Kenwood TM-621A Instruction Manual

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8-2. MOBILE INSTALLATION HINTS8-2-1. Noise ReductionIn motor vehicles, noise is generated by mainly the ignitionsystem. Other sources of noise include the wiper andheater motors.It is imperative that some preventive measures be taken toreduce the noise to the lowest possible level.(a) Antenna location selectionSince ignition noise is generated by the vehiclesengine, the antenna must be installed as far from theengine as possible.(b) BondingThe component parts of motor vehicles, such as theengine, transmission, muffler system, accelerator,etc., are coupled to one another at DC and low fre-quencies, but are isolated at high frequencies. By con-necting these parts using heavy, braided groundstraps, ignition noise can be reduced. This connectionis called ‘‘bonding’’.(c) Use ignition suppressor cable or suppressor sparkplugsNoise can be reduced by using spark plugs with inter-nal resistors, or resistive suppressor ignition cable.8-2-2. Battery capacityThepower systemofamotorvehicleiscomprisedofabat-tery and an alternator (which generates power while theengine is running) to supply current to the various loads orto charge the battery.Since the transceiver draws high current during transmit,careshould be exercisedsothepower systemisnotoverloaded.Whenusingthe transciever, thefollowingpointsshould beobservedfromtheviewpointofbatterymaintenance:(a)TurnthetransceiverOFF whenthelights,heater,wipers andotherhigh-drawaccessoriesareused.(b)Avoidtransceiver operationwhentheengineisnotrunning..(c) If necessary, use an ammeter and/or a voltmeter tomonitor battery condition.39

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