Question about Cobra 148 GTL 120-Channels Base CB Radio

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A problem in the squelch and volume control knob.

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  • 1205 Jun 22, 2008

    148gtl dx low vol from squelch no steps taken at moment except ive got a service manual

  • Dean Dishman May 11, 2010

    what problem are you having ? need more info

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  • Contributor
  • 27 Answers

What problem ?

Posted on Jun 22, 2008

  • flyingfox Jun 23, 2008

    Low speaker output in the cobra 148gtl is very common and was a problem when the sets when they were not as old as they are now. I think it is pension time for the old 148gtl...As a matter of interest almost all of the parts on the board are freely available with the exception of the onboard IC's>>>>TO 1205<<<< an emailed copy of the circuit diagram would be great if possiable.

    flyingfox@people.net.au

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How can i stop the squelch ive tryed turning the sqcuelch doesnt help


Plug the AC adapter into the back of the scanner and into a wall electrical outlet. Screw the antenna into the receptacle on the back of the scanner (extend the antenna to full length for best reception).

  • 2 Set the squelch level to allow signals to be heard by turning the squelch knob counterclockwise. Rotate the volume knob clockwise until you hear static. Slowly turn the squelch knob clockwise until the static noise disappears.
  • 3 Start programming frequencies into the scanner by pressing the "Manual" button.
  • 4 Press the up arrow or down arrow key until the channel you wish to program is visible on the display.
  • 5 Use the numbers on the keypad to enter the frequency for the local transmitter you wish to receive.
  • 6 Press the "E" key to complete the process of entering the frequency.
  • 7 Repeat steps 3 through 6 for each additional frequency you wish to monitor.
  • 8 Press the "Scan" key to start the scanning process. The scanner stops on a channel when it detects a signal strong enough to hear over the squelch setting. Two seconds after the signal stops, the scanning process resumes.
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    Begin with
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    • Check coax and antenna connections.
    • Make sure your antenna gommet/insulator is installed correctly or it will directed gound. Treat antenna shaft as it is the positive portion of circuit.
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    The black wires are both ground connected into the same part in the board. Just connect them depending on length.

    This is the picture of the vol knob, with the dial upward looking down on the tabs. The top wires, yellow and black, are for the volume. The Middle row, green, white and black are for the squelch. the orange and the red are the power switch.

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