Cobra 25 LX User manual

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
How to Use Your Cobra 25 LX
25LX_MANL.indd 1 11/15/11 9:42 AM
For Sales Information Please Contact
RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.
Wilmington, NC 28411
[phone] / [phone]

Installation
Installation
Location
32
Mounting and
Connection
Mounting and Connection
Hold the radio with the mounting bracket in
the exact desired location. If there is no inter-
ference, remove the bracket and use it as a
template to mark the location for the mount-
ing screws.
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 under-
side of the dash with the microphone bracket
beside it.
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 self-
tapping screws and star wash-
ers. The mounting must be
mechanically strong, conve-
niently located.
continued
Drill the holes and secure the bracket.
2
1
Connect the antenna cable plug to the recep-
tacle marked “ANT” on the back of the unit.
3
25LX_MANL.indd 2-3 11/15/11 9:42 AM
For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - [phone] / [phone]

Installation
54
Note
Before installing the CB radio,
visually check the vehicle’s
battery connection to deter-
mine which terminal, positive
or negative, is grounded (pos-
itive is the larger of the two)
to the engine block (or chas-
sis). 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.
In a negative grounded vehicle, connect the
red lead of the DC power cord to an accessory
12 volt fuse.
Connect the black lead to the negative side
of the vehicle. This is usually the chassis. Any
convenient location with a good electrical
contact (remove paint) may be used.
4
5
Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.
Mount the microphone
bracket on either side
of the unit (driver’s left)
using two screws sup-
plied. Bracket should be
placed under the dash
so microphone is readily
accessible.
6
7
Attach the 4-pin microphone cable to
receptacle on front of unit and install unit
in bracket securely.
8
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN
MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
Installation
Note
If microphone is not
connected, audio will not
be heard at speaker.
25LX_MANL.indd 4-5 11/15/11 9:42 AM
For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - [phone] / [phone]

Ignition Noise Interference
Antennas
Use of a mobile receiver at low signal levels is
normally limited by the presence of electrical
noise. The primary source of noise in automo-
biles is from the alternator and ignition system.
Typically, when signal level is adequate, the back-
ground 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 signifi-
cantly discharge the vehicle’s battery.
Even though the Cobra 25 LX has an automatic
noise limiter, in some installations ignition inter-
ference may be high enough to make good com-
munications 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.
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 maxi-
mum power output. Cobra loaded type antenna
models are highly recommended for most instal-
lations. 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.
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.
CB Antenna
7
Note
For optimum performance in
passenger cars the ideal anten-
na location is on the center of
the roof. Second choice is on the
center of the trunk.
Note
Because many newer trucks
feature fiberglass door skins,
the outside mirror must be
grounded to the chassis via a
ground strap, if the antenna is
mounted on the mirror bracket.
Note
3-way Combination Antennas
are also available which allow
operation of all three bands
(AM-FM & CB), using a single
antenna. However, this type
of antenna usually results in
less than normal transmit and
receive range when compared
to a standard-type “Single
Band” CB antenna. Call 773-
889-3087 for further informa-
tion.
6
1
A standard antenna connector is provided
on the transceiver for easy connection.
25LX_MANL.indd 6-7 11/15/11 9:42 AM
For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - [phone] / [phone]

Press the CB/PA button to change modes.
Operation
9
Operation
Turning On Setting Channel
Selector
8
Turning On
Make sure the power cord, antenna and micro-
phone are connected to their proper connectors
before starting.
Setting Channel Selector
1
SIG
+30dB
1
1234TX
PWR
3579
MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
2
Rotate the On/Off Volume knob clockwise to
turn unit on and adjust to a normal listening
level.
Select one of forty channels and adjust
volume. The selected channel (1 through
40) will be indicated by the readout directly
above the channel selector knob
3
SIG
+30dB
1
1234TX PWR
3579
MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN
MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
Note
Press CB/PA to select CB or PA
(public address) mode.
SIG +30dB
1
1234TX PWR
3579MEM
NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
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For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - [phone] / [phone]

Rotate the On/Off Volume knob clockwise.
The RX icon will be displayed.
Operation
11
Operation
10
S-Meter
S-Meter
Swings proportionately to strength of incoming
signal when receiving.
Unit should be in CB mode. Rotate channel
selector clockwide or counter-clockwise to
select desired channel.
1
Selecting A
Channel
Selecting A Channel
To Receive
1
To Receive
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SIG
+30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SIG +30dB
1
1234TX PWR
3579
MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
25LX_MANL.indd 10-11 11/15/11 9:43 AM
For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - [phone] / [phone]

PUSH &
HOLD
Setting Dynamike®
This controls the microphone sensitivity
(outgoing audio level).
To Transmit
13
To Transmit
12
Setting
Dynamike®
Caution!
Be sure the antenna is properly
connected to the radio before
transmitting. Prolonged trans-
mitting 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.
Operation Operation
3
Select desired channel.
1
Initially, set fully clockwise so that maximum
voice volume is available. Dynamike may
have to be reduced in some conditions.
2
Transmit
Push and hold mic button to transmit.
Transmitter is now activated. When transmit-
ting, hold the microphone two inches from
your mouth and speak in a clear, normal voice.
Release to receive.
SIG
+30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN
MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SIG +30dB
1
1234TX PWR
3579
MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
25LX_MANL.indd 12-13 11/15/11 9:43 AM
For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - [phone] / [phone]

Operation
Operation
15
14
Menu Mode Menu Mode
Used to program special features. Menu/Enter
knob is used to move cursor to desired feature
to program.
Rotate Menu/Enter knob clockwise to navigate
menu levels.
Press Menu/Enter knob to select feature to be
programmed.
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
Note
Use Dim/Escape button to exit
from any routine back to CB
standby mode.
Setting the
Clock
Setting the Clock
Using the clock, alarm and countdown functions.
To set the clock, press Menu/Enter knob and
select Set Clock.
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.
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SWR/CAL
NB/ANL
VOL SQ DYNAMIKERF GAIN DELTA TUNE T BACK SWR
CAL
OFF MIN MINOFF
MAX
ESC
MEM SCAN
S/RF
M
E
N
U
P
U
S
H
E
N
T
E
R
SIG
RF
+30dB
1
1.5 23CAL
3579
SWR TX
RX
NB/ANL
MEMWX !
ANL
S/RF
SWR
CAL
CH 9/
19
CB/WX /
DIM
SCAN
PA
EXIT
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SET CLOCK
ALARM CLOCK
SET COUNT DOWN
DISPLAY COLOR
BRIGHTNESS
CONTRAST
Level 1: Level 2:
SWR/CAL
NB/ANL
VOL SQ DYNAMIKERF GAIN DELTA TUNE T BACK SWR
CAL
OFF MIN MINOFF
MAX
ESC
MEM SCAN
S/RF
M
E
N
U
P
U
S
H
E
N
T
E
R
SIG
RF
+30dB
1
1.5 23CAL
3579
SWR TX
RX
NB/ANL
MEMWX !
ANL
S/RF
SWR
CAL
CH 9/
19
CB/WX /
DIM
SCAN
PA
KEY TONES
RADIO CHECK
SETTING
Level 3: Level 4:
Note
Normal display will appear if
clock has not yet been set.
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SET CLOCK
ALARM CLOCK
SET COUNT DOWN Note
Use Dim/Escape button to exit
from any routine back to CB
standby mode.
Setting the
Alarm
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.
Note
The radio should be connected
to a constant 12V source to
maintain the time when the
radio is turned off.
25LX_MANL.indd 14-15 11/15/11 9:43 AM
For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - [phone] / [phone]

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.
Operation
17
16
Operation
Setting the
Alarm continued
Once alarm settings are complete, rotate Menu/Enter
knob clockwise to Set Snooze and press to select.
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.
SWR/CAL
NB/ANL
VOL SQ DYNAMIKERF GAIN DELTA TUNE T BACK SWR
CAL
OFF MIN MINOFF
MAX
ESC
MEM SCAN
S/RF
M
E
N
U
P
U
S
H
E
N
T
E
R
SIG
RF
+30dB
1
1.5 23CAL
3579
SWR TX
RX
NB/ANL
MEMWX !
ANL
S/RF
SWR
CAL
CH 9/
19
CB/WX/
DIM
SCAN
PA
EXIT
SET SNOOZE
ALARM LENGTH
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.
Setting Display
Color Mode
Note
Select EXIT to return to
main menu. Press Dim/
Escape button to return to
CB mode.
Setting Display Color Mode
Press Menu/Enter knob and scroll down to select
Display Color.
Press and release Menu/Enter to set the color.
Rotating Menu/Enter knob clockwise changes the
display color from green to blue to amber to red
then back to green.
Press Menu/Enter knob or escape button again
to exit routine.
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
DISPLAY COLOR
BRIGHTNESS
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SET COLOR
EXIT
TURN CH KNOB TO
1
2
3
4
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
25LX_MANL.indd 16-17 11/15/11 9:43 AM
For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - [phone] / [phone]

Operation
Operation
19
18
Setting
Brightness
Mode
Setting Brightness Mode
Press Menu/Enter knob to select Set Brightness
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.
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.
Press Menu/Enter knob again to exit routine.
Note
If an attempt is made to
exceed the highest or lowest
brightness levels, 1 error beep
will be heard.
DAY-BRIGHT
NIGHT-DIM
SET BRIGHTNESS
SET LEVEL
EXIT
TURN CH KNOB TO
Note
Exit will return to menu mode.
ESC will exit and return to CB
Standby.
Weather Auto
Scan
DAY-BRIGHT
NIGHT-DIM
SET BRIGHTNESS
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 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.
Press Menu/Enter knob again to exit routine.
Note
If an attempt is made to
exceed the highest or lowest
contrast levels, 1 error beep will
be heard.
SET CONTRAST
EXIT
TURN CH KNOB TO
Key Tones
Mode
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.
Note
Press Dim/Escape
button to return to CB mode.
Radio Check
Mode
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.
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.
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
BATTERY VOLTAGE
FAIL LOW
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.
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 Push-To-Talk within 10
seconds or unit will go to the
next test.
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
RF POWER OUTPUT
PASS
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
RF POWER OUTPUT
FAIL
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.
1
23
1
23
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
BATTERY VOLTAGE
FAIL HIGH
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN /
M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
PRESS PTT
TO CHECK
POWER OUTPUT
25LX_MANL.indd 18-19 11/15/11 9:43 AM
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Operation
Operation
2120
Software
Version/Factory
Settings
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.
To restore default settings, Press Menu/Enter
knob again. Rotate Menu/Enter knob clockwise
to select Setting then Go To Default.
Press Menu/Enter knob to restore default
settings. Choose NO to maintain present
setting with no change.
RADIO CHECK
SETTING
CONTRAST
GO TO DEFAULT
SOFTWARE VER
YES
RESTORE DEFAULT
NO
GO TO DEFAULT
SOFTWARE VER
Note
Default display color is green.
When switched to NB mode the RF Noise
Blanker is activated, providing increased
noise filtration.
When switched to OFF mode all noise
filtration will be turned off.
NB OFF Button
RF Gain Control
RF Gain Control
The RF Gain is used to optimize reception in
strong or weak signal areas.
Note
The RF Gain is used to optimize
reception in weak signal areas.
Note
The RF noise blanker is very
effective in reducing repeti-
tive noises such as ignition
interference.
Rotate the RF Gain knob counterclockwise to
reduce gain in strong signal areas. In weak
signal areas turn clockwise to increase gain.
1
NB/OFF Button
1
SIG
+30dB
1
1234TX
PWR
3579
MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SIG +30dB
1
1234TX PWR
3579
MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
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2322
Operation Operation
Pressing the Scan/Memory Scan button
toggles from Off to Scan All Channels to
Memory Channel Only Scan and back to Off.
Press Dim/Escape button to end Scan and
return to CB mode.
1
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.
2
SIG +30dB
1
1234TX PWR
3579
MEM
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
Note
The radio should be
squelched before scan
features are activated.
Note
Keying the microphone will
stop the scan feature.
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.
Program Memory Channels
Program Memory
Channels
SIG +30dB
1
1234TX PWR
3579
MEM
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
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. Dimmer Control Dimmer Control
1
Press Dim/Esc button to toggle between day
and night settings.
See setting instructions on page 20.
SIG +30dB
1
1234TX PWR
3579
MEM
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
Scan CB Channels Scan CB
Channels
To scan all 40 CB channels, the unit must be
squelched. Press and release Scan/Mem Scan
button once.
SIG +30dB
1
1234TX PWR
3579MEM
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
CB SCAN
27.405
Scan Memory Channels
To scan memory channels, press and release
Scan/Mem Scan button twice.
Scan Memory
Channels
SIG +30dB
1
1234TX PWR
3579MEM
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
CB MEM SCAN
27.405
SIG +30dB
1
1234TX PWR
3579
MEM
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
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Operation
Operation
25
24
Full clockwise rotation closes the gate
allowing only very strong signals to enter.
Full counterclockwise rotation opens the “gate”
allowing all signals in.
Setting Squelch
Squelch is the “control gate” for incoming signals.
2
1
NOISE
WEAK SIGNALS
MEDIUM SIGNALS
STRONG SIGNALS
NOISE
WEAK SIGNALS
MEDIUM SIGNALS
STRONG SIGNALS
GATE OPEN
NOISE
WEAK SIGNALS
MEDIUM SIGNALS
STRONG SIGNALS
Gate open
NOISE
WEAK SIGNALS
MEDIUM SIGNALS
STRONG SIGNALS
GATE CLOSED
Gate closed
Setting Squelch
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
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.
3
NOISE
WEAK SIGNALS
MEDIUM SIGNALS
STRONG SIGNALS
GATE
Gate set to Desired
Squelch Setting (DSS)
Setting Squelch
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
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Operation
Operation
27
S/RF Meter External Speaker
S/RF Meter
This meter swings proportionately to the
RF output (outgoing signal) and incoming
receive signal.
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 speak-
er is plugged in, the internal
speaker is automatically discon-
nected. See accessory page 43.
Note
Cobra external speakers are
rated at 10 watts.
Connect an external speaker to the external
speaker jack on the rear panel.
1
26
SIG +30dB
1
1234TX PWR
3579
MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
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Operation
Operation
29
28
PA (Public
Address)
PA (Public Address)
Connect an external PA speaker to the PA jack
on the rear panel.
Press CB/PA button to select PA.
Push and hold microphone button and speak
in a normal voice. Your voice will now transmit
on the PA speaker.
Adjust PA speaker volume with the
Dynamike® control.
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 speak-
er. Adjust Volume Control to a
normal listening level.
1
2
3
4
PUSH &
HOLD
SIG +30dB
1
1234TX PWR
3579
MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
SIG +30dB
1
1234TX PWR
3579MEM NB
TX
RX
VOL SQ
OFF
DYNAMIKE
MIN
RF GAIN
MIN
MAX
M
E
N
U
P
U
S
H
E
N
T
E
R
SCAN / M SCAN
DIM / ESC
CB / PA
NB
CH9 / 19
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Temporary Mobile Set-Up
Home And Office Set-Up
3130
Base Station
Operation
(From 120V AC
House Current)
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 quickly
“install” your transceiver for temporary use.
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.
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.
1
Connect properly installed and matched base
station antenna.
Simply connect the red (+) and black (-)
leads of the transceiver to the corresponding
terminals of the power pack.
Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.
2
3
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How Your CB Can Serve You
3332
How Your CB Can Serve You
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.”
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):
Call Sign Identify yourself.
Location Be exact.
Injuries Number. Type. Trapped?
Problem Give details and help needed.
Transmit CLIP repeatedly so any monitor can assist.
Channel 9
Emergency
Messages
Note
If no response on channel 9,
try channels 19 or 14.
• Warnoftrafficproblems
• Provideweatherandroaddata
• Providehelpineventofanemergency
• Providedirectcontactwithhomeoroffice
• Assistpolicebyreportingerraticdrivers
• Get“localinformation”tofinddestination
• Communicatewithfamilyandfriends
• Suggestspotstoeatandsleep
• Keepyoualertwhiletraveling
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.
A Few Rules
You Should
Know
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How Your CB Can Serve You
3534
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
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
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25 LX Specifications
3736
Frequency Ranges
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 x6-3/8” W x2-3/16” 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)
The Cobra 25 LX 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.
126.965 21 27.215
226.975 22 27.225
326.985 23 27.255
427.005 24 27.235
527.015 25 27.245
627.025 26 27.265
727.035 27 27.275
827.055 28 27.285
927.065 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
Channel Channel
CB Freq. CB Freq.
Channel In MHz Channel In MHz
25LX_MANL.indd 36-37 11/15/11 9:43 AM
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3938
Optional Accessories
COBRA ELECTRONICS CORPORATION warrants that its
Cobra CB Radios, and the component 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 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,
defective CB radios, products or component parts upon
delivery to the Cobra factory Service Department, accom-
panied 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, but the return charges
will be at Cobra’s expense, if the product is repaired or
replaced under warranty.
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 altera-
tions 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, consequen-
tial 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
www.cobra.com
Limited Two Year Warranty
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
Replacement Microphone
Bracket
For in vehicle use
741-080-9-001
21” Base Loaded Magnet
Mount Antenna
HG A1000
38” Base Loaded Magnet
Mount Antenna
HG A1500
Dynamic External
Speaker
HG S100
Noise Canceling
With Talk Back
External Speaker
HG S500
Noise Canceling
External Speaker
HG S300
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.
25LX_MANL.indd 38-39 11/15/11 9:43 AM
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