Kenwood TS-140S Instruction Manual

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The antenna to be used should first be checked witha dip meter to insure that it is designed for youroperating band, then the impedance matchingshould be checked with an SWR meter. (Fig. 8-3)The VSWR should preferably be less than 1.5:1 forsatisfactory operation. For antenna adjustment referto the antenna instruction manual.tAdjust length(4) Antenna matchingIn general, mobile antennas have a lower impedancethan the 50-ohm coaxial cable used to feed them,resulting in a mismatch between the antenna and thecoax. Such trouble can be eliminated by using anantenna tuner between the transceiver and the coax-ial cable.¢ Matching circuit examplesBumper AntennagroundGrid Dip meterDisconnectOUTPUT Coaxial cableINPUT. OUTPUToO o —oFig. 8-3 Adjusting Antenna Resonance8-2. MOBILE OPERATION8-2-1. InstallationRoute battery and ANTENNA leads away from allhigh voltage secondary circuits to prevent ignitionnoise interference.Loading coil _Antenna bracket must have To antenna terminalgood metal to metal contactAntennaBumper mounting =precket SinceanHF antennaislargeand heavy,itmustbeinstalled towith-stand high wind stress.Pass coaxial cablethrough the drain hole.Example of (power cord) wiring Fig. 8-441

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