[time-nuts] Ultra Stable Rb

[Bob kb8tq]

Hi

A few of the long running FRK’s ( in a very similar package …
hmmm ….. wonder why …. yes, I was there way back then 
and know very well why :) ) have crazy good long term aging. 
That said, I don’t think that I’ve seen a FRK quite this good.

Thanks for sharing !!!

Bob

> On Apr 8, 2020, at 9:45 AM, martyn at ptsyst.com wrote:
> 
> Hi Guys,
> 
> Just though you'd be interested in my prototype rubidium frequency standard
> I made in the 1990's.
> 
> http://www.ptsyst.com/RFS10-FrequencyDrift.pdf
> 
> I have measured its frequency at random intervals for the past 18 years.
> 
> Its never been adjusted and is just free running.
> 
> It was turned off in 2005 and sent to a customer in Japan for a few weeks,
> then returned and turned back on.
> 
> For the past 18 years its stayed within plus/minus 3 x 10E-11.
> 
> The overall linear drift is something like 1.85 x 10E-13 per month.
> 
> This is not an advert.  There's no way any of our production units are as
> good as this one, well I assume so as I've never measured any for 18 years
> continuous!
> 
> Its now over 25 years old, have hardly ever been turned off.  Any day I
> expect it to fail, but it keeps on running!!
> 
> Regards
> 
> Martyn
> 
> 
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