[time-nuts] Where does the Z3801A 1 PPS come from?
John Ackermann N8UR
jra at febo.com
Mon Mar 14 14:32:15 EST 2005
John Ackermann N8UR wrote:
> Hi Tom --
> I am logging the lab temperature at
> http://www.febo.com/geekworks/therm.html and although I haven't done a
> careful correlation, I don't think the temperature change is aligned
> with the phase shift, particularly the sharp upticks that happen daily.
Well, actually I should have looked at the current temp plot before
writing that. There is about a 3 degree F increase in temperature each
day during the observation period that appears to start at ~1100 UTC (I
need to pull the data into a graphing program and zoom in on it to get a
more exact time).
The Z3801A phase shift occurs at about 0930UTC each day. That's not a
perfect correlation, but it may be more than a coincidence that two such
well defined events occur so closely; it just would make more sense if
the temperature change happened *before* the phase change...
If I have time tonight, I'll try to lay the two plots on top of each
other and see what happens.
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