> If we all did this, then I realize that we could identify the different > power grids. However, I wonder if there is any interesting variation > *within* a grid. As the electricity flows vary throughout the day, it > seems possible that the phase difference between two people on the same > grid would actually change (a bit). > > Has anybody done this experiment? > > Philip
Yes, it's really quite interesting and very easy to do. Check the time nuts archives -- over the years there are by now hundreds of postings about measuring mains phase and frequency. See also: http://leapsecond.com/pages/mains/ http://leapsecond.com/pages/mains/mains-picpet-23.gif http://leapsecond.com/pages/ac-detect/ There are many wonderful web sites that deal with power line frequency; some with live plots. Just google for words like: mains frequency detect accuracy stability measurement Also, make sure to read the growing literature about ENF: http://en.wikipedia.org/wiki/Electrical_network_frequency_analysis /tvb _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
