Return-Path: Received: from mtain-md04.r1000.mx.aol.com (mtain-md04.r1000.mx.aol.com [172.29.96.88]) by air-db08.mail.aol.com (v129.4) with ESMTP id MAILINDB084-869c4d6e382c298; Wed, 02 Mar 2011 07:29:32 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 2DEB5380003FE; Wed, 2 Mar 2011 07:29:30 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PulAF-00066F-Of for rs_out_1@blacksheep.org; Wed, 02 Mar 2011 12:28:23 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PulAE-000666-F5 for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2011 12:28:22 +0000 Received: from out1.ip03ir2.opaltelecom.net ([62.24.128.239]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PulAC-0004qx-MU for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2011 12:28:22 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: At0BAGPGbU1Ok8+p/2dsb2JhbACIZY8cP44XdL0fhWEEkAA X-IronPort-AV: E=Sophos;i="4.62,252,1297036800"; d="scan'208";a="339439849" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.207.169]) by out1.ip03ir2.opaltelecom.net with SMTP; 02 Mar 2011 12:28:14 +0000 Message-ID: <001301cbd8d5$49edb560$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: Date: Wed, 2 Mar 2011 12:28:08 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: WRC-2012 proposal for 'near' 500kHz band(s) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit 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: 3039ac1d60584d6e382a2c29 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none David Good point, also my VFO does not go down that far. g3kev ----- Original Message ----- From: "David Pratt" To: Sent: Wednesday, March 02, 2011 11:17 AM Subject: LF: WRC-2012 proposal for 'near' 500kHz band(s) > 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 | > + - - - - - - - - - - - - - - - - + > > > >