[time-nuts] WWV/WWVB in NTP surveys

Björn bg at lysator.liu.se
Sun Sep 2 10:18:32 EDT 2018


Hi,

There are LF receivers available commercially today. See links below for one vendor.
    https://www.meinbergglobal.com/english/products/pci-express-dcf77-clock.htm

and even an USB version for the NIST signal.

https://www.meinbergglobal.com/english/products/usb-wwvb-clock.htm

And there seems to be options for wwvb reception also in 1u 19” format.

https://www.meinbergglobal.com/english/products/rack-mount-1u-ntp-server.htm

/Björn 

Sent from my iPhone

> On 2 Sep 2018, at 15:48, Tim Shoppa <tshoppa at gmail.com> wrote:
> 
> 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


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