Cobra 25 NW, 25 NW LTD Classic Operating Instructions Manual

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Operating Instructions
for your Cobra 25 NW

CB Radio

25 NW LTD CLASSIC

LTD CLASSIC

“Ingenious Products for Easier Communication.”

25 NW 

CB Radio

“Ingenious Products for Easier Communication.”

Operating Instructions
for your Cobr

25 NW

RF GAIN DYNA

DIM

SIG1 3 5 79 +30dB

RF

MIN MAX MIN MAXOFF

LTD CLASSIC

The CB Story

CB Transceiver

The Citizens Band lies between the shortwave
broadcast and 10-meter Amateur radio bands,
and was established by law in 1949.The Class D
two-way communications service was opened in

1959. (CB also includes a Class A citizens band

2

and Class C remote control frequencies.)

3

4

5

1

FCC Regulations

FCC regulations permit only “transmissions”
(one party to another) rather than “broadcasts”
(to a wide audience).Thus, advertising is not
allowed on CB Channels because that is “broad­casting.”

FCC Warnings

All transmitter adjustments other than those
supplied by the manufacturer as front panel
operating controls,must be made by,or under
the supervision of, the holder of an FCC-issued
General Radio-Telephone Operator’s License.

Replacement or substitution of transistors,regular
diodes or other parts of a unique nature, with
parts other than those recommended by Cobra,
may cause violation of the technical regulations
of Part 95 of the FCC Rules,or violation of Type
Acceptance requirements of Part 2 of the Rules.

You should read and understand Part 95 (included
with this unit) of the FCC Rules and Regulations,
before operating your Cobra radio, even though
the FCC no longer requires you to obtain an oper­ator’s license.

What’s Included with Your 25 NW

1. CB transceiver 6. DC power cord

2. Microphone 7. FCC rules

3. Transceiver bracket 1. (not pictured)

4. Microphone bracket

5. Operating Manual

A1

ANT

PA.SP. EXT.SP.

+POWER–

DATE OF 
MFG :JUNE 98

FCC ID:BBO3K229LTD

COBRA

MADE IN CHINA

SERIAL NO.:806135776
PRECISION ENGINEERED PRODUCT OF
COBRA ELECTRONICS CORP. CHICAGO, ILL.60707

Controls and Indicators

SIG1 3 5 7 9 +30dB

RF

MIN MAX MIN MAXOFF

LTD CLASSIC

1. 4-Pin Microphone Connector

2. Power On/Off/Volume

3. Squelch

4. RF Gain/DynaMike

5. Dim

6. Channel Selector

7. LED Channel Display

8. RX (Receive)/ TX (Transmit)

LED Indicator

9. Channel 19/Channel 9/

Normal Switch

10. CB/PA Switch

11. NB/Off Switch

12. ANL/Off Switch

13. Signal Strength Meter

14. Microphone

Back Side

15. Public Address Speaker Jack

16. External Speaker Jack

17. Antenna Connector

18. Power Jack

13

1

9

10

11

12

2 4 5

3

14

8

7

6

15 16

A2

17 18

Our Thanks to You

Thank you for purchasing the Cobra 25 NW CB
Radio. Properly used, this Cobra product will give
you many years of reliable service.

Customer Support

Should you encounter any problems with the
product or not understand its many features,
please refer to this owner’s manual. If , after
referring to the manual, you still need help,
call Cobra Customer Service at 773.889.3087.

Cobra Customer Service

Live operators are available
M-F 8:00 am - 6:00 pm CST at:

773.889.3087

Automated Technical Assistance
available 24 hours a day,seven
days a week. E-mail questions
to: productinfo@cobraelec­tronics.com

Cobra on the World Wide Web:
Frequently Asked Questions
(FAQ) can be found on-line at:
www.cobraelectronics.com

A3

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