I have the 'dome' (well, my employer does). Actually, it is an 8 meter dia. radome, white fiberglass throughout. With door, HVAC and rotating floor that serves as ground plane. We pipe in fibre optics for PC host to EUT control from a receiver shelter located 50 meters perpendicular to the elipse. It is part of our $5M facility.
It looks like a giant golfball sitting on a large, grounded, concrete pad. -not the sort of place to be in a raging electrical storm... If we could simplify the RE emissions data collection, it would truly be a golden opportunity. Worthy of the expense to upgrade. Would this serve as a really large, spherical GTEM or more like a spherical magnetic field antenna, with the EUT on the INSIDE? Food for patents... Kyle Ehler <mailto:kyle.eh...@lsil.com> Assistant Design Engineer LSI Logic Corporation 3718 N. Rock Road U.S.A. Wichita, Kansas 67226 Ph. 316 636 8657 Fax 316 636 8889 -----Original Message----- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Wednesday, December 12, 2001 2:46 PM To: geor...@lexmark.com; Patrick Lawler Cc: EMC-PSTC Subject: RE: Enclosed OATS facilities---detour Hmmmm, This conductive layer of snow reminds me of a daydream/ thought experiment that I had for measuring emissions... What if you put a DUT inside a chamber that looked like a hemisphere. The chamber would be hollow (otherwise, how would the DUT get in). The chamber "skin" would be a sandwich with a thin layer of absorber on the inside and a good conductor (conductor 1) then a dielectric then another good conductor (conductor 2) on the outside. Why these layers? The inner layer would offer just enough attenuation to reduce reflections, while letting some energy get to the conductor 1 behind it. The conductor 1 layer would effectively be a "integrating measurement antenna" which picks up and integrates all emissions from the DUT. The dielectric layer would insulate conductor 1 from conductor 2. (maybe this layer would need to be RF absorbant as well, not sure). The conductor 2 layer would be grounded all the way around and would serve to block ambients. What would happen? Would conductor 1 capacitively couple to the DUT such that a simple swept RF voltage measurement between the DUT and conductor 1 would show the total interference produced by the DUT? Who's with me? Let's go to K-mart and get: A large dome tent. About 50 square yards of tin foil Some Tokin flexible ferrite stuff ** A DUT. An RF voltmeter/spectrum analyzer and a stub cable. ** **probably not available at K-mart...maybe Wal-Mart? Might make a fun experiment, or maybe give the neighbors the idea that you're building an escape pod to the mother ship. Any immediate pitfalls that can be foreseen by the collective gurus? Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
