Ed, In the test setup 5.17.3.3 paragraph c (1) it states the ferrite should be placed near the center of the coax cable.
David Gray TUV America From: Price, Edward [mailto:[email protected]] Sent: Wednesday, July 29, 2009 8:44 AM To: [email protected] Subject: Re: [PSES] Mil-Std-461F 41" rod Ferrite & Cable query? Ken: I don't see any reference in 461 to the height of the ferrite above the enclosure floor. Are you free to put the ferrite anywhere between zero and 120 cm above the floor, or is there some "sweet spot" height that is preferred? If so, then why? Ed Price [email protected] <blocked::mailto:[email protected]> WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Ken Javor Sent: Wednesday, July 29, 2009 7:21 AM To: Untitled Subject: Re: Mil-Std-461F 41" rod Ferrite & Cable query? “In addition, Figure RE102-6 is revised to show the antenna lowered so that the center point of the 41” rod element is 120 cm above the test chamber floor. Further, this figure shows that the coaxial cable emanating from the rod antenna base is carried directly to the floor and grounded there, with a ferrite bead installed between the rod base and the floor ground point. The ferrite bead should have between 20 – 30 Ohms impedance at 20 MHz. A bead that works in this application is the Ferrishield B1642.” From an article in Conformity magazine that describe the –461F changes, January 2008. Ken Javor Phone: (256) 650-5261 - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
