Mobile Installation
Plan the location of the radio and microphone bracket before starting installation. Select a location that is convenient for operation and does not interfere with the driver or passenger in the vehicle. The radio should be securely fastened to a solid surface using the mounting bracket and
MOBILE ANTENNA
Since the maximum allowable power output of the transceiver is limited by the DOT AC, the antenna
is a very important factor affecting transmission distance. It is for this reason that we strongly recommend that you install only a quality antenna in your new CB radio system. You have
purchased a superior quality transceiver.. Don'tdiminish its performance by installing an inferior antenna.
Only a properly matched antenna system will allow maximum power transfer from the
installing your antenna. Set your PRO 640XL to channel 20 and make adjustments to the antenna until the meter shows SWR = 1. Your local dealer is qualified to assist you in the selection of the
proper antenna to meet your application requirements.
For automobile installation, the whip antenna may be used with good effect. The most efficient and
practical installation is a full quarter wave whip antenna mounted on the rear deck or fender top, midway between the rear window and bumper.
A short "loaded" whip antenna is more convenient to install on your automobile, although the efficiency is less than a full quarter wave whip antenna.
For marine installation, consult your dealer for information regarding an adequate grounding system and prevention of electrolysis between fittings on the hull and water.
GROUND INFORMA nON
Most newer cars and small trucks use a negative ground system, while some older cars and some newer, larger trucks may use a positive ground system. A negative ground system isgenerally identified by the
NOTE: This radio may be installed and used in any
NEGATIVE GROUND SYSTEM
Ifyou are operating on a negative ground system, connect the red DC power cord from the radio to the positive "+" battery terminal or other convenient point and
connect the black power lead to the chassis or vehicle frame, or the negative
POSITIVE GROUND SYSTEM
If you are operating on a positive ground system, connect the black DC power cord from the radio to the negative
and connect the red power lead to the chassis orvehicle frame, or the positive "+" terminal of the battery.
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