[time-nuts] PRS10 MDEV

Tom Van Baak tvb at LeapSecond.com
Sun Oct 14 22:45:46 EDT 2018


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" <CBURFORD1 at austin.rr.com>
To: <time-nuts at lists.febo.com>
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
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