[time-nuts] Comparing the performance of 17 different GPSDOs

[Bob kb8tq]

Hi

At least the HP boxes run through a series of filter settings and do a pretty good job
of handling the “lack” of SA. The one thing that is very apparent in the TDEV data on 
the 3801 is the lack of sawtooth correction. I suppose you could call that a SA optimization
that no longer is on the “good idea” list.

Bob

> On Dec 9, 2018, at 5:13 PM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> 
> --------
> In message <FE97A647F0D845F19BAA879F646EEC1D at pc52>, "Tom Van Baak" writes:
>>> Tom is currently working his magic on the raw data captures with Timelab. 
>>> The results so far are looking very good and much more informative.
>> 
>> Mark's experiment was nicely done. Here's the first set of TimeLab plots:
>> 
>> http://leapsecond.com/u/sims/gpsdo17/
>> 
>> If that's too much, just look at the last 2 or 4 plots on that page, arranged by worse than average and better than average.
>> I'll fix a couple of typos and add missing data for two of the GPSDO.
> 
> I wonder how many of these still run with SA optimized PLL time constants ?
> 
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.
> 
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