Question about Cobra 29 LTD CB Radio

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Cobra 29 no sound but it picks up

The cb will pick up but I can hear no one at all. It all lights up and everything. I mess with the squelch but still didnt get any sound out of it. CAn u please help me thank u

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  • stuartvideo Oct 26, 2008

    low almost no sound but pick up.
    please help!



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In my case with the same problem i found a broken blue wire on the mike's connector.

Posted on Jan 06, 2009

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Hello Gentlemen,

It sounds like a problem with the audio output stage of the CB, to test this:

1) get a schematic of the CB
2) unplug and un-install the CB
3) put it onto a workbench, remove the cover, and use a 12volt DC power supply to power it
4) on the schematic find the point where the IF signal goes into the Quadrature Detector and test its level against the schematics level using an if probe and a voltmeter.
5) find the point where the Quadrature detector turns the IF into audio and then using an audio test amplifier see if audio is present at the output of the Quadrature detector.
6) If audio is present then trace the signal through the audio stages, until you find the stage where it drops out
7) if audio is not present, then the problem is the Quadrature detector.
8) In either case troubleshoot and find the bad components and replace them.
9) I would suspect bad capacitors, or a malfunctioning audio output IC.

I hope this helps

Shuttle83

Posted on Nov 01, 2008

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