[time-nuts] Oscilloquartz 8601 Rebuild Question

J. Forster jfor at quikus.com
Mon Aug 1 15:38:35 UTC 2011


Maybe these guys have what you need:

http://www.popedewars.com/home.html

-John

==============


>    John & Don,
>    Thanks for your thoughts and ideas.  Limited availability of different
>    sizes and shapes of vacuum bottle is a problem, but I'll be keeping
>    your ideas in mind when I make my selection.
>    Ed
>    On 7/30/2011 6:29 PM, J. Forster wrote:
>
> [snip]
>
> That will give you a static match, not necessarily a dynamic match.
> Consider if you filled the Dewar with mercury.
>
>
> Certainly a thermos of mercury would have much different thermal
> behaviour than an oscillator, but I don't have a thermos of mercury.  I
> think what you're getting at is whether my replacement thermal system
> has similar dynamic thermal characteristics to the original.
>
> Yes. You should, IMO, try to match the heat leak and the thermal inertia
> to keep the loop dynamics the same.
>
>
> Unfortunately, there's no way for me to test that since the original is
> smashed.  Static comparison is all I can do.
>
> You can try to keep the Dewar internals as near as possible to the
> original. That and the leakage should roughly do it.
>
> Best,
>
> -John
>
> =============
>
>
>
> Of course, if you go too far in reducing the current, the oven could
> overheat.  The oscillator includes a precision thermistor to monitor
> the
> temperature of the oven to prevent this.
>
> Any comments?
>
> Ed
>
> Good luck.
>
> -John
>
>
> Thanks.  This is turning into an interesting project.
>
> Ed
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