[time-nuts] Heathkit clock available
rstasel at uoregon.edu
Fri Aug 12 15:05:56 EDT 2016
Alex (et al),
There is also the FNET project here: http://fnetpublic.utk.edu/
They have monitoring boxes that various people set up to monitor line frequency, disciplined to GPS, and upload to their servers. I have one of these boxes in my office (Unit #1033 here: http://fnetpublic.utk.edu/tabledisplay.html).
All and all, the US power grid is pretty close to 60Hz. =) It is fun to watch how each of the interconnects here in the US lead/lag 60Hz depending on the time of day, and the load on the system (at least, I assume that’s the cause).
> On Aug 12, 2016, at 11:03 , Tom Van Baak <tvb at LeapSecond.com> wrote:
>> before you buy AC line disciplined clock read that
> That old article from 2011 is misleading. It correctly describes what was being /proposed/, but it turns out NERC chose not to implement what the article (fears) talks about. There are lots of time-nuts postings about this in the 2011 archives if you want to read more. Or google for TEC (time error correction).
> So your 60 Hz timekeeping is probably fine and still loosely locked to UTC. Several of us time nuts continuously monitor mains frequency & phase for fun. It's an interesting and low-cost entry into the world of time & frequency measurement, long-term data logging, data analysis, Allan deviation, etc.
> Here's a quick plot showing the last 2 months (US western grid). Someone else (Hal?) can double check it.
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