Cobra_18wxst Cb Tranciever_manual

							InstallationLocationPlan the location of the transceiver and microphone bracket
before  starting the installation. Select a location that is conve-
nient for operation and does not interfere with the driver or
passengers in the vehicle. In automobiles, the transceiver is
usually mounted to the underneath of the dash panel, with the
microphone bracket beside it.Mounting and ConnectionsThe transceiver is held in the universal mounting bracket by
two thumb screws, permitting adjustment at the most conve-
nient angle.
A universal mounting bracket is supplied along with self tap-
ping screws and star washers. The mounting must be mechan-
ically strong and also provide a good electrical connection to
the chassis of the vehicle. To mount the transceiver:1.
Determine the most con-
venient location in your
vehicle. Hold the COBRA
radio with mounting
bracket in the exact loca-
tion desired. If nothing
will interfere with mount-
ing it in the desired posi-
tion, remove the mounting
bracket and use it as a tem-
plate to mark the location
for the mounting screws.
2.
Drill necessary holes and secure mounting bracket in 
location. 
Operating Instructions for Your
CITIZENS BAND 
2-WAY MOBILE RADIO
1
WITH INSTANT EMERGENCY CHANNEL 9Welcome to the Cobra Family of 2-way communications.
Cobra has dedicated over 30 years of research and develop-
ment to the technology that made Cobra #1 in CB Radios.
Please take some time to read this booklet. Although this CB
is simple to operate, we want you to be aware of all the
unique features your new CB Radio offers.THE CB STORYThe 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 A remote control frequencies.)
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.
“Cuts Static coming in, adds Punch going out!”
Cobra proudly introduces the first Patent Pending technolo-
gy that dramatically improves the transmission and recep-
tion of CB radio signals.
This revolutionary system reconfigures the transmission sig-
nal which allows it to be transferred more effectively through
cluttered airwaves. It literally ÒpunchesÓ your message
through the hundreds of thousands of signals that are in the
air. At the same time, SoundTracker system dynamically
adjusts the relationship between the signal and static com-
monly referred to as noise. This allows CobraÕs SoundTracker
system to significantly reduce the amount of static on all
incoming CB signals. The system can be further optimized
when two SoundTracker CBÕs are used to talk to each other.
The end result is a clearer, cleaner sounding reception of sig-
nals and more powerful transmission which 
dramatically
improve CB CommunicationsWARNING
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 techni-
cal regulations of Part 95 of the FCC Rules, or violation of
Type Acceptance requirements of Part 2 of the Rules.
LICENSING
Citizens Band (CB) Radio operators are no longer re-
quired to obtain an FCC license to operate their CB
equipment or provide station identification.
Nevertheless, an operator of a CB radio station is still re-
quired to comply with the communications act and with
the rules of CB Radio Operation.
Model 
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							Mobile whip antennas utilize the metal body of the vehicle as
a ground plane. When mounted at a corner of the vehicle they
are slightly directional, in the direction of the body of the vehi-
cle. For all practical purposes, however, the radiation pattern is
non-directional. The slight directional characteristic will be
observed only at extreme distances. Astandard antenna con-
nector (Type SO-239) is provided on the transceiver for easy
connection to a standard PL-259 cable termination. Cobra load-
ed-type antenna models AT-35, AT-60 and AT-70 are highly rec-
ommended for most installations. Consult your Cobra dealer
for further details (or see order form at the back of this book).
When installed in a boat, the transceiver will not operate at
maximum efficiency without a ground plate unless the vessel
has a steel hull. Before installing the transceiver in a boat, con-
sult your dealer for information regarding an adequate
grounding system and prevention of electrolysis between fit-
tings in the hull and water.
3-Way Combination Antennas are available which allow op-
eration of all three bands (AM-FM & CB), using a single
antenna. However, use of this type of antenna usually
results in less than normal transmit and receive range when
compared to a standard-type Single Band antenna
designed for CB only.Ignition Noise InterferenceUse of a mobile receiver at low signal levels is normally limited
by the presence of electrical noise. The primary source of noise
in automobile installations is from the alternator and ignition
system in the vehicle. 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 COBRAradio has an automatic noise limiter, in
some installations ignition interference may be high enough to
make good communications impossible. The electrical noise may
come from several sources. Many possibilities exist, and varia-
tions between vehicles require different solutions to reduce the
noise. Consult your COBRAdealer or a 2-way radio technician
for help in locating and correcting the source of severe noise.
3.
Connect the antenna cable plug to the standard recep-
tacle on the unit. Most CB antennas are terminated
with a type PL-259 plug which mates with the recepta-
cle marked ANT.
4.
Connect the red lead of DC power cord to +13.8 VDC.
In automobile installations, +13.8VDC is usually ob-
tained from the accessory contact in the fuse box. This
prevents the set being left on accidentally and also per-
mits operating the unit without the vehicles engine
running.
Before installing the CB radio, visually check the ve-
hicle 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).
5.
Connect the black lead to the negative side of the auto-
mobile. This is usually the chassis of the car. Any con-
venient location with good electrical contact (remove
paint) may be used.
6.
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.
CB AntennaSince the maximum allowable power output to the trans-
mitter is limited by the FCC, the antenna is one important
factor affecting transmission distance. Only a properly
matched antenna system will allow maximum power trans-
fer from a 50-ohm transmission line to the radiating ele-
ment. In mobile installations (cars, trucks, boats, etc.), an
antenna system that is non-directional should be used.
Avertically polarized quarter-length whip antenna pro-
vides the most reliable operation and the greatest range.
The shorter loaded-type whip antennas are more attractive,
compact and adequate for applications where the maxi-
mum possible range is not required. Also the loaded whips
do not present the problems of height imposed by the full
quarter-wavelength whip.
2
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							Temporary Mobile OperationTo operate your COBRAtransceiver from a car on a tempo-
rary basis, you may want to purchase an additional ciga-
rette lighter adapter from your COBRAdealer. This adapter
and a magnetic mount antenna allow you to quickly
install your transceiver for temporary use.OperationControls and IndicatorsRefer to controls, indicators and connectors as illustrated
below:A. Front Panel1.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.
2.Off/On/Volume. Turn clockwise to turn power on and
set the desired listening volume.
3.Squelch. This control is used to cut off or eliminate
receiver background noise in the absence of an incom-
ing signal. For maximum receiver sensitivity, it is
desired that the control be adjusted only to the point
where the receiver background noise or ambient back-
ground noise is eliminated. 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.
4.
CB,WX1, WX2, WX3. CB mode is for normal CB opera-
tion. Switch to WX1, or WX2, or WX3 to find the
Weather VHF Radio Station active in your area.
5.
Channel Up/Down Buttons. When depressed, these
buttons are used to select any one of the forty citizens
band channels desired.
For a RAPID change of channels, depress and holdthe
desired button (up or down). This allows all 40 channels
to be covered in about 6 seconds.
6.
LED Channel Display. The selected channel will be dis-
played.
7.
S/RF Power Meter. Shows relative transmitter RF out-
put 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.
8.
RX/TX Indicator LED. 4 red indicator will light when in
the receivemode. Agreen indicator lights when in receive
mode. When weather channel is selected, the channel
display will be turned off.
9.
SoundTracker™LED. Ared indicator will illuminate
when the SoundTracker system is engaged on your CB. 
10.
Channel 9 Button. Depressing this button provides
instant access to emergency Channel 9. Channel 9 on
display will flash to remind you that the function is acti-
vated.
11.
SoundTracker™ Switch. Depressing this button turns
on the SoundTracker system in your radio.
¥
Automatic Noise Limiter. This is a non-switchable 
feature that is always on to reduce background noise.
3
18 WX ST1
2
3
4
5
6
7
8
9
1011
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							B.   Rear Panel1.
Antenna Connector. This female connector permits
connection of the transmission line cable male connec-
tor to the transceiver.
2.
External Speaker. The External Speaker Jack is used
for remote receiver monitoring. 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 dis-
connected.
3.
Power:This cable is permanently attached to the radio.
If you wish to remove the radio after installation, dis-
connect at fuse holder and ground connector. 
Operating Procedure to Receive1.
Be sure that power cord, antenna and microphone are
connected to the proper connectors before proceeding
further. The weather switch should be in the CB posi-
tion.
2.
Turn the radio ON by rotating the  VOLUME CON-
TROLclockwise.
3.
Rotate SQUELCH CONTROLcounterclockwise until
incoming signal is heard.
4.
Select the desired channel.
5.
Set VOLUME CONTROLto a comfortable listening
level.
6.
Engage the SoundTracker system by depressing the 
button labeled ST.
Listen to the background noise from the speaker. Turn the
SQUELCH CONTROLslowly clockwise until the noise JUST
disappears (no signal should be present). Leave the control at
this setting. The squelch is now properly adjusted. The
receiver will remain quiet until a signal is actually received.
Do not advance the control too far, or some of the weaker
signals will not be heard. The revolutionary SoundTracker
system allows you to reduce unwanted background noise
(static) and increase the signal for better reception.
Operating Procedure to Transmit1.
Select the desired channel.
2.
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 micro-
phone 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. 
4
2
31
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							SOUNDTRACKER SYSTEMWhile previous systems only Òblanked outÓ or limited
noise in higher sound frequencies, the revolutionary new
SoundTracker System actually reduces noise while leaving
the signal intact in the reception mode. In the transmission
mode, it actually strengthens the signal, providing you
with a significant reduction in noise on reception and trans-
mission.Sound clarity is measured by the ratio of the signal
level to the noise level. The higher the signal-to-
noise ratio, the better the sound.
HOW SOUNDTRACKER WORKSOn Reception
–“Cuts Noise Coming In”
With a normal CB, distant signals fall below the squelch
level and are unintelligible. With a SoundTracker CB, the
noise level is cut by up to 90%, which increases the signal-
to-noise ratio and dramatically improves signal clarity. This
also allows you to significantly reduce the squelch level,
which greatly expands your listening range.On Transmission
–“Strengthens Signals Going Out”
ASoundTracker CB strengthens the transmit signal by
more effectively using the available RF power output of the
CB. The result is improved transmission signal clarity and
an expanded transmission range.
5Maintenance and AdjustmentYour COBRACB 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 reli-
ability. Should a failure occur, however, review the follow-
ing, then if necessary, replace parts only with identical parts.
Do not substitute.1.
Check connections to the source of power and make
sure it is the 13.8 VDC required to operate your radio.
2.
Check the fuse in the DC power cord. The main power
lead (red wire) has a 2 amp 3AG type fuse in its holder.
Use only the above specified type and size fuse for max-
imum protection. Failure to do so, will void the warran-
ty.
3.
Make certain the microphone properly plugged in.
4.
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. 
Replacement WarningReplacement 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.
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							AFew Rules That Should Be Obeyed1.
You are not allowed to carry on a conversation with anoth-
er station for more than five minutes at a time without tak-
ing a one-minute break to give others a chance to use the
channel.
2.
You are not allowed to blast others off the air by over-
powering them with illegally amplified transmitter
power or illegally high antennas.
3.
You cant use CB to promote illegal activities.
4.
You are not allowed to use profanity.
5.
You may not play music in your CB.
6.
You may not use your CB to sell merchandise or pro-
fessional service.
Use Channel 9 For Emergency Messages OnlyThe 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-inclu-
sive.
PermittedAtornado sighted six miles of town.
Not PermittedThis is observation post number 10. 
No tornado sighted.
6
Limited Two Year Warranty
COBRAELECTRONICS CORPORATION warrants that its
COBRAcitizens band (CB) radio, and the component parts
thereof, will be free of defects in workmanship and materials
for period of two (2) year from the date of first consumer pur-
chase. This warranty may be enforced by the first consumer
purchaser, provided that the product is utilized within the
U.S.A.
COBRAwill, without charge, repair or replace, at its option,
defective citizens band (CB) products or component parts
upon delivery to the COBRAfactory Service Department, ac-
companied by proof of the date of first consumer purchase,
such as a duplicated copy of a sales receipt.
You must pay any initial shipping charges required to ship
the product for warranty service. The return charges will be
at CobraÕs expense, if the product is repaired or replaced
under warranty. For further details concerning procedures
for obtaining service, see the ÒIf You Need ServiceÓ section of
the OwnerÕs Manual.
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 merchant-
ability and fitness for a particular purpose are limited in
duration to the length of this warranty.
COBRAshall not be liable for any incidental, consequen-
tial or other damages; including, without limitation, dam-
ages 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.
This limited warranty gives you specific legal rights, and
you may also have other rights which vary from state to
state.
Cobra Electronics Corporation, 
6500 W. Cortland Street,  Chicago, IL60707
18.WX.ST.MAN.ORIG.  9/19/97 2:54 PM  Page 6 
						

							7
If You Think You Need Service, Call 773-889-3087
“If your product should require factory service please call
Cobra first before sending your unit in. This will ensure
the fastest turnaround 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.
1.For Warranty Repair, include some form of proof-of-pur-
chase, such as  a mechanical reproduction or carbon or a sales
receipt. If you send the original receipt it cannot be returned.
2.Send the entire product. Must include CB unit and 
microphone. 
3.Enclose a description of what is happening with the unit.
Include a typed or clearly printed name and address of
where the unit is to be  returned.
4.Pack unit securely to prevent damage in transit. If possi-
ble, use the original packing  material.
5.Ship prepaid and insured by way of a traceable carrier  
(to  avoid  loss in transit)  such as United Parcel Service
(UPS), Roadway Parcel Service (RPS) or First Class
Insured Mailto Cobra  Factory  Service,  Cobra
Electronics Corporation, 6500 W. Cortland St., Chicago,
IL60707. Cobra is not responsible for units not received
if package has not been properly insured.
6.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 contact-
ing 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.
For technical assistance, please call our Automated Help Desk which can assist 
you by answering the most frequently asked questions about Cobra products.
(773) 889-3087 
24 hours a day, 7 days a week. 
AConsumer Service Representative can be reached through this same number 
8:00 am - 8:00 pm, Monday through Friday, CST.
Technical assistance is also available on-line in the Frequently 
Asked Question (FAQ) section at www.cobraelec.com 
or by e-mail to [email protected]
NOTES
18.WX.ST.MAN.ORIG.  9/19/97 2:54 PM  Page 7 
						

							ELECTRET CONDENSER MICROPHONE Replacement microphone with 4-pin screw-on connection545-157-N-004$15.00
DC POWER CORD
Exact replacement420-002-N-001$7.00
MOUNTING BRACKET
Exact replacement 250-003-N-001$4.50
MOUNTING BRACKET SCREWS
Exact replacements523-775-9-001$.60 ea
POWER MICROPHONE
Amplified power micCA-75$19.95
POWER/NOISE-CANCELLING MICROPHONE
Amplfied power mic with noise-cancelling designCA-77$39.95
POWER/ECHO MICROPHONE
Amplfied power mic with echo circuitryCA-79$69.95
ATW-400
High performance, dual band, CB and Weather 
magnetic mount antennaATW-400$39.95
ATW-480
High performance, dual band, mirror mount antenna.
Replacement whip. (Cable and bracket not included).ATW-480$29.95
DescriptionPart No.Cost Ea. X  Qty. =  Amount
Make check or money order (no stamps) payable to Cobra Electronics and mail with this order form to:Cobra Accessories Dept.
6500 W.Cortland St.,Chicago,IL 60707
Call 773-889-3087,or fax 773-622-2269 for credit card orders
Allow 4 to 6 weeks for delivery.Offer valid in Continental U.S.only.
Please print clearly:
Name__________________________________________________________________
Address (Not P.O.Box)____________________________________________________
City________________________________State____________Zip________________
Credit Card No.______________________________________Exp.Date____________
Customer Signature__________________________________________
Circle One:
VisaMasterCardDiscover
OPTIONAL ACCESSORIES
You can find these fine accessories at your local Cobra CB dealer.
If you wish, you can order directly from Cobra
Order by phone:
Call 1-773-889-3087 (Press 1 from the main menu) 8a.m.-8p.m. M-F CST. 
Order by mail or fax: Please fill out order form below, and mail/fax directly to Cobra.
Fax to: 
1-773-622-2269
Mail to:
Cobra Accessories Dept.
6500 W. Cortland St.,
Chicago, IL 60707HHIllinois residents add 7%HHCook Co. residents add .75% (7.75% total)HHChicago residents add 1% (8.75% total)HHIndiana residents add 5%HHMichigan residents add 4 %HHOhio residents add 6%HHWisconsin residents add 5%
Amount
(Tax if applicable )  
Shipping/handling         $3.50
Total 
CUT ALONG DOTTED LINE
(Prices subject to change without notice)
18.WX.ST.MAN.ORIG.  9/19/97 2:54 PM  Page 8 
						

							FOLD HERE 
TAPE TOP FLAP OVER THIS PRINTING
6500 West Cortland Street
Chicago, IL 60707
PLACE 
STAMP 
HERE
Printed in Thailand            ©Cobra Electronics  Corporation 1997             480-183-P-001
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