[time-nuts] Phase noise vs warmup or time
lists at cq.nu
Tue Dec 29 22:57:37 UTC 2009
It depends a lot on who made the crystals, how long they have been on the shelf, and how accurate your sort needs to be.
If the crystals are from an unknown source or have been sitting for years, some burn in (days) may be helpful.
I would suggest sorting out the dogs pretty quickly and then run the best of the bunch for a coupe of hours to see what happens.
On Dec 29, 2009, at 3:43 PM, Hal Murray wrote:
> dk4xp at arcor.de said:
>> What we already have seen is that crystals from the same production
>> run may yield up to 15 or 20 dB worse phase noise at 100 Hz than the
>> best. (in the same oscillator)
> If I have several crystals and I want to find the ones with good phase noise,
> do I have to let them run in their ovens for a week/month, or can I just turn
> them on and measure the phase noise?
> These are my opinions, not necessarily my employer's. I hate spam.
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