[time-nuts] Ultra Stable Rb

[Bob kb8tq]

Hi

At the time EG&G had done the GPS Rb’s but not done any other 
military parts. Some research showed that indeed the FRK went into 
a variety of systems and the price was $X. (It varied a bit with quantity)

Push the numbers around and look at this and that. The decision was made
that indeed if you could sell a few hundred to maybe a thousand a year at
$X, it was a good thing. A design was done and (as noted earlier) it was
a good little device. 

The fun part came with that $X pricing. Out comes a request for some few 
hundred pieces to this or that organization. Bid $X, order goes down to the 
competition for X-$300. Next request for a few hundred, bid X-$400, order 
goes down to the other guy for X-$500. This step by step process goes on 
for a year …. same result again and again. 

At the end of that time period it was far less clear just *why* one does up
an FRK like part ….

Bob

> On Apr 8, 2020, at 2:32 PM, djl <djl at montana.com> wrote:
> 
> 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
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> 
> -- 
> Dr. Don Latham  AJ7LL
> PO Box 404, Frenchtown, MT, 59834
> VOX: 406-626-4304
> 
> 
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