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142 gtl vco alignment

Discussion in 'General Ham Radio Discussion' started by kaos513, Apr 7, 2018.

  1. kaos513

    kaos513 Well-Known Member

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    When i try to adjust the vco L13 will not align my meter doesnt detect the voltage any ideas? thanks


     

  2. Robb

    Robb Yup

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    Does the radio work?
     
  3. kaos513

    kaos513 Well-Known Member

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    yeah everything works great just strange doesnt read vdc on my multimeter.
     
    #3 kaos513, Apr 7, 2018
    Last edited: Apr 7, 2018
  4. Robb

    Robb Yup

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    What I find strange in all of this time on this forum is that you've worked on - what; some four different radios? And you still don't know how to measure neither voltage nor mA?!? Passes all sense of reasoning.
    Can you explain yourself; please?
     
    711 likes this.
  5. kaos513

    kaos513 Well-Known Member

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    i followed alignment procedure from radio mods
     
  6. kaos513

    kaos513 Well-Known Member

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    not every step i followed from radio mods 142gtl alignment procedure works.
     
  7. Robb

    Robb Yup

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    If you can measure the voltage from a 9v battery; then you can measure the VCO voltage. If you can't do that; then forget about doing any radio alignments.

    The black lead of your meter goes to board ground, and the red wire goes to the bare lead of a resistor that is just in front of the VCO chip. Can't miss it; it is the only upright resistor there w/o any paint on its upper lead.

    Just to be clear, the VCO chip is that long, brown, standing chip behind the PLL chip that says 'UNIDEN' on it. It is also right in front of L19. Can't miss it.

    It isn't any more difficult than that.
    Adjust for 3.5v on ch40/AM.
    Do NOT exceed 3.5v.
    Done.
     
    #7 Robb, Apr 7, 2018
    Last edited: Apr 8, 2018
  8. jon666

    jon666 Sr. Member

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    good job robb
     

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