[time-nuts] HP 10811 40 Hz low.

paul swed paulswedb at gmail.com
Wed Dec 14 17:23:59 EST 2016

I have a hp z3801 that is spare parts it never worked correctly. Did some
digging and at least one major issue is the actually HP 10811 is 38 Hz low.
It needs to be within a Hz. Checked everything feeding voltage and such and
they are solid at 5.7V from the regulator. The varicap works as expected.
Signal levels out are clean and correct. Temp is about 82C also inline.
The oscillator is actually fairly simple. Do xtals just fail after many
May see if I can map a Piezo oven oscillator into the z3801 just to see
what if anything happens. Now that I know the warm oven signal drops fromm
22V to 3.8V when hot. Fake it out.
Not sure the outer oven actually matters on the z3801. But even that can
actually be hooked up to make any circuit that might want to know thats it
hot happy.

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