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Re: [Phys-l] Lissajous

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: