[time-nuts] GRAIL USO

[Attila Kinali]

On Sat, 01 Jun 2013 13:12:52 -0700
Jim Lux <jimlux at earthlink.net> wrote:

> >> 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?
> 
> yes..
> 
> Significant vibration is only during launch. And during pyro events for 
> deployments, of course.  After you're in orbit, the vibration is very, 
> very small (bearing noise from the reaction wheels) . I doubt they're 
> making measurements while they use the thrusters.  If they're changing 
> the orientation, it's probably using wheels.  And wheel bearing noise is 
> probably fairly narrow band and harmonically related to the wheel speed. 
>   I can ask some GRAIL-ers.

Did you get any word from them on this?
 
> > Is any of the design documents for those crystal oscillators available?
> > I would be very much interested to have a look at them.
> 
> 
> Not a chance <grin>

Damn! It nearly worked ;-)

 

			Attila Kinali

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