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Anyone have a sugestion for noise in big truck ?

Nice trucks, but lacking counterpoise and not much you can do about that so the best you can do to make sure the antenna mount has a good bond to the frame of the truck and the cab chassis to the frame and as said before try to locate the source of interference.
 
Radio is a magnum s3.By chance where is the power supplied from to the roof mounted power points?I noticed when the headliner was down that the 2 wires coming off the power points lead to a small white connector which had a tag that read cb.I could not follow any further due to all the wiring up there so much in fact that I could barely get my hands in there.

Look for a LC filter they sell them for ham radios, also make sure EVERYTHING is grounded good!
 

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  • @ heartbreaker3473:
    Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
  • @ AudioShockwav:
    Wes, it's better if you start a thread on the main forum, more people are going to see your question.
  • @ heartbreaker3473:
    Okay, sorry, will put in a forum
  • @ heartbreaker3473:
    I put it in the general disscution help area and started a new thread. Thank you for letting me know.