Return-Path: Received: from mtain-dj03.r1000.mx.aol.com (mtain-dj03.r1000.mail.aol.com [172.19.187.139]) by air-ma01.mail.aol.com (v129.4) with ESMTP id MAILINMA013-b4f14cddbef6176; Fri, 12 Nov 2010 17:25:58 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dj03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1DE943800016E; Fri, 12 Nov 2010 17:25:56 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PH22d-0001k9-62 for rs_out_1@blacksheep.org; Fri, 12 Nov 2010 22:24:19 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PH22c-0001k0-MV for rsgb_lf_group@blacksheep.org; Fri, 12 Nov 2010 22:24:18 +0000 Received: from warsl404pip1.highway.telekom.at ([195.3.96.112] helo=email.aon.at) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PH22a-0003E7-GX for rsgb_lf_group@blacksheep.org; Fri, 12 Nov 2010 22:24:18 +0000 Received: (qmail 22510 invoked from network); 12 Nov 2010 22:24:09 -0000 Received: from 91-115-31-145.adsl.highway.telekom.at (HELO [192.168.1.101]) ([91.115.31.145]) (envelope-sender ) by smarthub93.highway.telekom.at (qmail-ldap-1.03) with SMTP for ; 12 Nov 2010 22:24:09 -0000 From: Gerhard Hickl To: rsgb_lf_group@blacksheep.org In-Reply-To: <000f01cb82b7$3175c960$0301a8c0@your91hoehfy9g> References: <1289596636.2682.17.camel@gerhard-desktop> <000f01cb82b7$3175c960$0301a8c0@your91hoehfy9g> Date: Fri, 12 Nov 2010 23:24:11 +0100 Message-ID: <1289600651.3509.2.camel@gerhard-desktop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: LF Coils Content-Type: text/plain; charset="UTF-8" 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=0.0 required=5.0 tests=none 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: 3039cdbc9d074cddbef456d2 X-AOL-IP: 195.171.43.25 Hi Mal! As far as I understood it is regarding 137 (= LF) but meanwhile I'm not sure either.... 73 es looking forward to a QSO on LF! OE3GHB Gerhard Am Freitag, den 12.11.2010, 22:16 +0000 schrieb mal hamilton: > What frequency are you discussing ? > g3kev > > ----- Original Message ----- > From: "Gerhard Hickl" > To: > Sent: Friday, November 12, 2010 9:17 PM > Subject: Re: LF: LF Coils > > > > Hi Ken! > > > > It all depends on the antenna your are going to feed with this loading > > coil. My system has a capacitive load of abt. 600pf and so the coil is > > abt. 2,3mH. This is realized on a flower pot with about 40cm diameter, > > 80 turns of insulated wire. The height of the pot is only 30cm. > > > > If you have a smaller capacitive load, you'll need more inductance and > > thus increasing the diameter of the coil-body. > > > > If you count 6pf per meter for every vertical part of your antenna and > > 5pf/m for every horizontal part, you can estimate the capacitive load > > very well. For calculation of L and C for a given frequency or for > > dimensioning air-coils (Luftspulen), I can recommend the > > "Mini-Ringkernrechner"... > > > > http://www.dl5swb.de/html/mini_ringkern-rechner.htm > > > > I don't remember if there's an option for the language on installation > > but even if it's only in German, it easy to operate. > > > > 73 > > > > OE3GHB > > Gerhard > > > > > > > > > > > > Am Donnerstag, den 11.11.2010, 20:28 +0000 schrieb Ken: > > > Hello Everyone. > > > I went into a branch of Wilkinsons (Watford), today, and saw some > > > straight sided cylindrical dust bins about 0.5m diameter, useful for > > > large coils? > > > > > > 73 > > > Ken > > > M0KHW IO91TV > > > > > > >