Hi Bob, This is a phase plot of a rubidium to an M12 from a test that I did back in 2008. The offset and ageing have been removed, but there is still a bit of wander. As with your plot, constellation related issues appear the most obvious. Peak to peak is fairly similar too.
Angus. On Thu, 27 Apr 2017 16:48:37 +0000 (UTC), you 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 <[email protected]> > To: Bob Stewart <[email protected]>; Discussion of precise time and frequency > measurement <[email protected]> >Cc: [email protected] > 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 > >
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