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
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