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Cobra 2000 GTL low tx audio and no power out

Discussion in 'CB Radio Modifications' started by Kracker, Nov 23, 2018.

  1. Kracker

    Kracker Member

    Joined:
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    Ok I'll try to explain this best I can.
    when i key up, my external meter shows nothing going out, cannot even check swr because if i switch to swr the meter stays at zero. It is located on my garage workbench. so i can get in my truck and drive around the block and from my mobile radio and talk to my kid on the 2000 and 1 block away it hits my mobile with 3 to5 s units and the audio is in the toilet, volume way up just to hear my kid. so it is getting out and has a carrier but low, 2 blocks away it cant be heard.



    I swapped the pre-driver, driver, final, from a working 148 and didnt change anything. I tested the voltage regulator and PLL, and readings as follows, but not sure if i was getting a good ground, it seems i cant locate a trustworthy one in AC, so i switched to dc and i get

    driver and final 7.0 volts off center pin during tx in am, 13 in ssb
    voltage regulator and PLL readings are in the pics attached
     

    Attached Files:

    • PLL.png
      PLL.png
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    • VR.png
      VR.png
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  2. Robb

    Robb Yup

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    Does the TX indicator light up when you key the mic?
    Does it receive?
    Have audio?
    Radio been hacked before?
    PA work?
     
  3. Kracker

    Kracker Member

    Joined:
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    yes it does.
     

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