[time-nuts] Mechanical 1PPS Oscillator Disciplining

Brooke Clarke brooke at pacific.net
Sat Jan 10 17:35:04 EST 2015


Hi:

You can see the 4 nodes on the Chinese Spouting bowl in my video at:
https://www.youtube.com/watch?v=k68w3OrPztE

When I got it from Cliff Stoll he had recommended using a wet towel to keep the bowl from moving but that damped the 
vibrations.
I got 4 stick-on feet and placed them at the nodes seen in the video above and it works great.
If the bowl is supported anywhere but the nodes the oscillations are damped, just like for a crystal.
http://www.ted.com/talks/clifford_stoll_on_everything
https://en.wikipedia.org/wiki/Clifford_Stoll
http://www.kleinbottle.com/ <- it looks like he no longer carries the spouting bowl.

Mail_Attachment --
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Bob Camp wrote:
> Hi
>
> The mounting points are the standard locations for a flexure bar running the resonance along it’s length. The sandwich blank is a bit unique.
>
> The normal gate feedback style circuits will get the crystal running. The impedance will be quite high, so you will need a bit of gain. At low frequencies, a CMOS input op-amp will do the trick.
>
> Bob
>
>> On Jan 10, 2015, at 12:24 PM, David J Taylor <david-taylor at blueyonder.co.uk> wrote:
>>
>> Hi David yes I think I have seen similar but not as low as that. If you
>> compare the suspension points the different vibrational mode should
>> obvious.....the suspension point is at a node. I think some of these are
>> quite difficult to excite, I have not seen any suggested circuits but I have
>> not looked too hard.
>>
>> Alan
>> ====================================
>>
>> I uploaded a couple of pictures taken with the 'phone.
>>
>> http://www.satsignal.eu/Radio/2015-01-10-1700-54-crop.jpg
>> http://www.satsignal.eu/Radio/2015-01-10-1702-51-crop.jpg
>>
>> The first photo shows the size and mounting points of the crystal.  The crystal itself appears to be a two-layer structure.  The second photo shows a detail of one of the mounting points.  The gold plating appears to have been scraped away at the edge, and some sort of solder join made at the edge.  I might be able to do a better image with a different camera, but I don't know.
>>
>> Hope that is of some interest.
>>
>> David
>> -- 
>> SatSignal Software - Quality software written to your requirements
>> Web: http://www.satsignal.eu
>> Email: david-taylor at blueyonder.co.uk
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