Ever play pool/billards ?? Missed a corner shot and watched the ball come back close to you?? The most overlooked reflection in a chamber is the corner one, probably because it makes your head hurt trying to visualize it. ps. the three sided corner is called a retro-reflector and there are 8 in the chamber. It is commonly used to as a radar target for ranging and identifying boats and other objects. And found in every light reflector on cars and road markers. By corner I mean both the three and two sided corners where the various walls meet. So treat the corners with special care - load them up. Remember, you heard it here first. - Bill
[email protected] wrote: Hello, I'm trying to qualify my 3 meter chamber for field uniformity at 10 V/m and could use some help. I was able to get 18V/m at all 16 points of the grid (only need 12) with the antenna in the vertical position, but couldn't do it when the antenna was switched to the horizontal position. I moved the floor patch all over the chamber, moved the antenna and probe to different areas, but still haven't found just the right combination. Here are the some of the details: Problem frequency: It shifts but typically 80MHz and above 650 MHz It seems we can correct one but not both. Chamber dimension: 16' x 24' x 10' Lining: Mix of ferrite tile and 24" cones Placement of lining: 14' x 10' ferrite tile patch centered on each side wall 10' x 10' ferrite tile patch on wall behind isotropic probe (EUT end) 8' x 14' ferrite tile patch on ceiling 24" cones on wall behind antenna Mostly 24" cones, but some ferrite tile in all remaining wall surfaces. Floor Patch: Thirty 2' x 2' ferrite tiles shuffled in countless configurations. Test Distance: 2.5 meters (It failed at 3 meters so I moved the antenna in to 2.5. It passed with the antenna in the vertical position, but failed in horizontal position.) Amplifier: 100W amplifier outside the chamber Floor patch: Thirty 2' x 2' ferrite tiles Thanks! Ken _____ AOL now offers free email to everyone. Find out more about what's free from AOL at <http://pr.atwola.com/promoclk/ 615326657x4311227241x4298082137/aol?redir=http://www.aol.com> AOL.com. - ---------------------------------------------------------------- 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 _____ Don't get soaked. Take a quick peek at the forecast <http://tools.search.yahoo.com/shortcuts/?fr=oni_on_mail&#news> with theYahoo! Search weather shortcut. <http://tools.search.yahoo.com/shortcuts/?fr=oni_on_mail&#news> - ---------------------------------------------------------------- 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 email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
