Hello all, Here's my graph of the mains grid phase deviation over the last month, and for comparison the normal behaviour during the previous year:
http://wwwhome.ewi.utwente.nl/~ptdeboer/misc/mains-2018.html This is measured in Enschede, the Netherlands, by time-stamping every mains cycle using NTP for reference. Naturally, the 2018 part of the graph nicely matches the graph Detlef posted. Regards, Pieter-Tjerk de Boer (PA3FWM) On Thu, Mar 08, 2018 at 03:50:42PM +0100, d.schuec...@avm.de wrote: > > Hi, > > from new years eve until today 00:00 the European Electricity Grid entsoe > lost 16891 sinewaves, nearly 338 seconds. Enclosed you find the sketch of > the development. From March 2 they are going to catch up again, it seems. > > I do a record of the grid frequency. My timebase is a TCXO, 0.4ppm off. I > get a frequency value for any single sinewave, precision is 1.4*10^-4 Hz. > > Cheers > Detlef Schücker > DD4WV > > (See attached file: lostseconds.pdf) > > "time-nuts" <time-nuts-boun...@febo.com> schrieb am 08.03.2018 02:16:55: > > > Von: Gerhard Hoffmann <dk...@arcor.de> > > An: time-nuts@febo.com > > Datum: 08.03.2018 02:41 > > Betreff: Re: [time-nuts] Frequency deviations in Europe affect clocks > > Gesendet von: "time-nuts" <time-nuts-boun...@febo.com> > > > > > > > > Am 07.03.2018 um 22:09 schrieb Poul-Henning Kamp: > > > > > >> This explains why my oven clock and the time/temperature display > > >> on the building outside my apartment in Switzerland are six minutes > > >> slow since January. It was a great mystery to me. > > > Can you get a picture of this ? It would be wonderful to have for > > future discussions... > > > > > Does that help? > > > > < > > https://www.flickr.com/photos/137684711@N07/38870750440/in/ > > album-72157662535945536/ > > > > > > > Input to the counter is just an AC wall wart with a voltage divider to > 4Vpp. > > Now, the frequency has risen to above 50.02 Hz constantly. It is in the > > middle of the night after all. > > They have to catch up. > > > > BTW I have decided to build an analog phase noise tester of my own. This > > weekend > > I did most of the mechanical things, but it is still in a kit state. > > > > The pictures are to the left of the 49 Hz-Pic. > > The 1-to-6 coax relays are part of the switchable lambda/4 delay line, > > so I can enforce > > quadrature everywhere above 5 MHz, including unknown amplifiers etc. > > Still looking for 2 more 1:6 relays. > > > > The mixers and dividers are in stereo, so I can do cross correlation in > > the 89441A. > > One of the mixer/preamp units is open, the ref oscillators will be > > MTI-260s on > > my oscillator carrier board. > > > > Have a good night, > > Gerhard > > > > _______________________________________________ > > 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. > _______________________________________________ > 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. _______________________________________________ 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.