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