[time-nuts] GRAIL USO (was: Looking for datasheet for Oscilloquartz 8602)
Attila Kinali
attila at kinali.ch
Sat Jun 1 15:49:16 UTC 2013
On Tue, 28 May 2013 20:23:06 -0700
Jim Lux <jimlux at earthlink.net> 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
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