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5
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.