X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m15.mx.aol.com ([64.12.138.205] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 951131 for flyrotary@lancaironline.net; Fri, 20 May 2005 12:56:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.205; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m15.mx.aol.com (mail_out_v38_r1.7.) id q.1c2.2905c9a5 (3988) for ; Fri, 20 May 2005 12:55:19 -0400 (EDT) From: WRJJRS@aol.com Message-ID: <1c2.2905c9a5.2fbf7076@aol.com> Date: Fri, 20 May 2005 12:55:18 EDT Subject: Re: [FlyRotary] Shielded wires To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1116608118" X-Mailer: 9.0 SE for Windows sub 5012 -------------------------------1116608118 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en =20 In a message dated 5/20/2005 9:06:24 AM Pacific Standard Time, =20 ALVentures@cox.net writes: Joe;=20 Best practice is to ground wire shield at only one end. Grounding both end= s=20 results in multiple ground paths, and the potential for =E2=80=9Cground loo= ps=E2=80=9D;=20 slight differences in ground potential. I=E2=80=99m not sure about your co= ncern about =20 the antenna effect; whatever minute signals picked up simple go to ground. Guys, I'm not an EE but I should mention (the obvious) that the INTENT of=20 the shielded wire is to absorb the signals floating around and grounding the= m =20 to prevent the inner wire from being subject to the same signals. (IE =20 functioning somewhat like an antenna) It is true that ANY high aspect ratio=20= tube can=20 become a hollow cavity antenna. I did scanning electron microscope work whe= re=20 nailing down all the potential RF sources was very important. =20 Bill Jepson -------------------------------1116608118 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
In a message dated 5/20/2005 9:06:24 AM Pacific Standard Time,=20 ALVentures@cox.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DVerdana color=3D#0000ff siz= e=3D2>

Joe;

 

Best practice= is to=20 ground wire shield at only one end.  Grounding both ends results in=20 multiple ground paths, and the potential for =E2=80=9Cground loops=E2=80= =9D; slight=20 differences in ground potential.  I=E2=80=99m not sure about your con= cern about=20 the antenna effect; whatever minute signals picked up simple go to=20 ground.

Guys, I'm not an EE but I should mention (the obvious) that the IN= TENT=20 of the shielded wire is to absorb the signals floating around and grounding=20= them=20 to prevent the inner wire from being subject to the same signals. (IE=20 functioning somewhat like an antenna) It is true that ANY high aspect ratio=20= tube=20 can become a hollow cavity antenna. I did scanning electron microscope=20= work=20 where nailing down all the potential RF sources was very=20 important.
 
Bill Jepson
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