Kenwood TM-621A Instruction Manual

Also see for TM-621A: Instruction manual Instruction manual

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 capacityThe power system of a motor vehicle is comprised of a bat-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,care should be exercised so the power system is notoverloaded. When using the transciever, the followingpoints should be observed from the viewpoint of batterymaintenance:(a) Turn the transceiver OFF when the lights, heater,wipers and other high-draw accessories are used.(b) Avoid transceiver operation when the engine is notrunning.(c) If necessary, use an ammeter and/or a voltmeter tomonitor battery condition.39

/ 39

Related manuals for Kenwood TM-621A