Cobra Electronics 25 NW User Manual
How to Use Your
Contents
Features
The CB Story..................................................................................A1
Controls & Indicators................................................................A2
Our Thanks to You ......................................................................A3
Installation
Antennas
Ignition Noise Interference ...................................................7
Operating Your 25 NW
How Your CB Can Serve You...................................................25
Frequency Ranges......................................................................29
25 NW Specifications................................................................30
Warranty Information..............................................................31
Optional Accessories.................................................................32
Order Form ....................................................................................34
If You Think You Need Service .............................Back Cover
...........................................................................................1
FCC Regulations
FCC Warnings
Included Accessories
Customer Support
Location.......................................................................................2
Mounting and Connection...................................................2
CB Antenna ................................................................................6
Marine Installation...................................................................6
Turning On Your CB.................................................................8
Setting Channel Selector.......................................................9
To Receive...................................................................................10
Selecting a Channel ................................................................10
S-Meter.........................................................................................11
Dimmer Control........................................................................12
RF Gain Control.........................................................................12
Setting Squelch.........................................................................13
To Transmit .................................................................................15
Setting Dynamike ....................................................................16
Transmit.......................................................................................17
RF Meter ......................................................................................17
External Speaker.......................................................................18
PA (Public Address)..................................................................19
ANL (Automatic Noise Limiter) Switch.............................21
NB, OFF (Noise Blanker) Switch ...........................................21
Temporary Mobile Set-Up.....................................................22
Home And Office Set-Up.......................................................23
A Few Rules You Should Know............................................25
Channel 9 Emergency Messages .......................................25
CB 10 Codes...............................................................................27
Cobra 25 NW
Features of This Product
• 40 CB Radio Channels
• Heavy-Duty Dynamic
Microphone
• Full 4 Watts AM RF Power Output
• Instant Channel 19 and 9
• Front Panel 4-Pin Microphone
Connector
• Switchable Noise Blanker
• Switchable Automatic
Noise Limiter
• Adjustable Dynamike Boost
• Tactile Controls
• Illuminated Front Panel
• Dimmer Control
• RF Gain
• 9 ft. mic cord
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK DO NOT REMOVE COVER (OR BACK)
NO USER SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL
!
!
1
Installation
CB Transceiver
Location
Mounting and
Connection
Note
The transceiver is held in the
universal mounting bracket by
two thumbscrews which allow
for adjustment at a convenient
angle.
The bracket includes two selftapping screws and star washers.The mounting must be
mechanically strong,conveniently located.
Location
Plan location of transceiver and microphone
bracket before starting the installation.
Select a location that is convenient for operation,
yet does not interfere with the driver or passenger.
The transceiver is usually mounted to the underside of the dash with the microphone bracket
beside it.
Mounting and Connection
1
Hold the radio with the mounting bracket in
the exact desired location. If there is no interference,remove the bracket and use it as a
template to mark the location for the mounting screws.
2
2
Drill the holes and secure the bracket.
3
ANT
PA.SP. EXT.SP.
+POWER —
FCC ID:BBO3K229LTD
COBRA
MADE IN CHINA
SERIAL NO.:806135776
PRECISION ENGINEERED PRODUCT OF
COBRA ELECTRONICS CORP. CHICAGO, ILL.60707
Connect the antenna cable plug to the receptacle marked “ANT” on the back of the unit.
Installation
continued
3
Installation
Note
Before installing the CB radio,
visually check the vehicle’s
battery connection to determine which terminal, positive
or negative, is grounded (positive is the larger of the two)
to the engine block (or chassis). A negatively grounded
vehicle has its negative lead
grounded to the chassis.
Note
Connecting to an accessory fuse
prevents the unit from being left
on accidentally,and also permits operating the unit without
running the engine.
Note
In positive ground vehicles the
red wire goes to the chassis and
the black wire is connected to
the ignition switch.
4
In a negative grounded vehicle,connect the
red lead of the DC power cord to an accessory
12 volt fuse.
5
Connect the black lead to the negative side of
the vehicle.This is usually the chassis. Any convenient location with a good electrical contact
(remove paint) may be used.
4
6
ANT
PA.SP. EXT.SP.
+POWER –
JUNE 98
FCC ID:BBO3K229LTD
COBRA
MADE IN CHINA
SIG 1 3 5 7 9 +30dB
RF
MIN MAX MIN MAXOFF
SHIELD
AUDIO
RX
TX
1
2
3
4
Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.
7
Mount the microphone
bracket on the right side
of the unit (driver’s left)
using two screws supplied. Bracket should be
placed under the dash
so microphone is readily
accessible.
Installation
Microphone
Connector
8
Attach the 4-pin microphone cable to receptacle on front of unit and Install unit in bracket
securely.
5
ANT
PA.SP. EXT.SP.
+POWER—
FCC ID:BBO3K229LTD
COBRA
MADE IN CHINA
SERIAL NO.:806135776
PRECISION ENGINEERED PRODUCT OF
COBRA ELECTRONICS CORP. CHICAGO, ILL.60707
Antennas
CB Antenna
Note
For optimum performance in
passenger cars the ideal antenna location is on the center of
the roof.Second 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,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 less
than normal transmit and
receive range when compared
to a standard-type “Single
Band” CB antenna.Call
773.889.3087 for further information.
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
maximum power output. Cobra loaded type
antenna models are highly recommended for
most installations. Consult your Cobra dealer for
further details, or call 773.889.3087 and speak to
a Cobra representative.
1
A standard antenna connector is provided
on the transceiver for easy connection.
Marine Installation
The transceiver will not operate at maximum efficiency in a boat without a ground plate, (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.
6
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 25 NW 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.
7
Operation
SIG 1 3 5 7 9 +30dB
RF
MIN MAX
MIN MAX
OFF
25 NW LTD CLASSIC
LTD CLASSIC
Turning On
Turning On
Make sure the power cord,antenna and microphone are connected to their proper connectors
before starting.
1
The CB/PA button should be in the
CB position.
2
Rotate the On/Off Volume knob clockwise to
a normal listening level.
8
Operation
MIN MAX
MIN MAX
LTD CLASSIC
Setting Channel Selector
1
Select one of forty channels and adjust
volume.The selected channel is indicated by
the LED readout directly above the channel
selector knob
Setting Channel
Selector
9
Operation
25 NW
LTD CLASSIC
LTD CLASSIC
To Receive
Selecting A
Channel
Note
Switch to 9 (Emergency) or 19
(Information) for instant access
to these channels.
To Receive
1
Rotate the On/Off Volume knob clockwise
the green RX/TX LED will be illiuminated.
Selecting A Channel
1
Switch to NOR to select desired channel.
10
Operation
S-Meter
Swings proportionately to strength of incoming
signal when receiving.
S-Meter
11
Operation
SIG 1 3 5 7 9 +30dB
RF
MIN MAX
MIN MAX
OFF
25 NW
LTD CLASSIC
SQL
MIN MAX
MIN MAX
LTD CLASSIC
Dimmer Control
Note
The Dim controls the brightness
of the front panel, signal strength
meter and channel display.
RF Gain Control
Note
The RF Gain is used to optimize
reception in weak signal areas.
Dimmer Control
1
Rotate the DIM knob clockwise for
maximum brightness; counter-clockwise
for minimum.
RF Gain Control
The RF Gain is used to optimize reception in
strong or weak signal areas.
1
Rotate the RF Gain knob counterclockwise
to reduce gain in strong signal areas.In weak
signal areas turn clockwise to increase gain.
12
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