I have servers at two sites: At home (northern part of Silkeborg, .dk),
and in the center of Silkeborg. Population count about 40000.
The location matters, since these two sites are on different 60kV radials.
I have clocks at both locations, so I decided to see how well I could do
time transfer between the two sites, only using the power line. A poor
man's common view experiment.
http://mx15.kasperkp.dk/plcv.png
I expected it to be a lot worse. 100us is 1.8 degrees phase error, or
10V slicer offset on 230V. Since the sense circuits are really cheap
opto couplers, and the temperature variations on the 'city server' are
rather extreme (parking basement), they can be responsible for an error
at least this large.
I have a set of slightly linux specific sources that generate a shm
refclock from the local power line and a remote observing server with a
real refclock, if anyone wants to play with this.
/Kasper Pedersen
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