[time-nuts] Vibration isolation of quartz oscillators

[Tom Knox]

Hi Michael;
I know Craig Nelson, Archita Hati, and Dave Howe were doing some related research at NIST. I did a quick search and think this may be the paper, but there may be others.
As I remember cable vibration can be a greater uncertainty then the oscillator.
https://www.intechopen.com/books/aerial_vehicles/vibration-induced_pm_noise_in_oscillators_and_its_suppression
[https://cdn.intechopen.com/books/images_new/3696.jpg]<https://www.intechopen.com/books/aerial_vehicles/vibration-induced_pm_noise_in_oscillators_and_its_suppression>
Vibration-Induced PM Noise in Oscillators and Its Suppression | IntechOpen<https://www.intechopen.com/books/aerial_vehicles/vibration-induced_pm_noise_in_oscillators_and_its_suppression>
Archita Hati, Craig Nelson and David Howe (January 1st 2009). Vibration-Induced PM Noise in Oscillators and Its Suppression, Aerial Vehicles, Thanh Mung Lam, IntechOpen, DOI: 10.5772/6476. Available from:
www.intechopen.com
Cheers;

Tom Knox

SR Test and Measurement Engineer

Ascent Concepts and Technology

4475 Whitney Place

Boulder Colorado 80305

303-554-0307

actast at hotmail.com

"Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein

________________________________
From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of Tom Van Baak <tvb at LeapSecond.com>
Sent: Saturday, June 27, 2020 12:56 PM
To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
Subject: Re: [time-nuts] Vibration isolation of quartz oscillators

Michael,

These are really good oscillators so in addition to guessing what sounds
like a good solution verify with actual vibration / acceleration
experiments.

Last year I tested some Oscilloquartz BVA's for axis sensitivity to
acceleration. It's quite easy. Some plots here:

http://leapsecond.com/pages/bva-rotate/

At the end of that page are two videos showing the Arduino-driven
stepper motor rotating platform that I used. If anyone can't view the
videos let me know off-list (my email is tvb at leapsecond.com).

If you end up doing something similar I would very much like to see how
your results compare.

Thanks,
/tvb


On 6/27/2020 5:02 AM, Michael Wouters wrote:
> I have three Oscilloquartz 8607-Bs that I'm rehousing.
>
> In their former life they were part of the frequency synthesis chains
> for H-masers and they hung vertically from a rubber suspension that was
> presumably intended to provide vibration isolation. Unfortunately, the
> person responsible for this has long since retired so is no longer
> around to ask questions of.
>
> In the experiment I will be averaging over  100 s, which suggests to
> me that very low frequencies are what I need to filter out (if at
> all), and I am skeptical that the rubber will do this. Space is tight
> so I am wondering
> whether I should simply ditch the isolation.
>
> What do other people do with their quartzes ? I thought I should ask
> for some advice before attempting measurements.
>
> Cheers
> Michael
>
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