Brooke,
Let me clarify this a bit more.
> It's my understanding the a properly working Cs standard probably has it's
> frequency slightly off from perfect, but does NOT have any drift in
> frequency.
Agreed. Over a month there should be no obvious
frequency drift in a Cs standard. However, from
Brooke,
Correct, with a Cs standard you can expect that there
will be no long-term drift in frequency. However if you
look at the short-term you will often see trends that
look like drift. In your S/N 1227 plot both red and blue
show trends on the order of 3 to 4 days. You are wise
not to call thi
Hi Tom:
The plot with red and blue is the old data on s/n 1227 where the red
points are from LORAN-C and the blue points from GPS.
s/n 1227 = http://www.pacificsites.com/~brooke/pdf/Cs_Drift0429.pdf
from April 29, 2005.
This might be a clue to the problem I'm now having with s/n 1013.
http://w
Brooke,
> For the last couple of weeks it has shown a parabolic plot like s/n
> 1227, although this time the polarity is opposite that of s/n 1227 which
> also showed drift, but that may be a setup difference. A plot of s/n
> 1227 is at: file:///C:/Webdocs/pdf/Cs_Drift0429.pdf
This plot has
Hi John:
No, the plots are of the raw data. Comparing this morning (8:27) @ 892
ns with yesterday morning (8:27) @ 858.2 gives a linear slope of 3.7E-13.
This may be the Ultra Stable Oscillator, but I don't see how changing
the C-field would effect it. That is, if the C-field is changed then
Hi Brooke --
Did you remove any linear offset before generating thorse plots? They
sure look a lot more like an Xtal aging with offset removed, than a Cs.
I wonder if it might be related to your use of the 1MHz output, rather
than 1pps, to drive the stop input. Maybe you're slipping cycles du
Hi:
Sorry for the bad links, here are good ones:
Today's plot = http://www.pacificsites.com/~brooke/pdf/sn1013_850_Drift2.pdf
s/n 1227 29 Apr 2005 plot =
http://www.pacificsites.com/~brooke/pdf/Cs_Drift0429.pdf
Brooke
Brooke Clarke wrote:
>Hi:
>
>A year ago I took apart the FTS4060 that was DO
