Question about Cobra 29 LTD CB Radio

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Cobra 29 hi i cannot change or switch the stations. help.

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Do you mean you can't change channels? If this is so, you may have the PA switch on. I Hope this helped, but your question is a bit vague. More details are needed. Good Luck
Ed
NC Electronic
Mills, Wyoming

Posted on Jan 07, 2008

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1 Answer

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1 Answer

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Hi,

To my knowledge and depending on what board your Cobra 29GTL used, R46 is 47ohms dropping resistor after the switched 12V. Its output is then filtered by C20, 100uF/16V. While it is true that a shorted C20 would burnout R46, the issue is most likely a shorted FET2 (P/N 2SK104H). Should FET2 proved to be shorted, then it is very possible also that inductor/coil near FET2 is defective (LT-A108?).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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Hi,

To my knowledge on a Cobra 29 board, replacing TR14 (2SC2029) with a 2SC1969 is supposed to improve/increase the TX power output. Additionally however, L12, 13 & 14 must also be adjusted while the 29 is hooked up to a dummy load/watt meter. Should you wish to try for experimental purposes only:
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Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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1 Answer

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