That IS interesting.. It reads to me that the advice is to keep a "moving 300 pt ADEV" when continously monitoring a (pair of) frequency source in e.g a VLBI site - the reason for limiting it to 300 pts being that much more than that is likely to average out potential issues..
Does that make sense? > Den 13. jan. 2017 kl. 17.04 skrev Bob Camp <[email protected]>: > > Hi > > There’s an interesting comment buried down in that paper about limiting ADEV > to > < 300 samples per point. Their objective is apparently to better highlight > “systematic > errors”. I certainly agree that big datasets will swamp this sort of thing. > I’m not quite > sure that I’d recommend ADEV to find these things in the first place. My > guess is that > it’s the only spec they have to call the device good or bad in this case > …They don’t seem > to have Hadamard in their list of variances. If I was going after systematics > with a deviation, > that’s the one I’d use. Of course I probably would not use a something-dev in > the first place. > > Bob > > >> On Jan 13, 2017, at 1:52 AM, Ole Petter Ronningen <[email protected]> >> wrote: >> >> Hi, all >> >> The question of phase shifts in cables pops up every now and then on this >> list - I stumbled across a good table of measured phase shifts with >> temperature in different cable types in this paper: >> http://www.ira.inaf.it/eratec/gothenburg/presentations/ERATEC_2014_PresentationWSchaefer.pdf >> that I though would be of interest to others. >> >> A quick summary given below, see pdf for full details. Lots of other >> interesting stuff in there also. >> >> Values in ppm/K, for 10 Mhz except when otherwise stated. (The paper gives >> values for 5, 10 and 100Mhz) >> >> Huber-Suhner Multiflex 141: -6 >> RG-223: -131.9 >> Semiflex Cable: -11.5 >> Huber-Suhner: -8.6 >> Times Microwave LMR-240: -3.4 >> Times Microwave SFT-205: 7.7 >> Meggitt 2T693 SiO2: 30.6 >> Andrew FSJ-1 (@5Mhz): 25 >> Andrew FSJ-4 (@5Mhz): 10 >> Andrew LDF-1P-50-42: 2.8 >> Andrew LDF4-50A: 4.7 >> Times Microwave TF4FLEX (@100Mhz):6.4 >> Phasetrack PT210 (@100Mhz): 2 >> >> Ole >> _______________________________________________ >> 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. _______________________________________________ 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.
