[time-nuts] GPSDO time constant
SAIDJACK at aol.com
SAIDJACK at aol.com
Thu Jan 8 18:26:48 UTC 2009
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
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