Re: [time-nuts] Eclipse alert - Call for VCO traces
Hi Magnus, temperature data will be welcome, of course. I didn't ask for them in order to keep my request simple, with the hope to get more answers. Anyway I would be pleased to see as many traces as possible, even in the lack of temperature data, and without the claim to draw any conclusion, but to see if there are strong clues. A test aimed at getting a conclusion, of course, should be designed and planned much more seriously. I hope to have contributions. Cheers, Antonio I8IOV T-bolt and Z-3801 owners with the correct software should be able to deliver suitable data. Cheers, Magnus ___ 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.
Re: [time-nuts] Eclipse alert - Call for VCO traces
iov...@inwind.it wrote: Hi Magnus, temperature data will be welcome, of course. I didn't ask for them in order to keep my request simple, with the hope to get more answers. Anyway I would be pleased to see as many traces as possible, even in the lack of temperature data, and without the claim to draw any conclusion, but to see if there are strong clues. A test aimed at getting a conclusion, of course, should be designed and planned much more seriously. I hope to have contributions. A good test would be to have two similar units logged, say T-bolts, where on is exposed to the outside solar eclipse while the other is nearby but in a more isolated and temperature stabilized environment. That way a clear dependence on temperature effect could be verified (as being expected) while the isolated reference should only see minor or small change. My current weather situation does not allow me to set it up. Besides, I currently only have one T-bolt. However, several days of -8 to -10 and 90% humidity have given the trees and bushes a lovely thick crisp white frost-bite. Need to plan for a more snow-tolerant antenna arangement... Cheers, Magnus ___ 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.
Re: [time-nuts] Eclipse alert - Call for VCO traces
iov...@inwind.it wrote: Time-nuts, many of you are routinely recording - or may easily do it - the trace of the control voltage of non-free-running crystal oscillators (disciplined by atomic resonance or GPS). Once again I'm here asking you to keep an open eye during a solar eclipse, which will occur on January 15. For meaningfull measurement shall the temperature shall be logged as well. My current opinion is that the eclipse couldn't affect atomic resonances at a measurable level for the state of the art, but could affect massive (as compared to atoms) pieces of vibrating matter. Well, it has been established that they do affect atomic clocks onboard GPS satellites and that this can be correlated to the clocks temperature dependencies. Improved temperature compensations on modern rubidiums flown has reduced this efffect to the best of my knowledge. Rubidiums have a temperature dependence due to their traditional design, but this can be reduced by design and by compensation. The control voltage trace tells us whether a crystal deviated, even in front of a constant rate of the whole clock. I recall (already mentioned in this list) that previous tests (Max Plank Institute) showed no deviations of atomic resonances, but we don't have info about control voltages, and that S.W.Zhou instead claimed to have observed deviations that indeed I believe were deviations of crystals not promptly steered. Tossing the same clock into a climate chamber and test the temperature dependence would be interesting. During this eclipse a numerous team of researchers will be conducting sophisticated pendulum tests at the Maldives (latitude near to zero, no Foucault effect), and a number of US institutions, located in the anti-eclipse path, will provide gravimeter data. Elsewhere, Russia and Florida at least, torsion balance tests will be conducted. Just to mention what I'm aware of. As far as I know, nobody will provide clock (I would say oscillator) data. Hence I' m asking this list to give a contribution. Make sure to separate temperature effects from that of any other effect, such as gravitational. What I ask is to send me your control voltage data, possibly for the days 14-15-16 January, and from preferred locations -but not only- in the eclipse or anti-eclipse path, even penumbra or anti-penumbra. T-bolt and Z-3801 owners with the correct software should be able to deliver suitable data. Cheers, Magnus ___ 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] Eclipse alert - Call for VCO traces
Time-nuts, many of you are routinely recording - or may easily do it - the trace of the control voltage of non-free-running crystal oscillators (disciplined by atomic resonance or GPS). Once again I'm here asking you to keep an open eye during a solar eclipse, which will occur on January 15. My current opinion is that the eclipse couldn't affect atomic resonances at a measurable level for the state of the art, but could affect massive (as compared to atoms) pieces of vibrating matter. The control voltage trace tells us whether a crystal deviated, even in front of a constant rate of the whole clock. I recall (already mentioned in this list) that previous tests (Max Plank Institute) showed no deviations of atomic resonances, but we don't have info about control voltages, and that S.W.Zhou instead claimed to have observed deviations that indeed I believe were deviations of crystals not promptly steered. During this eclipse a numerous team of researchers will be conducting sophisticated pendulum tests at the Maldives (latitude near to zero, no Foucault effect), and a number of US institutions, located in the anti-eclipse path, will provide gravimeter data. Elsewhere, Russia and Florida at least, torsion balance tests will be conducted. Just to mention what I'm aware of. As far as I know, nobody will provide clock (I would say oscillator) data. Hence I' m asking this list to give a contribution. What I ask is to send me your control voltage data, possibly for the days 14-15-16 January, and from preferred locations -but not only- in the eclipse or anti- eclipse path, even penumbra or anti-penumbra. Googling fred espenak you will immediately find the data for the incoming eclipse. Thanks in advance. Antonio I8IOV ___ 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.
