[time-nuts] WWV/WWVB in NTP surveys

Tim Shoppa tshoppa at gmail.com
Sun Sep 2 09:48:21 EDT 2018


Some stats in historic NTP surveys show that WWV and WWVB based refclocks
were relevant 20+ years ago:

1997 - Mills survey - 47 GPS and GOES vs 74 WWV and WWVB.

1999 - Minar MIT survey - 129 GPS and GOES vs 24 WWV and WWVB.

In those two years it is pretty obvious the world was swinging from LF and
HF refclocks to satellite based refclocks (and also obvious that GOES was
declining while GPS was on the upswing.)

As recently as 10 years ago I was running a WWV-based Stratum 1 - it's
there in the 2005 Brazillian NTP survey data.

It would be much easier to make a case for continuing WWV service if there
were commercial WWV based refclocks on the market and used in
commercial/government applications. 10 years ago I could find WWV time
clocks in industrial automation catalogs but today, nothing. I'm sure
there's some installed base.

Tim N3QE

On Sun, Sep 2, 2018 at 9:08 AM Peter Laws <plaws0 at gmail.com> wrote:

> On Sat, Sep 1, 2018 at 7:25 PM Bob kb8tq <kb8tq at n1k.org> wrote:
>
> > I most certainly *have* seen an NTP server that ran off of WWVB and
> relayed
> > the result to the internet. The fun part was that they had entered the
> “delay”
>
> I didn't say it COULD not -- W3HCF and his group didn't miss much in
> the code -- but what I'm saying is that in 20+ years of dinking with
> NTP as part of my job, I HAVE not seen any evidence of WWV being used
> as a "refclock".  Certainly not in the last decade.  Maybe there were
> many of them when Dr Mills first published the standards and reference
> implementation back in the 1980s but not now.
>
> I want to be outraged over this cut but until I have a coherent,
> evidence-based argument in favor of keeping the stations, I'm going to
> keep my powder dry.
>
> --
> Peter Laws | N5UWY | plaws plaws net | Travel by Train!
>
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