Hi
You have roughly 25 ns p-p in the data you show. There are a number of 10 ns “cycles” in the data. Any of this *may* be due to ionosphere. They also could be due to other issues. With ~4.4 days of noisy data, it may be tough to spot a trend. Since the ionosphere is a bit random, there is no guarantee that you *will* always see a pretty sinusoidal trend line through the data. It’s a good bet that things quiet down around midnight. There is no guarantee that they always go nuts (or go nuts to the same degree) around noon. Bob > On Apr 27, 2017, at 12:48 PM, Bob Stewart <b...@evoria.net> wrote: > > Hi Magnus, > Try as I might, the weather and the local power company had other ideas about > my long term capture. I'm running everything but the 5370 from a UPS. I > guess I'm going to have to get batteries for my other UPS and run the 5370 > from that. A one second power loss was all it took to stop the test. > > Anyway, I did manage to get 376,238 points of data. The data is captured on > a 5370A. The external clock input and the STOP channel are fed by the 10MHz > from my PRS-45A. The START channel is fed by the 10MHz from one of my > GPSDOs. The EXT channel is fed by the 1PPS from another of my GPSDO units. > "EXT ARM" is enabled. So, essentially, at every 1PPS pulse, the phase > difference between the two 10MHz feeds is captured. > > I've attached a screenshot of the phase plot which can also be found > here:http://evoria.net/AE6RV/Timelab/Screenshot.png > I've also made the timelab file (compressed by 7z) available here: > http://evoria.net/AE6RV/Timelab/GFSvsCS.4.22.17.7z > > So, back to my question: Where are the large ionospheric phase moves? This > question has been causing me doubt since I started on this project. Or don't > I still have enough data collected for this to happen? > > Bob > > ----------------------------------------------------------------- > AE6RV.com > > GFS GPSDO list: > groups.yahoo.com/neo/groups/GFS-GPSDOs/info > > From: Magnus Danielson <mag...@rubidium.dyndns.org> > To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency > measurement <time-nuts@febo.com> > Cc: mag...@rubidium.se > Sent: Tuesday, April 18, 2017 1:09 AM > Subject: Re: [time-nuts] Three-cornered hat on timelab? > > Hi Bob, > > That is a good solution indeed. Good luck with that measurement run! > > One of the fun stuff with Timelab is that you can walk by and check the > developments. I've found that very useful for long measurements (as in > hours and days). > > I prepared a cesium for one vendor, and initially they did not care so > much, but then they saw more deviations between the receivers, so they > wanted to sort it out, but discovered that they could not cancel out the > common mode of GPS signals (and its shifts), so then firing up that > cesium was the right thing. I remember writing support emails while > waiting for the airplane in Madrid airport, happy that they was doing a > first run for the right measurement reason. :) > > Cheers, > Magnus > > On 04/18/2017 04:25 AM, Bob Stewart wrote: >> Hi Magnus, >> Today I started a long run against my PRS-45A. Maybe this time I won't have >> a power outage. I'll see what it tells me in a few days. >> Bob > > <Screenshot.png>_______________________________________________ > 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.
