[time-nuts] Ultra Stable Rb

[Dana Whitlow]

Bob, what I' was getting at was: what do you do differently to make a
stable Rb versus one
that drifts a lot?  Never mind price issues.

Could one buy, say, a PRS-10, extract the physics package from it, then
engineer a stable
Rb with that as a core?

Dana


On Wed, Apr 8, 2020 at 4:19 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> The GPS Rb’s are “couple million dollar” sort of devices. Once GPS is up
> and running,
> the order volume drops off. The idea was to branch out into the broader
> military market.
> The design of the FRK did not change in any way as the price “morphed”.
> They simply
> had been making a pretty healthy margin on the product.  What happened to
> the RFS
> in the years after I left … no idea.
>
> Bob
>
> > On Apr 8, 2020, at 4:32 PM, djl <djl at montana.com> wrote:
> >
> > 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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