[time-nuts] Cheap Rubidiums

[Bob Camp]

Hi

The issue is not the size of the pile of OCXO's, it's the amount of time available to spend doing the sorting.

I'm not a big fan of doing the C field correction stuff. A lot of the temperature effects have second order stuff that can be pretty hard to tame. If the temperature is just plain stable, you don't have to worry about therm ...

Bob


On Dec 23, 2009, at 3:30 PM, Corby Dawson wrote:

> Bob,
> 
> Sounds like a good thing to try.
> 
> It just depends how many DOXCOs you have to go thru to find one that
> gives you a decent short term stability in the 1 to 100 second range.
> 
> I have found that even if the published spec is 1X10-12th at 1 thru 100
> seconds actually finding units that perform that well is problematic!
> 
> The venerable HP 10811 series usually exceeds its spec. by a good amount!
> 
> 
> I use a "cherry picked" 10811-60111 that runs at 5X10-13th from 1 to 100
> seconds!
> 
> Had to test a whole pile to find such a overachiever!
> 
> See my post jan 2009 "More quartz short term stabilities"
> 
> You might also consider using temperature measuring system tied to the
> baseplate and drive the C-field to cancel frequency changes due to
> temperature.
> 
> Could be simpler than designing and operating some sort of oven system.
> 
> Corby
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