Hi Ok, so 0.1 second at the sync point is indeed a reasonable estimate. If that’s all you need to deal with (you correct out the crystal offset one way or the other) then:
At 1 day you have 11.5 ppm accuracy. Roughly a 100 Hz beat note with WWV at 10 MHz. At 10 days you have 1.15 ppm. Roughly a 1 Hz beat note at 10 MHz. At 100 days you have 0.115 ppm. That would be about a 10 second period beat note. None of that is to say that a beat note is all there is to getting accuracy off of WWV or that the two approaches deliver the same net accuracy. Yes I’ve done the 10 second beat thing, it can be done with care and a good stable WWV signal. Bob On Feb 23, 2014, at 5:21 PM, Tom Van Baak <[email protected]> wrote: >> Now that you have brought up this subject, do you know of any way to use >> these LaCrosse clocks to calibrate frequency standards? > > I suggest using a direct electric (1.5 VDC high-Z) or indirect magnetic (high > gain) pickup on the coil to get the +/- pulse per second. Compare this time > with your local frequency standard and over several days you should get > accuracy better than 10 ms per day (1e-7). Here's an example of a raw phase > plot: > http://leapsecond.com/pages/Junghans/ > > /tvb > > _______________________________________________ > 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.
