Cobra Electronics 21 LTD manual

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[...]

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[...]

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)[...]

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[...]

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[...]

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[...]

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[...]

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. [...]

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[...]

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[...]

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