Beware that stainless steel has high impedance in GHz range, about 50 times higher than copper. That seriously degrades performance at high frequencies relative to BeCu or other good conductors.
Neven > > Rick, > > Chomerics' Springline product line is an off-the-shelf solution: > > http://www.chomerics.com/products/cardcage.htm > > The spring-fingers on these one-piece gaskets are formed > toward the rear panel instead of toward the inside, where > damage due to snagging can be a problem. > > The only negative comment I have about this product concerns > the stainless steel material. In my experience, mixing stainless steel > and cold-rolled steel causes corrosion, even though the CRS is Zinc-plated. > Chomerics has offered to tin-plate the SS for us. > > Over the years, the design group I'm in has tried various > custom gaskets for this application--strips of tin-plated Be/Cu > or Phosphor-Bronze spring fingers between the PCI brackets > or fabric-over-foam gaskets, both of which have their > challenges. It seems we've come full-circle and have settled > on the above off-the-shelf solution. > > Good Luck, > Dan > > > X-MimeOLE: Produced By Microsoft Exchange V6.0.5762.3 > > content-class: urn:content-classes:message > > MIME-Version: 1.0 > > Subject: PCI Brackets Problems > > Date: Fri, 30 Aug 2002 08:54:09 -0600 > > X-MS-Has-Attach: > > X-MS-TNEF-Correlator: > > Thread-Topic: Curious about Tripp-Lite "isolation transformer" > > Thread-Index: AcJQM3jmO5hzvAL2Sl+Op3k/hH61TAAAMcqg > > From: <[email protected]> > > To: <[email protected]> > > Content-Transfer-Encoding: 8bit > > X-MIME-Autoconverted: from quoted-printable to 8bit by ruebert.ieee.org id > g7UEsCC20318 > > X-Resent-To: Multiple Recipients <[email protected]> > > X-Listname: emc-pstc > > X-Info: Help requests to [email protected] > > X-Info: [Un]Subscribe requests to [email protected] > > X-Moderator-Address: [email protected] > > > > > > 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 > > [email protected] > > > > ------------------------------------------- > > 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: > > [email protected] > > with the single line: > > unsubscribe emc-pstc > > > > For help, send mail to the list administrators: > > Ron Pickard: [email protected] > > Dave Heald: [email protected] > > > > For policy questions, send mail to: > > Richard Nute: [email protected] > > Jim Bacher: [email protected] > > > > 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: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] 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"
