Question about Cobra Radio Communications

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Problem with Cobra CB23 transceiver. In weather channel mode, everything works perfectly. But in CB mode, no audio heard on any CB channel just a whining hum (this is indoors with a clean DC power supply). In CB mode, squelch works all right, but volume control has little effect on the whine. Connecting or disconnecting a good antenna has no effect in CB mode. In transmit mode, red transmit light comes on but no RF is generated. Inside the unit, everything is screwed down tightly, no cold solder joints are apparent, no burnt-looking components, no odor of burnt electronics. "Rocking" the band switch into and out of CB mode does not change the problem. Since problem affects CB reception and transmission, my guess is there is a common path between these modes that has a problem. I am obtaining a copy of the schematic and will troubleshoot with my oscilloscope but wonder whether this problem has been experienced before.

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  • Mike107 Sep 16, 2010

    John, there is no PA on this model Cobra. My guess is that an electrolytic capacitor has dried out in the CB portion of the transceiver, and is producing oscillation when in CB mode. I still have not gotten around to connecting my oscilloscope to the transceiver to see what might be happening. thank you, Mike

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Hi, my name is John. Try putting the unit on PA and PA speaker plugged in the back, try another cobra mic on it, if that does not do it, then we will look at the audio chip. Let me know how it goes, I will post the tools needed and procedure here. Hope this was very helpful....Rate this solution on the four thumbs-up....... John

Posted on Sep 12, 2010

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Ed
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