Return-Path: Received: (qmail 1079 invoked from network); 6 Feb 2003 16:15:12 -0000 Received: from netmail02.services.quay.plus.net (212.159.14.221) by mailstore with SMTP; 6 Feb 2003 16:15:12 -0000 Received: (qmail 15438 invoked by uid 10001); 6 Feb 2003 16:15:12 -0000 Received: from post.thorcom.com (193.82.116.70) by netmail02.services.quay.plus.net with SMTP; 6 Feb 2003 16:15:12 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.12) id 18gofI-00056u-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 06 Feb 2003 16:14:16 +0000 Received: from [212.159.14.223] (helo=marstons.services.quay.plus.net) by post.thorcom.com with smtp (Exim 4.12) id 18gofH-00056l-00 for rsgb_lf_group@blacksheep.org; Thu, 06 Feb 2003 16:14:16 +0000 Received: (qmail 22568 invoked by uid 10001); 6 Feb 2003 16:13:42 -0000 Received: from ctuash.sonnetinternet.co.uk (HELO hugh) (212.159.90.113) by marstons.services.quay.plus.net with SMTP; 6 Feb 2003 16:13:42 -0000 Message-ID: <001501c2cdfa$a0a3c280$0504210a@c.scope> From: "Hugh M0WYE" To: rsgb_lf_group@blacksheep.org References: <000c01c2cdf3$20d54530$ee9bfea9@oben> <006e01c2cdf7$3c0e1fd0$1b00a8c0@dellboy> Date: Thu, 6 Feb 2003 16:12:47 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Re: "Decca-type" coils Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=-0.3 required=6.0tests=QUOTED_EMAIL_TEXT,REFERENCES,SPAM_PHRASE_00_01, USER_AGENT_OEversion=2.43 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hi Peter > Hello lf-group, > is there any formula to calculate a loading-coil like the Decca-type? > Abt 3 mH might be required. By "Decca-type" I presume you mean "basket weave" Alan Melia has pictures and some design info for a home made basket weave coil of 2.3mH and another of 9mH at http://www.alan.melia.btinternet.co.uk/lfaecoil.htm#LF%20Aerials%20and%20Loa ding%20coils I find coil equations rarely give an accurate value of mH, I prefer to wind some turns and measure the resonant frequency with a capacitor of known value. Then add or subtract turns until the desired value is obtained. Hugh M0WYE