Remember the man with two clocks: here we are in the same situation. We cannot tell which of the two is being screwed up or maybe both... this is my opinion. Interesting experiment but I think it would be better if a third clock was involved, for example a Cs reference.
On Mon, Sep 3, 2012 at 9:16 PM, [email protected] <[email protected]> wrote: > Dear time-nuts, > a friend of mine, Prof. Alexander Pugach (1), did an experiment on January > 15, > 2010, comparing a Rb standard to a GPSDO during a solar eclipse. The > experimenal site was Kiev, Ukraine. > > With reference to the attached graph, his text is (note: the red curve > belongs > to another test; the curve which matters here is the bold blue one): > > **************************** > Dear colleagues, > An experiment has been made aiming to investigate, how the “daily rate of > clock” varies during a solar eclipse on 01.15.2010. > In our observatory the high-precision rubidic standard (RbSt) of frequency > is > exploited. Its indications were compared to a basic frequency from highly > stable GPS receiver TRIMBLE Thunderbolt Е. The difference obtained is > noted as > “residue” and expressed in nanoseconds (ns). > This residue was conventially set equal to 0 ns at 00h 00m 13.01.2010. The > mean “daily rate of RbSt” equals 2740 ns/d, i.e. 3.17 10-11. In the > Figure > this rate is shown with blue dashed line. What we have really registered is > shown with the bold blue curve. > The main minimum of this difference approximately coincided with the > eclipse > start on the Earth. The derivative on site А-В is approximately 6 times as > much as mean “daily rate of RbSt”. > ............ > 19.02.2010 > **************************** > > Apparently, the difference of rate of the two clocks varied by some 4000 > ns, A > to B, in the 6 hours of duration of the eclipse (s to e = start to end of > eclipse at earth, T1-T4 =eclipse in Kiev). > I would ask you time-nuts, if such a variation could be simply due to an > occasional sum of "ordinary" adverse factors such as temperature, > holdover, sky > view, multipath, etc.., or it is really too large to be explained that way. > Sorry, I've no idea of what would be the worst case for any of the above > factors. > > Thanks, > Antonio I8IOV > > (1) Prof. Pugach is a senior astronomer at the Academy of Sciences of > Ukraine. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
