Attempting to repair HP5044A Oscillator

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

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

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