[time-nuts] PRS10 MDEV

Chris Burford CBURFORD1 at austin.rr.com
Sun Oct 14 23:07:32 EDT 2018


Tom,
This is just a free running PRS10 wired to a TAPR TICC, I thought that
I would run some stand alone tests before I brought my GPSDO in line
too. The PRS10 is the source for the 10MHz as well as reading the 1PPS
output from it.
Chris

	-----------------------------------------From: "Tom Van Baak" 
To: "Discussion of precise time and frequency measurement"
Cc: 
Sent: Sunday October 14 2018 9:45:46PM
Subject: Re: [time-nuts] PRS10 MDEV

 Chris,

 Thanks for sharing the plot.

 What instrument are you using to make the measurements? And what
frequency reference is being used? Is this a free-running PRS10, or is
it locked to GPSDO with some time constant?

 Is that same GPSDO being used as a reference for your measurements?
The plateau looks very much like GPSDO behavior and the slide into
e-14 and e-15 territory looks like you're measuring a PLL.

 /tvb

 ----- Original Message ----- 
 From: "Chris Burford" 
 To: 
 Sent: Sunday, October 14, 2018 7:07 PM
 Subject: [time-nuts] PRS10 MDEV

 > Hello All,
 > I've collected several data sets over the last few days from my RFS
 > and I'm puzzled by what I'm seeing. A link to the plot is here:
 > https://drive.google.com/open?id=10Kk8Cqx7es0SXf2H5AldiQkBo8nIfNMT
 /> > I'm looking at the averaging periods from about 100 thru 400 tau
and
 > noticed a "plateau" or a brief level off period and then it
proceeds
 > down and right again. Is this flat area a function of the averaging
 > algorithms for the MDEV or is it something else?
 > I have spent considerable time in reading "Techniques for Frequency
 > Stability Analysis" by W.J. Riley and a host of other publications
 > (NIST, etc) in preparation for this. I would enjoy hearing from any
 > readers that may have some insight as to what I'm seeing and or
 > possible causes.
 > Thanks for reading.
 > Chris
 > _______________________________________________
 > time-nuts mailing list -- time-nuts at lists.febo.com
 > To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
 /> > and follow the instructions there.

 _______________________________________________
 time-nuts mailing list -- time-nuts at lists.febo.com
 To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
 /> and follow the instructions there.



More information about the time-nuts mailing list