicle’s voltage regulatorbefore proceeding with installation. Connect the RED power cable lead to the POSITIVE (+) battery terminal, and the BLACKpower cable lead to the NEGATIVE (–) terminal. If you need to extend the power cable,use #12 AWG or larger insulated, stranded copper wire. Solder the splice connectionscarefully, and wrap the connections thoroughly with insulating electrical tape. Before connecting the cable to the transceiver, verify the voltage and polarity of thevoltage at the transceiver end of the DC cable using a DC voltmeter. Now connect thetransceiver to the DC cable.MOBILE INSTALLATIONI NSTALLATIONMobile SpeakersThe optional MLS-100 External Speaker includes its own swivel-type mounting bracket,and is available from your Yaesu dealer.Other external speakers may be used with the FT-7900R, if they present the specified 8-Ohmimpedance and are capable of handling the 2 Watts of audio output supplied by the FT-7900R.WARNNING!Never remove the FUSE holdersfrom the DC cable.