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Loss of Modulation when it's Hot Out?

Discussion in 'CB Radio Forum' started by gummy bear, Mar 6, 2011.

  1. Mar 6, 2011 #1
    gummy bear

    gummy bear Light Load Member

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    Nov 8, 2008
    kentucky
    0
    Seems as though whenever it gets hot inside of my truck, my radio will deadkey, but it just won't modulate. It'll start to work after I open the RF gain wide open, then I can turn the RF back down & it'll keep working. Any idea of what might be going on?

    It's a Cobra 29 LTD Classic, btw.
     
    gummy bear, Mar 6, 2011
    gummy bear, Mar 6, 2011
    #1
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  3. Mar 6, 2011 #2
    ironpony

    ironpony Road Train Member

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    Ask my GPS...
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    Don't mean to come off like a smart-a, but you've got a broken radio that needs a CB shop. The transmit side has a component that is failing - its not uncommon for a solid state transistor to fail when it gets too hot.
     
    ironpony, Mar 6, 2011
    ironpony, Mar 6, 2011
    #2
  4. Mar 6, 2011 #3
    kd5drx

    kd5drx <strong>Master of Electronic Communications</stron

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    Nov 28, 2006
    Some where USA
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    The RF gain has nothing to do with transmit so this is just a coincidence or something on the board is burnt crossing things over. But either way you need a repair shop to go inside and find for sure what is breaking down but it sounds like you have a set of finals going out.
     
    kd5drx, Mar 6, 2011
    kd5drx, Mar 6, 2011
    #3
  5. Mar 7, 2011 #4
    gummy bear

    gummy bear Light Load Member

    245
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    Nov 8, 2008
    kentucky
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    Thanks for the replies, guys. Looks like I'll take 'er by a shop when I get a chance
     
    gummy bear, Mar 7, 2011
    gummy bear, Mar 7, 2011
    #4
  7. Mar 7, 2011 #5
    WA4GCH

    WA4GCH Road Train Member

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    Aug 12, 2009
    Seminole Florida
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    Sounds like bad caps time for it to go to the shop
     
    WA4GCH, Mar 7, 2011
    WA4GCH, Mar 7, 2011
    #5
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