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

[Brian Justin]

Don't recall if this was already suggested.....
but could he be using GPS time as his local reference?

Right now that's ~16 seconds off from UTC and the correction
offset is in the GPS data stream, but you have to remember to use it.

-Brian, WA1ZMS




----- Original Message ----
From: Bob Camp <lists at rtty.us>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Thu, August 4, 2011 12:40:04 PM
Subject: Re: [time-nuts] What is NIST "official time" ?

Hi

A few ideas for checking things out:

If you check your reference against CHU or one of the other standard
stations what do you see? They all are transmitting UTC, so they should
agree. 

Propagation delay from half way around the earth is around 67 ms (12.5K
miles / 186282 miles per second). That's pretty small compared to a 20
second error. Any time station anywhere would do fine as something to check
against.

Another check would be to lock up a computer via NTP and see what it shows
compared to your reference. Even a "bad" NTP setup will be plenty good
enough to help troubleshoot something like this. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Albertson
Sent: Thursday, August 04, 2011 12:02 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] What is NIST "official time" ?

On Thu, Aug 4, 2011 at 7:16 AM, Christopher Quarksnow
<cquarksnow at gmail.com> 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

I think something must be wrong with the way you are measuring.
Propagation can't time add 20 seconds  Can you explain exactly what
how you are measuring.

Chris Albertson
Redondo Beach, California

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