[time-nuts] What is NIST "official time" ?

jmfranke jmfranke at cox.net
Thu Aug 4 14:50:44 UTC 2011


What is your reference for UTC time. It appears Boulder is broadcasting the 
correct values for UTC, so the next element to examine is the reference to 
which you are comparing Boulder's broadcasts.  Could it be GPS time?

John  WA4WDL

--------------------------------------------------
From: "Mike S" <mikes at flatsurface.com>
Sent: Thursday, August 04, 2011 10:36 AM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Subject: Re: [time-nuts] What is NIST "official time" ?

> At 10:16 AM 8/4/2011, Christopher Quarksnow wrote...
>>Wondering whether anyone can clarify what discipline the Boulder, CO NIST
>>facility is broadcasting (or showing on time.gov) and qualified as "The
>>official U.S. time".
>>It appears to be about 20 seconds slower than UTC and I could not find the
>>relation to other known time scales such as TAI, UTC, ET, UT1, GPS or
>>possibly grid or broadcast-interconnected reference.
>
> NIST broadcasts UTC, they even say so in the broadcast - "At the 
> tone...Coordinated Universal Time".
>
> http://www.nist.gov/pml/div688/grp40/wwv_format.cfm
>
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