[Lowfer] "WE" in QRSS-60 now and freq measurements...

Mon, 5 Aug 2002 16:43:40 -0700 (PDT)

Hi,

See right side of http://www.bldrdoc.gov/timefreq/

Also, see
http://www.bldrdoc.gov/timefreq/cesium/fountain.htm
"The uncertainty of NIST-F1 is less than 2 x 10-15,
which means it would neither gain nor lose a second in
20 million years! "  Operative word there is "less
than", so also see bottom of
http://www.bldrdoc.gov/timefreq/cesium/atomichistory.htm
where it states "1999 -- NIST-F1 begins operation with
an uncertainty of 1.7 x 10-15, or accuracy to about
one second in 20 million years, making it one of the
most accurate clocks ever made"

73 de Mike KB6WFC k ..

--- Ed Phillips <[email protected]> wrote:
> Jay Rusgrove wrote:
> > 
> > Ed
> > 
> > I seem to recall 1 X 10 ^-15. Does that agree with
> what you saw?
> > 
> > Jay Rusgrove, W1VD
> > 
> > Ed Phillips wrote:
> 
> 	That's in low hydrogen maser territority, and I
> thought it was better
> than that, perhaps 1 x 10^-17.  I will be talking to
> someone Thursday
> who probably will remember, as he's a mathematical
> physicist (I'm just a
> poor dumb EE) and followed the principles of
> operation better than I do.
> 
> Ed
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