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Cobra 148gtl Cb Tranciever Manual

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    Page 1 How To Use Your40-CHANNEL, CITIZENS BAND SSB/AM 2-WAY MOBILE RADIOModel 148 GTLContents Page The CB Story .................................................................................... 1 Section I: Introduction ......................................................................2 Section II: Specifications ..............................................................3, 4 Section III: Installation ........................................................5, 6, 7, 8 Section IV: Operation...
    Page 2 Section I Introduction FREQUENCY RANGE The COBRA 148GTL transceiver represents one of the most advanced SSB/AM two- way radios ever designed for use as a Class D station in the Citizens Radio Service. This unit features advanced Phase Lock Loop (PLL) circuitry, which is used in the AM mode and in the upper and lower single sideband modes, providing complete cover age of all 40 channels shown below. ChannelChannel Frequency in MHz 126.965 226.975 326.985 427.005 527.015 627.025 727.035 827.005 927.065...
    Page 3 RECEIVER SensitivitySSB: 0.25 µV for 10dB (S+N)/N at greater than 1/2-watt of audio output. AM: 0.5 µV for 10 dB (S+N)/ at greater than 1/2-watt of audio output. SelectivityAM: 6dB @ 3 KHz, 50 dB @ 9 KHz. SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz. Image RejectionMore than 65 dB. IF FrequencyAM: 7.8 MHz 1st IF, 455 KHz 2nd IF. SSB: 7.8 MHz. Adjacent-Channel Rejection60 dB AM & 70 dB SSB. AM and SSB RF Gain Control40 dB adjustable for optimum signal reception. Automatic Gain Control (AGC)Less than 10 dB...
    Page 4 Section III Installation (Continued) IGNITION NOISE INTERFERENCE Use of a mobile receiver at low signal levels is normally limited by the presence of electrical noise. The primary source of noise in automobile installations is from the generator and ignition system in the vehicle. Under most operating conditions, when signal level is adequate, the background noise does not present a serious problem. Also, when extremely low level signals are being received, the transceiv- er may be operated with vehicle...
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