Return-Path: Received: from rly-dc04.mx.aol.com (rly-dc04.mail.aol.com [172.19.136.33]) by air-dc10.mail.aol.com (v121_r4.4) with ESMTP id MAILINDC101-b1949596750124; Mon, 29 Dec 2008 19:12:05 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dc04.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDC045-b1949596750124; Mon, 29 Dec 2008 19:12:02 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LHSCk-00016g-Vk for rs_out_1@blacksheep.org; Tue, 30 Dec 2008 00:11:26 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LHSCk-00016X-Hb for rsgb_lf_group@blacksheep.org; Tue, 30 Dec 2008 00:11:26 +0000 Received: from mail.gmx.net ([213.165.64.20]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1LHSCj-0005O3-JB for rsgb_lf_group@blacksheep.org; Tue, 30 Dec 2008 00:11:26 +0000 Received: (qmail 26531 invoked by uid 0); 30 Dec 2008 00:11:19 -0000 Received: from 85.178.93.240 by www151.gmx.net with HTTP; Tue, 30 Dec 2008 01:11:19 +0100 (CET) Date: Tue, 30 Dec 2008 01:11:19 +0100 From: "Dennis" In-Reply-To: <005a01c968ff$2a99ee10$6401a8c0@asus> Message-ID: <20081230001119.6500@gmx.net> MIME-Version: 1.0 References: <005a01c968ff$2a99ee10$6401a8c0@asus> To: rsgb_lf_group@blacksheep.org X-Authenticated: #4122078 X-Flags: 0001 X-Mailer: WWW-Mail 6100 (Global Message Exchange) X-Priority: 3 X-Provags-ID: V01U2FsdGVkX18FCYl6croFCdfX5TNFP48xC3wVDgzNT2iILlsfyO BnV00WKYwNazbJ4ZsSqtN3Ihyqbp/aXtnDAA== X-GMX-UID: Rg4ser43ODB6K7SETWRM2Qw9Ji9SWpKs X-FuHaFi: 0.63 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="iso-8859-1" Subject: Re: LF: 500KHz QSB 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-IP: 193.82.116.20 Hi Gary! Yes fading seems to be very selective. Have you ever been listening to a distant AM radio station? Give it a try :) There it is often audible, that a "fading notch" travels through one sideband down to lower modulation frequencies, then there is a moment of often terribly distorted audio due to the notched out carrier (the remaining sidebands "virtually much overmodulated"), then the "notch" goes further through the second sideband (if this also passes your filter). The fading is fast on shortwave, where almost all the time different skywaves "are fighting each other" , medium fast on medium wave, and in the case of longwave transmitters sometimes very slow (may take minutes). Here in Berlin this longwave radio QSB appears very nicely at dusk to the 204km away "Polskie Radio I" 225kHz transmitter. The skywave becomes stronger and seems to equal the value of the groundwave, so constructive and destructive interference takes place. Have a nice evening :) Dennis DL6NVC -- Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger