IIRC they changed the modulation scheme to get wider coverage at the expense of timing accuracy. Between that and the ready availability of GPS receivers, WWVB fell out of favor in the timing community. It’s still well used for setting alarm clocks, et. al. -wis From: Steven Sommars <stevesommarsntp@xxxxxxxxx>
Sent: Wednesday, October 23, 2024 8:05 AM
To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [chrony-users] Re: Any nice example of chrony, WWVB, Raspberry Pi ? I haven't seen any NTP Stratum 1 servers with Ref ID=WWVB for years. Current WWVB radios seem to lack a PPS output. On Wed, Oct 23, 2024 at 01:58:56AM +0000, Mike Collins wrote:
> Any ideas where to look ?I'm not actually quite sure i have everything implemented correctly, but I did as best i could find, on the web, and nothing had an example with a WWVB board.Everything was GPS based.
I missed the fact that it's not GPS.
What WWVB board do you have? I don't have any experience with WWVB. We
have DCF77 around here. There is a lot of noise in that part of the
spectrum. The receiver/decoder needs to be have its own clock to be
able to provide a stable PPS signal and reconstruct the messages
reliably. It cannot compete with GPS, but I think it should have
better stability than 10s of milliseconds.
--
Miroslav Lichvar
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