Instruction/ maintenance manual of the product 148.GTL.ST Cobra Electronics
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PRINTED IN THAILAND ©COBRA ELECTRONICS CORPORATION 1997 480-241-P-001 Cobra Electronics Corporation 6500 W . Cortland Street Chicago, IL 60707 OPERATING INSTRUCTIONS FOR Y OUR 40 CHANNEL CITIZENS BAND SSB/AM 2-W A Y MOBILE RADIO Model 148 GTL ST 148.
40-CHANNEL, CITIZENS BAND SSB/AM 2-W A Y MOBILE RADIO Model 148 GTL ST Contents P age The CB/SoundT r acker Story .............................................................. 1 Section I: Introduction.................................................
Section I Introduction FREQUENCY RANGE T he COBRA 148 GTL ST transcei v er represents one of the most ad v anced SSB/AM two-w a y radios ever designed for use as a Class D station in the Citizens Radio Service.
Section II Specifications (Cont.) 4 RECEIVER Sensitivity SSB: 0.25 µ V for 10dB (S+N)/N at greater than 1/2-watt of audio output. AM: 0.5 µ V for 10 dB (S+N)/ at greater than 1/2-watt of audio output. Selectivity AM: 6dB @ 3 KHz, 50 dB @ 9 KHz. SSB: 6 dB @ 1.
6 Section III Installation IGNITION NOISE INTERFERENCE Use of a mobile recei v er at low signal levels is normally limited by the presence of electrical noise. T he primary source of noise in automobile installations is from the generator and ignition system in the vehicle.
Section III Installation (Continued) D. T ry a different location on your car (keeping in mind the radiation pattern you wish). E. Is the antenna perfectly vertical? F . T ry a different location in your neighborhood. Stay a w ay from large metal objects when adjusting (metal telephone or light posts, fences, etc.
Section IV Operation (Continued) 4. SWR CAL CONTROL (outer concentric dial) . In order for you to achiev e maximum radiated power and the longest range, it is important that your antenna be in good condition, properly adjusted and matched to your trans- ceiver .
12 Section IV Operation (Continued) B. INDICA TOR FUNCTIONS 15. S-METER. Swings proportionally to the strength of the incoming signal. 16. RF METER . Swings proportionally to the RF output power . 17. SWR METER . Sw i ng s p r o po r t io n a l ly to t he r a ti o o f s t an d i n g w a ve v o l ta ge a nd RF ou tpu t .
14 Section IV Operation (Continued) T hus when a voice is used in place of a whistle or tone, in the proper listening mode the voice will be recei v ed correctly whereas in the incorrect mode, the v oice will be translated backwards and cannot be made intelligible by the voice lock control.
16 3 4 2 1 Section IV Operation (Continued) Fig. 2. Microphone Cable Preparation T o wire the microphone cable to the plug provided, proceed as follows. Fig. 3 . Microphone plug wiring. 1. Remove the retaining screw. 2. Unscrew the housing from the pin receptacle bod y .
18 Section V Maintenance and Adjustment T he COBRA 148 GTL ST transcei v er is specifically designed for the environment encountered in mobile installations. T he use of all solid state circuitry and its light weight result in high reliability. Should a failure occur, however, replace parts only with identical parts.
Activ ating/Testing SoundT r acker ACTIV A TING SOUNDTRACKER 1. Press the SoundTracker button on the right side of front panel. TESTING SOUNDTRACKER 1. Select any unused channel on your CB . 2. Open the squelch fully by turning the knob counter-clockwise until it stops.
22 Section VI Appendix (Continued) A FEW RULES THAT SHOULD BE OBEYED 1. Y ou are not allowed to carry on a con v ersation with another station for more than fiv e minutes at a time without taking a one-minute break, to gi v e others a chance to use the channel.
If Y ou T hink Y ou Need Service If Y ou T hink Y ou Need Service, Call 773-889-3087 Y ou m a y be aske d to send you r uni t to the Cobr a f actor y . It will b e neces sar y to fur nis h th e follo wi ng, in or der to ha ve the pr oduc t ser vic ed and r e t u r n e d .
Description Part No. Cost Ea. X Qty. = Amount Replacement microphone with 4-pin connector for 148 GTL ST CA-73 $19.95 MOBILE POWER MICROPHONE Amplified Power Microphone with 4-pin connector for 148 GTL ST CA-75 $19.95 NOISE CANCEL MICROPHONE for 148 GTL ST CA-77 $39.
An important point after buying a device Cobra Electronics 148.GTL.ST (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 Electronics 148.GTL.ST 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 Electronics 148.GTL.ST - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Cobra Electronics 148.GTL.ST you will learn all the available features of the product, as well as information on its operation. The information that you get Cobra Electronics 148.GTL.ST will certainly help you make a decision on the purchase.
If you already are a holder of Cobra Electronics 148.GTL.ST, 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 Electronics 148.GTL.ST.
However, one of the most important roles played by the user manual is to help in solving problems with Cobra Electronics 148.GTL.ST. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Cobra Electronics 148.GTL.ST 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
