Instruction/ maintenance manual of the product 25 LTD ST Cobra Electronics
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OPERA TING INSTRUCTIONS FOR YOUR 40 CHANNEL CITIZENS BAND 2-W A Y MOBILE RADIO Model 25 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 5. RF GAIN. Adjust as required to optimize signal. This contr ol is used primarily to optimize reception in str ong signal areas. Gain is reduced by counter clockwise r otation of the contr ol. 6 . CHANNEL SELECTOR SWITCH. This switch selects any one of forty Citizens Band channels desired.
1 1 3. ANTENNA CONNECTOR: This SO-239 connector permits connection of the transmission line cable PL-259 connector to the transceiver . 4. POWER. This jack permits connection of the DC power to the transceiver . A power cord with polarized plug is supplied with the radio.
13 12 Operation (Cont.) Operating Procedure to T ransmit 1. Be sure the operator has r ead 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- ter ed in mobile installations. The use of all solid state cir cuitry and its light weight r esult in high r eliability . Should a failure occur , however , review the following, then if necessary , r eplace parts only with identical parts.
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 18 19 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 workman- ship and materials for period of two (2) year fr om the date of first consumer pur- chase.
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