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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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, [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 > >>>>> _______________________________________________ > >>>>> time-nuts mailing list -- [email protected] > >>>>> To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >>>>> and follow the instructions there. > >>>> _______________________________________________ > >>>> time-nuts mailing list -- [email protected] > >>>> To unsubscribe, go to > >>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >>>> and follow the instructions there. > >>> -- > >>> Dr. Don Latham AJ7LL > >>> PO Box 404, Frenchtown, MT, 59834 > >>> VOX: 406-626-4304 > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >>> and follow the instructions there. > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >> and follow the instructions there. > > > > -- > > Dr. Don Latham AJ7LL > > PO Box 404, Frenchtown, MT, 59834 > > VOX: 406-626-4304 > > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
