Return-Path: Received: from rly-de06.mx.aol.com (rly-de06.mail.aol.com [172.19.170.142]) by air-de01.mail.aol.com (v121_r5.5) with ESMTP id MAILINDE011-4e54957b89386; Sun, 28 Dec 2008 12:34:21 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-de06.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDE068-4e54957b89386; Sun, 28 Dec 2008 12:34:13 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LGzWk-00039S-Ds for rs_out_1@blacksheep.org; Sun, 28 Dec 2008 17:34:10 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LGzWk-00039I-0s for rsgb_lf_group@blacksheep.org; Sun, 28 Dec 2008 17:34:10 +0000 Received: from smtp817.mail.ird.yahoo.com ([77.238.189.17]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1LGzWj-0007OS-Bf for rsgb_lf_group@blacksheep.org; Sun, 28 Dec 2008 17:34:09 +0000 Received: (qmail 60982 invoked from network); 28 Dec 2008 17:34:04 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:In-Reply-To:Importance; b=pAn32zapEZ+SwSmPnLrrShVHtjom7NOaDusaVFonzFsvO8Hgts9yfx864kEbEK8d/HDM0Qdg1kqpXiUofZF1jgM0NI0hf3+sT6HRLwpi1fDOBTEsG11RSiU42x2Ed1Q7TpyCBZgzEdrm110yWKuoXFDs16mltR+XYQqfNKec7S4= ; Received: from unknown (HELO aquarids) (ganymede444@86.134.204.175 with login) by smtp817.mail.ird.yahoo.com with SMTP; 28 Dec 2008 17:34:03 -0000 X-YMail-OSG: W2IY0fwVM1lC9wEar1ESfgYTpZb0FRyU.iQ_uoAVa6HIyJC6hZ5KhhifBxzXRPr.cvqxAYYQ5jtBtMmkQVb4PnEk8GpG4UPykN8RD6EfLrikQUefT4P2FYtv_OHvMnhd3oBpYl9GUeERSrArp4pwu9WWNOcr8ayKIl2d3WJxq9RvK0TcCEG5HlxK9zmI3KWYU28dY7uDVDB1na1cCJYbg.UsdH2ooRNXx7plG3ySultRABRnXOK4.bqq5i.eOO4- X-Yahoo-Newman-Property: ymail-3 From: "Dave G3WCB" To: Date: Sun, 28 Dec 2008 17:35:40 -0000 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1914 In-Reply-To: <000501c96910$9d6f9aa0$4201a8c0@home> Importance: Normal DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: RE: LF: 500KHz QSB 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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-IP: 193.82.116.20 How about QRSS on three closely spaced frequencies at once, perhaps? 73, Dave G3WCB -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of James Moritz Sent: 28 December 2008 17:21 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: 500KHz QSB Dear Gary, LF Group, Quoting from the Propagation chapter of the Admiralty Handbook of Wireless Telegraphy 1938 edition: "It is usually observed that the different frequency components of a modulated wave fade in a manner which is independent of each other. This has been termed "selective fading"... ...The use of ICW ["interrupted continuous wave" i.e. modulated CW as with the NDBs] at H/F is therefore a means of combating fading in telegraphic work." So the idea of increasing the signal bandwidth to combat selective fading is not entirely new... MCW beacons anyone? Cheers, Jim Moritz 73 de M0BMU