User manual COBRA 21LTDST

[. . . ] 21LTDST. MANUAL. REV. QX 9/25/98 10:59 AM Page 1 OPERATING INSTRUCTIONS FOR YOUR 40 CHANNEL CITIZENS BAND 2-WAY MOBILE RADIO Model 21 LTD 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 3 How To Use Your The CB Story The Citizens Band lies between the shortwave broadcast and 10-meter Amateur radio bands, and was established by law in 1949. (CB also includes a Class A citizens band and Class C remote control frequencies. ) FCC regulations permit only "transmissions" (one party to another) rather than "broadcasts" (to a wide audience). [. . . ] Further clockwise rotation will increase the threshold level which a signal must overcome in order to be heard. This control is used primarily to optimize reception in strong signal areas. The selected channel is indicated by the LED readout, directly above the channel selector knob. 4. 5. 8 9 21LTDST. MANUAL. REV. QX 9/25/98 10:59 AM Page 13 Operation (Cont. ) B. Press-To-Talk Microphone Both the receiver and transmitter are controlled by the Press-to-Talk switch on the microphone. Press the switch and the transmitter is activated; release the switch to receive. When transmitting, hold the microphone two inches from the mouth and speak clearly in a normal voice. The microphone provided with your radio is a detachable low-impedance dynamic type. Operation (Cont. ) Operating Procedure to Receive 1. 8. Be sure that the power cord, antenna and microphone are connected to the proper connectors before proceeding further. Rotate SQUELCH CONTROL counterclockwise until incoming signal is heard. Turn the SQUELCH CONTROL slowly clockwise until the noise JUST disappears (no signal should be present). Do not advance the control too far, or some of the weaker signals will not be heard. The revolutionary SoundTracker system allows you to reduce unwanted background noise (static) and increase the signal for better reception. 3 1 2 4 C. Rear Panel 1. PUBLIC ADDRESS: An external 8-ohm 4. 0 watt PA speaker may be connected to the PA Speaker Jack when this unit is used as a public address system. The speaker should be directed away from the microphone to prevent acoustic feed-back. Physical separation or isolation of the microphone and speaker must be employed when operating the PA at high output levels. EXTERNAL SPEAKER: The External Speaker Jack is used for remote receiver monitoring. 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. ANTENNA CONNECTOR: This SO-239 connector permits connection of the transmission line cable PL-259 connector to the transceiver. The polarized plug ensures that the power will always be connected properly. 2. 3. 4. 10 11 21LTDST. MANUAL. REV. QX 9/25/98 10:59 AM Page 15 Operation (Cont. ) Operating Procedure to Transmit How SoundTracker Works SOUNDTRACKER SYSTEM While previous systems only "blanked out" or limited noise in higher sound frequencies, the revolutionary new SoundTracker System actually reduces noise while leaving the signal intact in the reception mode. [. . . ] If you have any questions, please call 773-889-3087 for assistance. How Your CB Can Serve You · Warn of traffic tie ups ahead. · Provide "local information" to find you destination. · Help law enforcement officers by reporting drunk and reckless drivers. 6. For technical assistance, please call our Automated Help Desk which can assist you by answering the most frequently asked questions about Cobra products. A Consumer Service Representative can be reached through this same number 8:00 am - 8:00 pm, Monday through Friday, CST. [. . . ]