Instruction/ maintenance manual of the product 29 LTD ST Cobra Electronics
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OPERA TING INSTRUCTIONS FOR YOUR 40 CHANNEL CITIZENS BAND 2-W A Y MOBILE RADIO Model 29 L TD ST Cobr a Electr onics Corpor ation 6500 W . Cortland Street Chicago, IL 60707 PRINTED IN HONG KONG ©COBRA ELECTRONICS CORP .
The Citizens Band lies between the shortwave br oadcast 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 contr ol fr equencies.
Specifications (cont.) GENERAL Channels 40 Frequency Range 26.965 to 27.405 MHz. Fr equency Contr ol Phase Lock Loop (PLL) synthesizer . Frequency T olerance 0.005%. Operating T emperature Range -30¡ C to + 50¡ C. Microphone Plug-in dynamic. Input V oltage 13.
5 Installation (Cont.) 3. Connect the antenna cable plug to the standard r eceptacle 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 cor d to +13.
7 Installation (Cont.) Ignition Noise Interference Use of a mobile receiver at low signal levels is normally limited by the pr esence of electrical noise. The primary source of noise in automobile installations is fr om the alternator and ignition system in the vehicle.
Operation (Cont.) 9 6. DEL T A-TUNE. For normal operation, set this control to the center posi - tion. This feature has several uses and can gr eatly enhance receiver oper- ation. If a received signal is slightly of f frequency , the Delta-T une control can be used to Òfine-tuneÓ your receiver .
Operation (Cont.) 1 1 C. Rear Panel 1. PUBLIC ADDRESS: An external 8-ohm 4.0 watt P A speaker may be connect- ed to the P A Speaker Jack when this unit is used as a public addr ess system. The speaker should be directed away fr om the micr ophone to pr event acoustic feed-back.
13 12 Operation (Cont.) Operating Procedure to Receive 1. Be sure that the power cor d, antenna and micr ophone ar e connected to the proper connectors befor e proceeding further . The P A/CB should be in the CB position. 2. T urn the radio ON by rotating the VOLUME CONTROL clockwise.
15 14 Maintenance and Adjustment The COBRA CB transceiver is specifically designed for the environment encoun- ter ed in mobile installations. The use of all solid state cir cuitry and its light weight r esult in high r eliability .
Appendix (Cont.) A Few Rules That Should Be Obeyed 1 . Y ou a r e not allowed to carry on a conversation with another station for mo r e than five minutes at a time without taking a one-minute b r eak to give others a chance to use the channel.
W arranty and Service Limited T wo Y ear W arranty COBRA ELECTRONICS CORPORA TION warrants that its COBRA citizens band (CB) radio, and the component parts thereof, will be fr ee of defects in workmanship and materials for period of two (2) year from the date of first con - sumer purchase.
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