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Attempting to repair HP5044A Oscillator

Discussion in 'Electronic Repair' started by Jim Flanagan, Mar 10, 2007.

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  1. Jim Flanagan

    Jim Flanagan Guest

    Does anyone have any troubleshooting documentation
    for this precision 10MHz osc? My unit appears to be
    AM modulating around 30 KHz. If anyone has the
    service manual for this I could sure use some
  2. DaveM

    DaveM Guest

    Assuming that the model number in the subject line is a typo, and should really
    be 10554A, there is a bit of info available. This oscillator and its successor,
    the 10811 were the mainstay of the HP Z3801A GPS frequency standard that was
    used by many cell phone systems. Take a stroll through the K8CU web site at He has a great page on
    the 10811, including a tutorial on getting into the main oven, where all the
    good stuff lives. The 10811 is the same as the 10554 in most respects.

    You can download the schematic for the 10544A at

    Download a copy of the 10811 manual from

    Dave M
    MasonDG44 at comcast dot net (Just substitute the appropriate characters in the

    Life is like a roll of toilet paper; the closer to the end, the faster it goes.
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