WWVB?

[MAYER Hans]

Dear Paul,

In the meantime I build several stratum-1 server. There are GPS-based, rubidium controlled and DCF77.
See also my blog to various topics about NTP. http://blog.mayer.tv/
DCF77 is very similar to WWVB. A DCF77 trasmitter is in Europe and sends on 77.5 kHz.
Offset for DCF77 is about 1000 times worse than GPS or rubidium based.
But if you have nothing else as stratum-1 in your LAN then it’s better than nothing.
DCF77 is easy to build. Propably WWVB too.
GPS is also straight forward.
Rubidium based NTP needs a lot of adjustment and scripting.


// Hans

—



On 31.07.2018, at 22:08, Paul Theodoropoulos <paul at anastrophe.com<mailto:paul at anastrophe.com>> wrote:

Scratch that. Remember: Always websearch first. Always websearch first. Always websearch first. ;)

tl;dr: WWVB is great for wall clocks - literal wall clocks. It's too unstable for computer use, for the most part. It'd be a curiousity to build, but not a reference to use.

On 7/31/18 12:18, Paul Theodoropoulos wrote:
I ran across this:

http://a.co/7iIS21N - Canaduino WWVB 60kHz NIST Atomic Clock Receiver w/antenna

Which has PPS output.

Would there be any value in attempting to get this working on a Raspi as a clock source? Or is the nature of a radio signal from well more than a thousand miles away from me too prone to fluctuations due to atmospheric conditions, interference, etc - compared to my existing GPS based timeserver? It's cheap enough that I might give it a whirl regardless, just to see if I could do it.

--
Paul Theodoropoulos
www.anastrophe.com<http://www.anastrophe.com/>



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--
Paul Theodoropoulos
www.anastrophe.com<http://www.anastrophe.com/>

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