Cobra 148 GTL ST Operating Instructions Manual
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Cobra 148 GTL ST Operating Instructions Manual

Citizens band ssb/am 2-way mobile radio
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148.GTL.ST.MANUAL
10/1/98 10:56 AM
Page 1
OPERATING INSTRUCTIONS FOR YOUR
40 CHANNEL
CITIZENS BAND
SSB/AM 2-WAY
MOBILE RADIO
Model 148 GTL ST
Cobra Electronics Corporation
6500 W. Cortland Street
Chicago, IL 60707
PRINTED IN THAILAND
©COBRA ELECTRONICS CORPORATION 1997
480-241-P-001

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Summary of Contents for Cobra 148 GTL ST

  • Page 1 148.GTL.ST.MANUAL 10/1/98 10:56 AM Page 1 OPERATING INSTRUCTIONS FOR YOUR 40 CHANNEL CITIZENS BAND SSB/AM 2-WAY MOBILE RADIO Model 148 GTL ST Cobra Electronics Corporation 6500 W. Cortland Street Chicago, IL 60707 PRINTED IN THAILAND ©COBRA ELECTRONICS CORPORATION 1997 480-241-P-001...

  • Page 2: Table Of Contents

    Section IV: Operation..............9 - 17 and static commonly referred to as noise. This allows Cobra ’s S o u n d Tra ck e r system to significantly reduce the amount of static on all incoming CB signals. The system can Controls and Indicators ..............9...

  • Page 3: Section I Introduction

    27.205 27.405 Modulation High-and low-level Class B, Amplitude The COBRA 148 GTL ST has a vastly superior receiver which includes an RF gain Modulation. control and noise blanker circuitry effective in both AM and SSB modes., and an Intermodulation Distortion SSB: 3rd order, more than -25 dB.

  • Page 4: Section Iii Installation

    1. After you have determined the most convenient location in your vehicle, hold AM and SSB RF Gain Control 40 dB adjustable for optimum signal the COBRA 148 GTL ST with mounting bracket in the exact location desired. If reception. nothing will interfere with mounting it in the desired position, remove the...
  • Page 5 A. Antennas with adjustable screws (set screws). Even though the COBRA 148 GTL ST has ANL and NB controls, in some installa- tions ignition interference may be high enough to make good communications 1.

  • Page 6: Section Iv Operation

    (metal telephone or light posts, fences, etc.). NOTE 19 20 The COBRA 148 GTL ST will operate into an SWR of 2 to 1 indefinitely and sustain an SWR of 20:1 for a maximum of 5 minutes at rated operating conditions.
  • Page 7 COBRA 148 GTL ST. With the PA speaker con- the SWR position and read the SWR indicated. The lower the figure, the bet- nected as outlined previously, be sure that there is physical separa t i o n ter, with 1 being ideal.

  • Page 8: B.indicator Functions

    USB position. Set PA-CB Switch to the CB position and turn unit on by turning VOL control clockwise on COBRA 148 GTL ST. If a lower sideband (LSB) signal is heard when the receiver is in the USB mode, no amount of tuning will make the signal intelligible.

  • Page 9: Alternate Microphones And Installation

    VOICE LOCK control. For simplicity it is rec- ommended that the AM modes be used to listen to AM signals. Fig. 1. Cobra 148 GTL ST microphone schematic. If the microphone to be used is provided with pre-cut leads, they must be revised as follows.
  • Page 10 148.GTL.ST.MANUAL 10/1/98 10:56 AM Page 19 Section IV Operation (Continued) Section IV Operation (Continued) Fig. 2. Microphone Cable Preparation To wire the microphone cable to the plug provided, proceed as follows. Fig. 4. Microphone plug pin numbers viewed from rear of pin receptacle. Be sure that the housing and the knurled ring of Fig.

  • Page 11: Section V Maintenance And Adjustment

    SOUNDTRACKER SYSTEM While previous systems only “blanked out” or limited noise in higher sound fre- The COBRA 148 GTL ST transceiver is specifically designed for the environment quencies, the revolutionary new SoundTracker System actually reduces noise encountered in mobile installations. The use of all solid state circuitry and its light while leaving the signal intact in the reception mode.

  • Page 12: Activating/Testing Soundtracker

    148.GTL.ST.MANUAL 10/1/98 10:56 AM Page 23 Activating/Testing SoundTracker Section VI Appendix Citizens Band radio operators have largely adopted the “10-code” for standard questions and answers. Its use permits faster communications and better under- ACTIVATING SOUNDTRACKER standing in noisy areas. The following table lists some of the more common codes and their meanings.

  • Page 13: A Few Rules That Should Be Obeyed

    148.GTL.ST.MANUAL 10/1/98 10:56 AM Page 25 Section VI Appendix (Continued) Section VI Appendix (Continued) A FEW RULES THAT SHOULD BE OBEYED USE CHANNEL 9 FOR EMERGENCY MESSAGES ONLY You are not allowed to carry on a conversation with another station for more FCC gives the following examples of permitted and prohibited types of communi- than five minutes at a time without taking a one-minute break, to give others cations for use on Channel 9.

  • Page 14: Limited Two Year Warranty

    You may be asked to send your unit to the Cobra factory. It will be necessary to for period of two (2) years from the date of first consumer purchase. This warranty furnish the following, in order to have the product serviced and re t u r n e d .

  • Page 15: Cobra Cb Radio Accessories

    Minnesota residents add 6% Ohio residents add 6% Wisconsin residents add 5% If you wish, you can order directly from Cobra Order by phone: Call 1-773-889-3087 (Press 1 from the main menu) 8a.m.-8p.m. M-F CST. Order by mail or fax: Please fill out order form below, and mail/fax directly to Cobra.

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