Oooops, my reply was really relevant to Compact PCI panels, not PCI. Sorry, I just realized it.
I haven't worked on designs using PCI brackets for EMC. I believe that former Instrument Specielties, now part of Laird Technologies, can help you. They are very knowledgeable in the area of shielding/gasketing, one of the best resources, and have many products for that. Neven > > Yup, we had the same problem on a GNIC card. We made the card and its > L-shaped bracket. The card was intended for any ol' computer. The casual > contact > between the face of the bracket and the PC chassis was "iffy" at best. I put > a > couple of small dimples (punched slots really), on the long sides of the > bracket. They were on both sides of the bracket and spaced equidistant from > the > top and bottom of the opening in the PC's card mounting bracket. The dimples > made contact just before the end of the GNIC bracket aligned with the screw > hole > in the PC mounting bracket. This gave me enough force to make electrical > grounding contact, and effectively cut the card opening size by 1/3. Yes, it > does leave small slots between dimples, but these slots are significantly > smaller than the slots that are left unintentionally between the card and the > PC > mounting bracket. The GNIC, at the time, had a very noisy 1 X 9 laser > transceiver running at 1.25 GHz and this resolved my problem. The arrang! > ement ended up being tested multiple times because of changes in > transceivers, > and other circuit changes but I never had any more problems with the fit. > > Gary > > -----Original Message----- > From: rbus...@es.com [mailto:rbus...@es.com] > Sent: Friday, August 30, 2002 7:54 AM > To: emc-p...@majordomo.ieee.org > Subject: PCI Brackets Problems > > > > I am fighting the age old problem of PCI brackets on various PC chassis not > making adequate electrical contact. Aperture leaks, especially at high > frequencies, is a continual problem, to say nothing about the flimsy > construction of the brackets. Has anyone had any success with the clips, > gaskets > and other EMI solutions? If you have any suggestions on types, or > manufacturers > please let me know. > > Thanks in advance... > > Rick Busche > Evans & Sutherland > rbus...@es.com > > ------------------------------------------- > 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: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > 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: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" > > ------------------------------------------- > 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: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > 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: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
