On Mon, Jan 21, 2002 at 03:22:22AM -0600, Rick Engebretson wrote: > The fundamental frequencies such as clock frequency are not the only > problem. The harmonics are way up in the spectrum but are also the most > easily shielded. Usually, but not always. > The Fourier transform of a square wave digital pulse includes many > sine wave components of many multiples of the fundamental frequency. Well, this is true, but it's kind of a tautology. But, (having erased the mathematical post I was about to write about Fourier sine series and even harmonics) sharper corners means more harmonics. Computers make a lot of them. Maybe for a meeting (or installfest) it'd be fun if we hauled in an RF spectrum analyzer, and let everyone see how much RF was generated. Or check their individual boxes and see how icky/good they looked -- just for fun, of course. With notice, I might be able to help arrange this, though I know there are a couple of others on the list who could too. -- www.rephil.org "Trying to do something with your life is like sitting down to eat a moose." --Douglas Wood