Instruction/ maintenance manual of the product 21 LTD Cobra
Go to page of 11
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Please print clearly: Name __________________________________________________________________ Address (Not P . O. Box) ____________________________________________________ City ________________________________State____________Zip ________________ Telephone No.
An important point after buying a device Cobra 21 LTD (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Cobra 21 LTD yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Cobra 21 LTD - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Cobra 21 LTD you will learn all the available features of the product, as well as information on its operation. The information that you get Cobra 21 LTD will certainly help you make a decision on the purchase.
If you already are a holder of Cobra 21 LTD, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Cobra 21 LTD.
However, one of the most important roles played by the user manual is to help in solving problems with Cobra 21 LTD. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Cobra 21 LTD along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
