Uniden PRO 640XL owner manual Mobile Installation, Mobile Antenna, Negative Ground System

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 self-tappingscrews which are provided.

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 SO-ohm transmission line to the radiating element. We recommend that you use a SWR meter when

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 "-"battery terminal being connected to the vehicle motor block, but ifyou cannot determine the polarity of your vehicle, consult your vehicle dealer for information.

NOTE: This radio may be installed and used in any 12-volt DC negative or positive ground system.

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 "-" terminal of the battery.

POSITIVE GROUND SYSTEM

If you are operating on a positive ground system, connect the black DC power cord from the radio to the negative "-"battery terminal or other convenient point

and connect the red power lead to the chassis orvehicle frame, or the positive "+" terminal of the battery.

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