Cant speak to the U of M's setup, but at UND they just lined the whole room with fine wire mesh. I suppose you could line the inside of a wood cabinet with a wire mesh to get an effective Faraday cage, but you should be carefull to not have the MB touch it in and have it short out the power and ground rails. The aluminum spray idea also seemed to be a good way to go, although I don't know where you find it. Kelly Black KB0GBJ On Monday 14 January 2002 09:01, you wrote: > 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? ;)