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Cobra 20XTR Street Communicator Operating Instructions Manual

Made by: Cobra
Type: Operating Instructions
Category: Two-Way Radio
Pages: 15
Size: 0.8 MB

 

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26

Accessory Order Form

Tax Table

Ohio, Wisconsin residents add 5%
Indiana, Michigan residents add 6 %
Illinois residents add 8.75%
California residents add 7.25%

Please print clearly
Name___________________________________________________
Address (No P.O. Box)_____________________________________
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Zip_____________Telephone (____)__________________________
Credit Card No._________________________Exp. Date_________
Customer Signature__________________________________
Circle One:

Visa      MasterCard      Discover

Subtotal

(Tax if applicable)  

Shipping/handling

Total 

Shipping & Handling*

Amount of 

Shipping/

Order

Handling

$10.00 or less

$3.00 

$10.01-$25.00

$5.50 

$25.01-$50.00

$7.50

$50.01-$90.00

$10.50

$90.01-$130.00

$13.50

$130.01-$200.00 $16.50
$200.01 plus

10% of purchase

*For AK, HI and PR add additional
$26.95 for FedEx Next Day or
$10.95 for FedEx 2nd Day.Excludes
weekend and holiday shipments.

Please allow 2-3 weeks for
delivery in the U.S. Prices subject
to change without notice.

Item #

Description

Cost Ea. Qty. Amount

251-199-9-001

Replacement 
Mounting Bracket

634-081-9-001

Replacement 
Thumb Screws

741-080-9-001

Replacement 
Microphone Bracket

HG M84

4 Pin Premium Noise-
Cancelling Microphone

HG M84W

4 Pin Premium Noise-
Cancelling Microphone 
Wood Grain

HG M85

5 Pin Premium Noise-
Cancelling Microphone

HG M73

Replacement 
Dynamic Microphone

HG M75

4 Pin Power Microphone

HG M77

Noise Canceling 
Microphone

HG S100

Dynamic External Speaker

HG S300

Noise Canceling 
External Speaker

HG S500

Noise Canceling With 
Talk Back External Speaker

The Cobra® line of
quality products also
includes:

CB  Radios

microTALK® Radios

Radar/Laser Detectors

Safety Alert® 
Traffic Warning Systems

Accessories

GPS (Global Positioning
System)

HighGear™ Accessories

Power Inverters

VHF  Marine Radios

1.

CB Transceiver

2.

Microphone

3.

Transceiver Bracket

4.

Microphone Bracket

5.

Operating Manual

(not pictured)

6.

FCC Rules

(not pictured)

7.

Illuminated Antenna

CB Tranceiver

A1

The Citizens Band Story
FCC Information

4

7

2

1

3

Nothing Comes Close To A Cobra®

20 XTR

Street Communicator

Operating Instructions for your 

20 XTR

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 and Class C remote control frequencies.)

FCC Regulations

FCC regulations permit only "transmissions" (one-party 
to another) rather than" broadcast" (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 CB Radio:

©2003 Cobra Electronics Corporation
Printed in China

Part No. 480-079-P

Cobra Electronics Corporation

6500 West Cortland Street

Chicago, IL 60707 USA

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 1

 


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25

Optional
Accessories 

You can find accessories at
your local Cobra® dealer, or in
the U.S.A. you can order 
directly from Cobra®.

Ordering From U.S.A.

Call 773-889-3087 for pricing
or visit www.cobra.com.

For credit card orders

Complete and mail this order
form to:
Cobra® Electronics 
Attn: Accessories Department 
6500 West Cortland Street
Chicago, IL 60707 USA.

Or fax the completed form to
us at 773-622-2269.

You may also order by phone
by calling 773-889-3087 (press
1 from the main menu) 8:00
a.m. to 6:00 p.m. CT, Monday
through Friday.

To order online 

please visit our website:
www.cobra.com

Accessories

Dynamic External Speaker

HG S100

Noise Canceling External
Speaker

HG S300

Noise Canceling With Talk
Back External Speaker

HG S500

PA

ANT

13.8V DC

EXT

A2

Controls and Indicators

Thank you for purchasing the Cobra 20 XTR Radio
Transceiver. Properly used, this Cobra product will give
you many years of reliable service.

Customer Assistance

In this user’s manual, you should find all the
information you need to operate your radio. If you
require further assistance after reading this manual,
Cobra® Electronics offers the following customer
assistance services:

For Assistance In the U.S.A.

Automated Help Desk

English only. 24 hours a day, 7 days a week 
773-889-3087 (phone).

Customer Assistance Operators

English and Spanish. 8:00 a.m. to 6:00 p.m. CT,
Monday through Friday (except holidays) 
773-889-3087 (phone).

Questions

English and Spanish. Faxes can be received 
at 773-622-2269 (fax).

Technical Assistance

English only. www.cobra.com 
(on-line:Frequently Asked Questions).
English and Spanish. productinfo@cobra.com (e-mail).

For Assistance Outside  the U.S.A.

Contact Your Local Dealer

A3

1

7

6

Our Thanks to You

Customer Assistance

5

10

Front Side

1.

Microphone Connector.

2.

Off/On/Volume.

3.

Squelch.

4.

Channel 9/NOR

5.

CB/PA

6.

Channel Selector
Button.

7.

LED Channel Display.

8.

S/RF Power Meter.

9.

TX Indicator LED.

10.

Microphone

Back Side

11.

Antenna Connector

12.

Public Address

13.

Power Cord

14.

External Speaker
Connector

4

8

11

13

14

12

2

3

9

Customer
Assistance

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 4

 


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1

Contents

The CB Story

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A1

FCC Information/Included Accessories  . . . . . . . . . . . . . .A1

Controls and Indicators

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A2

Customer Assistance

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A3

Features

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Installation/Connection

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Mounting/Connections  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
CB Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Operation

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Turning on Your Radio  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Microphone Connector  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Squelch  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Channel Selection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Channel 9/NOR  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
CB/PA  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
S/RF Power Meter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
TX Indicator LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Real Panel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Ignition Noise Interference . . . . . . . . . . . . . . . . . . . . . . . . . .13
Temporary Mobile Operation  . . . . . . . . . . . . . . . . . . . . . . .13
Operation to Receive/Transmit  . . . . . . . . . . . . . . . . . . . . . .14

Maintenance

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Replacement Warning

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Rules You Should Know

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Channel 9 Emergency Messages  . . . . . . . . . . . . . . . . . . . .16
CB Distress Data  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

CB 10-Codes

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Frequency Ranges

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Specifications

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Warranty

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Product Service

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Accessories

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Order Form

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Features of This Product

Antenna Included

Antenna Illuminates
When PTT Is Pressed

40 CB Radio Channels

Instant Channel 9/NOR

PA  System

Compact Size

Dynamic Microphone

9  Foot Mic Cord

Front Panel Microphone
Connector

Table of Contents

Features

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 1

 


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Connect the red lead of DC power cord to an
accessory 12 volt fuse.

Connect the black lead to the negative side of the
automobile. This is usually the chassis. Any conve-
nient location with good electrical contact (remove
paint) may be used.

Mount the microphone bracket on right side of the
transceiver or near it using two screws supplied.
When mounting in an automobile, place the
bracket under the dash so the microphone is
readily accessible.

Attach the 4-pin microphone cable to receptacle
on front of unit and install unit in bracket securely.

Mounting and Connections

Select a location for the transceiver and microphone
bracket that is convenient for operation. In
automobiles, the transceiver is usually mounted to the
underneath of the dash panel, with the microphone
bracket beside it.

Hold the radio with mounting bracket in the exact
location desired. Remove the mounting bracket
and use it as a template to mark the location for
the mounting screws.

Drill necessary holes and secure mounting bracket
in location.

Connect the antenna cable plug to the receptacle
marked “ANT” on the back of the unit.

CB Tranceiver

EXT

ANT

13.8V DC

PA

3

Mounting and
Connections

Note

Before installing the CB radio,
visually check the vehicle
battery connections to
determine which battery
terminal, positive or negative
(positive is the larger of the
two) is grounded to the engine
block (or chassis).

2

Mounting and
Connections

Note

The transceiver is held in the
universal mounting bracket by
two thumb screws, permitting
adjustment at the most
convenient angle.

A universal mounting bracket
is supplied along with self
tapping screws and star
washers.

Operation

Installation

Installation

CB Transceiver

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 2

 


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Installation Instructions

This magnetic mount antenna has
been tested to withstand normal
high speed driving. The magnet
will hold securely under the
following conditions. Always make
sure the antenna base is on a clean, flat, painted or
unpainted surface. The magnetic base will not hold
on non-metallic or aluminum surfaces. Periodically
clean all parts of antenna to maintain maximum
performance.

Clean dust and dirt away from area where antenna
will be placed.

Place antenna on vehicle, roof, trunk lid, or any flat
surface. For best results centrally locate.

Run coax cable thru to inside of vehicle routed in a
manner where it will not interfere with the driver or
controls and connect to the antenna connector of
the radio.

5

Warning

Warning: This product is intended for off road use.
Please check the laws and regulations in your state,
county and/or municipality regarding installation and
use of this product.

The manufacturer makes no claims as to the edequacy
of use and assumes no liability for any improper use or
installation. Installation and use are solely the
responsibility of the purchaser.

Installation

4

Installation

CB Antenna
Installation

Note

Mobile installations (cars,
trucks, boats, etc) should 
be made only with a 
non-directional antenna
system.

A standard antenna connector 
(Type SO-239) is provided on
the Connector Box for easy
connection to a standard 
PL-259 cable termination.

CB Antenna

Do not remove foil covering from bottom of 
magnetic base. The foil protects the car finish.

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 4

 


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7

Squelch

This control is used to cut off or eliminate receiver
background noise in the absence of an incoming
signal. Adjust until the receiver noise disappears. This
will require the incoming signal to be slightly stronger
than average receiver noise. Further clockwise rotation
will increase the threshold level which a signal must
overcome in order to be heard. Only strong signals will
be heard at a maximum clockwise setting.

Squelch

Operation

6

Turning on

Turn volume control clockwise to turn power on and
set the desired listening volume.

Microphone Connector 

Allows for convenient removal of the microphone plug
when storage is required. The microphone MUST be
connected to the unit at all times when in use, for
proper operation.

Turning on
Your Radio

Operation

SHIELD

AUDIO

RX

TX

1

2

3

4

Microphone
Connector

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 6

 


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NOISE

WEAK SIGNALS

MEDIUM SIGNALS

STRONG SIGNALS

GA

TE CL

OSED

NOISE

WEAK SIGNALS

MEDIUM SIGNALS

STRONG SIGNALS

NOISE

WEAK SIGNALS

MEDIUM SIGNALS

STRONG SIGNALS

GA

TE 

OPEN

NOISE

WEAK SIGNALS

MEDIUM SIGNALS

STRONG SIGNALS

NOISE

WEAK SIGNALS

MEDIUM SIGNALS

STRONG SIGNALS

GA

TE 

9

To achieve the Desired Squelch Setting (DSS), turn
the Squelch control counterclockwise until you
hear noise. Now turn the control clockwise just
until the noise stops. This is the DSS setting.

Operation

8

Operation

Gate open

Gate set to Desired 
Squelch Setting (DSS)

Gate closed

Setting
Squelch

Setting Squelch 

Squelch is the “control gate” for incoming signals.

Full clockwise rotation closes the gate 
allowing only very strong signals to enter.

Full counterclockwise rotation opens the “gate”
allowing all signals in.

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 8

 


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11

S/RF Power Meter

Shows relative transmitter RF output power and input
signal strength when receiving. The LED (Light
Emitting Diode) segments glow green to amber to
red...this indicates receive or transmit activity.

TX Indicator LED

The indicator will light red when in the transmit mode.

Operation

S/RF
PowerMeter

TX Indicator
LED

Channel
Selection

10

Selecting a Channel

Rotate channel knob clockwise until desired channel is
displayed.

Channel 9/NOR

Set CH 9 to obtain instant access emergency channel.
In NOR position, all 40 CB channels are selected by the
channel button.

CB/PA

In the CB position, the PA function is disabled and the
unit will transmit and receive on the selected channel.
The PA function should not be used unless a PA
speaker is connected.

Operation

Channel 
9/NOR

CB/PA

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 10

 


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13

Ignition Noise Interference

Use of a mobile receiver at low signal levels is
normally limited by the presence of electrical noise.
Under most operating conditions, 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 vehicle engine turned off. The unit
requires very little current and therefore will not
significantly discharge the vehicle battery.

Even though this radio has an automatic noise limiter,
in some installations ignition interference may be
high enough to make good communications
impossible. Consult your COBRA dealer or a 2-way
radio technician for help in locating and correcting
the source of severe noise.

Temporary Mobile Operation

For temporary mobile operation, you may want to
purchase an additional cigarette lighter adapter from
your COBRA dealer. This adapter and a magnetic
mount antenna allow you to quickly "install" your
transceiver for temporary use.

Operation

Ignition Noise
Interference

Note

When using the unit with
cigarette adapter, turn off
when not in use to avoid
draining the  battery.

Temporary
Mobile
Operation

Note

Red wire is connected to
positive side of socket center
tip. Black wire is connected to
negative side contacts.

Note

Radio resets to CH 9 when
connected to cigarette 
lighter plug.

EXT

ANT

13.8V DC

PA

12

Rear Panel

Antenna Connector

This female connector permits connection of the
transmission line cable male connector to the
transceiver.

External Speaker

The External Speaker Jack is used for an external
speaker. The external speaker should have 8-ohm
impedance and be rated to handle at least 4.0 watts.
When the external speaker is plugged in, the internal
speaker is automatically disconnected.

Power

These wires supply power to the CB radio. This cable is
permanently attached to the radio. If you wish to
remove the radio after installation, disconnect at fuse
holder and ground connector.

Public Address

An external PA speaker may be connected to the PA
speaker jack when used as a public address system.
The speaker should be directed away from the
microphone to prevent acoustic feed-back. Physical
separation or isolation of the microphone and speaker
must be employed when operating the PA at high
output levels.

Rear Panel

Antenna Connector

External Speaker

Power

Public Address

Operation

Note

Cobra external speakers are
rated 15 watts

EXT

ANT

13.8V DC

PA

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 12

 


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15

Maintenance/
Adjustment

Maintenance

Maintenance and Adjustment

Your COBRA CB transceiver is specifically designed for
the environment encountered in mobile installations.
The use of all solid state circuitry and its light weight
result in high reliability. Should a failure occur,
however, review the following, then if necessary,
replace parts only with identical parts. Do not
substitute.

Check connections to the source of power and
make sure it is the 13.8 VDC required to operate
your radio.

Check the fuses in the DC power cord. The main
power lead (red ) has a 2 amp 3AG type fuse in its
holder. Use only the above specified type and size
fuse for maximum protection. Failure to do so will
void the warranty.

Make certain the microphone is properly
plugged in.

Make certain the antenna is properly assembled
and connected.

If you are unable to correct the problem, refer to the
SERVICE INSTRUCTIONS at the end of this manual for
the correct procedure for warranty and post-warranty
service from COBRA.

14

Operating Procedure to Receive

Be sure that power cord, antenna and microphone
are connected to the proper connectors before
proceeding further. The CB/PA switch should be in
the "CB" position.

Turn the radio ON by rotating the  VOLUME
CONTROL clockwise.

Rotate SQUELCH CONTROL counterclockwise until
incoming signal 
is heard.

Select the desired channel.

Set VOLUME CONTROL  to a comfortable listening
level.

Operating Procedure to Transmit

Select the desired channel.

The receiver and transmitter are controlled by the
press-to-talk switch on the microphone. Press the
switch and the transmitter is activated; release
switch to receive. When transmitting (on a clear
channel), hold the microphone two inches from the
mouth and speak clearly in a normal voice.

Be sure the antenna is properly connected to the
radio before transmitting. Prolonged transmitting
without an antenna, or a poorly matched antenna,
could cause damage to the transmitter.

Operation

Operating
Procedure 
to Receive

Operating
Procedure 
to Transmit

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 14

 


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CB Distress
Data

17

CB Distress Data

CB Distress Data

When transmitting an emergency, you should
request a “REACT BASE” and provide the CB
distress data (called 

CLIP

):

C

all Sign

Identify yourself.

L

ocation

Be exact.

I

njuries

Number. Type. Trapped?

P

roblem

Give details and help needed.

Transmit 

CLIP

repeatedly so any monitor can assist.

The FCC gives the following examples of permitted
and prohibited types of communications for use on
Channel 9. These are guidelines and are not intended
to be all-inclusive.

The FCC gives these examples of permitted and
prohibited messages for channel 9. These are only
guidelines and not all-inclusive:

Permitted

Example Message

Yes

“Tornado sighted six miles north 
of town.”

No

“Post number 10. No tornado
sighted.”

Yes

“Out of gas on I-95 at mile marker
211.”

No

“Out of gas in my driveway.”

Yes

“Four car accident on I-94 at Exit 11.
Send police and ambulance.”

No

“Traffic moving smoothly on I-94.”

Warning & Rules

16

A Few Rules
You Should
Know

Replacement Warning

Replacement or substitution of certain parts with 
replacements other than those recommended by
Cobra may be a violation of the technical regulations
of Part 95 of the FCC rules, or of Type Acceptance
requirements of Part 2 of said rules.

When making adjustments, be sure to re-read
applicable portions of this instruction manual to make
certain you are following correct procedure 
and that the radio was properly installed, etc.

A Few Rules That Should Be Obeyed

You are not allowed to carry on a conversation
with another station for more than five minutes at
a time without taking a one-minute break to give
others a chance to use the channel.

You are not allowed to blast others off the air by
overpowering them with illegally amplified
transmitter power or illegally high antennas.

You can't use CB to promote illegal activities.

You are not allowed to use profanity.

You may not play music in your CB.

You may not use your CB to sell merchandise or
professional service.

Set to channel 9 for emergencies

Be sure antenna is properly connected.

Replacement
Warning

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 16

 


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19

10-28

Identify your station

10-29

Time is up for contact

10-30

Does not conform to FCC rules

10-33

Emergency traffic   

10-34

Trouble at this station

10-35

Confidential information

10-36

Correct time is

10-37

Wrecker needed at

10-38

Ambulance needed

10-39

Message delivered

10-41

Turn to channel

10-42

Traffic accident at

10-43

Traffic tie up at

10-44

Have a message for

10-45

All units within range please report

10-50

Break channel

10-60

What is next  message number?

10-62

Unable to copy. Use phone

10-63

Net directed to

10-64

Net clear

10-65

Awaiting your next message/assignment

10-67

All units comply

10-70

Fire at

10-71

Proceed, transmission in sequence

10-77

Negative contact

10-81

Reserve hotel room for

10-82

Reserve room for

10-85

My address is

10-91

Talk closer to mic

10-93

Check my frequency on this channel

10-94

Give me a long count

10-99

Mission completed, all units secure

10-200

Police needed at

CB 10-Codes

18

CB 10-Codes

Citizen Bands have adopted the “10-CODES” for
standard questions and answers. These codes provide
quick and easy communication, especially in noisy
areas. Following are some of the more common codes
and meanings:

Code

Meaning

10-1

Receiving poorly

10-2

Receiving well

10-3

Stop transmitting

10-4

OK, message received

10-5

Relay message

10-6

Busy, stand by

10-7

Out of service, leaving

10-8

In service, subject to call

10-9

Repeat message

10-10

Transmission completed standing by

10-11

Talking too rapidly

10-12

Visitors present

10-13

Advise weather/roads 

10-16

Make pick up at

10-17

Urgent business

10-18

Anything for us?

10-19

Return to base

10-20

My location is

10-21

Call by phone

10-22

Report in person to

10-23

Stand by

10-24

Completed last assignment

10-25

Can you contact

10-26

Disregard last info

10-27

Moving to channel

CB 10-Codes

CB 10-Codes

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21

Specifications

GENERAL

CHANNELS . . . . . . . . . . . . . . . . . . . . . . . CB - 40 CH 
FREQUENCY RANGE. . . . . . . . . . . . . . . CB - 26.965 TO 27.405 MHZ
FREQUENCY TOLERANCE . . . . . . . . . . 0.005 %
FREQUENCY CONTROL  . . . . . . . . . . . PLL (PHASE LOCK LOOP) SYNTHESIZER
OPERATING TEMP. RANGE . . . . . . . . . -30° C TO + 65° C
MICROPHONE . . . . . . . . . . . . . . . . . . . . PLUG-IN DYNAMIC
INPUT VOLTAGE  . . . . . . . . . . . . . . . . . . 13.8VDC nom. (negative ground) 
CURRENT DRAIN . . . . . . . . . . . . . . . . . . TRANSMIT: AM FULL MOD., 1.4A  (MAXIMUM) 

RECEIVE: SQUELCHED, 0.9 A;
FULL AUDIO OUTPUT, 1.2A (NOMINAL)

SIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7/8” D X 6-3/4” W X 1-7/8” H
WEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . 3.25 LBS.
ANTENNA CONNECTOR . . . . . . . . . . . UHF; SO-239
METER. . . . . . . . . . . . . . . . . . . . . . . . . . . . LED; INDICATES RELATIVE POWER 

OUTPUT AND RECEIVED SIGNAL STRENGTH

TRANSMITTER

POWER OUTPUT . . . . . . . . . . . . . . . . . . 4 WATTS
MODULATION . . . . . . . . . . . . . . . . . . . . AM (AMPLITUDE MODULATION)
FREQUENCY RESPONSE . . . . . . . . . . . 300 TO 3000 HZ
OUTPUT IMPEDANCE . . . . . . . . . . . . . 50 OHMS, UNBALANCED

RECEIVER

SENSITIVITY. . . . . . . . . . . . . . . . . . . . . . . LESS THAN 1 µV FOR 10dB (S+N) 
SELECTIVITY . . . . . . . . . . . . . . . . . . . . . . 6 dB @ 7 KHZ, 60 DB @ 10KHZ
IMAGE REJECTION . . . . . . . . . . . . . . . . 60 dB, TYPICAL
ADJACENT-CHANNEL REJECTION. . 50 dB, TYPICAL
AUTOMATIC NOISE LIMITER . . . . . . . BUILT-IN

Specifications

20

Frequency
Ranges

Frequency Ranges

Frequency Ranges

The Cobra 20 XTR transceiver represents one of the
most advanced AM two-way radios used as a Class D
station in the Citizens Radio Service. This unit features
advanced Phase Lock Loop (PLL) circuitry providing
complete coverage of all 40 CB channels.

Channel Channel

CB

Frequency

CB Frequency

Channel

In MHz

Channel

In MHz

1

26.965

21

27.215

2

26.975

22

27.225

3

26.985

23

27.255

4

27.005

24

27.235

5

27.015

25

27.245

6

27.025

26

27.265

7

27.035

27

27.275

8

27.055

28

27.285

9

27.065

29

27.295

10

27.075

30

27.305

11

27.085

31

27.315

12

27.105

32

27.325

13

27.115

33

27.335

14

27.125

34

27.345

15

27.135

35

27.355

16

27.155

36

27.365

17

27.165

37

27.375

18

27.175

38

27.385

19

27.185

39

27.395

20

27.205

40

27.405

Specifications

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 20

 


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23

Product Service

If you think you need service call 773.889.3087

If your product should require factory service please call
Cobra first before sending in your unit. This will ensure the
fastest turn-around time on your repair.

You may be asked to send your unit to the Cobra
factory. It will be necessary to furnish the following in
order to have the product serviced and returned.

For Warranty Repair include some form of 
proof-of-purchase, such as a mechanical
reproduction or carbon of a sales receipt. If you
send the original receipt it cannot be returned.

Send the entire product.

Enclose a description of what is happening with
the unit. Include a typed or clearly print name and
address of where the unit is to be returned.

Pack unit securely to prevent damage in transit. If
possible, use the original packing material.

Ship prepaid and insured by way of a traceable
carrier such as United Parcel Service (UPS) or First
Class Mail to avoid loss in transit to: Cobra Factory
Service, Cobra Electronics Corporation, 6500 West
Cortland Street, Chicago, IL 60707 USA.

If the unit is in warranty, upon receipt of your unit it
will either be repaired or exchanged depending on
the model. Please allow approximately 3 to 4 weeks
before contacting us for status. If the unit is out of
warranty a letter will automatically be sent
informing you of the repair charge or replacement
charge. If you have any questions, please call
773.889.3087 for assistance.

Product
Service

For technical assistance,

please call our Automated
Help Desk at (773) 889-3087
24 hours a day, 7 days a week.
This can assist you by
answering the most frequently
asked questions about Cobra
products.

A Consumer Service
Representative

can be

reached at (773) 889-3087 
8:00 am - 6:00 pm,
Monday through Friday, CT.

Technical assistance

is also

available on-line in the
Frequently Asked Questions
(FAQ) section at
www.cobra.com 
or by e-mail to
productinfo@cobra.com

Product Service

22

Limited One Year Warranty

COBRA ELECTRONICS CORPORATION 

warrants that its

COBRA CB Transceiver, and the component parts thereof, will
be free of defects in material and workmanship for a period
of one (1) year from the date of consumer purchase. This
warranty may be enforced by the first consumer purchaser,
provided that the product is utilized within the U.S.A.

COBRA will, without charge, repair or replace, at its option, a
defective CB Transceiver upon delivery to the COBRA factory
Service Department, accompanied by proof of the date of
first consumer purchase, such a duplicated sales receipt.

You must pay initial shipping charges required to ship the
product for warranty service, but the return charges will be at
COBRA’S expense, if the product is repaired or replaced under
warranty.

This warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.

Exclusions:

This limited warranty does not apply;

1) to any product damaged by accident;
2) in the event of misuse or abuse of the product or as a
result of unauthorized alterations or repairs;
3) if the serial number has been altered, defaced or removed;
4) if the owner of the product resides outside the U.S.A.

All implied warranties, including warranties of
merchantability and fitness for a particular purpose are
limited in duration to the length of this warranty.

COBRA shall not be liable for any incidental, consequential
or other damages; including, without limitation, damages
resulting from loss of use or cost of installation.

Some states do not allow limitations on how long an
implied warranty lasts and/or do not allow the exclusion or
limitation of incidental or consequential damages, so the
above limitations may not apply to you.

Cobra Electronics
Corporation

6500 West Cortland Street
Chicago, Illinois 60707 USA

Limited One Year Warranty

1

Ye

ar Warran

ty

20 XTR MANUAL.qxd  4/17/03  4:56 PM  Page 22

 


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24

Accessories

Replacement Mounting
Bracket

251-199-9-001

Replacement Thumb Screws

634-081-9-001

Replacement Microphone
Bracket

741-080-9-001

4 Pin Power Microphone 

HG M75 

4 Pin Noise Canceling
Microphone

HG M77

4 Pin Replacement
Dynamic Microphone

HG M73

4 Pin Premium Noise-
Cancelling Microphone

HG M84

4 Pin Premium Noise-
Cancelling Microphone

Wood Grain
HG M84W

5 Pin Premium Noise-
Cancelling Microphone

HG M85

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