If you can measure the 10811 frequency as a function of the control
voltage with the 10811 control voltage input disconnected from
everything else, you'll have a curve that will allow you to translate
control voltage changes into frequency drift.
My impression is that the 10811 ageing is generally all in one direction.
73,
Dave
wa8ywq
On 11/5/2012 6:49 AM, Chris Howard wrote:
I built a GPSDO using my own power supply,
a VE2ZAZ board, a Trimble Resolution T GPS
and a surplus HP 10811 oscillator.
I'm having a bit of trouble with it. I have it set up and
it locks ok and stays in lock so far. But the recommended
long-term integration setting is not working for me.
I think it is about 3 hours. At the end of every cycle
it does a control voltage adjustment, always in one direction.
If I understand it right, the oscillator is slowing and needs
an incremental bump downward of control voltage every time.
That seems like it is more than just long term drift. But
I don't have my head around the quantities I'm looking at.
I can measure the control voltage change over time. Can I convert that
into a frequency drift? Or do I need to stop the voltage
adjustments and allow the drift to occur then do a measurement
of that directly somehow?
Is this type of behavior an indication of dire problems
with my 10811 oscillator?
Chris Howard
w0ep
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