Cobra 29 LX Professional CB Radio User Manual
Thank you for purchasing the Cobra 29 LX professional CB radio transceiver. Used properly, this Cobra product will provide you with many years of reliable service.
History of CB Radio (Citizens Band)
Invented by Al Gross in 1945, CB radio initially served as a means of communication for soldiers during World War II. After the war, Gross strove to make two-way radios a means of personal communication, and the citizens band radio service was established by law in the United States in 1949. It wasn't until the 1970s that technology evolved and the CB radio market became established as a means of communication among drivers to report police speed traps and road hazards.
The citizens band radio service consists of 40 frequency channels that are mostly spaced 10 kHz apart. Transmitter power is limited to 4 watts in the United States, and range can vary depending on terrain and product quality.
Currently, the citizens band radio service does not require a license to operate, regardless of age, as long as the operating regulations established by the Federal Communications Commission (FCC) in the United States are followed.
Petition to Modify FCC Section 95 Regulations
In 2016, Cobra petitioned the FCC to revise Section 95 regulations to allow CB radios to use frequency modulation (FM). Cobra argues that FM offers better voice quality and reduced noise interference, which improves the quality of two-way radios and is an advantage for the customer.
Thanks to the direct efforts of Cobra Electronics and the enthusiastic support of its loyal customers and distribution network, the FCC granted the request. In 2021, Part 95 was officially updated to include FM as an option for two-way radio operation.
Today, thanks to Cobra Electronics' petitions to improve the quality of the citizens band radio service, users can enjoy the benefits of CB radio communication across a wide range of sectors.
Customer Support
If you encounter problems with this product, do not understand its features, menu, or installation, please refer to the user manual. If you need additional assistance after reading this manual, we are here to help you:
Questions about service, orders, and products
For repairs, product questions, and service hours, call 1 800 543-1608 or visit www.cobra.com
For assistance outside the United States
Contact your local dealer
AM/FM Radio 29 LX Features
The Cobra 29 LX is a professional CB radio with AM/FM dual-mode capabilities, 4 watts of power, 40 channels, and a 4-color LCD screen. Key features include:
- NB/ANL Button: Noise Blanker/Automatic Noise Limiter for reducing noise.
- S/RF SWR/CAL Button: Used for signal strength measurement, SWR calibration, and S/RF meter.
- LCD Screen: Displays channel, mode, and other information.
- Scan/Memory Button: For scanning channels and accessing memory functions.
- 9/19 Button: Quick access to channels 9 and 19.
- CB/WX/PA Button: Switches between CB, Weather, and Public Address modes.
- DIM Button: Adjusts display brightness for Day/Night modes.
- RF GAIN Control: Optimizes reception in areas with strong or weak signals.
- DELTA TUNE Control: Fine-tunes the received signal.
- TalkBack/SWR CAL Control: Adjusts talkback and calibrates SWR.
- Microphone Connector: 4-pin connector for the microphone.
- Volume/Squelch Control: Adjusts audio volume and squelch level.
- Dynamike® Control: Adjusts microphone gain.
- Channel Selector Knob: Selects the desired CB channel.
- PA Jack: For connecting an external Public Address speaker.
- External Speaker Jack: For connecting an external speaker.
- Antenna Connector: Standard SO-239 connector for the antenna.
- Power Connector: For connecting the power supply.
Installation
Location
Plan the location of the CB transceiver and microphone bracket before starting the installation. Choose a location that is convenient for use but does not obstruct the driver or passenger.
The transceiver is typically mounted under the dashboard, with the microphone bracket placed nearby.
NOTE: The transceiver is held in the universal mounting bracket by two wing nuts that allow it to be adjusted to a convenient angle. The bracket includes two self-tapping screws and star washers. Mounting should be mechanically secure and the location convenient.
Mounting and Connection
- Hold the radio with the mounting bracket in the desired location. If there is no interference, remove the bracket and use it as a template to mark the mounting screw locations.
- Drill the holes and secure the bracket.
- Connect the antenna cable plug to the jack marked "ANT" on the back of the unit.
- Connect the red wire of the DC power cord to a 12-volt accessory fuse or directly to the battery.
- Connect the black wire to the negative side of the vehicle's electrical system. This is typically the chassis.
- Plug the power cord into the jack marked "POWER" on the back of the unit. Be sure to observe polarity markings.
- The microphone can be attached to either side of the CB radio using the supplied screws. The microphone can also be mounted on the dashboard or any other convenient location.
- Attach the microphone to the front of the CB radio.
NOTE: If the microphone is not connected, sound will not be heard through the speaker.
PA (Public Address or Sound System)
- Connect an external PA speaker to the PA jack on the rear panel.
- Press the CB/PA/WX button to change modes.
NOTE: The PA speaker should have an 8-ohm impedance and a rated power of at least 4.0 watts. The speaker should be directed away from the microphone to prevent acoustic feedback. CB channel activity will be heard through the PA speaker. Adjust the volume to a normal listening level.
CB Antenna
Since the transmitter's maximum output power is limited by the FCC, the antenna plays a crucial role in transmission distance. Only a properly matched antenna system will allow for maximum output power. Cobra's loaded antenna models are highly recommended for most installations. Consult your Cobra dealer for more details or call 1 800 543-1608 to speak with a Cobra representative. A standard antenna connector is provided on the transceiver for easy connection.
For optimal performance in passenger cars, the ideal antenna location is the center of the roof. The second best location is the center of the trunk. Since many newer model trucks are equipped with a fiberglass door trim, the exterior mirror should be grounded to the chassis using a grounding strap when the antenna is mounted on the mirror bracket.
Three-way combination antennas are also available and allow the use of all three bands (AM-FM and CB) using a single antenna. However, this type of antenna generally has a lower than normal transmission and reception range compared to standard "single-band" CB antennas.
Cobra offers CB antennas and mounting solutions that can be purchased online. Please visit www.cobra.com, or if you wish to speak with an expert, please call 1 800 543-1608 and a member of our customer service team can assist you.
Operation
Powering On Your CB Radio
Ensure that the power cord, antenna, and microphone are connected to their respective connectors before starting.
- Turn the Volume On/Off knob clockwise to turn on the unit and set it to a normal listening level.
- Press the CB/PA/WX button to change modes.
AM/FM Modulation and Channels 9/19 Adjustment
The Cobra CB 29 LX allows communication in AM or FM mode. Each mode operates on channels 1 through 40. AM is the default mode.
To switch between AM and FM modes, briefly press the AM/FM button until the desired operating mode is displayed. Once selected, the chosen mode (AM or FM) will appear to the right of the channel displayed on the LCD screen.
To change and switch between channel 9, channel 19, and the current channel, press and hold the AM/FM button.
Channel Selector Adjustment
Select one of the forty channels and adjust the volume. The selected channel (1 to 40) is indicated by the display located directly above the channel selector knob.
SWR Calibration (Standing Wave Ratio)
SWR calibration allows you to properly adjust the antenna length and monitor the quality of the coaxial cable and all RF connections. This calibration is essential for optimal performance.
- Select channel 20.
- Press the SWR/CAL button to select CAL.
- Press and hold the microphone button.
- While holding the microphone button, adjust the SWR CAL knob so that the meter swings to the CAL mark on the meter (located to the right).
- Release the PTT button, then press and release the S/RF-SWR CAL button in the SWR position. Then press the PTT button to read the SWR.
- Repeat steps two through five on channels 1 and 40. This procedure allows you to check the SWR for all channels.
S/RF Meter
Oscillates proportionally to the RF output (outgoing signal) during transmission. The S/RF-SWR-CAL knob should be in the S/RF mode.
To Receive
Turn the Volume On/Off knob clockwise. The RX icon will be displayed.
Channel Selection
The unit must be in CB mode. Turn the channel selector knob clockwise or counter-clockwise to select the desired channel.
S-meter
Oscillates proportionally to the incoming signal strength during reception. The S/RF-SWR-CAL switch should be in the S/RF position to read the value.
To Transmit
- Select the desired channel.
- Press and hold the microphone button to transmit. The transmitter is now active. When transmitting, hold the microphone two inches from your mouth and speak in a clear, normal voice. Release the button to receive.
NOTE: Ensure the antenna is properly connected to the radio before transmitting. Prolonged transmission without an antenna, or with an improperly matched antenna, can damage the transmitter.
Be sure to read the FCC rules and regulations provided with this unit before making transmissions.
Dynamike® Control Adjustment
First, turn the knob fully clockwise to achieve maximum voice volume. In some conditions, it may be necessary to reduce the Dynamike control setting.
External Speaker
The external speaker jack is used for remote monitoring of the receiver. Connect an external speaker to the external speaker jack on the rear panel.
NOTE: The external speaker should have an 8-ohm impedance and a rated power of at least 4.0 watts. When the external speaker is connected, the internal speaker is automatically disconnected. Refer to page X for accessories.
NOTE: Cobra external speakers have a 10-watt rating.
Front Panel Controls
NB-ANL/OFF Button (Noise Blanker/Automatic Noise Reducer)
When set to ANL, the automatic noise limiter activates. This helps reduce noise generated by the vehicle's electronics. In NB/ANL mode, the RF noise blanker is also active, which helps filter out noise more effectively. In OFF mode, noise filtering is completely disabled.
NOTE: The RF noise blanker is very effective at reducing repetitive noises such as ignition system interference.
RF Gain Control
RF Gain is used to optimize reception in areas where the signal is strong or weak. Turn the RF Gain knob counter-clockwise to reduce gain in areas where the signal is strong. In areas where the signal is weak, turn the knob clockwise to increase gain.
NOTE: RF Gain is used to optimize reception in areas where the signal is weak.
Memory Channel Setup
- Set the first channel. Press and hold the Scan/MemScan button. The memory icon will appear. Select the second channel, press and hold the Scan/MemScan button again until the memory icon appears. Repeat the above steps to store up to 10 channels in memory.
NOTE: The radio must be set to the squelch setting before scan functions can be activated.
NOTE: Pressing the microphone interrupts the scan function.
- Pressing the Scan/Memory Scan button cycles through Off, "Scan All Channels," "Scan Memory Channels Only," and back to Off.
- Press the microphone PTT button to end the scan and return to CB mode.
NOTE: If you try to store more than ten channels, three error beeps will sound, and the message "Memory Full" will appear for 10 seconds or until you press another button.
NOTE: To delete a channel from memory, access the channel in question, then press and hold the scan button until the MEM icon turns off.
NOTE: If the unit is in WX mode, it will scan weather channels.
CB Channel Scan
To scan all 40 CB channels, the unit must be set to squelch. Press the Scan/Mem Scan button once, then release it.
Memory Channel Scan
To scan memory channels, press the Scan/Mem Scan button twice, then release it.
Dimmer Control
Press Dim to cycle through the Day (Day) and Night (Night) brightness settings. Press and hold the Dim button to cycle through Day (Day) and Night (Night) modes. Refer to the instructions for adjusting color and brightness for Day (Day) and Night (Night) modes on page 17.
Squelch Adjustment
Squelch is the "gatekeeper" for incoming signals.
- A full rotation clockwise closes the "gate," allowing only very strong signals to enter.
- A full rotation counter-clockwise opens the "gate," allowing all signals to enter.
- To achieve the desired squelch setting (DSS), turn the squelch control counter-clockwise until you hear noise. Then, turn the control clockwise until the noise stops. This is the DSS setting.
Menu Mode
Allows you to set special functions. The Menu/Enter knob is used to move the cursor to the function you want to set. Turn the Menu/Enter knob clockwise to navigate through the menu levels.
NOTE: To exit menu mode, you can select Exit in the menu, wait for the menu "timer" to expire, or press the PTT switch (from the microphone).
- Level 1: SET CLOCK, ALARM CLOCK, SET COUNT DOWN
- Level 2: KEY TONES, WX ALERT, WX ALERT SCAN
- Level 3: WX AUTO SCAN, DISPLAY COLOR, BRIGHTNESS
- Level 4: CONTRAST, RADIO CHECK, UTILITY
- Level 5: EXIT
Clock Adjustment
Use the clock, alarm, and countdown functions.
To set the clock, press the Menu/Enter button and select Set Clock.
NOTE: The normal display appears if the clock has not yet been set.
12:00 PM appears on the screen, and the hours flash. Turn the Menu/Enter knob clockwise to select the desired hour, then press the button to set the hour.
The minutes will then flash. Turn the Menu/Enter knob again to select the desired minutes, then press the button to set the minutes.
Once the minutes are set, AM or PM will flash. Turn the Menu/Enter knob again to select AM or PM, then press and release the button to exit the SET CLOCK menu.
NOTE: Use the PTT switch to exit any MENU level and return to CB standby mode.
Alarm Clock Adjustment
Your 29 LX radio can be used as an alarm clock.
To set the alarm clock, press the Menu/Enter button and select Alarm Clock.
Turn the Menu/Enter knob clockwise to select Set Alarm Time. Follow the instructions above to set the alarm time and AM or PM.
NOTE: The clock must be connected to a constant 12V power source to operate continuously.
Snooze and Alarm Length Adjustment
Once the alarm clock setting is complete, you can set the Set Snooze, Alarm Length, and Exit functions.
Enter the desired snooze time (from 1 to 60 minutes). Select Enter to exit and return to the alarm setting or alarm duration setting. Select the Alarm Length function to set the alarm duration (from 10 to 300 seconds). By pressing the Menu/Enter button, the unit will return to Exit, Set Snooze, or Alarm Length.
To set the clock, press the Menu/Enter button and select Set Clock.
NOTE: The default alarm snooze duration is 10 minutes.
NOTE: Use the PTT switch to exit any MENU level and return to CB standby mode.
NOTE: The default alarm duration is 60 seconds and is set in 10-second increments.
Countdown Timer Adjustment
To set the countdown timer, press the Menu/Enter button and select Set Count Down.
To use the countdown timer function, you must select Count Down (first menu option) and set it to ON by pressing and releasing the Menu button. Then, select Set Count Down and set the hours and minutes by turning the Menu knob to the desired time, then press and release it to save your settings.
NOTE: The clock must be connected to a constant 12V power source to operate continuously.
Key Tone Mode
Press the Menu/Enter button and turn it clockwise until Key Tones is displayed. Press the Menu/Enter button to select On/Off and exit the main menu.
Weather Information
What You Need to Know About the Weather
In the event of threatening weather conditions, the National Weather Service may issue a 10-second alert tone. This tone will be heard on the CB radio, even if the CB/WX control is in CB mode or the unit is turned off.
This allows you to monitor CB frequencies while continuing to receive emergency alerts from the National Weather Service. When you hear the alert, press the CB/WX/PA button in WX mode. You will then be able to hear the weather alert bulletin.
Your 29 LX radio is equipped with a special automatic squelch circuit for weather transmissions that disables your squelch control.
NOTE: If you wish to receive a list of NOAA weather radio transmitter locations, contact your nearest National Weather Service office. Otherwise, write to:
National Weather Service
(Attn: W/0M11) NOAA Silver Springs (Maryland) 20910.
For ideal weather reception, use a dual-band antenna (center-loaded/base-loaded).
Weather Channels
What is Weather Radio?
NOAA (NWR) Weather Radio is a service of the National Oceanic and Atmospheric Administration (NOAA), part of the U.S. Department of Commerce. A total of 380 NWR stations are operated by the U.S. government, in addition to several NWR stations operated by private interest groups. The service is intended to supplement warnings with sirens and commercial radio and television. The ten national weather channels provide complete coverage to keep you informed of weather conditions, 24 hours a day, 7 days a week.
NOTE: To exit menu mode, you can select Exit in the menu, wait for the menu "timer" to expire, or press the PTT switch (from the microphone).
Weather Alert Mode Setting
- Allows you to enable/disable (On/Off) WX alerts. The default is Off (disabled).
- Press the Menu/Enter button to select Set WX Alert. If weather is active, the WX alert icon will be displayed.
- Press the Menu/Enter button to select On/Off and exit the main menu.
Weather Alert Scan Setting
- Press the Menu/Enter button and turn it clockwise to WX Alert Scan. Press the Menu/Enter button to select On/Off.
- Press the Menu/Enter button to select On/Off and exit the main menu.
NOTE: If an alert is detected, the unit will activate WX mode on the channel with the alert. Use the Menu/Enter button to select On/Off and press the button to set.
Automatic Weather Scan
Automatic weather scan automatically searches for the weather station with the strongest signal in the background. Once the station is found, the scan remains on that active weather station, allowing you to instantly access weather information when you need it.
Automatic Weather Scan Setting
- Press the Menu/Enter button and turn it clockwise to WX Auto Scan. Press the Menu/Enter button to select On/Off.
- Press the Menu/Enter button to select On/Off and exit the main menu.
Display Color Adjustment
- Select the Menu/Enter button and scroll down to select the display color options. Two color choices are available: Day (Day) or Night (Night).
- Select Day (Day) or Night (Night) mode by turning the Menu/Enter knob. Press and release the Menu/Enter button to select.
- Turning the Menu/Enter knob clockwise changes the display color (from green to blue, to amber, to red, and back to green).
- Press the Menu/Enter button to select the color. Select Exit to return to the main menu.
NOTE: Use the PTT switch to return to CB standby mode.
NOTE: To exit menu mode, you can select Exit in the menu, wait for the menu "timer" to expire, or press the PTT switch (from the microphone).
Brightness Adjustment
Select the Menu/Enter button and scroll down, then select Brightness to adjust the level. Brightness can be set for Day (Day) and Night (Night) modes.
- To adjust, use the Menu/Enter knob to select Day (Day) or Night (Night) options. Press and release the button to select.
- Select the Day 1 or Day 2 option by pressing the Menu/Enter button. Turn the knob to adjust the brightness level.
- Select Exit to return to the previous Day (Day) or Night (Night) options, or press the microphone PTT button to return to CB mode (exit the menu completely).
Once the day options are set, you can switch between brightness levels using the DIM switch on the front panel.
NOTE: If you attempt to exceed the highest or lowest brightness level, an error beep will sound.
Contrast Adjustment
- Press the Menu/Enter button and turn it clockwise to select Set Contrast. Press the Menu/Enter button again and turn it clockwise to increase contrast and counter-clockwise to decrease it.
- Press the Menu/Enter button to set the contrast.
NOTE: If you attempt to exceed the highest or lowest contrast level, an error beep will sound.
NOTE: For optimal viewing, the contrast level should be set for each color.
Radio Check Mode
Allows you to test important radio functions.
Test 1 - Battery Level:
Confirms that the battery voltage is between 10.8V and 15.8V. If it is within this range, the message "PASS" will be displayed. Outside this range, the message "FAIL LOW" or "FAIL HIGH" will be displayed. Press the Menu/Enter button to proceed to the next test.
NOTE: Use the PTT switch to return to CB standby mode. The unit proceeds to the second test after 10 seconds or if you press the Enter button.
Test 2 - RF Output Power:
Confirms an output power of 3.3 to 4 watts. When you press the "Push-to-Talk" button, the message "PASS" or "FAIL" will be displayed if the power level is outside the limits.
NOTE: Press the Push-To-Talk button within 10 seconds, otherwise the unit will proceed to the next test. Press the Dim/Escape button to return to CB standby mode. The unit proceeds to the third test after 10 seconds or if you press the Enter button.
Test 3 - Antenna Mismatch Warning:
Press the "Push-to-Talk" button to check if the antenna/radio is properly matched.
NOTE: Use the PTT switch to return to CB standby mode. The test ends after 10 seconds or if you press the Enter button. The unit will then return to CB standby mode.
Utility Mode (Software Version and Reset)
Utility menu options allow you to display the current software version or restore the unit's factory settings. To display the software version, turn the Menu/Enter knob clockwise to select Settings, then Software Version.
- To restore factory settings, press the Menu/Enter button again. Turn the Menu/Enter knob clockwise to select Settings, then Go To Default (Go to default settings).
- Press the Menu/Enter button to restore factory settings. Choose NO (NON) to keep the current setting without change.
NOTE: The default display color is green.
Base Station Operation (from 120V AC Household Current)
To operate the transceiver from home or the office, you will need a 13.8-volt DC power supply with a minimum capacity of 2 amperes and a properly installed base station antenna.
WARNING: Do not attempt to operate this transceiver by connecting it directly to a 120V DC voltage source.
- Simply connect the red (+) and black (-) wires of the transceiver to the corresponding terminals of the power supply.
- Plug the power cord into the jack marked "POWER" on the back of the unit. Be sure to observe polarity markings.
- Connect a properly installed and matched base station antenna.
Temporary Mobile Use
For temporary mobile use, you can purchase an optional 12V power adapter and a magnetic mount antenna to allow you to quickly install your transceiver for temporary use.
To purchase accessories for mobile operations, visit cobra.com. Have questions? Call customer service at 1 800 543-1608.
Cobra offers mobile operation solutions that can be purchased online. Please visit www.cobra.com, or if you wish to speak with an expert, please call 1 800 543-1608 and a member of our customer service team can assist you.
How Your CB Radio Can Serve You
- Alert you to traffic problems
- Provide weather and road condition data
- Provide emergency assistance
- Provide direct contact with home or office
- Assist law enforcement in reporting erratic drivers
- Obtain "local information" to find friends
- Communicate with family and friends
- Suggest places to eat and sleep
- Help you stay alert while traveling
Some Rules to Know:
A. Conversations cannot last more than five minutes with another station. A one-minute pause is necessary to allow other people to use the channel.
B. You cannot exclude others from the airwaves by using illegally amplified transmitters or illegally high antennas.
C. You cannot use the CB radio to promote illegal activities.
D. Swearing is not permitted.
E. Transmitting music with a CB radio is prohibited.
F. The sale of merchandise and/or services is prohibited.
Setting Channel 9 for Emergencies
Ensure the antenna is properly connected.
CB Distress Data
When transmitting an emergency, you must request a "REACT BASE" and provide the CB distress data (called CLIP):
- C: All Sign (Call sign) - Identify yourself.
- L: Location (Emplacement) - Be precise.
- I: Injuries (Blessures) - Number. Type. Are you stuck?
- P: Problem (Problème) - Provide details and indicate the necessary help.
Transmit the CLIP data several times so that anyone monitoring can assist.
NOTE: If there is no response on channel 9, try channels 19 or 14.
Examples of Authorized and Prohibited Messages for Channel 9
Authorized | Example Message |
---|---|
Yes | "Tornado sighted six miles north of town." |
No | "Post number 10. No tornado sighted." |
Yes | "Out of gas on Interstate I-95 at mile marker 211." |
No | "I am out of gas in my driveway." |
Yes | "Accident involving four cars on Interstate I-94 at exit 11. Send police and ambulance." |
No | "Traffic is flowing smoothly on Interstate I-94." |
Yes | "Weather service issued a storm warning. Bring the sailboat to the harbor." |
No | "Attention motorists. Weather service predicts four to six inches of snow accumulation for tomorrow." |
Yes | "Fire in a building at 539 Main, Evanston." |
No | "Halloween patrol number 3. Nothing to report." |
10 CB Codes
Citizen Band radio users have adopted "10 CODES" for standard questions and answers. These codes allow for quick and easy communication, especially in noisy environments. Here are some of the most common codes and their meanings:
Code | Meaning | Code | Meaning |
---|---|---|---|
10-1 | Poor reception | 10-34 | Trouble at this station |
10-2 | Good reception | 10-35 | Confidential information |
10-3 | Stop transmitting | 10-36 | Correct time is |
10-4 | OK, message received | 10-37 | Need tow truck at |
10-5 | Relay message | 10-38 | Need ambulance at |
10-6 | Busy, stand by | 10-39 | Message delivered |
10-7 | Out of service, leaving | 10-41 | Switch to channel |
10-8 | In service, can receive calls | 10-42 | Traffic accident at |
10-9 | Repeat message | 10-43 | Traffic jam at |
10-10 | Transmission complete, standing by | 10-44 | Message for |
10-11 | Speak too rapidly | 10-45 | All units within range, please report |
10-12 | Visitors present | 10-50 | Break channel |
10-13 | Weather/road conditions advisory | 10-60 | What is the next message number? |
10-16 | Make pickup at | 10-62 | Cannot understand. Use phone |
10-17 | Urgent situation | 10-63 | Net directed to |
10-18 | Anything for us? | 10-64 | Net clear |
10-19 | Return to base | 10-65 | Awaiting your next message/traffic |
10-20 | My location is | 10-67 | All units comply |
10-21 | Call by phone | 10-70 | Fire at |
10-22 | Report in person at | 10-71 | Proceed, transmit in sequence |
10-23 | Standing by | 10-77 | Negative contact |
10-24 | Completed last tour of duty | 10-81 | Reserve hotel room for |
10-25 | Can you contact | 10-82 | Reserve room for |
10-26 | Disregard last information | 10-85 | My address is |
10-27 | Switch to channel | 10-91 | Talk closer to the mic |
10-28 | Identify your station | 10-93 | Check my signal on this channel |
10-29 | Time is expired for contact | 10-94 | Give your full call sign |
10-30 | Does not conform to FCC regulations | 10-99 | Mission completed, all units accounted for |
10-33 | Emergency traffic | 10-200 | Police need at |
Frequency Ranges
The Cobra 29 LX transceiver is part of the most advanced AM/FM two-way radios used as a Class D station in the Citizens Band radio service. These units are equipped with an advanced Phase-Locked Loop (PLL) circuit, providing full coverage of all 40 CB channels.
CB Channel | Channel Frequency in MHz | CB Channel | Channel Frequency 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 | 29 | 27.295 |
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 |
29 LX Radio Specifications
GENERAL
- CHANNELS: CB - 40 CHANNELS
- FREQUENCY RANGE: CB – 26.965 TO 27.405 MHz; WX - 162.400 TO 162.775 MHz
- FREQUENCY TOLERANCE: 0.005%
- FREQUENCY CONTROL: PLL SYNTHESIZER (PHASE-LOCKED LOOP)
- OPERATING TEMPERATURE RANGE: -30°C TO 50°C
- MICROPHONE: Dynamic, plug-in
- INPUT VOLTAGE: 13.2 VDC nominal (positive or negative ground)
- CURRENT CONSUMPTION: Transmit: Full modulation AM, 1.5 A (maximum); Receive: Silent, 0.3 A; Full audio output, 1.2 A (nominal)
- DIMENSIONS: 25.5 cm W x 18.5 cm D x 6.4 cm H (10.04 in L x 7.28 in D x 2.52 in H)
- WEIGHT: 1.52 kg (3.36 lb)
- ANTENNA CONNECTOR: UHF; SO-239 meter Indicates relative output power, received signal strength, and standing wave ratio
TRANSMITTER
- OUTPUT POWER: 4 watts
- MODULATION: AM (amplitude modulation) and FM (frequency modulation)
- FREQUENCY RESPONSE: 300 to 3,000 Hz
- OUTPUT IMPEDANCE: 50 ohms, unbalanced
RECEIVER
- SENSITIVITY: AM sensitivity less than 1uV for 10 dB (S+N)/N; FM sensitivity -116 dBm @ 12 dB SINAD typical
- 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 variation in audio output for 10 to 50,000 microvolts input
- RF GAIN CONTROL RANGE: 40 dB
- NOISE BLANKER: RF Type
- SQUELCH: Adjustable; threshold less than 1µV
- AUDIO OUTPUT POWER: 4 watts
- FREQUENCY RESPONSE: 300 to 3,000 Hz
- DISTORTION: Less than 7% @ 3 watts @ 1,000 Hz
- BUILT-IN SPEAKER: 8 ohms, 5W
- EXTERNAL SPEAKER (not supplied): 8 ohms; disables internal speaker when connected
PA (SOUND SYSTEM)
- OUTPUT POWER: 4 watts into an external speaker
- EXTERNAL SPEAKER for PA (not supplied): 8 ohms, minimum 4 watts. The PA speaker also controls the receiver; a separate jack is provided for this purpose.
(SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE)
Two-Year Limited Warranty
Warranty Conditions:
Cobra warrants its product against defects in materials and workmanship for a period of two (2) years from the date of original purchase.
Cobra, at its sole discretion, will repair or replace your product free of charge (with an identical or comparable product).
Cobra will not pay for shipping charges incurred to send us your product. C.O.D. products will be refused.
To make a warranty claim, we will need proof of purchase in the form of a bill of sale or receipt.
No proof of purchase is required for purchases made directly from the factory.
Warranty Exclusions:
The warranty does not apply to your product under the following situations:
- The serial number has been removed or altered.
- Your product has been misused or damaged (including water damage, physical abuse, and/or improper installation).
- Your product has been modified in any way.
- Your receipt or proof of purchase is from an unauthorized dealer or auction site, including E-bay, U-bid, or other unauthorized resellers.
LIMITATION OF WARRANTY:
EXCEPT AS EXPRESSLY PROVIDED HEREIN, YOU ARE ACQUIRING THE PRODUCT "AS IS" AND "WHERE IS," WITHOUT REPRESENTATION OR WARRANTY. COBRA DISCLAIMS ALL REPRESENTATIONS AND WARRANTIES, INCLUDING, BUT NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. COBRA SHALL NOT BE LIABLE FOR CONSEQUENTIAL, SPECIAL, OR INCIDENTAL DAMAGES, INCLUDING, BUT NOT LIMITED TO, DAMAGES ARISING FROM THE USE, MISUSE, OR INSTALLATION OF THE PRODUCT.
The limitations or exclusions above will be limited to the extent that they violate the laws of a particular country, state, or province. Cobra is not responsible for products lost in shipment between the owner and our service center.
General Warranty Information
Every product we manufacture is covered by our factory warranty. Although each product may have unique components and policies, the general guideline below will apply to most Cobra products.
All Cobra products purchased directly from the factory or from our authorized resellers will come with a comprehensive one- to three- (1-3) year warranty from the date of initial retail purchase (see policy statement above for full warranty details and exclusions).
Standard accessories packaged with each model will have a one-year factory warranty.
Accessories have a one-year factory warranty.
Shipping to our center is not covered by our warranty. Return shipping is included within the United States.
This warranty is not transferable.
For clarity, "repair or replace the defective product or part" does not include removal or reinstallation labor, costs, or expenses, including, but not limited to, labor costs or expenses.
Cobra is not responsible for lost shipments.
FCC Declaration
FCC Warning Statement Section 15.19
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES (FEDERAL COMMUNICATIONS COMMISSION). OPERATION IS SUBJECT TO THE FOLLOWING TWO 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.
FCC Warning Statement Section 15.21
NOTE: THE LICENSEE IS NOT RESPONSIBLE FOR ANY CHANGES OR MODIFICATIONS NOT EXPRESSLY APPROVED BY THE PARTY RESPONSIBLE FOR COMPLIANCE. SUCH MODIFICATIONS MAY VOID THE USER'S AUTHORITY TO OPERATE THE EQUIPMENT.
FCC Warning Statement Section 15.105
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
IC CNR-GEN, Section 8.4 Warning Statement
ENGLISH: This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.
FRANÇAIS: Cet appareil est conforme aux normes CNR exemptes de licence d'Industrie Canada. Le fonctionnement est soumis aux deux conditions suivantes : (1) cet appareil ne doit pas causer d'interférences, et (2) cet appareil doit accepter toute interférence, y compris celles pouvant entraîner un fonctionnement indésirable de l'appareil.
IC CNR-GEN, Section 8.3 Warning Statement
ENGLISH: This radio transmitter (identify the device by certification number, or model number if Category II) has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. Immediately following the above notice, the manufacturer shall provide a list of all antenna types approved for use with the transmitter, indicating the maximum permissible antenna gain (in dBi) and required impedance for each.
FRANÇAIS: Cet émetteur radio (identifiez l'appareil par numéro de certification, ou numéro de modèle si la catégorie II) a été approuvé par Industrie Canada pour fonctionner avec les types d'antennes énumérés ci-dessous avec le gain maximal admissible et l'impédance d'antenne requise pour chaque type d'antenne indiqué. Les types d'antennes non inclus dans cette liste, ayant un gain supérieur au gain maximal indiqué pour ce type, sont strictement interdits pour une utilisation avec ce dispositif. Immédiatement après l'avis ci-dessus, le fabricant doit fournir une liste de tous les types d'antennes approuvés pour utilisation avec l'émetteur, indiquant le gain d'antenne maximal admissible (en dBi) et l'impédance requise pour chacun d'eux.
IC CNR-GEN, Section 8.3 Warning Statement
ENGLISH: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 40cm between the radiator & your body. The device is in compliance with RF exposure guidelines, users can obtain Canadian information on RF exposure and compliance. The minimum distance from body to use the device is 40cm.
FRANÇAIS: Cet équipement est conforme aux limites d'exposition aux rayonnements de la FCC établies pour un environnement non contrôlé. Cet équipement doit être installé et utilisé avec une distance minimale de 40 cm entre le radiateur et votre corps. L'appareil est conforme aux lignes directrices sur l'exposition aux RF, les utilisateurs peuvent obtenir des renseignements canadiens sur l'exposition aux RF et la conformité. La distance minimale du corps pour utiliser l'appareil est de 40 cm.
Need Help?
If you have questions about the use or installation of your new Cobra product, PLEASE CONTACT COBRA FIRST... do not return this product to the store.
Cobra's contact information varies by country where the product was purchased and used. For the most current contact information, please visit www.cobra.com/support
For products purchased in the United States, call 1 800 543-1608.
If you have a problem with this product or need more information about its features, please visit www.cobra.com for assistance and to view frequently asked questions, compliance statements, and complete manuals.
For products purchased outside the U.S. or Canada
Please contact your local dealer for product repair information.
Replacement Parts and Accessories
PART/MODEL NUMBER | DESCRIPTION |
---|---|
251-353-9-001 | CB MOUNTING BRACKET |
741-001 | MICROPHONE SUPPORT |
426-002-N-001 | 122 cm (48 in) POWER CORD FOR 12 V |
634-081-9-001 | WING NUTS FOR MOUNTING BRACKET |
29LXMIC | REPLACEMENT 4-PIN MICROPHONE FOR 29 LX AM/FM RADIO |
HG M75 | 4-PIN HIGH-PERFORMANCE POWER MICROPHONE |
HG M73 | REPLACEMENT 4-PIN HIGH-PERFORMANCE DYNAMIC MICROPHONE |
HG M77 | REPLACEMENT 4-PIN NOISE-CANCELING MICROPHONE |
HG S500 | EXTERNAL DYNAMIC SPEAKER WITH NOISE FILTER AND RESPONSE FUNCTION |
HG S300 | EXTERNAL DYNAMIC SPEAKER WITH NOISE FILTER |
HG S100 | EXTERNAL DYNAMIC SPEAKER |
For replacement parts and accessories, visit www.cobra.com. Have questions or need help? Please call Cobra customer service at 1 800 543-1608.
About Cobra
For more information or to order any of our products, please visit our website: www.cobra.com
©2025 Cobra Electronics Corporation
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.
Patent: www.cobra.com/patent
AW-1210078-2A