Cobra Electronics 21 LTD Maintenance and Adjustment, Appendix, Adjustment Warning, Code Meaning

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Make certain the microphone is properly plugged in.

21LTDST.MANUAL.REV.QX 9/25/98 10:59 AM Page 17

Maintenance and Adjustment

The COBRA CB transceiver is specifically designed for the environment encoun- tered in mobile installations. The use of all solid state circuitry and its light weight result in high reliability. Should a failure occur, however, review the following, then if necessary, replace parts only with identical parts. Do not substitute. Refer to the schematic diagram and parts.

1. Check connections to the source of power and make sure it is the 13.8 VDC required to operate your radio.

2. Check the fuse in the DC power cord. The main power lead (red wire) has a 2 Amp 3AG type fuse in its holder. Use only the above specified type and size fuse for maximum protection. Failure to do so, will void the warranty.

3.

4. Make certain the antenna is properly connected and tuned for minimum SWR. NOTE: COBRA antennas include full instructions as to how to tune your antenna. If you're still in doubt about the procedure, contact the COBRA dealer from whom you purchased your radio and antenna, for advice. If you hired an installer to install your radio and antenna, contact the installer.

If you are unable to correct the problem, refer the WARRANTY SERVICE INSTRUCTIONS at the end of this manual for the correct procedure for warranty and post-warranty service from COBRA.

Adjustment Warning

Replacement or substitution of certain parts with replacements other than those recommended by COBRA, may be a violation of the technical regulations of Part 95 of the FCC Rules, or of Type Acceptance requirements of Part 2 of said rules.

When making adjustments other than transmitter adjustments, be sure to re-read applicable portions of this instruction manual to make certain you are following correct procedure and that the radio was properly installed, etc.

For technical assistance, please call our Automated Help Desk

which can assist you by answering the most

frequently asked questions about Cobra products.

(773) 889-3087

24 hours a day, 7 days a week.

A Consumer Service Representative can be reached through this same

number 8:00 am - 8:00 pm, Monday through Friday, CST.

Technical assistance is also available on-line in the Frequently Asked

Question (FAQ) section at www.cobraelec.com or by e-mail

to productinfo@cobraelec.com

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Appendix

Citizens Band radio operators have largely adopted the 10-code for standard questions and answers. Its use permits faster communications and better under- standing in noisy areas. The following table lists some of the more common codes and their meanings:

Code

Meaning

Code

Meaning

10-1

Receiving poorly

10-35

Confidential information

10-2

Receiving well

10-36

Correct time is

10-3

Stop transmitting

10-37

Wrecker needed at

10-4

OK, message received

10-38

Ambulance needed at

10-5

Relay message

10-39

Your message delivered

10-6

Busy, stand by

10-41

Please turn to channel

10-7

Out of service, leaving air

10-42

Traffic accident at

10-8

In service, subject to call

10-43

Traffic Tie up at

10-9

Repeat message

10-44

I have a message for you

10-10

Transmission completed,

10-45

All units within range

 

standing by

 

please report

10-11

Talking too rapidly

10-50

Break channel

10-12

Visitors present

10-60

What is next message number?

10-13

Advise Weather/Road

10-62 Unable to copy, use phone

 

conditions

10-63

Net directed to

10-16

Make pick up at

10-64

Net clear

10-17

Urgent business

10-65

Awaiting your next

10-18

Anything for us?

 

message/assignment

10-19

Nothing for you, return

10-67

All units copy

 

to base

10-70

Fire at

10-20

My location is

10-71

Proceed with transmission

10-21

Call by telephone

 

in sequence

10-22

Report in person to

10-77

Negative contact

10-23

Stand by

10-81 Reserve hotel room for

10-24

Completed last assignment

10-82

Reserve room for

10-25

Can you contact

10-84 My telephone number is

10-26

Disregard last information

10-85

My address is

10-27

I am moving to channel

10-91

Talk closer to mike

10-28

Identify your station

10-93 Check my frequency on

10-29

Time is up for contact

 

this channel

10-30

Does not conform to FCC rules

10-94 Please give me a long count

10-32

I will give you a radio check

10-99

Mission completed, all

10-33

EMERGENCY TRAFFIC

 

units secure

10-34

Trouble at this station

10-200

Police needed at

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Contents Citizens Band WAY Mobile Radio Cuts Static coming in, adds Punch going out CB StorySpecifications ChannelMHz Installation LocationMounting and Connection Ignition Noise Interference CB AntennaBase Station Operation Operation from 120VAC, House Current Temporary Mobile OperationControls and Indicators OperationFront Panel Operating Procedure to Receive Press-To-Talk MicrophoneRear Panel How SoundTracker Works Operating Procedure to TransmitAdjustment Warning Maintenance and AdjustmentAppendix Code MeaningIf You Think You Need Service Few Rules That Should Be ObeyedHow Your CB Can Serve You Limited Two Year Warranty Warranty and Service

21 LTD specifications

Cobra Electronics 21 LTD is a versatile Citizen Band (CB) radio designed for seamless communication in a wide array of environments, making it a staple for truck drivers, outdoor enthusiasts, and hobbyists alike. Known for its reliability and quality, the 21 LTD combines advanced technology with user-friendly features, ensuring clear and efficient communication.

One of the standout features of the Cobra 21 LTD is its compact design, which makes it easy to install in trucks, cars, and even boats. Despite its small size, it accommodates a comprehensive 40-channel system, allowing users to select from various frequencies, ensuring they can find optimal communication channels regardless of their location.

Equipped with a powerful, built-in noise-canceling microphone, the 21 LTD is adept at minimizing background noise, producing crystal-clear audio even in noisy environments. This feature is particularly beneficial for truck drivers traversing busy highways, ensuring that both transmitted and received messages maintain high quality. Additionally, the radio boasts Automatic Noise Limiting (ANL) technology, which further enhances sound quality by reducing static and interference.

The Cobra Electronics 21 LTD also includes a front-firing speaker for improved audio clarity and a large, easy-to-read analog gauge for channel selection and signal strength monitoring. This design enhances operational convenience, allowing users to stay focused on the road while effortlessly adjusting settings.

Another notable characteristic is the inclusion of a PA (Public Address) feature, which enables users to connect an external speaker. This is especially useful for communicating with larger groups or providing instructions at job sites. Furthermore, the radio features a built-in SWR (Standing Wave Ratio) meter, an essential tool for ensuring proper antenna alignment and optimizing signal performance.

In terms of durability, the Cobra 21 LTD is designed to endure the rigors of outdoor use, featuring a robust construction that can withstand vibrations and varying weather conditions. With an easy installation process and compatibility with various microphones and accessories, this radio is perfect for both seasoned CB users and newcomers.

In conclusion, the Cobra Electronics 21 LTD is a powerful and reliable CB radio that boasts numerous user-friendly features, advanced technologies, and rugged characteristics. Whether for long hauls, outdoor adventures, or casual communication, the 21 LTD stands out as a top choice for those who value quality and convenience.