[time-nuts] CS reservoir depletion

Bob Camp lists at rtty.us
Fri Jan 14 13:40:31 EST 2011


Hi

I've seen some 10811's in GPSDO's that take many weeks to settle below 3.0 x
10^-10 per day. It's rare to see one that's been on power recently behave
that way. The ones I'm looking at have been off power for years and stored
in an outdoor shed (no heat / cooling / humidity control). 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Rick Karlquist
Sent: Friday, January 14, 2011 1:34 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] CS reservoir depletion

Bob Camp wrote:
> Hi
>
> There is a lot of data that says crystals "relax" while off power. The
> older
> they are (the older the process) the more likely they are to do so. The
> net
> effect is that they will move much faster on a per day basis than you
> would
> expect them to. They will eventually calm down, but it can take months.

My experience with 10811's is that it didn't matter much whether
they have been off for a week or a year as far as settling down
was concerned.  Also "on and off" effectively refers to the oven.
Turning the oscillator on and off while keeping the oven on
continuously has little effect.

Rick Karlquist N6RK


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