Having a diversity of refclocks is important for any real NTP implementation. There is a strong tendency towards a GPS monoculture and the implementers must work against it.
Support for WWV in ntpd using the wwv_audio refclock is very good and delivers jitters substantially less than a millisecond. I have been using this for over a decade. ntpd also supports CHU. Here is a recent article showing how to use the BPSK format of WWVB: http://www.arrl.org/files/file/QEX_Next_Issue/2015/Nov-Dec_2015/Magliacane.pdf Tim N3QE On Sun, Feb 28, 2016 at 2:09 AM, Sanjeev Gupta <gha...@gmail.com> wrote: > Hi, > > I am reviewing and expanding and for the NTPSec project < > http://www.ntpsec.org >, a fork of NTP. > > Among NTPSec's goals are a smaller, auditable, code-base; hence support for > receivers last available in the early-1990s is being removed. > > I have been on this list for some years (thank you), but as I am in > Singapore, I did not pay attention to the WWVB format change. I understand > that as a result of the change, precision equipment may not be able to > recover a usable signal from the new modulation scheme, rendering it > useless for the sub-100 microsec disciplining. > > However, I am not clear if WWV and WWVH are still usable by commercially > available equipment, or of such equipment is also obsolete now. > > I have read Wikipedia, the NIST pages, etc, and am still confused. Could > someone summarise current state: > > > 1. Are there commercially (or widely-used) receivers for professional > use which listen to the WWVB signal? > 2. Are there commercially (or widely-used) receivers for professional > use which listen to the WWV(H) signal? > > A supplementary question: If you have your own homebrew for these signals, > do you use them as a refclock for NTP? > > Thank you > > > -- > Sanjeev Gupta > +65 98551208 http://www.linkedin.com/in/ghane > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.