Antennas; Ignition Noise Interference - Cobra 29 LX MAX User Manual

Antennas

Note
CB Antenna
For optimum performance
Since the maximum allowable power output of the
in passenger cars the ideal
transmitter is limited by the FCC, the antenna is critical
antenna location is on the
in affecting the transmission distance. Only a properly
center of the roof.
matched antenna system will allow maximum power
Second choice is on the center
output. Loaded type antenna models are highly
of the trunk.
recommended for most installations. The 29 LX MAX
includes a weather mode (WX), a Dual Band (Center
Note
Load/Base Load) antenna is recommended. Consult your
Because many newer trucks
Cobra dealer for further details, or visit our website:
feature fiberglass door skins,
www.cobra.com
the outside mirror must be
grounded to the chassis via a
ground strap, if the antenna is
mounted on the mirror bracket.
Note
3-way Combination Antennas
are also available which allow
operation of all three bands
(AM-FM & CB), using a single
antenna. However, this type
of antenna usually results in
A standard antenna connector is provided
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less than normal transmit and
on the transceiver for easy connection.
receive range when compared
to a standard-type "Single
Band" CB antenna.
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Ignition Noise Interference

Use of a mobile receiver at low signal levels is normally
limited by the presence of electrical noise. The primary
source of noise in automobiles is from the alternator
and ignition system. Typically, when the signal level is
adequate, the background noise does not present a
serious problem. Also, when extremely low level signals
are being received, the transceiver may be operated with
the vehicle's engine turned off. The unit requires very
little current and therefore will not significantly discharge
the vehicle's battery.
Even though the Cobra 29 LX MAX has an automatic noise
limiter, in some installations ignition interference may be
high enough to make good communications challenging.
Many possibilities exist and variations between vehicles
require different solutions. Consult with your Cobra
dealer or radio technician for help in locating the source
of severe noise.
Marine Installation
The transceiver will not operate at maximum efficiency
in a boat without a ground plane, (unless it has a steel
hull). Before attempting installation , consult your dealer
for information regarding an adequate grounding system
and prevention of electrolysis between fittings in the hull
and water.
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