Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Sat, 29 Jan 2005 23:41:21 -0500 Message-ID: X-Original-Return-Path: Received: from mail.indian-creek.net ([209.176.40.9] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 650064 for lml@lancaironline.net; Sat, 29 Jan 2005 09:38:49 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.176.40.9; envelope-from=toucan@78055.com Received: from VAIO (*authenticated* [209.176.40.43] toucan@78055.com) by mail.indian-creek.net with SMTP (IOA-IPAD 4.10a/96) id 9C6N000 for ; Sat, 29 Jan 2005 08:38:15 -0600 X-Original-Message-ID: <005c01c50610$2733b270$2b28b0d1@VAIO> From: "Jim Cameron" X-Original-To: "Lancair Mailing List" Subject: Grounding shields X-Original-Date: Sat, 29 Jan 2005 08:38:08 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0059_01C505DD.DBC9E480" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_0059_01C505DD.DBC9E480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable First of all, you ought to realize that grounding, shielding, and = electronic noise control is one of the foggiest, most complex, and least = understood areas of circuit design. There are lots of books on the = subject, but without an extensive background in electrical engineering = and calculus, there isn't much take-home information in them. Generally, however, best practice is to ground a shield at only one = end. Grounding both ends just invites ground loop formation and = subsequent noise generation. I've always grounded at only one end, = generally either the signal source, or the closest end to the ground = bus. It has worked for me. I think you have to assume that whoever = wrote the installation manuals that say ground both ends doesn't = understand grounding practice. Jim Cameron ------=_NextPart_000_0059_01C505DD.DBC9E480 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

First of all, you = ought to=20 realize that grounding, shielding, and electronic noise control is one = of the=20 foggiest, most complex, and least understood areas of circuit = design. =20 There are lots of books on the subject, but without an extensive = background in=20 electrical engineering and calculus, there isn't much take-home = information in=20 them.

Generally, however, = best=20 practice is to ground a shield at only one end. Grounding both = ends just=20 invites ground loop formation and subsequent noise generation. = I've always=20 grounded at only one end, generally either the signal source, or the = closest end=20 to the ground bus. It has worked for me. I think you have to = assume=20 that whoever wrote the installation manuals that say ground both ends = doesn't=20 understand grounding practice.

Jim Cameron

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