Return-Path: Received: from mtain-da06.r1000.mx.aol.com (mtain-da06.r1000.mx.aol.com [172.29.64.78]) by air-da10.mail.aol.com (v129.4) with ESMTP id MAILINDA103-86424d6e2787234; Wed, 02 Mar 2011 06:18:31 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da06.r1000.mx.aol.com (Internet Inbound) with ESMTP id C827B3800040C; Wed, 2 Mar 2011 06:18:29 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Puk3l-0005mN-8Q for rs_out_1@blacksheep.org; Wed, 02 Mar 2011 11:17:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Puk3k-0005mE-Sp for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2011 11:17:36 +0000 Received: from smtp6.freeserve.com ([193.252.22.190]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Puk3i-0003cu-9I for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2011 11:17:36 +0000 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3629.me.freeserve.com (SMTP Server) with ESMTP id 8DEB3700009C for ; Wed, 2 Mar 2011 12:17:28 +0100 (CET) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3629.me.freeserve.com (SMTP Server) with ESMTP id 81DD3700009D for ; Wed, 2 Mar 2011 12:17:28 +0100 (CET) Received: from g4dmp.fsnet.co.uk (unknown [91.107.139.239]) by mwinf3629.me.freeserve.com (SMTP Server) with ESMTP id 527EA700009C for ; Wed, 2 Mar 2011 12:17:28 +0100 (CET) X-ME-UUID: 20110302111728338.527EA700009C@mwinf3629.me.freeserve.com Message-ID: Date: Wed, 2 Mar 2011 11:17:21 +0000 To: rsgb_lf_group@blacksheep.org From: David Pratt MIME-Version: 1.0 User-Agent: Turnpike/6.07-M () X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: 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: 3039ac1d404e4d6e27854786 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) I was somewhat disturbed by the piece in last Sunday's GB2RS news that gave preliminary information about the proposals to WRC-2012 for an allocation near to 500kHz. It states that the initial proposal for 15kHz allocated was between 415 to 526.5kHz. Due to future maritime use, the RSGB is proposing 472-487kHz, while the US will be proposing two bands totally 15kHz, viz 461-469 and 471-478kHz. I wonder whether any thought has been given to the fact that the IF of medium wave broadcast receivers in the UK is usually either 465kHz or 470kHz? In the US the IF is more usually 450kHz or 455kHz. This being so, any operating particularly at the lower end of 472-487kHz is very likely to cause interference to AM broadcast reception. I recall when I took my Morse test at Portpatrick in 1954. Broadcast reception was repeatedly interrupted by GPK operating on 472kHz. Sorry it this has been covered before. I could have missed it. 73 de David G4DMP -- + - - - - - - - - - - - - - - - - + | David M Pratt, Kippax, Leeds. | | Website: http://www.g4dmp.co.uk | + - - - - - - - - - - - - - - - - +