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