On Mon, Jan 14, 2002 at 08:05:54AM -0600, Jared Burns wrote: > You machine will emit RF (radio frequency) radiation at the > frequency of your machine's clock frequency (100kHz, 133kHz, etc.). Boy, I wish it were that simple. And the clock freqs you list don't make a lot of sense. The trouble is that for one, you have more than one frequency in the machine -- what about the video outs? What about clock dividers / multipliers? The other problem is that we like nice mostly square pulses, but that means boatloads of harmonics -- IIRC a single Dirac pulse function is energy at all freqs. Anyway, the upshot is that both harmonics and sub-harmonics are generated in scads, so your radiated spectra is anything but clean. (Kelly or any other Hams -- keep me honest here.) For that matter, you're violating some FCC rules/laws if you let these kind of emissions out, but that doesn't mean they'd catch on. > Make sure you have the components inclosed in a Faraday cage or you > and your neighbors will have a hard time picking up radio signals > (at least around the frequency of your clock) while your machine is > running. :) Speaking of Faraday cages, does anyone know what it is they do that they needed to build one around the new Alumni center at the U? ;) -- "Trying to do something with your life is like sitting down to eat a moose." --Douglas Wood