Question about Cobra 18 WX ST 40-Channels Base CB Radio

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Cobra 18wx st II, not working...

I recently bought a Cobra from a friend to use for work. When he pulled it out of his pickup it was working. When I installed it in my company semi that I drive daily it will not work. I can get sound out of the speaker for the weather channels, but when I try to broadcast I get nothing. The power meter will go up when you cue up the mic but I get no response. Would it be the antenna thats mounted on the truck is bad or what??? Please help.

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  • busman2 Sep 22, 2008

    I have a cobra 18wxst11. I can hear everydody clear but when I send they tell me my mike sreeches.

  • cruiser guy Sep 27, 2008

    Hello, mine is doing the same problem.  Fine reception, on transmission only annoying "buzz" over the recipient's speaker.  My friend thinks its my mic.  What do you guys think?

  • yxlasse Mar 01, 2009

    Cobra 18wx st II, not working sending ok but reciving nothing
    only when WX option is on u can hear sound from speaker
    what to do?



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I would agree that it can be the mic if the radio seems to be going into transmit. If it was a antenna problem you would still hear people talking on ch 19 and you would still talk but your distance would be greatly cut back. These radio's have a very common issue with vibration causing the solder in the radio to crack more commonly called a cold solder joint. I have repaired many of these myself over the years. You will need to have a tech look at it maybe a good cbshop. Hope this helps

Posted on Jun 26, 2009

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Yes it is the twig, it is either the wire is broken on the plug center pin. the magmount centre pin or a bad earth on the mount. ask a friend with a rig to copy you close up. you should rx and tx. if it is your twig dont hold the key down long or you will take out the output can soon see if you have by keying the rig and the needle does not move.

Posted on May 28, 2009

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For the 1st and last one I'd have to say to check the antenna system and coax out real well first. For cruiser guy there's a good chance that it is a mic problem or a broken mic wire. Let me know,,, Mechanic

Posted on Nov 05, 2008

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