Kickstarter? > On 2016 Nov 03, at 16:07 , Bert Kehren via time-nuts <[email protected]> > wrote: > > > Over the past there has been talk about building from scratch high > performance references. I think consensus was that it is out of reach. In > the mean > time Corby is reworking an active maser which takes a lot of know how. But > let us look at his work on the super HP5065. It is able to outperform a > passive maser in the below 100 second range! Long term a proper GPSDO should > be possible to step in. We are working on it including pressure and > temperature control. To make full use of it you also need to have the > capability > to monitor, record and analyze on a continuous basis preferably with out > tying up expensive equipment. We have the pieces in place and looking > forward > of combining all the pieces and compare with Corby’s active Maser. We are > back to the GPSDO after being distracted by Tbolt performance. A third party > is working combining the GPSDO data stream with the data from the unit that > generates frequency, pressure and temperature data along with time to a > USB stick, while also be able to monitor with a PC. > I know it is considered by some heresy but our lack of a Maser and in Juerg > ’s case no access to one, we try to overcome it with a GPSDO tailored for > Rb and Cs and control our Cs’s C field . > There was a time that I did have a HP5065A but got rid of it when I got > some Cs’s. My best counter was A HP5345 and even with a Tracor 527 1 second > performance was not an issue. That changed when Corby introduced me to time > nuts and frankly it was the first time I learned about ADEV. But the > HP5065A was gone. Now I have a cell that Corby has plotted and time > permitting > may become a project. > Let me get to the real issue. There are not enough HP5065A’s out there and > not affordable for all time nuts. Most are being kept and are not for > sale. But if a combined effort by many time nuts it MAY be possible to > recreate > the guts of the HP5065A. The key word is MAY. 200 time nuts be willing to > invest $ 5000 each may get us there. The market does not justify such an > effort but time nuts keep bringing up discussions. All the other ideas > kicked > around in the past will cost more. There are some among us that know what > it cost and who can make the key elements like lamps, cells, filters etc. > Just a thought outside the box and hopefully may turn in to a limited > constructive dialog. We will continue on our path, which include FRK/M100, > HP5065 > and Cs. > We would not be capable to contribute technically on the physics package > but I would be willing to contribute financially and with monitoring > equipment even if I would not be around when finished. > Bert Kehren > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.
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