Yaesu FT-847 Operating Manual

Also see for FT-847: Technical supplement Technical supplement Technical supplement Modification

Contents

7FT-847 OPERATING MANUALTips for SuccessfulMobile Installations:r Before connecting the DC cable to the battery, mea-sure the voltage across the battery terminals withthe engine running fast enough to show a charge. Ifthe voltage is above 15 Volts, the vehicle’s voltageregulator should be adjusted to reduce the charg-ing voltage to 14 Volts or lower.r Route the DC cable as far away from the ignitioncables as possible, and cut off any excess cable(from the battery end) to minimize voltage drop.r If the DC cable is not long enough, use #12 AWG(minimum) stranded, insulated wire to extend it.Be certain to solder the connections at the splicesecurely, and provide ample insulation for the sol-dered splice (heat shrink tubing plus black electri-cal tape work well).r Be sure that the POWER switch on the FT-847 isOFF when connecting the DC cable’s connectorto the rear panel 13.8VDC jack.r Be sure that the POWER switch on the FT-847 isOFF when starting your car. There initially maybe no voltage regulation, which may cause erraticoperation of your transceiver’s microprocessor.r Check the battery terminal connections frequentlyto be sure they are tight and not corroded.InstallationPOWER CONNECTIONSCautionPermanent damage can result if improper sup-ply voltage, or reverse-polarity voltage, is ap-plied to the FT-847. The Limited Warranty onthis transceiver does not cover damage causedby application of AC voltage, reversed polarityDC, or DC voltage outside the specified rangeof 13.8V ±10%.When replacing fuses, be certain to use a fuseof the proper rating. The FT-847 requires a 25Afast-blow fuse.