I'm going to go out on a limb here and disagree with Mr. Woodgate. Not that what he said was wrong, just overkill. If all you are worried about is conducted emissions from 150 kHz to 30 MHz, and if the AM BCB is the only licensed high power transmitter of concern (TV BCB starts at 54 MHz, and FM at 88 MHz), then all you need is some chicken wire stretched over that 2x4 frame. I wouldn't even worry about soldering or otherwise making an ohmic connection between different sections of the chicken wire, just assure yourself plenty of overlap. And make sure the door closes well and the metallic cladding goes all the way around from the outside to the edges and at least a little on the inside, and make sure the door frame is likewise coated and that coating makes a decent connection to the chicken wire. That is all you will need - no fingerstock, no gasket of any kind. AM is such a long wavelength it can't get through even the rather large chicken wire interstices of an inch or more. Ken Javor
Phone: (256) 650-5261 > From: "Gelfand, David" <[email protected]> > Date: Tue, 30 Sep 2008 09:08:19 -0400 > To: <[email protected]> > Conversation: Quiet PC for RE > Subject: Shielding setup for conducted emission prescans > > Hi all, > > I do conducted emission prescans, but do not have a shielded room. A few AM > radio stations come in loud and clear. I was considering building a wooden > frame and covering it with mesh to shield the setup. Our products are mostly > smaller than a breadbox. Any suggestions would be appreciated! > > Thanks, > > David > > > David Gelfand > Conformity Specialist > Kontron Canada Inc. > 616 Curé Boivin > Boisbriand QC > Canada J7G 2A7 > 450 437 5682 x2449 > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/request/user-guide.html > > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > > Scott Douglas [email protected] > Mike Cantwell [email protected] > > For policy questions, send mail to: > > Jim Bacher: [email protected] > David Heald: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
