[time-nuts] 15 Seconds error...??
Hal Murray
hmurray at megapathdsl.net
Thu Jan 19 08:15:23 UTC 2012
mikes at flatsurface.com said:
> You tell me, is that UTC, or UTC(USNO) or UTC(NIST), or something
> completely different?
My two cents:
They are very close. It's probably off scale for anybody but a geek to
measure the difference.
Legally, if it matters, you should specify.
I can get UTC(USNO) to sub microsecond level from GPS, but I have GPSDOs.
Most low cost GPS units are USB without PPS. Good USB units get close to the
ms range, but they are a tiny fraction of the market. Even with a PPS, you
have to make sure it is getting a good signal.
What sort of accuracy can I get from WWVB or WWV? I'd guess several or 10s
of ms. I'm in California. I'd expect better if I was closer, probably sub
ms.
--
These are my opinions, not necessarily my employer's. I hate spam.
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