Hi
One interesting thing to look at on modern OCXO’s:
Part of the factory alignment *probably* was intended to set the unit
at the center of the EFC range. Back in the days of people selecting caps
or selecting resistors, that could be a pretty coarse kind of thing. At some
point computers got
I put a UCT8663 DOCXO in my HP-53132A counter (using Gerry Sweeny's adapter
board). I bought a bunch of those DOCXOs around 10 years ago. It was never
powered up during that time. Here are the notes that I made:
UTC 8663 mounted on Sweeny DOCXO card in a HP 53132A counter. The 8663 had
Hi,
For better oscillators I let them sit for at least a week, but
preferably a month, before making any judgements on them. The readings
taken is really just their warm-up behavior. Wider phase-noise can be
measured earlier, but very close-in and ADEV/MDEV stabillty, not so much.
Hadamard
Ulf wrote:
the oscillators exhibit a monotonus EFC voltage drift towards 0 volts. About +
1 mV in 3 minutes.
* * *
Test time has been 3 Days, and I beleive thata 10811 should have been able to
reach thermal equilibrium during this time.
There is much more than thermal equilibrium
Hi
One of the weak points of a normal 10811 is that it is not hermetically sealed.
Left
in storage for years, they “soak up” humidity. In some cases it can take a
fairly long
time (weeks, months) for them to fully dry out. Until they have been run for at
least a
week, don’t get excited about
Gentlemen.
I am about to try to repair a second 5065Aand have now tested a number of 10811
Quartzoscillators that was in the junk box.
In order to test the 10811, I put them it in a chassisthat is used for
GPS-locking. Adjust for lockand then monitor the EFC-voltage over time.
Starting out
