[time-nuts] GPSDO time constant

[SAIDJACK at aol.com]

Hi Magnus,
 
all depends - in an aircraft you have 6g+ turn-overs :)
 
We make a version of our FireFly-II GPSDO with ultra-low-g sensitivity and  
ruggedization, that one you can run in a back-pack while doing skating-tricks 
on  a ramp and you won't see much change in frequency. A bit more pricey on 
that  OCXO of course.
 
Most "standard" oscillators will have about 1-2ppb change after a  turn-over. 
I have seen some that actually change the Crystal temperature when  turned 
over, so you can see the initial frequency change due to gravity, then  you see 
the operating current change, and the frequency slowly drift away as the  
temperature of the crystal is changed. Bad. Very bad.
 
bye,
Said
 
 
In a message dated 1/8/2009 09:29:41 Pacific Standard Time,  
brooke at pacific.net writes:

Magnus  Danielson wrote:
. . .
> Most labs would have issues with a 2g  turnover. :)
>
> Flipping oscillators that runs is evil and should  be avoided at all
> times. Should be in the rulebook for  time-nuts.
>
> Cheers,
>  Magnus