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

Citizens band ssb/am 2-way mobile radio
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Enlarged version
How To Use Your
OPERATING INSTRUCTIONS FOR YOUR
40-CHANNEL,
CITIZENS BAND
40 CHANNEL
SSB/AM 2-WAY MOBILE RADIO
CITIZENS BAND
Model 148 GTL
SSB/AM 2-WAY
Contents
Page
MOBILE RADIO
The CB Story ....................................................................................1
Section I: Introduction......................................................................2
Section II: Specifications ..............................................................3, 4
Section III: Installation ........................................................5, 6, 7, 8
Model 148 GTL
Section IV: Operation................................................................9 - 17
Controls and Indicators ....................................................................9
A.Control Functions ..............................................................9, 10, 11
B.Indicator Functions ......................................................................12
Operating Procedure to Receive......................................................12
Operating Procedure to Transmit ....................................................13
Receiving SSB Signals ..............................................................13, 14
Alternate Microphones and Installation ..............................15, 16, 17
Section V: Maintenance and Adjustment ..................................18 -21
FCC Warning ..................................................................................18
Section VI: Appendix ..........................................................19, 20, 21
Ten Code ........................................................................................19
A few Rules That Should Be Obeyed ..............................................20
How Your CB Can Serve You ..........................................................20
Use Channel 9 for Emergency Messages Only ................................21
Warranty Service Instructions ..........................................................22
Limited Two Year Warranty ..............................................................23
Cobra CB Radio Accessories ..................................Inside Back Cover

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Summary of Contents for Cobra 148 GTL

  • Page 1: Table Of Contents

    Ten Code ...19 A few Rules That Should Be Obeyed ...20 How Your CB Can Serve You ...20 Use Channel 9 for Emergency Messages Only ...21 Warranty Service Instructions ...22 Limited Two Year Warranty ...23 Cobra CB Radio Accessories ...Inside Back Cover...

  • Page 2: The Cb Story

    27.185 27.205 The COBRA 148GTL has a vastly superior receiver which includes an RF gain con- trol and noise blanker circuitry effective in both AM and SSB modes., and an auto- matic noise limiter effective in the AM mode. The receiver also features increased protection against cross modulation and strong adjacent channel signals.

  • Page 3: Section Ii Specifications

    Section II Specifications GENERAL Channels 40 AM, 40LSB, 40 USB. Frequency Range 26.965 to 27.405 MHz. Frequency Control Phase Lock Loop (PLL) synthesizer. Frequency Tolerance 0.005% Frequency Stability 0.001% Operating Temperature Range -30° C to + 50° C Microphone Plug-in dynamic; with push-to-talk switch and coiled cord.

  • Page 4: Section Iii Installation

    The unit requires very little current and therefore will not significantly discharge the vehicle battery. Even though the COBRA 148GTL has ANL and NB controls, in some installations ignition interference may be high enough to make good communications impossi- ble.
  • Page 5 2. Set your COBRA 148GTL to Channel 21. Press the PTT (Push-to-Talk) switch, and tap the antenna (making it shorter). The SWR meter will show a lower reading each time the antenna is tapped.

  • Page 6: Section Iv Operation

    Section IV Operation CONTROLS AND INDICATORS There are thirteen controls and three indicators on the front panel of your COBRA 148GTL. A. CONTROL FUNCTIONS 1. OFF/ON/VOLUME (inner dual concentric). Turn clockwise to apply power to the unit and to set the desired listening level. During normal CB operation, the VOLUME control is used to adjust the output level obtained either at the transceiver speaker or the external speaker, if used.

  • Page 7: B.indicator Functions

    COBRA 148GTL. With the PA speaker connected as out- lined previously, be sure that there is physical separation between the micro- phone and the speaker itself.

  • Page 8: Operating Procedure To Transmit

    Section IV Operation (Continued) OPERATING PROCEDURE TO TRANSMIT Select the desired channel of transmission. Set the DYNAMIKE control fully clockwise. If the channel is clear, depress the Push-To-Talk switch on the microphone and speak in a normal voice. RECEIVING SSB SIGNALS There are three types of signals presently used for communications in the Citizens Band: AM, USB, and LSB.

  • Page 9: Alternate Microphones And Installation

    The microphone should provide the functions shown in schematic below. 4 WIRE MIC CABLE Pin Number Fig. 1. Cobra 148GTL microphone schematic. If the microphone to be used is provided with pre-cut leads, they must be revised as follows. Cut leads so that they extend 7/16” beyond the plastic insulating jacket of the microphone cable (see Fig.

  • Page 10: Section V Maintenance And Adjustment

    Section V Maintenance and Adjustment The COBRA 148GTL transceiver is specifically designed for the environment en- countered in mobile installations. The 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.

  • Page 11: Section Vi Appendix

    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- standing in noisy areas. The following table lists some of the more common codes and their meanings. 10 CODE Code Meaning...

  • Page 12: Use Channel 9 For Emergency Messages Only

    If You Need Service If You Think You Need Service, Call 773-889-3087 You may be asked to send your unit to the Cobra factory. It will be necessary to furnish the following, in order to have the product serviced and returned.

  • Page 13: Limited Two Year Warranty

    You must pay any initial shipping charges required to ship the product for warranty service, but the return charges will be at Cobra's expense, if the product is repaired or replaced under warranty. For further details concerning procedures for obtaining service, see the “If You Think You Need Service”...
  • Page 14 Cobra Electronics Corporation 6500 W. Cortland Street Chicago, IL 60707 PRINTED IN THAILAND ©COBRA ELECTRONICS CORPORATION 1996 480-163-P-...

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