Cobra 2010 GTL WX Instructions d'exploitation télécharger pdf (Page 7)

Section III Installation

LOCATION

Prior to beginning operation of the transceiver, a basic installation must be prepared.

Installation of the transceiver itself is a rather simple procedure.

In selecting the location for the unit, two basic factors must be considered:

1. Access to a 120V, 60 Hz power source.

2. The location must be convenient for running the antenna lead-in cable if outside

antenna installation is proposed.

BASE STATION ANTENNA

Since the maximum allowable power output of the transmitter is limited by the FCC,

the antenna is the most important factor affecting transmission distance. Only a

properly matched antenna system will allow maximum power transfer from the 50-

ohm transmission line to the radiating element.

The recommended method of antenna tuning is to use the built-in SWR meter to adjust

the antenna tuning for minimum reflected power on channel 21.

The radio may be used with any type of 50-ohm base station antenna. A ground plane

vertical antenna will provide the most uniform horizontal coverage. This type of

antenna is best suited for communication with a mobile unit. For point-to-point

operation where both stations are fixed, a directional beam will usually increase

communicating range since this type of antenna concentrates transmitted energy in

one direction. The beam antenna also allows the receiver to "listen" in only one

direction thus reducing interfering signals.

Antenna height is an important factor when maximum range is desired. Keep the

antenna clear of surrounding structures or foliage. FCC regulations for base station

antenna height are:

1. Omnidirectional antennas may not be higher than 60 feet above the ground when

using a tower, mast or pole, and no higher than 20 feet above an existing structure.

These are only general regulations applicable to most but not all parts of the nation.

Locations near airports and some military installations are subject to different rules;

therfore, it is best to contact your nearest Federal Communications Commission office

for information regarding your specific area.

MOBILE OPERATION/EMERGENCY POWER OPERATION

It is possible to operate the Cobra 2010 GTL WX from an external 13.8V DC power

supply for emergency conditions or from an automobile battery for mobile operation.

We recommend using a genuine Cobra DC power cord (not supplied). The DC power

cord can be purchased through your local dealer, or direct from Cobra. See CB radio

Accessories on the back page of this manual.

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Cobra 2010 GTL WX Instructions d'exploitation Page 7