Cobra 29 LTD AM/FM Series Owner's Manual

Introduction

Our Thanks, The CB Story, and Customer Assistance

Thank you for purchasing the Cobra 29 LTD AM/FM Pro Series CB Radio Transceiver. This product is designed to provide many years of reliable service.

Citizens Band Radio History

The Citizens Band (CB) radio service was established in the U.S. in 1949, evolving from military communication needs. It gained popularity in the 1970s among drivers for reporting road conditions and hazards. The service consists of 40 channels, with transmitter power limited to 4 watts in the U.S. Operation does not require a license, provided Federal Communication Commission (FCC) rules are followed.

Petition For FCC Part 65 Rule Changes

In 2016, Cobra petitioned the FCC to allow CB radios to use frequency modulation (FM), citing improved speech quality and reduced noise interference. This petition was granted, and Part 95 rules were updated in 2021 to include FM as an option, enhancing the CB radio experience.

Customer Support

For assistance with product operation, features, or installation, please refer to this owner's manual. For further help, contact Cobra customer support:

• Service, Orders & Product Questions: Call 800-543-1608 or visit www.cobra.com.
• Assistance Outside the U.S.A.: Contact your local dealer.

Product Features

The Cobra 29 LTD AM/FM Pro Series offers advanced features for communication. Key components include:

• Signal Strength Meter (S/RF)
• SWR Meter
• Noise Blanker/Automatic Noise Limiter (NB/ANL) Switch
• Bright/Dim Switch
• CB/PA Switch
• Channel 9/Normal Switch
• RX/TX LED Indicator
• LED Channel Display
• AM/FM Mode Indicator
• Volume/Squelch Control
• Dynamike® Control
• RF Gain Control
• Delta Tune Control
• SWR CAL Control
• 4-Pin Microphone Connector
• Power On/Off Switch
• Public Address (PA) Jack
• External Speaker Jack
• Antenna Connector
• Power Jack
• Push-To-Talk (PTT) Button

FCC Compliance

This device complies with Part 15 of the FCC rules. Operation is subject to two conditions: it must not cause harmful interference, and it must accept any interference received. Modifications not expressly approved by Cobra Electronics may void the user's authority to operate the equipment.

Industry Canada (IC) Compliance: 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. (French: Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.)

RF Exposure Statement: This equipment complies with FCC radiation exposure limits for an uncontrolled environment. It should be installed and operated with a minimum distance of 40cm between the radiator and your body. (French: 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.)

Installation

Location

Select a convenient operating location that does not interfere with the driver or passenger. The transceiver is typically mounted under the dash with the microphone bracket beside it. The universal mounting bracket allows for angle adjustment via thumbscrews. The bracket includes self-tapping screws and star washers for secure mounting.

Mounting and Connection

1. Position the radio and mounting bracket. If no interference, use the bracket as a template to mark screw locations.
2. Drill holes and secure the bracket.
3. Connect the antenna cable plug to the "ANT" receptacle on the back of the unit.
4. Connect the red lead of the DC power cord to an accessory 12-volt fuse or directly to the battery. Connecting to an accessory fuse prevents accidental battery drain.
5. Connect the black lead to the negative side of the vehicle's electrical system (usually the chassis). Ensure a good electrical contact, removing paint if necessary. Verify vehicle's battery polarity before connecting.
6. Plug the power cable into the unit's "Power" jack, observing polarity markings.
7. Mount the microphone to either side of the CB or any convenient location using the supplied screws.
8. Attach the microphone to the front of the CB. If the microphone is not connected, no audio will be heard.

Antennas

The antenna is critical for transmission distance, as transmitter power is FCC limited. A properly matched antenna system is essential for maximum power output. Cobra loaded type antenna models are recommended. For optimum performance in passenger cars, mount the antenna on the center of the roof or trunk. For trucks with fiberglass door skins, ensure the outside mirror is grounded to the chassis via a ground strap. 3-way combination antennas are available but may offer less range than single-band antennas. Cobra offers CB antennas and mounting solutions online at www.cobra.com.

Operation

Turning On Your CB

Ensure the power cord, antenna, and microphone are properly connected. Set the CB/PA button to the CB position. Rotate the On/Off Volume knob clockwise to a normal listening level.

Setting AM/FM

The 29 LTD Series supports both AM and FM modes on Channels 1-40. AM is the default. To switch to FM, press and release the channel selector knob. A green indicator next to the channel number confirms FM mode.

Setting Channel Selector

Select any of the forty channels. The selected channel is indicated by the LED readout above the channel selector knob.

Calibrate for SWR (Standing Wave Ratio)

SWR calibration adjusts antenna length and monitors coaxial cable/RF connection quality for optimal performance. Perform calibration in an open area (not a garage) with vehicle doors closed and no one near the antenna.

1. Select Channel 20.
2. Switch the S/RF-SWR-CAL knob to the CAL position. The Antenna Indicator LED will illuminate when transmitting if SWR is high.
3. Push and hold the microphone button.
4. While holding the mic button, adjust the SWR CAL knob so the meter needle swings to the CAL mark.
5. While still holding the mic button, set the S/RF-SWR-CAL switch to the S/RF position and then to SWR to read the SWR value.
6. Repeat steps 2-5 for Channels 1 and 40.

Note: SWR readings may be slightly higher on Channels 1 and 40. An SWR reading over 3 is not acceptable. Adjust antenna height (higher or lower) as needed and repeat recalibration.

To Receive

Rotate the On/Off Volume knob clockwise. The RX/TX LED illuminates during reception, and the lower portion of the meter indicates incoming signal strength.

S-Meter

The S-Meter indicates received signal strength. Ensure the S/RF-SWR-CAL switch is in the S/RF position.

NB-ANL/ANL/OFF (Noise Blanker/Automatic Noise Limiter) Switch

• ANL: Activates the Automatic Noise Limiter to reduce vehicle electronics noise.
• NB/ANL: Activates both the RF Noise Blanker and ANL for increased noise filtration.
• OFF: Disables all noise filtration.

Note: The RF noise blanker is effective against repetitive noises like ignition interference.

Bright/Dim Switch

Use the BRT or DIM setting to adjust the brightness of the channel indicator and multi-function meter for day or nighttime driving.

RF Gain Control

Optimizes reception in strong or weak signal areas. Turn counterclockwise to reduce gain in strong signal areas; turn clockwise to increase gain in weak signal areas.

Setting Delta Tune (29 LTD/29 LTD Chrome)

Delta-Tune acts as a fine-tuning control to improve intelligibility and eliminate adjacent channel interference. Rotate the Delta Tune knob to the center position for optimal tuning.

Setting TalkBack (29 LTD Chrome)

Adjusts the desired amount of modulation talk-back heard through the speaker during transmit. Turning the knob fully counterclockwise turns talk-back off.

Dimmer Control (29 LTD NightWatch®)

Controls the brightness of the front panel, signal strength meter, and channel display. Rotate clockwise for maximum brightness, counterclockwise for minimum.

Setting Squelch

Squelch (SQ) eliminates background noise when no signal is present. 1. Full clockwise rotation closes the "gate", allowing only strong signals. 2. Full counterclockwise rotation opens the "gate", allowing all signals. 3. To set the Desired Squelch Setting (DSS), turn the Squelch control counterclockwise until noise is heard, then turn clockwise just until the noise stops.

To Transmit

1. Select the desired channel. Caution: Ensure the antenna is properly connected before transmitting. Transmitting without an antenna or with a poorly matched antenna can damage the transmitter. Review FCC Part 95 Rules and Regulations before transmitting.

Set Dynamike®

Controls microphone sensitivity (outgoing audio level). Set fully clockwise initially for maximum voice volume. Adjust lower if necessary. To transmit, push and hold the microphone button, speaking clearly about two inches from the microphone. Release the button to receive.

RF Meter

This meter indicates RF output (outgoing signal) while transmitting. The S/RF-SWR-CAL switch must be in the S/RF position.

External Speaker

An optional external speaker provides louder, clearer audio. Connect it to the external speaker jack on the rear panel. The external speaker should have 8-ohm impedance and handle at least 4.0 watts. Connecting an external speaker automatically disconnects the internal speaker. Cobra external speakers are rated at 10 watts.

PA (Public Address)

1. Connect an external PA speaker (8-ohm, minimum 4.0 watts) to the PA jack on the rear panel.

2. Set the CB/PA switch to the PA position.

3. Speak into the microphone while holding the button. Your voice will transmit through the PA speaker. Direct the speaker away from the microphone to prevent acoustic feedback.

4. Adjust PA speaker volume using the Dynamike® control.

Base Station Operation

To operate from a 120V AC house current, use a 13.8V DC Power Pack (minimum 2 amps) and a properly installed base station antenna. Warning: Do not connect directly to 120VAC.

1. Connect the red (+) and black (-) leads of the transceiver to the power pack's corresponding terminals.
2. Plug the power cable into the unit's "Power" jack, observing polarity.
3. Connect a properly installed and matched base station antenna.

Temporary Mobile Operation

For temporary mobile use, consider an optional automobile power adapter and magnetic mount antenna from Cobra to quickly install the transceiver.

Using Your CB Radio

How Your CB Can Serve You

Your CB Radio can:

• Warn of traffic problems
• Provide weather and road data
• Assist in emergencies
• Facilitate direct contact with home or office
• Help report erratic drivers
• Provide local information
• Communicate with family and friends
• Suggest dining and lodging spots
• Enhance alertness while traveling

A Few Rules You Should Know

• Conversations cannot exceed 5 minutes per station, with a 1-minute break required.
• Do not use illegal amplification or high antennas to disrupt others.
• Do not use CB for illegal activities.
• Profanity is not allowed.
• Do not transmit music.
• Selling merchandise or services is prohibited.

Set Channel 9 For Emergencies

Ensure the antenna is properly connected. When transmitting an emergency, request a "REACT BASE" and provide CB distress data (CLIP): Call Sign, Location (be exact), Injuries (number, type, trapped?), and Problem (details and help needed). Transmit CLIP repeatedly. If no response on channel 9, try channels 19 or 14.

Permitted and Prohibited Messages for Channel 9

The FCC provides examples of permitted and prohibited messages for channel 9. These are guidelines and not exhaustive:

Reference Information

CB 10-Codes

Citizen Bands use "10-CODES" for quick and easy communication. Common codes include:

Frequency Ranges

The Cobra 29 LTD Pro Series covers all 40 CB channels using advanced Phase Lock Loop (PLL) circuitry.

Specifications

General

• Channels: CB - 40 CH
• Frequency Range: CB - 26.965 to 27.405 MHz
• Frequency Tolerance: 0.005%
• Frequency Control: PLL (phase lock loop) Synthesizer
• Operating Temperature Range: -30° C to +50° C
• Microphone: Plug-in dynamic
• Input Voltage: 13.8VDC nom. (negative ground)
• Current Drain: Transmit: AM full mod., 1.5A (maximum); Receive: Squelched, 0.3A; full audio output, 1.2A (nominal)
• Size: 2.25" D x 7.25" W x 9.25" H
• Weight: 5.6 lbs.
• Antenna Connector: UHF; SO-239
• Meter: Illuminated; indicates relative power output, received signal strength and VSWR

Transmitter

• Power Output: 4 watts
• Modulation: AM (Amplitude Modulation) and FM (Frequency 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 @ 10 kHz
• 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 Control: Adjustable for optimum signal reception
• Noise Blanker: RF type
• Squelch: Adjustable; threshold less than 1µV
• Audio Output Power: 4 watts
• Frequency Response: 300 to 3000 Hz
• Distortion: Less than 5% @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, when PA-CB switch is in PA

(Specifications subject to change without notice)

Warranty and Support

Limited 2-Year Warranty

Cobra warrants this product against defects in materials and workmanship for two years from the original purchase date. Cobra will, at its discretion, repair or replace the product free of charge. Shipping charges for returns are not covered. Proof of purchase (invoice or receipt) is required for warranty claims, except for factory direct purchases.

Warranty Exclusions

Warranty does not apply if the serial number is removed/modified, the product is misused, damaged (including water, physical abuse, improper installation), or modified. It also excludes purchases from unauthorized dealers or auction sites.

Limitation of Warranty

Cobra disclaims all warranties, express or implied, including those of merchantability and fitness for a particular purpose. Cobra is not liable for consequential, special, or incidental damages arising from the product's use, misuse, or mounting.

General Warranty Information

Most Cobra products come with a one to three-year factory warranty from the original retail purchase date. Standard accessories and accessory items have a one-year factory warranty. Return shipping within the U.S. is included. This warranty is non-transferable. Repair or replacement does not include installation or removal costs.

Need Help?

For questions about operation or installation, contact Cobra first. For the latest contact information, visit www.cobra.com/support.

• U.S.A. Purchases: Call 800-543-1608. For factory service, follow instructions at www.cobra.com/support.
• Outside U.S.A. or Canada: Contact your local dealer for service information.

29 LTD Series Features Comparison

A comparison of features across different Cobra 29 LTD models:

Regulatory Information

FCC Statement

FCC Part 15.19 Warning Statement: THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. 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 Part 15.21 Warning Statement: The grantee is not responsible for any changes or modifications not expressly approved by the party responsible for compliance. Such modifications could void the user's authority to operate the equipment.

FCC Part 15.105(b) Warning Statement: 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 receiver; Connect the equipment into 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 RSS-GEN, Sec 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.

French: Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

IC RSS-GEN, Sec 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.

French: Le présent émetteur radio (identifier le dispositif par son numéro de certification ou son numéro de modèle s'il fait partie du matériel de catégorie I) a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés ci-dessous et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.

RF Exposure 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.

French: 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. Après examen de ce matériel aux conformité ou aux limites d'intensité de champ RF, les utilisateurs peuvent sur l'exposition aux radiofréquences et compliance d'acquérir les informationscorrespondantes. La distance minimale du corps à utiliser le dispositif est de 40cm.