Question about Cobra 29 LTD CB Radio

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I have just bought a cobra 29 ltd classic with a scanner ant and it worked befor on the turck it was on but now that iv installed it on my truck im not able to talk to other nor hear them

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Sounds like a mic problem if a wire is broken in the mic it will not let you receive or transmit common..or not to common an audio chip...

Posted on Aug 19, 2008

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Your SWR is probably NOT fine. You need to use an external meter if you have had work done to the radio. Especially if you have had a swing mod done to the radio. When you do this, the dead key of the radio is lower then the calibration knob on the radio can adjust for. It will always come up lower then it actually is.

Your radio might have been fine before the work was done on it because it was putting out very little power. Now you are most likely putting out 50 watts or more. Big jump from 4 watts.

When your raise the power in a radio, you will notice more when the antenna is not properly tuned.

In most cases with a stock CB, even when the antenna is not even near tuned, you will get a reading less then 1.5 anyway.

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But an external SWR meter, and check it. be careful if the ANT light is on.

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ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab

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As I understand from a tech friend of mine, most truck beds are not grounded well enough. Perhaps you could borrow/purchase a magnet mount antenna and locate it on the roof, for testing. Then you would have it narrowed down to the location.

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Check D23 and D28. They are polarity protection diodes. It could also be the power knob.

Nov 09, 2008 | Cobra 29 LTD CB Radio

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