Hi
That’s the way I read what they are saying. More or less: Keep the number of samples above 100, but below 300. Bob > On Jan 13, 2017, at 12:30 PM, Ole Petter Rønningen <opronnin...@gmail.com> > wrote: > > 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 <kb...@n1k.org>: >> >> 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 <opronnin...@gmail.com> >>> 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 -- 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. _______________________________________________ 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.