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 <d...@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, mar...@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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