While I can not dismiss your claims about short wave interference, I can say I have run many computers without a case for extended periods of time and not run into any such interference. No AM or FM interference (although I don't listen to much AM -- occasional WCCO 830AM). No interference that I note. On the contrary, I can often here my cell phone negotiating with the tower on my FM Stereo in my car (and it is a new and quality system). Nobody has shown up at my door. There is a HAM guy in my [old] neighborhood that has a tower up behind his garage. No word from him either. Yes, I agree, use a steel case and put a nice plastic or wood case around it. Tom Veldhouse veldy at veldy.net ----- Original Message ----- From: "Steve Grobe" <steveg at transition.com> To: <tclug-list at mn-linux.org> Sent: Monday, January 14, 2002 11:36 AM Subject: RE: [TCLUG] Static electricity (and an offer to buy) > Tom, > > I gotta disagree with you. If what you said were true every PC manufacturer > would ship their product in a plastic case without any shielding. Take your > average home PC and remove it's case and it will fail FCC Class B (required > for domestic use) by at least 20dB. This is not just a problem at the main > clock frequency either, consider all the data buses with sub 10nS rise and > fall times and what you end up with a really nice broadband noise generator. > Most PCs do not meet FCC requirements with the case on. (Over the last ten > years I have tested enough of them to know.) > > The amount of interference will depend on how close you are to the radio/TV > station you are trying to monitor and their broadcast strength. It may not > bother you in the same room trying to listen to KQRS, but your neighbor down > the street trying to pick up shortwave transmissions will probably go nuts. > If you start interfering with air traffic or police/fire frequencies the FCC > can and sometimes will show up and make you shutdown your "transmitter". > > A wood/plastic case will not solve the ESD/safety problems either, the steel > in a typical computer case also serves as an earth ground for safety > reasons, a shield from ESD, and most importantly if something fails and gets > really hot steel does not easily burn. > > I'd find a small steel case and build something that looks nice around it. > > Blah, blah, blah........ > > > > -----Original Message----- > From: Thomas T. Veldhouse [mailto:veldy at veldy.net] > Sent: Monday, January 14, 2002 10:11 AM > To: tclug-list at mn-linux.org > Subject: Re: [TCLUG] Static electricity (and an offer to buy) > > > You are spending too much time in Physics class. In theory this is correct, > but the output is extremely low and should not interfere much with anything, > as per FCC regulations. It would be easier to bring in your FM to your > receiver using Coax (by nature a RF sealed system, again in theory -- or you > wouldn't need shielded cable) than it would to wrap your PC in a Faraday > cage. Not to mention, there is software out there to allow you to trasmit > AM broadcasts using your monitor -- so you need to wrap it as well. > > :) > > Tom Veldhouse > veldy at veldy.net > > ----- Original Message ----- > From: "Jared Burns" <jared-linux at mn.rr.com> > To: <tclug-list at mn-linux.org> > Sent: Monday, January 14, 2002 8:05 AM > Subject: Re: [TCLUG] Static electricity (and an offer to buy) > > > > You machine will emit RF (radio frequency) radiation at the frequency of > your > > machine's clock frequency (100kHz, 133kHz, etc.). > > > > 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. :) > > > > - Jared > > > > On Sunday 13 January 2002 02:53 pm, you wrote: > > > I'm looking at building my own PC, but in a literal sense, > > > including making a case (why not? to answer your obvious > > > question. Actually so that I don't have to have an obvious > > > computer case if I want it in the living room.) One option > > > is to house it in a plastic storage tub, but it suddenly > > > occured to me that ths may be a static electricity problem > > > waiting to happen. Any thoughts from the engineering types? > > > > > > As part of building the box, if anyone has a Socket A chip > > > of any speed they want to get rid of (i.e. if you're > > > upgrading) I'm in the market. > > > > > > Cheers, Paul > > > > > > > > > _______________________________________________ > > > Twin Cities Linux Users Group Mailing List - Minneapolis/St. Paul, > > > Minnesota http://www.mn-linux.org > > > tclug-list at mn-linux.org > > > https://mailman.mn-linux.org/mailman/listinfo/tclug-list > > _______________________________________________ > > Twin Cities Linux Users Group Mailing List - Minneapolis/St. Paul, > Minnesota > > http://www.mn-linux.org > > tclug-list at mn-linux.org > > https://mailman.mn-linux.org/mailman/listinfo/tclug-list > > > > _______________________________________________ > Twin Cities Linux Users Group Mailing List - Minneapolis/St. Paul, Minnesota > http://www.mn-linux.org > tclug-list at mn-linux.org > https://mailman.mn-linux.org/mailman/listinfo/tclug-list > _______________________________________________ > Twin Cities Linux Users Group Mailing List - Minneapolis/St. Paul, Minnesota > http://www.mn-linux.org > tclug-list at mn-linux.org > https://mailman.mn-linux.org/mailman/listinfo/tclug-list >