Yaesu FT-897 Operating Manual

Also see for FT-897: Manual Brochure & specs Operating manual Technical supplement Service manual

Yaesu FT-897 Operating Manual Manual pdf 6 page image

Page 4 FT-897 OPERATING MANUALPOWER C ONNECTIONSThe FT-897 is designed use from (1) an external DC power source, (2) internal battery (requires optional FNB-78 Ni-MHbattery pack), or (3) AC power source (requires optional FP-30 Internal AC Power Supply).External DC power source operationI NSTALLATIONThe DC power connector for the FT-897 must only be con-nected to a DC source providing 13.8 Volts DC (±15%),and capable of at least 22 Amperes of current. Always ob-serve proper polarity when making DC connections:The Red DC power lead connects to the Positive (+)DC terminal; and the Black DC power lead connectsto the Negative (–) DC terminal.In mobile installations, noise pickup may be minimized byconnecting the DC cable directly to your vehicle’s battery,rather than to the ignition switch or “accessory” circuitry.Direct connection to the battery also provides the best volt-age stability.Tips for Successful Mobile Installations: Before connecting the DC cable to the battery, measurethe voltage across the battery terminals with the enginerunning fast enough to show a charge. If the voltage isabove 15 Volts, the vehicle’s voltage regulator shouldbe adjusted to reduce the charging voltage to 14 Volts orlower. Route the DC cable as far away from the ignition cablesas possible. If the DC cable is not long enough, use #12 AWG (mini-mum) stranded, insulated wire to extend it. Be certain tosolder the connections at the splice securely, and pro-vide ample insulation for the soldered splice (heat shrinktubing plus black electrical tape work well). Check the battery terminal connections frequently to besure they are tight and not corroded. When operating with the vehicle turned off, or operatingfrom a stand-alone car battery (in a camp site, etc.), bemindful of the minimum operating voltage (11.73 Volts)for the FT-897. If the battery is not charged sufficientlyto maintain at least 11¾ Volts at the radio, erratic opera-tion or shut-down may occur.CautionPermanent damage can result if improper supply volt-age, or reverse-polarity voltage, is applied to the FT-897. The Limited Warranty on this transceiver does notcover damage caused by application of AC voltage, re-versed polarity DC, or DC voltage outside the specifiedrange of 13.8V ±15%. Never attempt to connect the FT-897 to a 24 Volt battery system.When replacing fuses, be certain to use a fuse of theproper rating. The FT-897 requires a 25A fast-blow fuse.