Return-Path: Received: (qmail 21325 invoked from network); 30 Mar 2002 18:41:15 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by exhibition.plus.net with SMTP; 30 Mar 2002 18:41:15 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 26639 invoked from network); 30 Mar 2002 18:40:58 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 30 Mar 2002 18:40:58 -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 16rPFt-0004Sr-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 30 Mar 2002 20:15:17 +0000 Received: from mail4.messagelabs.com ([212.125.75.12]) by post.thorcom.com with smtp (Exim 3.33 #2) id 16rPFs-0004Sl-00 for rsgb_lf_group@blacksheep.org; Sat, 30 Mar 2002 20:15:16 +0000 X-VirusChecked: Checked Received: (qmail 1755 invoked from network); 30 Mar 2002 18:37:05 -0000 Received: from merimac.us.gases.boc.com (HELO merimac) (204.149.80.4) by server-12.tower-4.messagelabs.com with SMTP; 30 Mar 2002 18:37:05 -0000 Received: by EXC_WIL04 with Internet Mail Service (5.5.2653.19) id ; Sat, 30 Mar 2002 13:44:37 -0500 Message-ID: From: "Ashlock,William" To: "'Alexander S. Yurkov'" Cc: rsgb_lf_group@blacksheep.org Subject: LF: RE: loop inductance Date: Sat, 30 Mar 2002 13:28:10 -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: Hi Alex, Here goes: L(uh) = .008s((ln(1.414s/2d)+.38) Where s = the length of a side in cm; d = diameter of conductor in cm; ln = natural logarithm This is for a single turn square loop. With the final (insignificant) term removed, that isn't so hairy after all! Bill A -----Original Message----- From: Alexander S. Yurkov [mailto:fitec@omskcity.com] Sent: Saturday, March 30, 2002 10:42 AM To: Ashlock,William Subject: loop inductance Hi, Bill. On Fri, 29 Mar 2002, Ashlock,William wrote: > I use the formulas for inductance found in the loop section all late > editions of the ARRL Antenna Books (too hairy to show here; the formula > ), and it IS in cm. The accuracy is fairly close to my measured values. > For example, I calculate 109uh for a #12 (2mm) square loop having 50'x 50' > dimensions. The third term in the formulas will turn out to be insignificant > for loops this big. Unfortunely I have not such a book. Would you sent me this formula? 73 de RA9MB/Alex http://www.qsl.net/ra9mb ********************************************************************* 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. ********************************************************************* ********************************************************************* 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. *********************************************************************