Ignition Noise Interference; Features - Cobra 29 LTD CHR How To Use Manual

Antennas
CB Antenna
CB Antenna
Since the maximum allowable power output of
the transmitter is limited by the FCC, the antenna
is critical in affecting transmission distance. Only
a properly matched antenna system will allow
Note
maximum power output. Cobra loaded type
For optimum performance in
antenna models are highly recommended for
passenger cars the ideal
most installations. Consult your Cobra dealer for
antenna location is on the
further details, or call 773.889.3087 and speak to
center of the roof. Second
a Cobra representative.
choice is on the
center of the trunk.
Note
Because many newer trucks
feature fiberglass door skins,
the outside mirror must be
grounded to the chassis via a
ground strap when antenna is
mounted on the mirror bracket.
A standard antenna connector is provided
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on the transceiver for easy connection.
Note
3-way Combination
Antennas are also available
which allow operation of all
Marine Installation
three bands (AM-FM & CB),
The transceiver will not operate at maximum
using a single antenna.
efficiency in a boat without a ground plate,
However, this type of antenna
(unless it has a steel hull). Before attempting
usually results in less than
installation , consult your dealer for information
normal transmit and receive
regarding an adequate grounding system and
range when compared to a
prevention of electrolysis between fittings in the
standard-type "Single Band" CB
hull and water.
antenna. Call 773-889-3087 for
further information.
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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 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 LTD CHR has an
automatic noise limiter, in some installations
ignition interference may be high enough to
make good communications impossible. Many
possibilities exist and variations between vehicles
require different solutions. Consult your COBRA
dealer or a 2-way radio technician for help in
locating the source of a severe noise.
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