[EAS] Homeland Security Staff locked out of computers?

[Botterell, Arthur@CalOES]

Many years back I visited WWV.  At that time they sync'd their on-site clock with the one down at the (then) Bureau of Standards office down in Boulder by getting a stream of correction data relative to the color subcarrier of one of the Denver TV stations.

Also, they told me that for WWVB there were no tuned circuits in between the crystal and the antenna.  The antenna itself apparently had enough Q for the whole system.

Or maybe they were just pulling the kid's leg...

Art
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From: EAS <eas-bounces at radiolists.net> on behalf of Mike McCarthy <towers at mre.com>

Well...considering the Naval Observatory is the offical reference, I'm not
sure it makes a hill of beans difference as to whether WWV is active or
not for a brief period of time.

If the N-O goes off line, that's a little different and the NIST clocks at
Boulder and Hawaii need to pick up.

FWIW, there was an article in a recent IEEE Spectrum issue which dove into
the increasingly challenging task of further refining the time standard.
The current state of the art is 10 (-15--quadrillionth) with a specific
goal to reach 10 (-18 quintillionth ) by sometime next decade.

Not that a few hundred quadrillionth's of a second here or there between
friends really matters....other than the fact 1520ft. of earth passes per
second at the equator. Or about a ft. every 650uS, inch every 55uS.

MM

On Tue, February 21, 2017 5:55 pm, Phil Johnson wrote:
> The multiple Cesium clocks at WWV and WWVB at Fort Collins, Colorado, are
>  good to one part in 10 to the minus 12th.  Same with the three Cesium
> clocks at WWVH (Kauai).  Two of three clocks must agree (I saw them on
> Kauai last
> May), or the transmitters automatically shut down and generate an alarm.
>

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