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(CB A citizens band and Class C remote control frequencies.) FCC regulations permit only “(one party to another) than “broadcasts” (to a wide audience). Thus, advertising is not allowed on CB Channels because that is “broadcasting. ” NOTICE: Replacement or substitution of transistors, regular diodes or other parts of a unique nature, with parts other than those recommended by Cobra, may cause violation of the technical regulations of Part 95 of the FCC Rules, or violation of Type Acceptance requirements of Part 2 of the Rules. Citizens Band (CB) Radio operators are no longer required to obtain an FCC license to operate their CB equipment or provide station identification. An operator of a CB radio station is required to comply with the communications act and with the rules of CB Radio Operation. Serial No. Date of Purchase Dealer Name Keep this manual for detailed information about your Cobra CB radio. SAVE YOUR SALES RECEIPT, THE CARTON AND “PACKING” MATERIALS FOR POSSIBLE FUTURE USE. 1 FREQUENCY RANGE The COBRA 148GTL transceiver represents one of the SSB/AM two- way radios ever designed for use as a 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. Channel Channel Frequency Channel Channel Frequency in MHz in MHz 1 26.965 21 27.215 2 26.975 22 27.225 3 26.985 23 27.255 4 27.005 24 27.235 5 27.015 25 27.245 6 27.025 26 27.265 7 27.035 27 27.275 8 27.005 28 27.285 9 27.065 29 27.295 10 27.075 30 27.305 11 27.085 31 27.315 12 27.105 32 27.325 13 27.115 33 27.335 14 27.125 34 27.345 15 27.135 35 27.355 16 27.155 36 27.365 17 27.165 37 27.375 18 27.175 38 27.385 19 27.185 39 27.395 20 27.205 40 27.405 The COBRA 148GTL has a vastly superior receiver which includes an RF gain control and noise blanker circuitry effective in both AM and SSB modes., and an automatic noise limiter effective in the AM mode. The receiver also features increased protection against cross modulation and strong adjacent channel signals. To obtain maximum performance please read carefully the descriptions and operating instructions in this manual. 2 Section Section 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. Input Voltage 13.8V DC nominal, 15.9V max., 11.7V min. (positive or negative ground). Current Drain Transmit: AM full mod., 2.2A. SSB 12 watts PEP output, 2A. Receive: Squelched, 0.25A Maximum audio output, 0.6A. Size 2 3/ 8”(H) x 7 7/ 8”(W) x 9 1/ 4”(D). Weight 5 lbs. Antenna Conductor UHF, S0239. Semiconductors 3 field effect transistors, 45 transistors, 63 diodes, 6 integrated circuits, 1 two color light emitting diode. Meter (3-in-1) Illuminated; indicates relative output power, received signal strength, and SWR. TRANSMITTER Power Output AM, 4 watts. SSB, 12 watts, PEP. Modulation High-and low-level Class B, Amplitude Modulation. Intermodulation Distortion SSB: 3rd order, more than -25 dB. 5th order, more than -35 dB. SSB Carrier Suppression 55 dB. Unwanted Sideband 50 dB. Frequency Response AM and SSB; 300 to 2500 Hz. Output Impedance 50 ohms, unbalanced Output Indicators Meter shows relative RF output power and SWR. Transmit LED glows red when transmitter is in operation. 3 RECEIVER Sensitivity SSB: 0.25 .V for 10dB (S+N)/N at greater than 1/2-watt of audio output. AM: 0.5 .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, 455 KHz 2nd IF. SSB: 7.8 MHz. Adjacent-Channel Rejection 60 dB AM & 70 dB SSB. AM and SSB RF Gain Control 40 dB adjustable for optimum signal reception. Automatic Gain Control (AGC) Less than 10 dB change in audio output for inputs from 10 to 100,000 microvolts. Squelch Adjustable; threshold less than 0.25 .V. ANL Switchable. Noise Blanker RF type, effective on AM and SSB. Voice Lock Range ± 2.5 KHz. Audio Output Power 4 watts into 8 ohms. Frequency Response 300 to 2500 Hz. Built-in Speaker 4 ohms, round. External Speaker (Not Supplied) 8 ohms; disables internal speaker when connected. PA SYSTEM Power Output 4 watts into external speaker. External Speaker for PA (Not Supplied) 8 ohms. (SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE) 4 Section (Continued) Section LOCATION Plan the location of the and microphone bracket before starting the Select a location for operation and does not interfere with the driver or passengers in the vehicle. In automobiles, the is usually mounted below the dash panel, with the microphone beside it. MOUNTING THE CONNECTION The COBRA 148GTL is supplied with a universal mounting bracket. When mounting the bracket and radio to y...