[time-nuts] Thermal impact on OCXO

Lars Walenius lars.walenius at hotmail.com
Wed Nov 23 15:55:03 EST 2016

Hi Bob,

I was afraid that the answer should be like this (smile).

One paper from MTI that probably confirms that aging prediction is difficult:



From: Bob Camp<mailto:kb8tq at n1k.org>
Sent: den 19 november 2016 00:23

> On Nov 18, 2016, at 1:31 PM, Lars Walenius <lars.walenius at hotmail.com> wrote:
> Hi Bob (and all others),
> I agree to all your points but am curious to your comment: ”that OCXO is aging a lot for one that has been on that long”.
> As I have only done this test and seen no other test of OCXO´s powered over at least ten years, I have no idea what is reasonable. I also guess I will not do another test of an OCXO powered and measured over ten years again.
> Could you give some examples what is reasonable for aging after ten years? Maybe others have data? I have searched internet and it isn´t easy to find long-term data on OCXO’s (at least for me).

The only people I know of that have the gear and the interest to run a number of OCXO’s are oscillator manufacturers. They also track parts
in the field by various methods. The data takes real effort to collect and thus is “part of our IP”.


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