Return-Path: Received: (qmail 21831 invoked from network); 24 Oct 2001 18:18:52 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 24 Oct 2001 18:18:52 -0000 Received: (qmail 15722 invoked from network); 24 Oct 2001 18:16:25 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 24 Oct 2001 18:16:25 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 15wSQi-00080l-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 24 Oct 2001 19:07:04 +0100 Received: from tvout.mail.uk.easynet.net ([194.6.96.5]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 15wSQg-00080f-00 for rsgb_lf_group@blacksheep.org; Wed, 24 Oct 2001 19:07:03 +0100 Received: from ericadodd (tnt-6-73.easynet.co.uk [195.40.201.73]) by tvout.mail.uk.easynet.net (Postfix) with SMTP id 6A49063067 for ; Wed, 24 Oct 2001 19:06:09 +0100 (BST) Message-ID: <002001c15cb8$64595b00$49c928c3@ericadodd> From: "g3ldo" To: rsgb_lf_group@blacksheep.org References: <15c.2dc164f.29063b17@aol.com> <000701c15b9d$28eedb60$3100a8c0@martin> Subject: LF: Re: Loading coils and shorted turns Date: Wed, 24 Oct 2001 18:59:56 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi Martin > In Peter Dodd's book LF experiments page 55 a drawing is shown of a loading > coil arrangment. The the coil inductance is adjusted by shorting turns on > the coil. Is this right? Yes. If you look at the coil design by Dick, PA0SE on the front cover of LFEH he uses taps every 10 turns at one end of the coil and a tap every single turn at the other thereby having an incremental one tap per turn for over the whole coil length. See the description of an earlier version on page 62. Dick shorts out the unused turns. Another method is to use the G3YMC coupled bucket variable coil. (I like this idea of Dave's). I have used this method using coupled bins on 73kHz. Regards, Peter, G3LDO e-mail Web