How to Use Your Cobra 25 LX
Contents
Features .........................................................................................................1
The CB Story .................................................................................................A1
FCC Regulations, FCC Warnings & Included Accessories
Controls & Indicators ................................................................................A2
Our Thanks to You .....................................................................................A3
Customer Support
Installation
Location & Mounting/Connection ..................................................2
Antennas
CB Antenna & Marine Installation ...................................................6
Ignition Noise Interference....................................................................7
Operating Your 25 LX
Turning On Your CB ..............................................................................8
Setting Channel Selector .................................................................... 9
To Receive ................................................................................................ 10
Selecting a Channel .............................................................................. 10
S-Meter ...................................................................................................... 11
To Transmit .............................................................................................. 12
Setting Dynamike® ...............................................................................13
Menu Mode .............................................................................................14
Setting the Clock ...................................................................................15
Setting the Alarm ..................................................................................15
Setting the Count Down Timer ........................................................ 16
Setting Display Color Mode ...............................................................17
Setting Brightness Mode .................................................................... 18
Setting Contrast Mode ........................................................................18
Key Tones Mode ....................................................................................19
Radio Check Mode ................................................................................ 19
Software Version/Factory Settings .................................................20
NB/Off (Noise Blanker/Automatic ...................................................21
Noise Limiter Switch)
RF Gain Control ......................................................................................21
Program Memory Channels ...............................................................22
Scan CB Channels .................................................................................. 23
Scan/Memory Scan ............................................................................... 23
Scan Memory Channels ......................................................................23
Dimmer Control ..................................................................................... 23
Setting Squelch ...................................................................................... 24
S/RF Meter ................................................................................................26
External Speaker .................................................................................... 27
PA (Public Address) ...............................................................................28
Home And Office Set-Up .................................................................... 30
Temporary Mobile Set-Up ..................................................................31
How Your CB Can Serve You ................................................................. 32
A Few Rules You Should Know ........................................................32
Channel 9 Emergency Messages .....................................................32
CB 10 Codes .............................................................................................34
Frequency Ranges ..................................................................................... 36
25 LX Specifications ..................................................................................37
Warranty Information ..............................................................................38
Optional Accessories ................................................................................ 39
If You Need Service/Trademark Info ................................Back Cover
Features of This Product
• Selectable 4-Color LCD Display
• 40 CB Radio Channels
• 40 Channel Scan
• Memory Channels
• Channel Frequency Read-Out
• Radio Check Diagnostic
• Clock/Timer/Alarm
• 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
• Adjustable Dynamike Boost
• Tactile Controls
• 9 Ft Mic Cord
• Programmable Dimmer Control
• RF Gain
1
Installation
Installation
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.
3
Connect the antenna cable plug to the recep-
tacle marked “ANT” on the back of the unit.
2
Drill the holes and secure the bracket.
continued
32
Installation
1
2
3
4
TX PWR
TX
RX
DYNAMIKE
MIN
RF GAIN
MAX
SCAN / M SCAN
DIM / ESC
CB / PA
CH9 / 19
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 the radio to an
accessory fuse prevents the unit
from being left on accidentally,
and also permits operating the
unit without running the engine.
Note
The radio should be connected
to a constant 12V source to
maintain the time when the
radio is turned off.
Note
When connected to an
accessory fuse, unit will self test
automatically when ignition
is turned on. Turns itself on & off.
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.
6
Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.
7
Mount the microphone
bracket on either side
of the unit (driver’s left)
using two screws supplied. Bracket should be
placed under the dash
so microphone is readily
accessible.
NB
8
Attach the 4-pin microphone cable to
SIG +30dB
VOL SQ
OFF
S
H
U
P
E
N
U
T
N
E
E
M
R
5
3
7
9
1
receptacle on front of unit and install unit
in bracket securely.
MEM NB
MIN
Installation
Note
If microphone is not
connected, audio will not
be heard at speaker.
54
Antennas
Ignition Noise Interference
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 773889-3087 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. For models with Weather Feature (WX),
a Dual Band (Center Load/Base Load) antenna
is recommended. 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.
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 LX 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
Operation
+30dB
PWR
MEM NB
TX
RX
VOL SQ
DYNAMIKE
RF GAIN
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
1
2
3
4
TX PWR
3
5
7
9
TX
RX
DYNAMIKE
MIN
MAX
SCAN / M SCAN
DIM / ESC
1
2
3
4
TX PWR
NB
TX
RX
DYNAMIKE
MIN
RF GAIN
MIN MAX
SCAN / M SCAN
DIM / ESC
Operation
Turning On
Turning On
Make sure the power cord, antenna and microphone are connected to their proper connectors
before starting.
5
3
7
VOL SQ
9
S
H
U
P
U
N
E
M
MEM
E
N
T
E
R
1
SIG +30dB
OFF
Setting Channel Selector
1
VOL SQ
OFF
3
Select one of forty channels and adjust
volume. The selected channel (1 through
+30dB
S
H
U
P
U
N
E
M
MEM NB
E
N
T
E
R
MIN
RF GAIN
Setting Channel
Selector
Note
Press CB/PA to select CB or PA
(public address) mode.
40) will be indicated by the readout directly
above the channel selector knob
1
Rotate the On/Off Volume knob clockwise to
turn unit on and adjust to a normal listening
level.
CH9 / 19
CB / PA
NB
2
Press the CB/PA button to change modes.
8
SIG
1
2
1
3
3
5
4
TX
7
9
9
Operation
1
1
2
3
4
TX PWR
3
5
7
9
MEM NB
TX
RX
DYNAMIKE
MIN
RF GAIN
MIN MAX
SCAN / M SCAN
DIM / ESC
1
2
3
4
TX PWR
TX
RX
DYNAMIKE
MIN
SCAN / M SCAN
DIM / ESC
MEM NB
DYNAMIKE
RF GAIN
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
Operation
To Receive
Selecting A
Channel
To Receive
SIG +30dB
U
N
E
VOL SQ
OFF
1
Rotate the On/Off Volume knob clockwise.
M
The RX icon will be displayed.
Selecting A Channel
5
3
7
9
+30dB
VOL SQ
Unit should be in CB mode. Rotate channel
S
H
U
P
U
N
E
M
selector clockwide or counter-clockwise to
select desired channel.
E
N
T
E
R
MEM NB
MIN MAX
1
OFF
1
S
U
P
RF GAIN
H
E
N
T
E
R
S-Meter
Swings proportionately to strength of incoming
signal when receiving.
3
2
4
5
3
7
VOL SQ
TX PWR
9
TX
RX
1
1
SIG +30dB
S-Meter
S
U
P
U
N
E
M
10
11
Operation
1
2
3
4
TX PWR
TX
RX
DYNAMIKE
MIN
MAX
SCAN / M SCAN
DIM / ESC
SCAN / M SCAN
Operation
To Transmit
Caution!
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.
Be sure to read the F.C.C. Rules
and Regulations included with
this unit before transmitting.
To Transmit
5
3
7
9
+30dB
VOL SQ
1
Select desired channel.
M
Transmit
PUSH &
HOLD
N
E
P
U
S
H
U
E
N
T
E
R
MEM NB
MIN
RF GAIN
Setting Dynamike®
This controls the microphone sensitivity
(outgoing audio level).
DIM / ESC
S
H
3
Initially, set fully clockwise so that maximum
MEM NB
E
N
T
E
R
RF GAIN
MIN MAX
DYNAMIKE
MIN
voice volume is available. Dynamike may
have to be reduced in some conditions.
Setting
Dynamike
®
2
Push and hold mic 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.
12
13
Operation
SIG +30dB
1
1
2
3
4
TX PWR
3
5
7
9
MEM NB
TX
RX
DYNAMIKE
SCAN / M SCAN
DIM / ESC
1
1
2
3
4
TX PWR
3
5
7
9
MEM NB
TX
RX
DYNAMIKE
MIN
SCAN / M SCAN
DIM / ESC
ESC
MEM SCAN
CH 9/
19
CB/ WX/
DIM
SCAN
PA
SCAN / M SCAN
DIM / ESC
ESC
MEM SCAN
CH 9/
19
CB/ WX/
DIM
SCAN
PA
SCAN / M SCAN
DIM / ESC
Operation
Menu Mode
Note
Use Dim/Escape button to exit
from any routine back to CB
standby mode.
Menu Mode
Used to program special features. Menu/Enter
knob is used to move cursor to desired feature
to program.
S
H
U
P
E
N
U
T
N
E
VOL SQ
OFF
M
Rotate Menu/Enter knob clockwise to navigate
menu levels.
E
VOL SQ
OFF
M
Press Menu/Enter knob to select feature to be
programmed.
Level 1: Level 2:
SET CLOCK
ALARM CLOCK
SET COUNT DOWN
Level 3: Level 4:
14
KEY TONES
RADIO CHECK
SETTING
E
S
H
U
P
E
N
U
N
T
DISPLAY COLOR
BRIGHTNESS
CONTRAST
R
E
R
EXIT
RF GAIN
MIN MAX
RF GAIN
MIN MAX
MIN
Setting the Clock
Using the clock, alarm and countdown functions.
To set the clock, press Menu/Enter knob and
select Set Clock.
SET CLOCK
ALARM CLOCK
SET COUNT DOWN
12:00 PM will appear in the display and the hours
will flash. Rotate Menu/Enter knob clockwise to
select desired hour and press to set.
The minutes will then flash. Rotate Menu/Enter knob
again to select desired minutes and press to set.
Once the minutes are set, AM or PM will then
flash. Rotate Menu/Enter knob again to select AM
or PM and press to set or scroll down to EXIT and
press to return to main menu.
Setting the Alarm
Your 25 LX can be utilized as an alarm clock.
To set the alarm, press Menu/Enter knob and
select Set Alarm.
Rotate Menu/Enter knob clockwise to select Set
Alarm Time. Follow instructions above for setting
the alarm time and AM or PM.
Setting the
Clock
Note
Normal display will appear if
clock has not yet been set.
Note
Use Dim/Escape button to exit
from any routine back to CB
standby mode.
Note
The radio should be connected
to a constant 12V source to
maintain the time when the
radio is turned off.
Setting the
Alarm
15
Operation
ESC
MEM SCAN
CH 9/
19
CB/ WX/
DIM
SCAN
PA
SCAN / M SCAN
DIM / ESC
1
1
2
3
4
TX PWR
3
5
7
9
MEM NB
TX
RX
DYNAMIKE
MIN
U
S
SCAN / M SCAN
DIM / ESC
SCAN / M SCAN
DIM / ESC
1
1
2
3
4
TX PWR
3
5
7
9
MEM NB
TX
RX
DYNAMIKE
MIN
SCAN / M SCAN
DIM / ESC
Operation
Setting the
Alarm continued
Note
Default snooze time length
is 10 minutes.
Note
Press Dim/Escape button to
return to CB standby mode.
Note
Default alarm length
is 60 seconds and is set in
10 second increments.
Setting the
Count Down
Timer
Note
Press Dim/Escape button to
return to CB standby mode.
Once alarm settings are complete, rotate Menu/Enter
knob clockwise to Set Snooze and press to select.
EXIT
SET SNOOZE
ALARM LENGTH
Enter desired snooze time (from 1 to 60 minutes).
Select Enter to exit, return to Set Snooze or Alarm
Length. Select Alarm Length to set alarm duration
(from 10 to 300 seconds). Pressing Menu/Enter
knob returns unit to exit, Set Snooze or Alarm
Length.
Setting the Count Down Timer
To set the count down timer, press Menu/Enter
knob and select Set Count Down.
Follow instructions in Setting the Clock section
(page 17) to set count down hour and
minutes. Once desired count down time is
selected, press Menu/Enter knob again to set
and return to the standby menu.
16
Setting Display Color Mode
H
P
E
N
U
N
1
VOL SQ
OFF
E
M
T
E
R
RF GAIN
MIN MAX
Press Menu/Enter knob and scroll down to select
Display Color.
2
TX
DISPLAY COLOR
BRIGHTNESS
Press and release Menu/Enter to set the color.
S
H
U
P
E
N
U
N
E
3
VOL SQ
OFF
M
T
E
R
RF GAIN
MIN MAX
Rotating Menu/Enter knob clockwise changes the
display color from green to blue to amber to red
then back to green.
4
TX
TURN CH KNOB TO
SET COLOR
EXIT
Press Menu/Enter knob or escape button again
to exit routine.
Setting Display
Color Mode
Note
Select EXIT to return to
main menu. Press Dim/
Escape button to return to
CB mode.
17
Operation
SCAN / M SCAN
DIM / ESC
SCAN / M SCAN
DIM / ESC
SCAN / M SCAN
DIM / ESC
SCAN / M SCAN
DIM / ESC
M SCAN
Operation
Setting
Brightness
Mode
Note
If an attempt is made to
exceed the highest or lowest
brightness levels, 1 error beep
will be heard.
Note
Exit will return to menu mode.
ESC will exit and return to CB
Standby.
Note
To select day or night levels,
press and release Dim/Escape
button once levels are set.
Note
To toggle from day to night
settings, see page 27.
Setting
Contrast Mode
Note
If an attempt is made to
exceed the highest or lowest
contrast levels, 1 error beep will
be heard.
Setting Brightness Mode
Press Menu/Enter knob to select Set Brightness
SET BRIGHTNESS
DAY-BRIGHT
NIGHT-DIM
Rotate Menu/Enter knob clockwise to Select
Brightness. Press Menu/Enter knob to select
Day-Bright. Turn Menu/Enter clockwise to
increase brightness and turn counter-clockwise to
decrease brightness.
SET BRIGHTNESS
DAY-BRIGHT
NIGHT-DIM
To set the day bright level, turn the Menu/Enter
knob clockwise to a desired setting and then
press Menu/Enter. To set the Night-Dim level,
repeat instructions above then select Night-Dim.
TURN CH KNOB TO
SET LEVEL
EXIT
Press Menu/Enter knob again to exit routine.
Setting Contrast Mode
Press Menu/Enter knob and rotate clockwise to
select Set Contrast. Press Menu/Enter knob
again and rotate clockwise to increase contrast,
counter-clockwise to decrease contrast.
Press Menu/Enter knob to set contrast.
TURN CH KNOB TO
SET CONTRAST
Press Menu/Enter knob again to exit routine.
Key Tones Mode On and Off
Press Menu/Enter knob and rotate clockwise
to Set Key Tones. Press Menu/Enter to set Key
Tones On/Off.
Press Menu/Enter knob to select On/Off and
exit to main menu.
Radio Check Mode
Allows testing of important radio functions.
Test 1- Battery Level: Confirms that battery
voltage level is between 10.8 V to 15.8 V. If in that
range, it is “PASS”. Outside of that range, either
FAIL LOW” or “FAIL HIGH” will be displayed. Press
Menu/Enter knob to advance to next test.
1
2
BATTERY VOLTAGE
FAIL HIGH
Test 2- RF Power Output: Confirms 3.3 to 4 Watt
output level. Once Push-to-Talk button is pressed,
Pass or Fail will be displayed if level is outside limits.
1
TX
RX
PRESS PTT
TO CHECK
POWER OUTPUT
2
RF POWER OUTPUT
PASS
3
BATTERY VOLTAGE
FAIL LOW
3
RF POWER OUTPUT
FAIL
SCAN /
DIM / ESC
Key Tones
Mode
Note
Press Dim/Escape
button to return to CB mode.
Radio Check
Mode
Note
Press Dim/Escape button to
return to CB standby mode.
If 10 seconds pass or if Enter
button pressed, unit goes to
2nd test.
Note
Press Push-To-Talk within 10
seconds or unit will go to the
next test.
Note
Press Dim/Escape button to
return to CB standby mode. If
10 seconds pass or if Enter button
pressed, go to 3rd test.
Note
Press Dim/Escape button to
return to CB standby mode.
If 10 seconds pass or if Enter
button pressed, testing is
complete. Unit will return to
CB Standby mode.
19
Operation
+30dB
PWR
MEM NB
TX
RX
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
M
SCAN / M SCAN
Operation
Software
Version/Factory
Settings
Note
Default display color is green.
Software Version/Factory Settings
Displays current software version and returns
unit to original factory settings. To view software
version, rotate Menu/Enter knob clockwise to
select Setting then Software Version.
CONTRAST
RADIO CHECK
SETTING
SOFTWARE VER
GO TO DEFAULT
To restore default settings, Press Menu/Enter
knob again. Rotate Menu/Enter knob clockwise
to select Setting then Go To Default.
SOFTWARE VER
GO TO DEFAULT
RESTORE DEFAULT
YES
NO
Press Menu/Enter knob to restore default
settings. Choose NO to maintain present
setting with no change.
NB/OFF Button
CH9 / 19
CB / PA
1
NB
1
When switched to NB mode the RF Noise
SIG
Blanker is activated, providing increased
noise filtration.
When switched to OFF mode all noise
filtration will be turned off.
3
2
1
5
3
RF Gain Control
The RF Gain is used to optimize reception in
strong or weak signal areas.
DIM / ESC
E
N
T
E
R
MEM NB
RF GAIN
MIN MAX
DYNAMIKE
MIN
S
H
U
P
U
N
E
1
Rotate the RF Gain knob counterclockwise to
reduce gain in strong signal areas. In weak
signal areas turn clockwise to increase gain.
NB OFF Button
Note
4
TX
The RF noise blanker is very
effective in reducing repetitive noises such as ignition
7
9
interference.
RF Gain Control
Note
The RF Gain is used to optimize
reception in weak signal areas.
2120
Operation
SCAN / M SCAN
SCAN / M SCAN
Operation
Program Memory
Channels
Note
The radio should be
squelched before scan
features are activated.
Note
Keying the microphone will
stop the scan feature.
Note
If more than 10 channels are
attempted to be programmed,
3 error beeps will be heard and
“Memory Full” will be displayed
for 10 seconds or until any
button is pushed.
Note
To remove a channel from
memory, go to the unwanted
memory channel then press
and hold the scan button until
the MEM icon turns off.
Program Memory Channels
Set first channel. Press and hold Scan/MemScan
button. Memory icon will appear. Select second
channel, press and hold Scan/MemScan button
again until Memory icon appears. Repeat above
steps to enter up to 10 channels in memory.
SCAN / M SCAN
DIM / ESC
MEM
SCAN / M SCAN
DIM / ESC
MEM
Pressing the Scan/Memory Scan button
1
toggles from Off to Scan All Channels to
Memory Channel Only Scan and back to Off.
Scan CB Channels
To scan all 40 CB channels, the unit must be
squelched. Press and release Scan/Mem Scan
button once.
SCAN / M SCAN
CB SCAN
27.405
Scan Memory Channels
To scan memory channels, press and release
Scan/Mem Scan button twice.
DIM / ESC
SCAN / M SCAN
CB MEM SCAN
27.405
Dimmer Control
DIM / ESC
DIM / ESC
Scan CB
Channels
Scan Memory
Channels
Dimmer Control
2
DIM / ESC
MEM
RF GAIN
DYNAMIKE
Press Dim/Escape button to end Scan and
return to CB mode.
MEM
E
R
1
Press Dim/Esc button to toggle between day
RF GAIN
DYNAMIKE
and night settings.
See setting instructions on page 20.
2322
Operation
NOISE
WEAK SIGNALS
MEDIUM SIGNALS
STRONG SIGNALS
GATE CLOSED
SIG +30dB
1
1
2
3
4
TX PWR
3
5
7
9
MEM NB
TX
RX
DYNAMIKE
MIN
RF GAIN
MIN MAX
S
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
SIG +30dB
1
1
2
3
4
TX PWR
3
5
7
9
MEM NB
TX
RX
DYNAMIKE
MIN
RF GAIN
MIN MAX
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
SIG +30dB
1
1
2
3
4
TX PWR
3
5
7
9
MEM NB
TX
RX
DYNAMIKE
MIN
RF GAIN
MIN MAX
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
Setting Squelch
Gate closed
Gate open
STRONG SIGNALS
STRONG SIGNALS
STRONG SIGNALS
MEDIUM SIGNALS
MEDIUM SIGNALS
MEDIUM SIGNALS
WEAK SIGNALS
WEAK SIGNALS
WEAK SIGNALS
NOISE
NOISE
NOISE
Setting Squelch
Squelch is the “control gate” for incoming signals.
H
U
P
U
N
E
VOL SQ
OFF
1
Full clockwise rotation closes the gate
allowing only very strong signals to enter.
VOL SQ
OFF
2
Full counterclockwise rotation opens the “gate”
allowing all signals in.
M
U
N
E
M
S
U
P
VOL SQ
OFF
3
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
S
U
P
U
N
E
M
Setting Squelch
Gate set to Desired
Squelch Setting (DSS)
STRONG SIGNALS
MEDIUM SIGNALS
WEAK SIGNALS
NOISE
GATE
GATE
OPEN
24
25
Operation
MEM NB
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
Operation
S/RF Meter
S/RF Meter
This meter swings proportionately to the
RF output (outgoing signal) and incoming
receive signal.
3
2
1
1
SIG +30dB
4
TX PWR
RX
5
3
7
9
TX
External Speaker
External Speaker
The external speaker jack is used for remote
receiver monitoring.
Note
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. See accessory page 43.
U
N
E
M
1
Connect an external speaker to the external
speaker jack on the rear panel.
Note
Cobra external speakers are
rated at 10 watts.
26
27
Operation
MEM NB
DYNAMIKE
RF GAIN
N
T
E
R
SCAN / M SCAN
DIM / ESC
SCAN / M SCAN
DIM / ESC
Operation
PA (Public
Address)
Note
Speaker should have 8-ohm
impedance and be rated to
handle at least 4.0 watts.
Note
The speaker should be directed
away from the microphone to
prevent acoustic feedback.
Note
Activity on the CB channel will
be heard through the PA speaker. Adjust Volume Control to a
normal listening level.
PA (Public Address)
1
Connect an external PA speaker to the PA jack
on the rear panel.
CH9 / 19
CB / PA
NB
2
Press CB/PA button to select PA.
SIG +30dB
1
3
1
VOL SQ
3
2
4
TX PWR
TX
RX
5
7
9
U
N
E
M
PUSH &
HOLD
3
Push and hold microphone button and speak
in a normal voice. Your voice will now transmit
on the PA speaker.
RF GAIN
S
H
U
P
E
MAX
DYNAMIKE
MIN
28
4
Adjust PA speaker volume with the
Dynamike® control.
29
Home And Office Set-Up
Temporary Mobile Set-Up
Base Station
Operation
(From 120V AC
House Current)
Warning!
Do not attempt to operate this
transceiver by connecting it
directly to 120V AC.
Note
For further information call
Cobra Customer Service
1.773.889.3087.
Base Station Operation
(From 120V AC House Current)
To operate your transceiver from home or office
you will need a 13.2 volt DC Power Pack rated at
a minimum of 2 amps, and a properly installed
base station antenna.
1
Simply connect the red (+) and black (-)
leads of the transceiver to the corresponding
terminals of the power pack.
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.
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 quickly
“install” your transceiver for temporary use.
Temporary
Mobile Set-Up
3130
How Your CB Can Serve You
How Your CB Can Serve You
A Few Rules
You Should
Know
Channel 9
Emergency
Messages
Note
If no response on channel 9,
try channels 19 or 14.
• Warnoftrafficproblems
• Provideweatherandroaddata
• Providehelpineventofanemergency
• Providedirectcontactwithhomeoroffice
• Assistpolicebyreportingerraticdrivers
• Get“localinformation”tofinddestination
• Communicatewithfamilyandfriends
• Suggestspotstoeatandsleep
• Keepyoualertwhiletraveling
A Few Rules You Should Know
A. Conversations cannot last more than 5 minutes
with another station. A one minute break is
required to let others use the channel.
B. You cannot blast others off the air by use of
illegally amplified transmitters or illegally
high antennas.
C. You cannot use CB to promote illegal activities.
D. Profanity is not allowed.
E. You may not transmit music with a CB.
F. Selling of merchandise and/or services is
prohibited.
1. Set to channel 9 for emergencies
Be sure antenna is properly connected.
2. 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 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.”
Yes “Weather Bureau has issued
thunderstorm warning.
Bring sailboat into port.”
No “Attention motorists.
Weather Bureau advises snow
tomorrow will accumulate
4 to 6 inches.”
Yes “Fire in building at 539 Main,
Evanston.”
No “Halloween patrol number 3.
All quiet.”
3332
How Your CB Can Serve You
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
10-28 Identify your station
Code Meaning
10-25 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
3534
Frequency Ranges
The Cobra 25 LX transceiver represents one of the
most ad vanced 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 cov er age of all 40 CB chan nels.
Channel Channel
CB Freq. CB Freq.
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 25 27.255
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
25 LX 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 TEMPERATURE
RANGE -30° C TO + 50° C
MICROPHONE Plug-in dynamic
INPUT VOLTAGE 13.2VDC nom. (positive or negative ground)
Current Drain Transmit: AM full mod., 1.5A (maximum)
Receive: Squelched, 0.3A;
full audio output, 1.2A (nominal)
Size ..............................................................8-5/8” D x 6-3/8” W x 2-3/16” H
Weight ..........................................................4 lbs.
Antenna Connector .................................UHF; SO-239
Meter .............................................................Indicates relative
power output 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 10 dB (S+N) /N
Selectivity ....................................................6 dB @ 7 KHz, 60 dB @ 10KHz
Image Rejection ........................................80 dB, typical
Adjacent-Channel Rejection ................60 dB, typical
IF Frequencies ...........................................Double Conversion: 1st: 10.695 MHz
2nd: 455 KHz
Automatic Gain Control (AGC) ............Less than 10 dB change in audio
output for inputs from 10 to 50,000
microvolts
RF Gain range ............................................40 db
Noise Blanker .............................................RF type
Squelch ........................................................Adjustable; threshold less than 1µV
Audio Output Power ...............................4 watts
Frequency Response ...............................300 to 3000 Hz
Distortion ....................................................Less than 7% @3 watts @ 1000 Hz
Built-in Speaker .........................................8 ohms, 5w
External Speaker (Not supplied)............ 8 ohms; disables internal speaker
when connected
PA SYSTEM
Power Output ............................................4 watts into external speaker
External Speaker for PA..........................8 ohms 4 Watts min.
(Not Supplied) ...........................................the PA speaker also monitors the
receiver; separate jack provided
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
3736
Limited Two Year Warranty
COBRA ELECTRONICS CORPORATION warrants that its
Cobra CB Radios, and the com po nent parts thereof, will be
free of defects in workmanship and materials for period
of two (2) years from the date of first consumer purchase.
This war ran ty may be enforced by the first consumer
pur chas er, pro vid ed that the product is utilized within
the U.S.A.
Cobra will, without charge, repair or replace, at its option,
de fec tive CB radios, products or com po nent parts upon
de liv ery to the Cobra factory Service Department, ac compa nied by proof of the date of first consumer pur chase,
such as a du pli cat ed copy of a sales receipt.
You must pay any 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.
Cobra Electronics
Corporation
6500 West Cortland Street
Chicago, Illinois 60707
www.cobra.com
Optional Accessories
You can find quality Cobra products and accessories at your local Cobra dealer, or in the
U.S.A., you can order directly from Cobra. See ordering info on page 38.
Replacement DC Power Cord
For in vehicle use
426-002-N-001
Replacement Mounting
Bracket
For in vehicle use
251-199-9-001
Replacement Thumb Screws
For in vehicle use
634-081-9-001
Exclusions: This limited warranty does not apply; 1) to any
product dam aged by accident; 2) in the event of misuse or
abuse of the product or as a result of un au tho rized alterations or repairs; 3) if the serial number has been altered,
defaced or re moved; 4) if the owner of the product resides
outside the U.S.A.
All implied warranties, including war ran ties of
mer chant abil i ty and fitness for a par tic u lar purpose
are limited in duration to the length of this warranty.
Cobra shall not be liable for any incidental, con se quential or oth er dam ag es; including, without lim i ta tion,
damages re sult ing from loss of use or cost of in stal la tion.
Some states do not allow limitations on how long an
implied warranty lasts and/or do not allow the ex clu sion
or limitation of incidental or con se quen tial dam ag es, so
the above lim i ta tions may not apply to you.
Replacement Microphone
Bracket
For in vehicle use
741-080-9-001
Dynamic External
Speaker
HG S100
21” Base Loaded Magnet
Mount Antenna
HG A1000
Noise Canceling
External Speaker
HG S300
38” Base Loaded Magnet
Mount Antenna
HG A1500
Noise Canceling
With Talk Back
External Speaker
HG S500
3938
25 LX
The CB Story
If You Think You Need Service
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.
A Consumer Service Representative can be reached through this same number
8:00 am - 5:30 pm, Monday through Friday, Central Time.
Technical assistance is also available on-line in the Frequently Asked Questions (FAQ) section at
www.cobraelec.com or by e-mail to productinfo@cobra.com
If you think you need service call 1.773.889.3087
“If your product should require factory service please call Cobra first before sending your unit in.
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.
1. For Warranty Repair include some form of proof-of-purchase, 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.
3. 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.
4. Pack unit securely to prevent damage in transit. If possible, use the original packing material.
5. 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
W. Cortland St., Chicago, IL 60707.
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 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 1.773.889.3087 for
assistance.
Trademark Info
Cobra®, Dynamike®, Nothing Comes Close to a Cobra® and the snake design are registered
trademarks of Cobra Electronics Corporation, USA.
Cobra Electronics Corporation™ is a trademark of Cobra Electronics Corporation, USA.
Operating Instructions for your
Cobra 25 LX
Special Edition CB Radio
U.S. Patent Nos. D630202, D630625
©2012 Cobra Electronics Corporation
Printed in China
Part No. 480-744-P Version B
The Citizens Band lies between the shortwave
2
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.)
DIM / ESC
FCC Regulations
FCC regulations permit only “transmissions”
(one party to another) rather than “broadcasts”
(to a wide audience). Thus, advertising is not
CH9 / 19
CB / PA
NB
3
2
4
1
5
3
7
1
SIG +30dB
VOL SQ
OFF
1
RF GAIN
MIN MAX
SCAN / M SCAN
DYNAMIKE
MIN
TX PWR
TX
RX
9
MEM NB
S
H
U
P
E
N
U
T
N
E
E
R
M
allowed on CB Channels because that is “broadcasting.”
3
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
4
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
5
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 LX
6
1. CB transceiver 5. Operating Manual
2. Microphone 6. DC power cord
3 Transceiver bracket 7. FCC rules (not shown)
4. Microphone bracket
Nothing Comes Close to a Cobra®
A1
Controls and Indicators
Front Side
1. 4-Pin Microphone
Connector
2. Power On/Off, Volume
3. Squelch
4. Dynamike
5. Menu/Enter/Channel
Selector
6. RF Gain
7. Dim/Escape Button
8. Channel 9/Channel 19
Button
9. Scan/Memory Scan
10. CB/PA Button
11. LCD Display13.
12. RX (Receive)/TX (Transmit),
Indicators
13. Signal Strength Meter
14. NB Button
15. 1Microphone
Back Side
16. Public Address Speaker
Jack
17. External Speaker Jack
18. Antenna Connector
19. Power Jack
8
CH9 / 19
CB / PA
10
NB
14
1
1
SIG +30dB
VOL SQ
OFF
1
12
13
3
2
4
TX PWR
TX
RX
5
3
7
9
2
3
Our Thanks to You
Thank you for purchasing the Cobra 25 LX CB
15
11
MEM NB
S
H
U
P
E
N
U
T
N
E
E
R
M
5
RF GAIN
MIN MAX
6
DYNAMIKE
MIN
SCAN / M SCAN
DIM / ESC
4
9
7
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.
NOTE
This device complies with part 15 of the FCC Rules. Operation
is subject to the following two (2) conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received,
including interference that may cause undesired operation.
The manufacturer is not responsible for any radio or tv inter-
Cobra Customer Service
Live operators are available
M-F 8:00 am - 5:30 pm Central
Time at: 773-889-3087
Automated Technical
Assistance available 24 hours a
day, seven days a week. E-mail
questions to: productinfo@
cobra.com
Cobra on the World Wide Web:
Frequently Asked Questions
(FAQ) can be found on-line at:
www.cobra.com
Optional Accessories
Ordering From U.S.A.
Call 773-889-3087 for pricing or visit www.cobra.com.
For Credit Card Orders
Call 773-889-3087 [Press one from the main menu] 8:00 a.m.
to 5:30 p.m. Central Time, Monday through Friday.
Make Check or Money Order Payable To
Cobra Electronics, Attn: Accessories Dept.,
6500 West Cortland Street, Chicago, IL 60707 U.S.A.
To Order Online
Please visit our website: www.cobra.com
ference caused by unauthorized modifications to this equipment. Such modifications could void the user’s authority to
operate the equipment.
17
18
16
A2
19
A3
40
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