On Tue, 28 May 2013 20:23:06 -0700 Jim Lux <[email protected]> wrote:
> The USO's we got for GRAIL from APL have ADEV<1E-13 from 1 to 1000 > seconds, and then heads up at 1 decade/decade. The lowest ADEV is about > 5E-14 at around 50 seconds, but it's pretty flat. See the paper by > Enzer et al. Do you mean [1]? [1] "GRAIL A Microwave Ranging Instrument To Map Out The Lunar Gravity Field", by Enzer, Wang, Klipstein, 2010 > Or better, the 42ns PTTI conference paper by Greg Weaver at APL, who had > to build them. That would be [2] then? A little question here: AFAIK satelites vibrate a lot. How do they account/compensate for the vibrations in the oscillators? [2] "The Performance of Ultra-Stable Oscillators for the Gravity Recovery and Interior Laboratory (GRAIL)", by Weaver, Garsecki, Reynolds http://www.pttimeeting.org/archivemeetings/2010papers/paper28.pdf > They run in a vacuum bottle (of course), and they have somewhat > obsessive attention to a lot of details. But I suspect that aside from > the space qual aspects, the whole "how you build them" isn't a whole lot > different. Is any of the design documents for those crystal oscillators available? I would be very much interested to have a look at them. Attila Kinali -- The trouble with you, Shev, is you don't say anything until you've saved up a whole truckload of damned heavy brick arguments and then you dump them all out and never look at the bleeding body mangled beneath the heap -- Tirin, The Dispossessed, U. Le Guin _______________________________________________ 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.
