[time-nuts] Weird TEC data
Scott Newell
newell at cei.net
Wed Aug 3 02:18:17 UTC 2011
Here's the latest plot from my TEC test rigs. Y-axis is phase error
(in 60 Hz cycles), X-axis is time in MJD. The plot starts at 7AM local time.
http://n5tnl.com/tec/tec_test_01.png
Same serial connected embedded hardware, timestamped on the receipt
of first character. One machine (red line) is a Sun running debian,
the other (green line) is a Dell PC, also running debian. Both
running ntp, of course. One is located in a fairly large city (by
Arkansas standards!), the other is out in a small country
town. Different utility providers.
The general shape and bumps in the plots track nicely, but I'm
wondering why there's so many cycles difference after 36 hours.
Comments?
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