[time-nuts] 60Hz extra PPS: got one
Hal Murray
hmurray at megapathdsl.net
Fri Aug 10 08:51:18 UTC 2012
Actually, there were 2 extra pulses.
Here is the PPS view:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a-pick.png
(Samples every 10 seconds.)
Here is the audio view:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a0.png
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a1.png
(16 bit audio, 8 KHz)
I noticed a couple of other fishy areas:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-b0.png
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-b1.png
They didn't confuse the PPS collector.
I'm probably overlooking lots of similar glitches. I only noticed that pair
because the first one happened at the bottom of a cycle and that was big
enough to stand out. I noticed the second one because it was close enough to
the first one.
Anybody got software to emulate a PLL? I'm looking for something that will
track a sine wave and tell me when it finds noise.
I haven't seen any of the ground problems in the last day or so. I don't
know if that is just luck or if upgrading to Fedora 17 fixed something. (Or
maybe I accidentally fixed something.)
--
These are my opinions. I hate spam.
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