Cobra 29 LX LE 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 29 LX
Turning On Your CB.............................................................................. 8
Setting Channel Selector.................................................................... 9
Calibrate For SWR (Standing Wave Ratio).................................... 10
To Receive................................................................................................ 12
Selecting a Channel.............................................................................. 13
S-Meter...................................................................................................... 13
To Transmit.............................................................................................. 14
Setting Dynamike®................................................................................ 15
Menu Mode ............................................................................................. 16
Setting the Clock ................................................................................... 17
Setting the Alarm .................................................................................. 17
Setting the Count Down Timer........................................................ 18
Key Tones Mode .................................................................................... 18
Radio Check Mode................................................................................ 19
Setting Display Color Mode............................................................... 20
Setting Brightness Mode.................................................................... 21
Setting Contrast Mode ........................................................................ 21
Weather Information............................................................................ 22
Weather Channels................................................................................. 23
Weather Alert Mode............................................................................. 24
Setting Weather Alert Scan................................................................ 24
Setting Weather Auto Scan ............................................................... 24
Software version/Factory Settings.................................................. 25
NB-ANL/Off (Noise Blanker/Automatic.......................................... 26
Noise Limiter Switch)
RF Gain Control ...................................................................................... 26
Program Memory Channels............................................................... 27
Scan/Memory Scan............................................................................... 27
Scan CB Channels.................................................................................. 28
Scan Memory Channels ...................................................................... 28
Dimmer Control..................................................................................... 28
Setting Squelch...................................................................................... 29
S/RF Meter................................................................................................ 30
External Speaker.................................................................................... 31
Home And Office Set-Up .................................................................... 32
Temporary Mobile Set-Up.................................................................. 33
How Your CB Can Serve You................................................................. 34
A Few Rules You Should Know ........................................................34
Channel 9 Emergency Messages.....................................................34
CB 10 Codes.............................................................................................36
Frequency Ranges .....................................................................................38
29 LX Specifications..................................................................................39
FCC Statement ............................................................................................40
Warranty Information..............................................................................42
Product Service...........................................................................................43
Ordering Info ...............................................................................................44
Features of This Product
• Selectable 4-Color LCD Display
• 10 Weather Channels
• Weather Scan
• Emergency Weather Alert
• 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
• SWR Calibration Meter
• Instant Channel 19 and 9
• Front Panel 4-Pin Microphone
Connector
• Switchable Automatic Noise
Limiter & Noise Blanker
• Adjustable Dynamike Boost
• Tactile Controls
• 9 Ft Mic Cord
• Programmable Dimmer Control
• RF Gain
1
How to Use Your Cobra 29 LX

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
interference, remove the bracket and use it
as a template to mark the location for the
mounting 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
underside 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
washers. The mounting must
be mechanically strong,
conveniently located.
continued
Drill the holes and secure the bracket.
2
1
Connect the antenna cable plug to the receptacle
marked “ANT” on the back of the unit.
3

Installation
54
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 to an accessory
fuse prevents the unit from
being left on accidentally, and
also permits operating the unit
without running the engine.
Note
In positive ground vehicles the
red wire goes to the chassis and
the black wire is connected to
the ignition switch.
Note
When connected to an
accessory fuse, unit will self test
the emergency weather alert
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 of the DC power
cord to the negative post of the battery or to
the vehicle chassis.
4
5
Plug the power cord into the jack marked
“Power” on the back of the unit. Be sure to
observe polarity markings.
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.
6
7
Attach the 4-pin microphone cable to
receptacle on front of unit and install unit
in bracket securely.
8
Installation
Note
If microphone is not
connected, audio will not
be heard at speaker.

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 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 29 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.
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 visit our
website: www.cobra.com
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
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.
6
1
A standard antenna connector is provided
on the transceiver for easy connection.

Press the CB/WX button to change modes.
Operation
9
Operation
Turning On Setting Channel
Selector
8
Turning On
Make sure the power cord, antenna and
microphone are connected to their proper
connectors before starting.
Setting Channel Selector
1
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
Note
Press CB/WX to select CB,
weather channels mode.

While holding mic
button adjust the
SWR CAL knob so
the meter swings
to the CAL mark on
the meter (located
on the right).
Operation
Operation
Calibrate For
SWR (Standing
Wave Ratio)
1110
continued
Note
Calibration must be made in an
open area (never in a garage).
Vehicle doors must be closed.
No one should be standing near
the antenna. (See your antenna
directions for more complete
information).
Note
The reading will be slightly
higher on Channels 1 and 40
compared to Channel 20.
Push and hold mic button.
Press SWR/CAL button to select CAL.
2
1
3
Calibrate for SWR (Standing Wave Ratio)
SWR meter calibration is required to accurately
measure the SWR of the connected antenna
system. Careful adjustment is critical to obtain
best accuracy.
PUSH &
HOLD
Select channel 20.
4

Rotate the On/Off Volume knob clockwise.
The RX icon will be displayed.
Repeat the same steps two through five on
Channel 1 and 40. This will check SWR for all
channels.
The S/RF-SWR-CAL switch must be in the S/RF
setting to read the meter.
6
Release the PTT button, press and release the
S/RF-SWR CAL button to the SWR position.
Then press the PTT button to read the SWR
reading.
5
Operation
13
Operation
12
1
Note
When switched to SWR
mode the meter reading
should ideally be as far to the
left as possible. Anything over
3 is not acceptable. A slight
antenna height adjustment
(higher or lower) may be
required. Repeat recalibration
steps.
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
Calibrate for
SWR continued
CH 9/
DIM
SWR
CAL
ESC
V
OL SQ DYNAMIKE
M
E
N
U
P
U
S
H
E
N
SIG
RF
+30dB
1
1.5 23CAL
3579
SWR
RX
S/RF

PUSH &
HOLD
Setting Dynamike®
This controls the microphone sensitivity
(outgoing audio level).
To Transmit
15
To Transmit
14
Setting
Dynamike®
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.
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
transmitting, hold the microphone two inches
from your mouth and speak in a clear, normal
voice. Release to receive.

Operation
Operation
17
16
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.
CB/WX
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.
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
Level 1: Level 2:
Level 3: Level 4:
Level 5:
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.
Setting the
Alarm
Setting the Alarm
Your 29 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 clock should be connected
to constant 12V to run
continuously.

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.
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.
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.
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
RF POWER OUTPUT
PASS
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
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.
Test 3- Antenna Mismatch Warning: Press
Push-to-Talk button to check antenna/radio for
proper matching.
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
ANTENNA
PASS
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
ANTENNA
FAIL
1
23
1
23
1
23
Operation
19
18
Operation
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.
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.
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.

Operation
Operation
21
20
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.
Note
Exit will return to menu mode.
ESC will exit and return to CB
Standby.
Weather Auto
Scan
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.
1
2
3
4
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 28.
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.
CB/WX

Weather
Information
Note
To see a full listing of NOAA
Weather Radio stations and
locations, please visit:
weather.gov/nwr/station_listing
For ideal weather reception use
a dual band antenna (center
load/baseload).
Weather Alert
What You Should Know About Weather
If threatening weather is nearby, the National
Weather Service may broadcast a 10 second alert
tone. This tone will be heard through the CB,
even if the CB/WX Control is in the CB mode or
the unit is turned off.
This enables you to monitor CB frequencies and
still be warned by the National Weather Service
Emergency Alert. When you hear the alert, press
the CB/WX button in the WX mode. You will then
be able to hear the Weather Warning Broadcast.
Your 29 LX has a special auto squelch circuit
for weather transmission which disables your
squelch control.
Weather
Channels
Weather Alert Scan
The unit will continually scan all 10 WX channels for
1050 Hz tone. If the tone is detected the unit will
activate WX mode on the channel with the tone.
Default state is Off. Go to Menu mode to choose
On/Off (see page 24):
What is Weather Radio?
NOAA Weather Radio (NWR) is a
service of the National Oceanic
and Atmospheric Administration
(NOAA), of the U.S. Department
of Commerce. 380 NWR stations
are in operation by the U.S.
Government in addition to
several NWR stations that are
maintained by private interest
groups. The capability is to
supplement warnings by sirens
and by commercial radio and
television.
The 10 National
Weather Channels provide full
coverage to keep you informed
of weather conditions, 24
hours a day, 7 days a week.
Weather Auto Scan
If active while in CB mode, will determine if the
present WX channel is active. If the present WX
channel is not active, will search for the strongest
WX channel and auto change to that channel.
Default is off. Go to Menu mode to choose on/off
(see page 24).
2322
Operation Operation

Operation
Operation
2524
Setting Weather Auto Scan
Press Menu/Enter knob and rotate clockwise to WX
Auto Scan. Press Menu/Enter knob to select On/Off.
Press Menu/Enter knob to select On/Off and exit
to main menu.
Setting Weather
Auto Scan
Setting Weather Alert Scan
Press Menu/Enter knob and rotate clockwise to
WX Alert Scan. Press Menu/Enter knob to select
On/Off.
Press Menu/Enter knob to select On/Off and exit
to main menu.
Weather Alert
Mode
Setting Weather Alert Mode
Turns WX Alert On/Off. Default is Off.
Press Menu/Enter knob to select Set WX Alert.
If Weather is On, WX Alert Icon will be displayed.
Press Menu/Enter knob to select On/Off and exit
to main menu.
Setting
Weather Alert
Scan
Note
Press Dim/Escape
button to return to CB mode.
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 Settings then Software Version.
To restore default settings, Press Menu/Enter
knob again. Rotate Menu/Enter knob clockwise
to select Settings then Go To Default.
Press Menu/Enter knob to restore default
settings. Choose NO to maintain present
setting with no change.
Note
If an alert is detected the unit
will activate WX mode on the
channel with the alert. Use
Menu/Enter knob to select
On/Off and press to set.
Note
Default display color is green.
Note
Press Dim/Escape
button to return to CB mode.
Note
Press Dim/Escape
button to return to CB mode.

2726
Operation Operation
When switched to ANL the Automatic Noise
Limiter is activated. This helps reduce noise
created by the vehicle’s electronics.
When switched to NB/ANL mode the RF Noise
Blanker is also activated, providing increased
noise filtration.
When switched to OFF mode all noise
filtration will be turned off.
NB-ANL/OFF
(Noise Blanker /
Automatic Noise
Limiter) 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 repetitive
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-ANL/OFF (Noise Blanker/Automatic
Noise Limiter) Button
1
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.
Note
If in WX mode the unit will
scan Weather channels.
2
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
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.

Operation
Operation
29
28
Full clockwise rotation closes the gate
allowing only very strong signals to enter.
Full counterclockwise rotation opens the “gate”
allowing all signals in.
Dimmer Control
Setting Squelch
Squelch is the “control gate” for incoming signals.
Dimmer Control
1
2
1
Press Dim/Esc button to toggle between day
and night settings.
See setting instructions on page 21.
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
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.
Scan Memory Channels
To scan memory channels, press and release
Scan/Mem Scan button twice.
Scan Memory
Channels

Operation
Operation
31
S/RF Meter
External Speaker
S/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.
The S/RF-SWR-CAL button must be in the
S/RF mode.
1
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.
To order external speakers and
other accessories, please go to
www.cobra.com
Note
Cobra external speakers are
rated at 10 watts.
Connect an external speaker to the external
speaker jack on the rear panel.
1
30
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
Continued

Temporary Mobile Set-Up
Home And Office Set-Up
3332
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 Supply 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.
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

How Your CB Can Serve You
3534
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

How Your CB Can Serve You
3736
Code Meaning
10-29 Time is up for contact
10-30 Does not conform to FCC rules
10-33 Emergency traffic
10-34 Trouble at this station
10-35 Confidential information
10-36 Correct time is
10-37 Wrecker needed at
10-38 Ambulance needed
10-39 Message delivered
10-41 Turn to channel
10-42 Traffic accident at
10-43 Traffic tie up at
10-44 Have a message for
10-45 All units within range please report
10-50 Break channel
10-60 What is next message number?
10-62 Unable to copy. Use phone
10-63 Net directed to
10-64 Net clear
10-65 Awaiting your next message/assignment
10-67 All units comply
10-70 Fire at
10-71 Proceed, transmission in sequence
10-77 Negative contact
10-81 Reserve hotel room for
10-82 Reserve room for
10-85 My address is
10-91 Talk closer to mic
10-93 Check my frequency on this channel
10-94 Give me a long count
10-99 Mission completed, all units secure
10-200 Police needed at
CB 10-Codes
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

29 LX Specifications
3938
Frequency Ranges
GENERAL
CHANNELS CB - 40 CH
FREQUENCY RANGE CB - 26.965 TO 27.405 MHZ
WX - 162.400 TO 162.775 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 7-9/32” W x 2-13/63” H
Weight..........................................................4 lbs.
Antenna Connector.................................UHF; SO-239
Meter.............................................................Indicates relative
power output received
signal strength, and vswr
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
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
The Cobra 29 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.
1 26.965 21 27.215 1 162.550
2 26.975 22 27.225 2 162.400
3 26.985 23 27.255 3 162.475
4 27.005 24 27.235 4 162.425
5 27.015 25 27.245 5 162.450
6 162.500
6 27.025 26 27.265 7 162.525
7 27.035 27 27.275 8 161.650
8 27.055 28 27.285 9 161.775
9 27.065 29 27.295 10 163.275
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. WX Freq.
Channel In MHz Channel In MHz Channel In MHz