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Thread: Strange power level change!

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  1. #1
    Join Date
    May 2002
    Location
    Crest, Ca (just East of El Cajon)
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    29,415

    Default Strange power level change!

    When I tune up my Drake L7, I see the power slowly increase, almost like a capacitive action. I see it on the scope too. When I key down with a carrier, it will start at a low value and then rise to the correct output.

    What could cause that?
    I love my cats!
    PHOEBE and PENELOPE MEW!

  2. #2
    Join Date
    Aug 2008
    Location
    SanDiego, People's Republic of California FEMA District 9
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    Default

    Quote Originally Posted by WA6MHZ View Post
    When I tune up my Drake L7, I see the power slowly increase, almost like a capacitive action. I see it on the scope too. When I key down with a carrier, it will start at a low value and then rise to the correct output.

    What could cause that?
    Does it do it on all bands???

    What's going on with the plate current / voltage and the Grid current?
    Input VSWR; does it change??
    When it's time, and it may be sooner than you think.

  3. #3
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    May 2002
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    Crest, Ca (just East of El Cajon)
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    Default

    Plate meter doesn't work. Does it on all bands
    I love my cats!
    PHOEBE and PENELOPE MEW!

  4. #4
    Join Date
    Aug 2008
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    Default

    Quote Originally Posted by WA6MHZ View Post
    Plate meter doesn't work. Does it on all bands
    What about your input VSWR?
    Does it change as the amplifier is coming up to power?

    The most obvious thing I would look at right off would be the antenna relay.
    When it's time, and it may be sooner than you think.

  5. #5
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    Default

    Let us know what you find Pat.
    When it's time, and it may be sooner than you think.

  6. #6
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    Default

    I notice it doesn't seem to happen on a Dummy load!
    I love my cats!
    PHOEBE and PENELOPE MEW!

  7. #7
    Join Date
    May 2001
    Location
    Roswell, NM DM73
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    2,704

    Default

    Well, that's telltale isn't it? What is the antenna?
    Alan Applegate, KBG
    http://www.k0bg.com

  8. #8
    Join Date
    Aug 2008
    Location
    SanDiego, People's Republic of California FEMA District 9
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    Default

    Quote Originally Posted by WA6MHZ View Post
    I notice it doesn't seem to happen on a Dummy load!
    Now the problem is simple to find.
    At least isn't in the amplifier.
    When it's time, and it may be sooner than you think.

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