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Cobra cb radio, model 75 wx st, has loud and clear weather radio transmissions but receiver is weak and has loud scratchy pops. Transmitter is unknown as no one has ever answered a call for radio check. Dealer checked antenna and said insulation was packed around base of antenna -- they cleared that but still poor reception.

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You didn't actually have a "category" for CB radio so I picked the closest thing to it but in no way does it resemble a speaker and sub woofer problem. I did not continue with the query because the CB is in an RV and not colocated with the computer and I decided there was no way for you to diagnose the problem without me knowing more about the system installation. I need to get the RV in to someone who knows CB radios.

Posted on Aug 21, 2008

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Scosche transmitter


make this test and fix it. God bless you
There is a problem with the wiring. Check the antenna circuit and rewire if necessary. There is a problem with the antenna. Check the antenna and replace if necessary. There is a problem with the radio. If you received more than one station with your previous system and you have already checked the wiring and the antenna, either replace the radio or send it to a service center.

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Just received my new cobra 29 lx cb. When I turn on the power the radio comes on for about 2 seconds then the screen goes blank and all fuctions cease. When the power to the radio is turned off, the screen...


  • Check that power cord up by the tip. It is possible it is a little loos in the tip (that hooks into the radio) Being new it almost has to be related to the power feed.
  • Make sure the fuse you are using is good. Use a 4 amp fuse in there.
  • Make sure you installed all the shoulder washers in your antenna properly or this will cause a short too.
  • Your power supply could be at fault too. Take a multimeter and turn it to DC volts and make sure 13.8 is coming out of it. The power supply could be failing under a load. Have you tried a quick setup in the car? See if sticking the power cord pos to pos and neg to neg on the car battery keeps the radio running better. You don't need to have the antenna hooked up for this just DO NOT key the mike. Just long enough to see if the radio stays on for more than 2 seconds.
  • If you do all this testing and the radio still cuts out then you have a defective unit and it needs to be replaced with a properly running unit.


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Regards, Tony

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