[time-nuts] OCXO sensitive to gravity
gsteinba52 at aol.com
gsteinba52 at aol.com
Thu Aug 13 23:30:02 UTC 2009
Date: Thu, 13 Aug 2009 15:34:43 -0700 (PDT)
From: "Rick Karlquist" <richard at karlquist.com>
Subject: Re: [time-nuts] OCXO sensitive to gravity
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
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<c537a80798ce331ab1effbc1f05db353.squirrel at webmail.sonic.net>
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Tom Duckworth wrote:
> The orientation change is due more to the earth's magnetic flux effect on
> the oscillator, and less so from gravity.
>
> Tom
> Tom Duckworth
> tomduck at comcast.net
Sorry, this is simply incorrect. Magnetic flux from the
earth has no effect on quartz oscillators. There is no
mechanism there. Acceleration definitely affects quartz.
Magnetic flux could have an effect on atomic standards,
but they normally have magnetic shielding to mitigate
this effect. Orientation (or at least acceleration)
can affect cesium beam standards because the atoms
are flying. Len Cutler put in a fix to mitigate against
this in the 5071A CBT. AFAIK, orientation doesn't affect
Rb standards.
Rick Karlquist N6RK
***? O M G? ***
Don't tell me Len pulled their little wings off !
Jerry
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