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Cobra Cobra 148 GTL 148 GTL 148 GTL manual

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Table of contents for the manual

  • Page 1

    How T o Use Y our 40-CHANNEL, CITIZENS B AND SSB/AM 2-W A Y MOBILE RADIO Model 148 GTL Contents P age T he CB Stor y .................................................................................... 1 Section I: Introduction ...................................................................... 2 Section II: Specifications ......................[...]

  • Page 2

    Section I Intr oduction FREQUENCY RANGE T he COBRA 148GTL transcei ver represents one of the most ad v anced SSB/AM two- wa y radios ev er designed for use as a Class D station in the Citizens Radio Service. T his unit features ad vanced Phase Loc k Loop (PLL) circuitry , which is used in the AM mode and in the upper and lower single sideband modes[...]

  • Page 3

    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 F requency AM: 7.8 MHz 1st IF , 455 KHz 2nd IF . SSB: 7.8 MHz. Ad[...]

  • Page 4

    Section III Installation (Continued) IGNITION NOISE INTERFERENCE Use of a mobile receiv er at low signal levels is normally limited b y the presence of electrical noise. The primary sour ce of noise in automobile installations is from the generator and ignition system in the vehicle. Under most oper ating conditions, when signal level is adequate, [...]

  • Page 5

    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 way from large metal objects when adjusting (metal telephone or light posts, fences, etc.). NOTE T he COBRA 148GTL will oper[...]

  • Page 6

    10 Section IV Oper ation (Continued) 4. SWR CAL CONTROL (outer dual concentric) . In order for y ou to achieve maximum radiated power and the longest r ange, it is important that your antenna be in good condition, properly adjusted and matched to y our trans- ceiver . The Built-in SWR (standing w ave r atio) meter lets you easily measure your anten[...]

  • Page 7

    Section IV Oper ation (Continued) B. INDICA TOR FUNCTIONS 1. S-METER. Swings proportionally to the strength of the incoming signal. 2. RF METER . Swings proportionally to the RF output power . 3. SWR METER . Swings proportionally to the ratio of standing w ave v oltage and RF output. Used to properly adjusts the length of the antenna, and to monito[...]

  • Page 8

    Section IV Oper ation (Continued) T hus when a voice is used in place of a w histle or tone, in the proper listening mode the voice will be recei ved correctly whereas in the incorrect mode, the voice will be translated bac kwards and cannot be made intelligible by the v oice lock control. When listening to an AM tr ansmission, a correct sideband i[...]

  • Page 9

    Section IV Oper ation (Continued) Fig. 2. Microphone Cable Preparation T o wire the microphone cable to the plug provided, proceed as follo ws. Fig. 3 . Microphone plug wiring. 1. Remove the retaining screw . 2. Unscrew the housing from the pin receptacle body . 3. Loosen the two cable clamp retainer screws. 4. F eed the microphone cable through th[...]

  • Page 10

    18 Section V Maintenance and Adjustment T he COBRA 148GTL transceiver is specifically designed for the en vironment en- countered in mobile installations. The use of all solid state cir cuitry 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[...]

  • Page 11

    Section VI Appendix (Continued) A FEW RULES THA T SHOULD BE OBEYED 1. Y ou are not allowed to carry on a conversation with another station for more than five minutes at a time without taking a one-minute break, to gi ve others a chance to use the c hannel. 2. Y ou are not allowed to blast others off the air by ov er -powering them with illegally am[...]

  • Page 12

    If Y ou Need Service If Y ou T hink Y ou Need Service, Call 773-889-3087 Y ou ma y be asked to send your unit to the Cobr a factory . It will be necessary to furnish the following, in or der to have the pr oduct serviced and returned. 1. For W arr anty Repair , include some form of proof-of-pur chase, such as a me- c hanical repr oduction or carbon[...]

  • Page 13

    Description Part No. Cost Ea. X Qty . = Amount Replacement microphone with 4-pin connector for 148 GTL CA-73 $19.95 MOBILE POWER MICROPHONE Amplified Power Microphone with 4-pin connector for 148 GTL CA-75 $19.95 NOISE CANCEL MICROPHONE for 148 GTL CA-77 $39.95 ECHO POWER MICROPHONE or 148 GTL CA-79 $69.95 High Performance, Magnetic Mount Antenna. [...]

  • Page 14

    2 PRINTED IN THAILAND ©COBRA ELECTRONICS CORPORA TION 1996 480-163-P- 001 Cobr a Electronics Corporation 6500 W . Cortland Street Chicago, IL 60707[...]