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Manual Cobra Electronics 148.GTL.ST

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  • Cobra Electronics 148.GTL.ST - page 1

    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.GTL.ST.MANUAL 10/1/98 10:56 AM Page 1 ...

  • Cobra Electronics 148.GTL.ST - page 2

    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...................................................................... 2 Section II: Specifications ................................................ ...

  • Cobra Electronics 148.GTL.ST - page 3

    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. This unit features ad vanced Phase Lock Loop (PLL) circuitry, which is used in the AM mode and in the upper and lower single sideband modes ...

  • Cobra Electronics 148.GTL.ST - page 4

    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 @ 1.1 KHz, 60 dB @ 2.3 KHz. Image Rejection More than 65 dB . IF Frequency AM: 7.8 MHz 1st IF ...

  • Cobra Electronics 148.GTL.ST - page 5

    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. Under most operating conditions, w hen signal level is adequate, the backgr ...

  • Cobra Electronics 148.GTL.ST - page 6

    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.). NOTE T he COBRA 148 GTL ST will ...

  • Cobra Electronics 148.GTL.ST - page 7

    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 . The Built-in SWR (standing w a v e ratio) meter lets you easily measure your antenna co ...

  • Cobra Electronics 148.GTL.ST - page 8

    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 . U s ed t o p r op e r l y ad ...

  • Cobra Electronics 148.GTL.ST - page 9

    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. When listening to an AM transmission, a correct sideband i ...

  • Cobra Electronics 148.GTL.ST - page 10

    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 . 3. Loosen the two cable clamp retainer screws. 4. F eed the microphone cable t ...

  • Cobra Electronics 148.GTL.ST - page 11

    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. Do not substitute. Refer to the ...

  • Cobra Electronics 148.GTL.ST - page 12

    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. 3. T urn the volume up louder than your nor- mal listening level. 4. Switch the ...

  • Cobra Electronics 148.GTL.ST - page 13

    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. 2. Y ou are not allowed to blast others off the air by o ver-powering them with illegall ...

  • Cobra Electronics 148.GTL.ST - page 14

    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 . 1 . Fo r W a r r anty R epair , include s ome form of pr o o f - o f - p u r ...

  • Cobra Electronics 148.GTL.ST - page 15

    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 $39.95 ECHO POWER MICROPHONE or 148 GTL ST CA-79 $69.95 High Performance, Magnetic Moun ...

Manufacturer Cobra Electronics Category Two-Way Radio

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All of them are important, but the most important information from the point of view of use of the device are in the user manual Cobra Electronics 148.GTL.ST.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Cobra Electronics 148.GTL.ST, service manual, brief instructions and user manuals Cobra Electronics 148.GTL.ST. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Cobra Electronics 148.GTL.ST.

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A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Cobra Electronics 148.GTL.ST by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Cobra Electronics 148.GTL.ST.

A complete Cobra Electronics manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

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