This patent-pending technology dramatically
improves transmission and reception of CB
signals.
The revolutionary SoundTrackerTMSystem reconfigures the transmission signal,allowing it to be
transferred more efficiently through cluttered airwaves.
TM
Cobra on the World Wide Web:
Frequently Asked Questions
(FAQ) can be found on-line at:
www.cobraelec.com
At the same time,it significantly reduces the
amount of static on all incoming CB signals.
The end result is a cleaner,clearer reception of
signals and a more powerful transmission which
dramatically improve CB communications.
A3
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Controls and Indicators
1. 4 - Pin Mi c ro p h o n eCo n n e cto r
2. Power On/Off/Volume
3. Squelch
4. Tone Control
5. RF Gain
6. Band Selector
7. Channel Selector
8. LED Channel Display
9 Sound Tracker™ LED
1 0 . RX (Receive)/ TX (Transmit)
This patent-pending technology dramatically
improves transmission and reception of CB
signals.
The revolutionary SoundTrackerTMSystem reconfigures the transmission signal,allowing it to be
transferred more efficiently through cluttered airwaves.
9
8
At the same time,it significantly reduces the
amount of static on all incoming CB signals.
The end result is a cleaner,clearer reception of
signals and a more powerful transmission which
7
dramatically improve CB communications.
Cobra on the World Wide Web:
Frequently Asked Questions
(FAQ) can be found on-line at:
www.cobraelec.com
Rear Panel
1 8 . Public Address Speaker Jack
1 9 . External Speaker Jack
2 0 . Antenna Connector
2 1. Power Jack
A licence is required for
use in the UK.CB licensing applications can be
obtained from The Radio
Licensing Centre,P.O.
Box 885,Bristol,BS99
5LG,UK or contact your
local CB dealer for
additional information.
1
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InstallationInstallation
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 and
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 inte rfe re with the dri ver 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.
cb transceiver
3
Connect the antenna cable plug to the receptacle marked “ANT” on the back of the unit.
2
Drill the holes and secure the bracket.
continued
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Note
Before installing the CB radio,
visually check the vehicle’s
battery connection to determine which terminal,positive
or negative,is earthed to the
engine block (or chassis).A
negatively earthed vehicle
has its negative lead earthed
to the chassis.
Note
Connecting to a fuse circuit
controlled by the ignition switch
prevents the unit from being left
on accidentally,and also
permits operating the unit
without running the engine.
Note
In positive earth vehicles the red
wire goes to the chassis and the
black wire is connected to the
ignition switch.
4
In a negative earthed 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.
6
Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.
7
Mount the microphone
bracket on the side of the
unit (nearer the driver)
using two screws supplied.Bracket should be
placed under the dash
so that microphone is
readily accessible.
InstallationInstallation
8
Attach the 4-pin microphone cable to receptacle on front of unit and Install unit in bracket
securely.
54
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Ignition Noise InterferenceAntennas
CB Antenna
Note
For optimum performance in
passenger cars the ideal antenna location is on the centre of
the roof.Second choice is on the
centre of the boot.
Note
Antenna bracket must be earthed to the chassis of the vehicle.
CB Antenna
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.
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 an earth plate,(unless it
has a steel hull).Before attempting installation ,
consult your dealer for information regarding an
adequate earthing system and prevention of
electrolysis between fittings in the hull and water.
Use of a mobile receiver at low signal levels is
normally limited by the presence of electrical
noise.The primary source of noise in cars is from
the alternator and the 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 UK 25 LTD ST 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.
6
7
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UK25LTDST-UK/English.qx 6/22/99 8:41 AM Page 8
Operation
Turning OnSetting Channel
Turning On
Make sure the power cord,antenna and micro-
phone are connected to their proper connectors
before starting.
1
The CB/PA button should be in the
CB position.
Setting Channel Selector
1
Selectone of forty channels and adjust
volume.The selected channel is indicated by
the LED readout directly above the channel
selector knob
Operation
Selector
Setting Band Mode Selector
Setting Band
Mode Selector
2
Ro t ate the On/Off Volume knob c l oc kw i s eto
a normal listening level.
8
1
To operate in UK band,set control toUK, to
operate in EU band,set to EU.
9
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UK25LTDST-UK/English.qx 6/22/99 8:41 AM Page 10
Operation
To Receive
Selecting A
Channel
Note
Switch to 9 or 19 (Information)
for instant access to these
channels.
To Receive
1
Rotate the On/Off Volume knob clockwise.
The green RT/TX LED will be illuminated.
Selecting A Channel
S-Meter
Swings proportionately to strength of incoming
signal when receiving.
Operation
S-Meter
1
SwitchtoNOR to select desired channel.
10
11
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UK25LTDST-UK/English.qx 6/22/99 8:41 AM Page 12
OperationOperation
Note
SoundTracker™ gives you
clearer,cleaner reception to
improve CB communications
while on the air.
The SoundTrackerTMSystem
While previous systems only “blanket out”or limit
noise in higher sound frequencies,the revolutionary new SoundTrackerTMSystem 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 transmission.
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 SoundTrackerTMWorks
On Reception - “Cuts noise coming in”
With a normal CB,distant signals fall below
the squelch level and are unintelligible.With a
SoundTrackerTMCB,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 reduce the squelch level significantly,which greatly expands your listening range.
OnTransmission - “Strengthens signals going out”
A SoundTrackerTMCB 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.
Activating SoundTracker™
1
Push and release the ST button.Red LED
is illuminated when SoundTracker™ is
turned on.
Activating
SoundTracker
™
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OperationOperation
NB/ANL, ANL,
OFF (Noise
B l a n k e r, Automatic
Noise Limiter
Switch
Note
The RF noise blanker is very
effective in reducing repetitive
noises such as ignition interference.
NB/ANL,ANL,Off Switch
1
When switched to NB/ANL position the RF
Noise Blanker and Automatic Noise Limiter is
activated,providing increased noise filtration.
2
When switched to the ANL the Automatic
Noise Limiter is activated.This helps reduce
noise created by the vehicle’s electronics.
When switched to OFF position Noise
Blanking and the Automatic Noise Limiting
Filtration will be turned off.
Bright/Mid/Dim Switch
1
Switch to BRT,MID or DIM to control bright-
ness of the channel indicator and multi-function meter for day or nighttime driving.
RF Gain Control
The RF Gain is used to optimize reception in
strong or weak signal areas.
Bright/Mid/Dim
Switch
RF Gain Control
Note
The RF Gain is used to optimize
reception in weak signal areas.
1
Rotate the RF Gain knob anticlockwise to
reduce gain in strong signal areas.In weak
signal areas turn clockwiseto increase gain.
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OperationOperation
Setting Squelch
Gate closed
Gate open
Setting Squelch
Squelch is the “control gate”for incoming signals.
1
Full clockwise rotation closes the “gate”
allowing only very strong signals to enter.
2
Full anticlockwise rotation opens the “gate”
allowing all signals in.
3
To achieve the Desired Squelch Setting (DSS),
turn the Squelch control anticlockwise until
you hear noise. Now turn the control clockwise
until the noise just stops. This is the DSS setting.
Gate set to Desired
Squelch Setting (DSS)
1716
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OperationOperation
To Transmit
Caution!
Be sure the antenna is properly
connected to the radio before
transmitting.Prolonged transmitting without an antenna,or
with a poorly matched antenna,
can cause damage to the transmitter.
1
Select desired channel.
Setting Tone ControlToTransmit
1
Tone Control is used to set the desirable
tone level of received audio signals.
Setting Tone
Control
18
19
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UK25LTDST-UK/English.qx 6/22/99 8:41 AM Page 20
OperationOperation
Transmit
RF Meter
Transmit
1
Push and hold microphone button to transmit.
Transmitter is now activated.When transmitting,hold the microphone two inches from
your mouth and speak in a clear,normal voice.
Release to receive.
RF Meter
This meter swings proportionately to the RF
output (outgoing signal) while transmitting.
External Speaker
The external Speaker jack is used for remote
receiver monitoring.
1
Connect an external speaker to the external
speaker jack on the rear panel.
External Speaker
Note
The external speaker should
have 8-ohm impedance and be
rated to handle at least 4 watts.
When the external speaker is
plugged in,the internal speaker
is automatically disconnected.
Note
Cobra external speakers are
rated at 10 watts.
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UK25LTDST-UK/English.qx 6/22/99 8:41 AM Page 22
OperationOperation
PA (Public
Address)
Note
Speaker should have 8-ohm
impedance and be rated to
handle at least 4 watts.
Note
The speaker should be directed
away from the microphone to
prevent acoustic feedback.
Note
Adjust volume control to normal listening level.Activity on
the CB channel will be heard
through the PA speaker.
PA (Public Address)
1
Connect an external PA speaker to the PA jack
on the rear panel.
2
Set CB/PA switch to PA position.
3
Push and hold microphone button and speak
in a normal voice.Your voice will sound on the
PA speaker.
22
23
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UK25LTDST-UK/English.qx 6/22/99 8:41 AM Page 24
Home And Office Set-UpTemporary Mobile Set-Up
Temporary
Mobile Set-Up
Temporary Mobile Operation
For temporary mobile operation you may want to
purchase an optional cigarette lighter adapter
from your COBRA dealer.This adapter and a magnetic mount antenna allow you to“install”your
transceiver quickly for temporary use.
Base Station Operation
(From 220/240V AC Domestic Current)
To operate your transceiver from home or office
you will need a 13.8 volt DC Power Pack rated at a
minimum of 2 amps,and a properly installed base
station antenna.
1
Connect the red (+) and black (-)
leads of the transceiver to the corresponding
terminals of the power pack.
Base Station
Operation
(From 220/240V
AC Domestic
Current)
Warning!
Do not attempt to operate this
transceiver by connecting it
directly to 220/240 V AC.
24
2
Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.
3
Connect properly installed and matched base
station antenna.
25
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UK25LTDST-UK/English.qx 6/22/99 8:41 AM Page 26
How Your CB Can Serve YouHow Your CB Can Serve You
A Few Rules
You Should
Know
• Warn of traffic delays ahead
• Provide weather and road information
• Provide help in an emergency
• Provide direct contact (subject to
conditions) with home or office
• Get local information to find destination
• Let you communicate with family and friends
• Suggest spots to eat and sleep
• Keep you alert while travelling
A Few Rules You Should Know
A. Co nve r s ations should not last more than 5 min-
u te s with another station. A one minute break
should be taken to let others use the channel.
B. You should not blast others off the air by use
of illegally amplified transmitters or illegally
high antennas.
C. You should not use the CB to promote illegal
activities.
D. Bad language should not be used.
Local Laws or Regulations
The use of this CB product involves the public airways and its use may be subject to
local laws or regulations.Before using the
product you should check to see that the
contemplated use does not violate any
applicable local law or regulation.
Local Laws or
Regulations
E. You should not transmit music with a CB.
F. You should not use your CB to sell
merchandise or professional services.
2726
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How Your CB Can Serve YouHow Your CB Can Serve You
CB 10-Codes
CB 10-Codes
Citizen Bands have adopted the “10-CODES”for
standard questions and answers. These codes
p rovide quick and easy co m m u n i cat i o n ,e s pe c i a l l y
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 air
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/road conditions
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 information
10-27 Moving to channel
10-28 Identify your station
Code Meaning
10-29 Time is up for contact
10-30 Does not conform
10-33 Emergency traffic
10-34 Trouble at this station
10-35 Confidential information
10-36 Correct time is
10-37 Breakdown truck needed at
10-38 Ambulance needed
10-39 Message delivered
10-41 Turn to channel
10-42 Traffic accident at
10-43 Traffic delay 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
2928
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UK 25 LTD ST SpecificationsFrequency Ranges
The CO B RA UK 25 LTD ST tra n s ce i ver re p re s e nts one of the most adva n ced FM two way ra d i o s.This unit fe at u res adva n ced Phase Lock Loop (PLL) circ u i t ry prov i d i n g
co m p l e te cove rage of all 40 CEPT and UK FM CB channels.
CEPT FrequenciesUK Frequencies
Channel Channel
CBFreq.CB Freq.
Channel In MHzChannel In MHz