[time-nuts] Ultra Stable Rb

[djl]

So it's Chinese engineering? Find something good that works, start 
removing parts until it doesn't, put in the part last removed, and sell 
it?

My granddad worked for a guy in LA called Madman Muntz who made tv's 
that way in the late 1940's. They worked. Sorta. For a while. If the 
signal was strong enough.
Voila! $X-$400

On 2020-04-08 13:51, Bob kb8tq wrote:
> 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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-- 
Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304