[time-nuts] Cesium DOES Drift, not

Brooke Clarke brooke at pacific.net
Wed Apr 20 14:56:58 EDT 2005

Hi Bill:

I wish it was something that simple, but this is a brand new unit.

Have Fun,


Bill Hawkins wrote:

>How about this:
>Brooke is watching the last of his cesium evaporate.
>Bill Hawkins
>-----Original Message-----
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>Behalf Of Brooke Clarke
>Sent: Wednesday, April 20, 2005 11:33 AM
>To: Discussion of precise time and frequency measurement;
>richard at karlquist.com
>Subject: Re: [time-nuts] Cesium DOES Drift, not
>Hi Rick:
>I agree. 
>It's just that my FTS4060 IS drifting.
>The Excel equation and fit for a month of data as of this morning are:
>y = -1.2954x2 + 243.1x - 10631
>R2 = 0.9607
>Where y is in ns, x is the Day of Year and R2 is the quality of the fit 
>(very good).
>The first derivative (after dividing by 86400) gives:
>Offset = -3E-14 * X + 243
>i.e. minus 3E-14 per day.
>I'll keep watching and post from time to time, maybe this will stabilize???
>Have Fun,
>Brooke Clarke, N6GCE

w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml

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