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re: the 60Hz wal signal
On Aug 30, 2009, at Aug 30(Sun) 8:22 , John Denker wrote:
Fixed? Not really.
The long-term average frequency is very closely
controlled ... but there is a huge amount of
short-term frequency modulation.
Here's some data on the 'huge' shot-term variation.
not very large on a percentage basis.
data stolen from: http://www.bmumford.com/clocks/60cycle/index.html
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