Return-Path: Received: from mtain-mp04.r1000.mx.aol.com (mtain-mp04.r1000.mx.aol.com [172.29.193.72]) by air-mb02.mail.aol.com (v129.4) with ESMTP id MAILINMB024-a1924d6e78e0151; Wed, 02 Mar 2011 12:05:36 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp04.r1000.mx.aol.com (Internet Inbound) with ESMTP id E5B09380006B4; Wed, 2 Mar 2011 12:05:28 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PupTO-0007zK-C9 for rs_out_1@blacksheep.org; Wed, 02 Mar 2011 17:04:26 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PupTN-0007zB-Ta for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2011 17:04:25 +0000 Received: from smtp5.freeserve.com ([193.252.22.151] helo=smtp6.freeserve.com) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PupTL-0001JD-4w for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2011 17:04:25 +0000 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3527.me.freeserve.com (SMTP Server) with ESMTP id 54D631C000B8 for ; Wed, 2 Mar 2011 18:04:17 +0100 (CET) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3527.me.freeserve.com (SMTP Server) with ESMTP id 456011C000BB for ; Wed, 2 Mar 2011 18:04:17 +0100 (CET) Received: from g4dmp.fsnet.co.uk (unknown [91.107.139.239]) by mwinf3527.me.freeserve.com (SMTP Server) with ESMTP id 089901C000B8 for ; Wed, 2 Mar 2011 18:04:16 +0100 (CET) X-ME-UUID: 20110302170417354.089901C000B8@mwinf3527.me.freeserve.com Message-ID: Date: Wed, 2 Mar 2011 17:04:05 +0000 To: rsgb_lf_group@blacksheep.org From: David Pratt References: <80823E80F3B94DCEB2B95EA9A57C72C4@JimPC> In-Reply-To: <80823E80F3B94DCEB2B95EA9A57C72C4@JimPC> MIME-Version: 1.0 User-Agent: Turnpike/6.07-M () X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: WRC-2012 proposal for 'near' 500kHz band(s) Content-Type: text/plain;charset=us-ascii 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: 3039ac1dc1484d6e78d65106 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : temperror X-Mailer: Unknown (No Version) Many thanks for your comments, Jim, and for the detailed background explanation. I just felt we should be aware of possible potential problems. There could be many AM radios (or wirelesses!) still around using old technology. 73 de David G4DMP In a recent message, James Moritz writes >Having poked around inside quite a few radios over the years, I think >465/470kHz IFs were common in the days of discrete transistors and >tuned IF transformers, but are mostly ancient history now. -- + - - - - - - - - - - - - - - - - + | David M Pratt, Kippax, Leeds. | | Website: http://www.g4dmp.co.uk | + - - - - - - - - - - - - - - - - +