[time-nuts] Ultra Stable Rb

[djl]

What a tease!!!!! OK, very well WHY???
Don

On 2020-04-08 08:04, Bob kb8tq wrote:
> 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
>> 
>> 
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at lists.febo.com
>> To unsubscribe, go to 
>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>> and follow the instructions there.
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.

-- 
Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304