Return-Path: Received: (qmail 557 invoked from network); 3 Apr 2002 17:15:50 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 3 Apr 2002 17:15:50 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 17689 invoked from network); 3 Apr 2002 17:15:48 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 3 Apr 2002 17:15:48 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16spkj-000756-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 03 Apr 2002 19:45:01 +0100 Received: from mail4.messagelabs.com ([212.125.75.12]) by post.thorcom.com with smtp (Exim 3.33 #2) id 16spki-000751-00 for rsgb_lf_group@blacksheep.org; Wed, 03 Apr 2002 19:45:00 +0100 X-VirusChecked: Checked Received: (qmail 976 invoked from network); 3 Apr 2002 17:06:13 -0000 Received: from merimac.us.gases.boc.com (HELO merimac) (204.149.80.4) by server-13.tower-4.messagelabs.com with SMTP; 3 Apr 2002 17:06:13 -0000 Received: by EXC_WIL04 with Internet Mail Service (5.5.2653.19) id <2G9P4BQV>; Wed, 3 Apr 2002 12:13:40 -0500 Message-ID: From: "Ashlock,William" To: rsgb_lf_group@blacksheep.org Subject: LF: RE: more loop inductance Date: Wed, 3 Apr 2002 11:57:05 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Rik, >Does anyone have actualy measured the inductance of a big square loop ? >I would be interested to check the measured values against the calculated >ones. At my std 50ft x 50ft location, a #12 (2mm) conductor measured ~109uh. Your L=.2W((ln(W/d)+5.5) formula yields 106uh. I suspect the loop may have been a bit longer than 200ft, so the formula could have been right on the money. My new 0.63"d pipe loop at this same location measures 90uh and calculates to be ~82uh using this formula. The reason for most of the discrepancy must be that the formula is for solid or stranded conductors - but sill not that far off. Bill A ********************************************************************* This footnote confirms that this e-mail message has been scanned for the presence of known computer viruses by the MessageLabs Virus Control Centre. However, it is still recommended that you use local virus scanning software to monitor for the presence of viruses. *********************************************************************