Antennas; Cb Antenna; Marine Installation; Ignition Noise Interference - Cobra 25 NW ST Operating Instructions Manual

Antennas

CB Antenna

CB Antenna
Since the maximum allowable power output of
Note
the transmitter is limited by the IC/FCC, the
For optimum performance in
antenna is critical in affecting transmission dis-
passenger cars the ideal anten-
tance. Only a properly matched antenna system
na location is on the center of
will allow maximum power output. Cobra loaded
the roof. Second choice is on the
type antenna models are highly recommended
center of the trunk.
for most installations. Consult your Cobra dealer
for further details.
Note
Because many newer trucks
feature fiberglass door skins, the
outside mirror must be ground-
ed 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
A standard antenna connector is provided
1
operation of all three bands
on the transceiver for easy connection.
(AM-FM & CB), using a single
antenna. However, this type of
antenna usually results in less
than normal transmit and

Marine Installation

receive range when compared
The transceiver will not operate at maximum effi-
to a standard-type "Single
ciency in a boat without a ground plate, (unless it
Band" CB antenna.
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.
6
DATE OF
ANT
MFG :JUNE 98 FCC ID:BBO3K229LTD
COBRA PA.SP. EXT.SP.
MADE IN CHINA
+
SERIAL NO.:806135776
PRECISION ENGINEERED PRODUCT OF
COBRA ELECTRONICS CORP. CHICAGO, ILL.60707
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 back-
ground 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 signifi-
cantly discharge the vehicle's battery.
Even though the Cobra 25 NW ST has an auto-
matic noise limiter, in some installations ignition
interference may be high enough to make good
–
POWER
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.

Ignition Noise Interference

7