Envelope-to: dave@picks.force9.co.uk Delivery-date: Thu, 05 Jan 2006 10:15:18 +0000 Received: by ptb-mxcore01.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1EuS9M-0004du-8O for dave@picks.force9.co.uk; Thu, 05 Jan 2006 10:15:18 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (PlusNet MXCore v2.00) id 1EuS9M-0004br-0H for dave@picks.force9.co.uk; Thu, 05 Jan 2006 10:15:16 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1EuS8y-0002b3-Uu for rs_out_1@blacksheep.org; Thu, 05 Jan 2006 10:14:52 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1EuS8y-0002au-E3 for rsgb_lf_group@blacksheep.org; Thu, 05 Jan 2006 10:14:52 +0000 Received: from ptb-relay02.plus.net ([212.159.14.213] helo=ptb-relay04.plus.net) by relay1.thorcom.net with esmtp (Exim 4.51) id 1EuTIM-0008M0-7B for rsgb_lf_group@blacksheep.org; Thu, 05 Jan 2006 11:28:57 +0000 Received: from [212.159.90.113] (helo=Hugh) by ptb-relay04.plus.net with smtp (Exim) id 1EuS5V-0002ow-Pv for rsgb_lf_group@blacksheep.org; Thu, 05 Jan 2006 10:11:17 +0000 Message-ID: <001301c611df$fa16b850$1f03210a@Hugh> From: "Hugh M0WYE" To: rsgb_lf_group@blacksheep.org References: <380-2200614593251613@M2W037.mail2web.com> Date: Thu, 5 Jan 2006 10:08:12 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Subject: LF: Re: ferrite rods Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit 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-PN-SpamFiltered: by PlusNet MXCore (v2.00) Hi Peter, Suggest you experiment ! Two short pieces of ferrite are never as good as one long one, as anyone who has ever fractured a rod will know. I don't know of any "magnetic glue" which will join the lines of flux together again - even tiny air gaps reduce the inductance. However, I have had some success bundling rods together - winding wire around three identical rods in parallel produced a more effective aerial than a single rod. Very similar to increasing the diameter of a loop antenna. 73 Hugh M0WYE ----- Original Message ----- From: To: Sent: Thursday, January 05, 2006 9:32 AM Subject: LF: ferrite rods I have a pile of ferrite rods that I have rescued from radios over the years. I have been thinking about trying to make them into one larger antenna rod for receiving only. Would I get any advantage over a normal short single rod, or do the advantages from one aspect get cancelled out by other aspects. I'm sure this must have been tried out before any advice would be appreciated. If I was to put them into an overlapping bundle should the separate bars be a)in physical contact with each other b) completely isolated from each other c) if glued together is there a specific "glue" that should be used happy new year to all on list regards peter G8AFN -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .