[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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