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Manual Cobra 21 LTD

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  • Cobra 21 LTD - page 1

    OPERATING INSTRUCTIONS FOR YOUR 40 CHANNEL CITIZENS BAND 2-W A Y MOBILE RADIO Model 21 L TD ST Cobra Electronics Corporation 6500 W . Cortland Street Chicago, IL 60707 PRINTED IN HONG KONG ©COBRAELECTRONICS CORP. 1997 480-221-P-001 21LTDST.MANUAL.REV.QX 9/25/98 10:59 AM Page 1 ...

  • Cobra 21 LTD - page 2

    The Citizens Band lies between the shortwave broadcast and 10-meter Amateur radio bands, and was established by law in 1949. The Class D two-way commu- nications service was opened in 1959. (CB also includes a Class A citizens band and Class C remote control frequencies.) FCC regulations permit only “transmissions” (one party to another) rather ...

  • Cobra 21 LTD - page 3

    Specifications (cont.) GENERAL Channels 40 Frequency Range 26.965 to 27.405 MHz. Frequency Control Phase Lock Loop (PLL) synthesizer . Frequency Tolerance 0.005%. Operating Temperature Range -30° C to + 50° C. Microphone Plug-in dynamic. Input Voltage 13.8VDC nom.(positive or negative ground). Current Drain T ransmit : AM full mod., 1.5A(maximum) ...

  • Cobra 21 LTD - page 4

    5 Installation (Cont.) 3. Connect the antenna cable plug to the standard receptacle on the unit. Most CB antennas are terminated with a type PL-259 plug which mates with the r eceptacle marked "ANT." 4. Connect the red lead of DC power cord to +13.8 VDC. In automobile instal- lations, +13.8 VDC is usually obtained from the accessory conta ...

  • Cobra 21 LTD - page 5

    7 Installation (Cont.) Ignition Noise Interference Use of a mobile receiver at low signal levels is normally limited by the presence of electrical noise. The primary source of noise in automobile installations is from the alternator and ignition system in the vehicle. Under most operating conditions, when signal level is adequate, the background no ...

  • Cobra 21 LTD - page 6

    Operation (Cont.) 9 6. RX/TX LED INDICATOR . When your radio is in the CB receive mode, the LED will be green. When in transmit mode, the LED will be red. 7. LED CHANNEL DISPLA Y. The selected channel will be displayed. 8 . CB-P A SWITCH: Selects the mode of operation. In the CB position, the PA function is disabled and the unit will transmit and r ...

  • Cobra 21 LTD - page 7

    11 Operating Procedure to Receive 1. Be sure that the power cord, antenna and microphone are connected to the proper connectors before proceeding further. The PA/CB should be in the CB position. 2. T urn the radio ON by rotating the VOLUME CONTROL clockwise. 3. Set the RF GAIN CONTROLfully clockwise. 4. Set DEL T A-TUNE CONTROL to center(click-stop ...

  • Cobra 21 LTD - page 8

    13 12 Operation (Cont.) Operating Procedure to Transmit 1. Be sure the operator has read and understands part 95, F.C.C. Rules and Regulations prior to operating the transmitter . 2. Select the desired channel. 3. Set the DYNAMIKE control fully clockwise. 4. The receiver and transmitter are controlled by the press-to-talk switch on the microphone. ...

  • Cobra 21 LTD - page 9

    14 15 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 r esult 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 s ...

  • Cobra 21 LTD - page 10

    Appendix (Cont.) A Few Rules That Should Be Obeyed 1. Y ou are not allowed to carry on a conversation with another station for mor e than five minutes at a time without taking a one-minute break to give others a chance to use the channel. 2. Y ou are not allowed to blast others off the air by overpowering them with illegally amplified transmitter p ...

  • Cobra 21 LTD - page 11

    Please print clearly: Name __________________________________________________________________ Address (Not P . O. Box) ____________________________________________________ City ________________________________State____________Zip ________________ Telephone No. ( ____________) ____________________________________________ Credit Card No._____________ ...

Manufacturer Cobra Category Two-Way Radio

Documents that we receive from a manufacturer of a Cobra 21 LTD can be divided into several groups. They are, among others:
- Cobra technical drawings
- 21 LTD manuals
- Cobra product data sheets
- information booklets
- or energy labels Cobra 21 LTD
All of them are important, but the most important information from the point of view of use of the device are in the user manual Cobra 21 LTD.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Cobra 21 LTD, service manual, brief instructions and user manuals Cobra 21 LTD. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Cobra 21 LTD.

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A complete manual for the device Cobra 21 LTD, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Cobra 21 LTD by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Cobra 21 LTD.

A complete Cobra manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Cobra 21 LTD - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Cobra 21 LTD, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Cobra 21 LTD, that we can find in the current document
3. Tips how to use the basic functions of the device Cobra 21 LTD - which should help us in our first steps of using Cobra 21 LTD
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Cobra 21 LTD
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Cobra 21 LTD in a specific country, if it was not possible to solve the problem on our own.

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