Return-Path: Received: from mtain-df07.r1000.mx.aol.com (mtain-df07.r1000.mx.aol.com [172.29.64.219]) by air-dd01.mail.aol.com (v129.4) with ESMTP id MAILINDD013-86574ce80cf2173; Sat, 20 Nov 2010 13:01:22 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df07.r1000.mx.aol.com (Internet Inbound) with ESMTP id BE87F38000115; Sat, 20 Nov 2010 13:01:20 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PJria-0001Lc-57 for rs_out_1@blacksheep.org; Sat, 20 Nov 2010 17:59:20 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PJriZ-0001LT-N7 for rsgb_lf_group@blacksheep.org; Sat, 20 Nov 2010 17:59:19 +0000 Received: from imr-da01.mx.aol.com ([205.188.105.143]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PJriW-00019r-RR for rsgb_lf_group@blacksheep.org; Sat, 20 Nov 2010 17:59:19 +0000 Received: from mtaout-db03.r1000.mx.aol.com (mtaout-db03.r1000.mx.aol.com [172.29.51.195]) by imr-da01.mx.aol.com (8.14.1/8.14.1) with ESMTP id oAKHxAvM027044; Sat, 20 Nov 2010 12:59:10 -0500 Received: from White (unknown [212.23.103.25]) by mtaout-db03.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 93106E0000A2; Sat, 20 Nov 2010 12:59:08 -0500 (EST) Message-ID: <09E199CD1E46424386AADFE92A673B65@White> From: "Markus Vester" To: Cc: "henny van elst" Date: Sat, 20 Nov 2010 18:59:28 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 X-Spam-Score: 1.3 (+) X-Spam-Report: autolearn=disabled,RCVD_IN_BL_SPAMCOP_NET=1.332 Subject: VLF: coil diameter Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d40db4ce80cf02a30 X-AOL-IP: 195.171.43.25 Dear Henny, the coil consists of seven ordinary ten-liter polypropylene household buckets, inserted upside-down into one another. The diameter of the buckets is about 25 cm at the bottom and 21 cm near the top. Each bucket carries 460 turns of 0.4 mm enameled wire. The lead from the top end of one winding to th bottom end of the next has to run alomg the winding, and is insulated with several strips of tape an foam material. Total DC resistance is about 320 ohms. The resonance is adjusted by the amount of overlap. Inserting the buckets deeper into one another lowers the frequency by enhancing the mutual inductive coupling, along with a slightly higher inter-layer capacitance. My 240 pF antenna requires a total length of about 60 cm for 9 kHz. For the 500 pF kite antenna I need only five buckets, and with larger spacing. Best 73, Markus (DF6NM) From: henny van elst Sent: Wednesday, November 17, 2010 6:43 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: XDV QRSS60 137k Hello Marcus, I am also busy with an coil for 8,970Khz,can You tel me the diameter of the coil on the roof? henny cpm best 73's