Cobra 25 LTD AM-FM 25 LTD AM FM Professional CB Radio Owner’s Manual

Cobra 25 LTD AM-FM 25 LTD AM FM Professional CB Radio

Our Thanks, The CB Story, and Customer Assistance

Thank you for purchasing the Cobra 25 LTD AM/FM CB Radio Transceiver. Properly used, this Cobra product will give you many years of reliable service.

Citizens Band Radio History

• Invented by Al Gross in 1945, the CB radio originally served as a method of communication for troops during World War II. After the war, Gross worked to make two-way radios a way of communication
  for personal use and the CB radio service was established by law in the U.S. in 1949. It wasn’t until the 1970s that technology advanced and the CB market caught on as a method of communication between drivers to report police speed traps and road hazards.

• The Citizens Band Radio Service consists of 40 channel frequencies that are mostly 10 kHz apart. Transmitter power is limited to 4 watts in the US, and range can vary depending on the terrain and quality of the product.

• Currently, the Citizens Band service does not require a license for operation, regardless of age, as long as the rules of operation established by the Federal Communication Commission (FCC) are followed.

Petition For FCC Part 65 Rule Changes

• In 2016, Cobra petitioned the FCC to revise Part 95 rules to allow CB radios to use frequency modulation (FM). Cobra contended that FM offers improved speech quality and lower noise interference, which improves the standard of two-way radios and is a benefit to the customer.
• Through the direct efforts of Cobra Electronics and the enthusiastic support from loyal customers and the distribution network the FCC granted the request. In 2021, Part 95 officially was updated to include FM as an option for two-way radio use.
• 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 in a range of industries.

Customer Support
Should you encounter any problems with this product, not understand its features, menu or installation, please refer to the this owner’s manual. If you require further assistance, after reading this manual, we are here to help:

Service, Orders & Product Questions
For service, product questions and service hours call 800-543-1608 or go to www.cobra.com

For Assistance Outside the U.S.A.
Contact Your Local Dealer

25 LTD AM/FM Pro Series Features

Product Features

FCC Regulations

• Any changes or modifications not expressly approved by Cobra Electronics could void your authority to operate the equipment.
• 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 Compliance
• Any changes or modifications not expressly approved by Cobra Electronics could void your authority to operate the equipment.

Replacement Parts & Accessories

Installation

Location

• Plan for the location of the CB 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 to a convenient angle.

• The bracket includes two self-tapping screws and star washers. The mounting must be mechanically strong and conveniently located.

Mounting and Connection

1. Hold the radio with the mounting bracket in the exact desired location. If there is no interference, remove the bracket and use it as a template to mark the location for the mounting screws.

2. Drill the holes and secure the bracket.

3. Connect the antenna cable plug to the receptacle marked “ANT” 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.
   NOTE: Connecting to an accessory fuse prevents the unit from being left on accidentally, and also permits operating the unit without running the engine.

5. Connect the black lead to the negative side of the vehicle electrical system. This is usually the chassis.
   Any convenient location with a good electrical contact (remove paint) may be used.

NOTE: Before installing the CB radio, visually check the vehicle’s battery connection to determine which terminal is positive or negative. A negatively grounded vehicle has its negative lead grounded to the chassis.

6. Plug power cable into back of unit marked “Power”. Be sure to observe polarity markings.
7. The microphone can be mounted to either side of the CB using the supplied screws. Alternatively the microphone can be mounted to the dash or any convenient location.
8. Attach the microphone to the front of the CB.
   NOTE: If the microphone is not connected, audio will not be heard at the speaker.

Antennas

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. Consult your Cobra dealer for further details, or call 800-543-1608 and speak to a Cobra representative. A standard antenna connector is provided on the transceiver for easy connection.

• 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. Because many newer trucks feature fiberglass door skins, the outside mirror must be grounded to the chassis via a ground strap when the antenna is mounted on the mirror bracket.
• 3-way combination antennas are also available which allow reception on the AM and FM commercial broadcast bands and support receive and transmit operation on the CB radio band. However, this type of antenna usually results in less than optimal receive and transmit performance range when compared to a dedicated, high performance CB radio antenna.
• Cobra offers CB antenna and mounting solutions that can be purchased online.
• Please visit www.cobra.com, or if you’d like to speak with an expert, please call 1-800-543-1608 and our Customer Care Group can assist.

Operation

Turning On Your CB
Make sure the power cord, antenna and microphone are connected to their proper connectors before starting.

1. The CB/PA button should be in the CB position.
2. Rotate the On/Off Volume knob clockwise to a normal listening level.

Setting AM/FM

• The 25 LTD AM/FM CB allows for communications on either AM or FM modes.
• Each mode operates under Channels 1 – 40. AM is the default mode.
• To change between AM and FM modes move the AM/FM slide switch to the desired operating mode.
• Once selected a green indicator will appear to the right of the displayed channel and indicate you are in FM Mode.

Setting Channel Selector
Select one of forty channels. The selected channel is indicated by the LED readout directly above the channel selector knob.

To Receive
Rotate the On/Off Volume knob clockwise. While receiving the RX/TX LED will be illuminated and the lower portion of the meter will show the incoming signal strength.

S-Meter
The S-Meter swings proportionately to the strength of the incoming signal when receiving.

NB/OFF (Noise Blanker) Switch

• When switched to NB the RF Noise Blanker is activated, providing increased noise filtration.
• When switched to OFF all noise filtration will be turned off.
  NOTE: The RF noise blanker is very effective in reducing repetitive noises such as ignition interference.

Bright/Dim Switch
Switch to BRT or DIM to control the brightness of the channel indicator and multi-function meter for day or nighttime driving.

RF Gain Control

• The RF Gain is used to optimize reception in strong or weak signal areas.
• Rotate the RF Gain knob counterclockwise to reduce gain in strong signal areas. In weak signal areas turn clockwise to increase gain.

Setting Squelch
Squelch (SQ) is used to cut off or eliminate background noise in the absence of an incoming signal (when you are not talking).

1. Full clockwise rotation closes the “gate” allowing only very strong signals to enter.
2. Full counterclockwise rotation opens the “gate” allowing all signals in.
3. To achieve the Desired Squelch Setting (DSS), turn the Squelch control counterclockwise until you hear noise. Now turn the control clockwise just until the noise stops. This is the DSS.

To Transmit
Select the desired channel.
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 FCC Part 95 Rules and Regulations before transmitting.

Setting Dynamike®
This controls the microphone sensitivity (outgoing audio level).

1. Initially, set fully clockwise so that the maximum voice volume is available. Dynamike® may have to be reduced in some conditions.

2. Push and hold the mic button to transmit. When transmitting, hold the microphone two inches from your mouth and speak in a clear, normal voice. Release the mic button to receive.

RF Meter
This meter swings proportionately to the RF output (outgoing signal) while transmitting.

External Speaker

• Connecting an external speaker can provide louder and clearer incoming audio.

• Connect an external speaker to the external speaker jack on the rear panel.
  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.

• Cobra external speakers are rated at 10 watts.

PA (Public Address)

1. Connect an external PA speaker to the PA jack on the rear panel.
   NOTE: The speaker should have 8-ohm impedance and be rated to handle at least 4.0 watts.

2. Set the CB/PA switch to the PA position.
   NOTE: The speaker should be directed away from the microphone to prevent acoustic feedback.

3. Push and hold the microphone button and speak in a normal voice. Your voice will now transmit through the PA speaker.

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

ANL (Automatic Noise Limiter) Switch
When switched to CB/ANL the Automatic Noise Limiter is activated. This helps reduce noise created by the vehicle’s electronics.

Base Station Operation
(From 120V AC House Current)
To operate the transceiver from home or office you will need a 13.8 volt DC Power Pack rated at a minimum of 2 amps, and a properly installed base station antenna.
WARNING: Do not attempt to operate this transceiver by connecting it directly to 120VAC.

1. Simply connect the red (+) and black (-) leads of the transceiver to the corresponding terminals of the power pack.

2. Plug the power cable into the back of the unit marked “Power”. Be sure to observe polarity markings.

3. Connect a properly installed and matched base station antenna.

Temporary Mobile Operation
For temporary mobile operation you may want to purchase an optional automobile power adapter from your Cobra dealer. This adapter and a magnetic mount antenna allow you to quickly “install” your transceiver for temporary use.

How Your CB Can Serve You

Your CB Radio Can:

• 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:

• Conversations cannot last more than 5 minutes with another station. A one minute break is required to let others use the channel.
• You cannot blast others off the air by use of illegally amplified transmitters or illegally high antennas.
• You cannot use CB to promote illegal activities.
• Profanity is not allowed.
• You may not transmit music with a CB.
• Selling of merchandise and/or services is prohibited.

Set Channel 9 For Emergencies
Be sure antenna is properly connected.

CB Distress Data

• When transmitting an emergency, you should request a “REACT BASE” and provide the CB distress data (called CLIP):

• Transmit CLIP repeatedly so any monitor can assist.
  NOTE: If no response on channel 9, try channels 19 or 14.

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:

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. The following are some of the more common codes and meanings:

• 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
• 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

Frequency Ranges

The Cobra 25 LTD Classic transceiver represents some of the most advance AM/FM two-way radios used as a Class D station in the Citizens Band Radio Service. These model features an advanced Software Defined frequency synthesizer IC providing high stability coverage of all 40 CB channels.

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 power output and relative received signal strength
• 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
  • 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 @ 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

Limited 2-Year Warranty

Warranty Terms:

• Cobra warrants your product against all defects in materials and workmanship for a period of two (2) years from the date of original purchase.
• Cobra, at our sole discretion, will repair or replace your product (with the same or comparable product) free of charge.
• Cobra will not pay shipping charges that you incur for sending your product to us. Products received COD will be refused.
• To make a warranty claim, we will require proof or purchase in the form of an invoice or receipt.
• No proof of purchase is required for factory direct purchases.

Warranty Exclusions :

• Warranty does not apply to your product under any of the following conditions:
  1. The serial number has been removed or modified.
  2. Your product has been subjected to misuse or damage (including water damage, physical abuse, and/or improper installation).
  3. Your product has been modified in any way.
  4. Your receipt or proof-of-purchase is from a non-authorized dealer or internet auction site including E-bay, U-bid, or other nonauthorized resellers.
• LIMITATION OF WARRANTY: EXCEPT AS EXPRESSLY PROVIDED HEREIN, YOU ARE ACQUIRING THE PRODUCT “AS IS” AND “WHERE IS”, WITHOUT REPRESENTATION OR WARRANTY. COBRA SPECIFICALLY DISCLAIMS ANY REPRESENTATION OR WARRANTY INCLUDING, BUT NOT LIMITED TO THOSE CONCERNING THE MERCHANTABILITY AND SUITABILITY OF THE PRODUCT FOR A PARTICULAR PURPOSE. COBRA SHALL NOT BE LIABLE FOR CONSEQUENTIAL, SPECIAL OR INCIDENTAL DAMAGES INCLUDING, WITHOUT LIMITATION, DAMAGES ARISING OUT OF THE USE, MISUSE OR MOUNTING OF THE PRODUCT.
• The above limitations or exclusions shall be limited to the extent they violate the laws of any particular state. Cobra is not responsible for products lost in shipment between the owner and our service center.

General Warranty Information

• Each product we manufacture is covered by our factory warranty. While each product may have unique components and policy, the general guideline below will apply to most Cobra products.
• All Cobra products purchased factory-direct or from our Authorized Resellers will come with a full one to three (1-3) year warranty from the date of the original 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.
• Accessory items have a one-year factory warranty.
• Shipping to our facility is not covered in our warranty. Return shipping is included within the US.
• This warranty is non-transferrable.
• For the sake of clarity, ‘repair or replace the Product or its defective part’ does not include removal or installation work, costs or expenses which include but are not limited to labor costs or expenses.
• Cobra will not be responsible for lost packages.

Need Help?

• If you have any questions about operation or installing your new Cobra product, PLEASE CONTACT COBRA FIRST…do not return this product to any retail store.
• The contact information for Cobra will vary depending on the country in which you purchased and utilize the product. For the latest contact information, please go to www.cobra.com/support
• For products purchased in the U.S.A. you may call 800-543-1608.
• For products purchased in the U.S.A., if your product should require factory service, please please go to www.cobra.com/support and follow the instructions for returning your product to the Cobra Factory Service Department for service.
• Should there be any problems with this product or further information is needed on its features please visit www.cobra.com for support, frequently asked questions, Declarations of Conformity, and full manuals.
• For Products Purchased Outside the U.S.A. or Canada
• Please contact your local dealer for product service 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-
NOTE: 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
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 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
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.

IC RSS-GEN, Sec 8.3 Warning Statement

• 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.

RF Exposure Statement

• 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.

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