Yaesu FT-991 Operating Manual

Also see for FT-991: Manual Manual Operating manual Reference book Instruction manual

Page 8FT-991 O PERA T ING M ANUALconnection oF AntennA And power cAbleSPlease follow the outline in the illustration regarding the proper connection of antenna coaxial cables, as well as the DCpower cable. The DC power connector for the FT-991 must only be connected to a DC source providing 13.8 Volts DC (±10%), and capable of at least 23 Amperes of current. Always observe proper polarity when making DC connection:The RED DC power lead connects to the Positive (+) DC terminal.The BLACK DC power lead connects to the Negative (–) DC terminal.We recommend the use of the FP-1030A (USA market only) AC Power Supply. Other models of power supplies maybe used with the FT-991, but the 13.8 VDC input voltage, 23 Ampere current capability, and DC cable polarity guide-lines described above must be strictly followed.Note that other manufacturers may use the same type of DC power connections as does your FT-991 transceiver, how-ever, the wiring configuration may be different from that specified for your transceiver. Serious damage can be caused ifimproper DC connections are made; consult with a qualified service technician when in doubt.The 100 V RF voltage (@100 W/50-ohm) is applied to the TX RF section of the transceiver while transmitting.Do not touch the TX RF section absolutely while transmitting.Permanent damage can result when improper supply voltage, or reverse-polarity voltage, is applied to the FT-991. The Limited Warranty on this transceiver does not cover damage caused by application of AC voltage, re-verse polarity DC, or DC voltage outside the specified range of 13.8 V ±10 %. When replacing fuses, be certain to use afuse of the proper rating. The FT-991 requires a 25 A blade fuse.A dvice : Do not position the FT-991 in a location with direct exposure to sunshine. Do not position the FT-991 in a location exposed to dust and/or high humidity. Ensure adequate ventilation around the FT-991, to prevent heat build-up and possible reduction of performance dueto high heat. Do not install the FT-991 on an unstable desk or table. Do not place in a location where objects may fall onto it from above. To minimize the possibility of interference to home entertainment devices, take all precautionary steps includingseparation of TV/FM antennas from Amateur transmitting antennas to the greatest extent possible, and keep trans-mitting coaxial cables separated from cables connected to home entertainment devices. Ensure that the DC power cord is not subject to undue stress or bending, which could damage the cable or cause it tobe accidentally unplugged from the rear panel DC IN jack. Be certain to install your transmitting antenna(s) so they cannot possibly come in contact with TV/FM radio or otherantennas, or with power or telephone lines.insTallaTion and inTerConneCTionsC h e c k t h e D C v o l t -age and current rating(+13.8 V, 23 A) of the powersupply before connecting to thetransceiver.To prevent damage fromlightning, atmospheric elec-tricity, electrical shock etc., pleaseprovide a good earth ground.U s e a s h o r t ,t h i c k , b r a i d e dc a b l e t o c o n -nect your stationequipment to theburied ground rod (or alternative earthground system).