Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3A1A93800009D; Mon, 29 Oct 2012 10:52:12 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TSqgQ-00059I-Px for rs_out_1@blacksheep.org; Mon, 29 Oct 2012 14:51:18 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TSqgQ-000599-Dp for rsgb_lf_group@blacksheep.org; Mon, 29 Oct 2012 14:51:18 +0000 Received: from smtp-vbr11.xs4all.nl ([194.109.24.31]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TSqgO-0000M0-Ve for rsgb_lf_group@blacksheep.org; Mon, 29 Oct 2012 14:51:17 +0000 Received: from pc-roelof (ndb.demon.nl [82.161.81.65]) by smtp-vbr11.xs4all.nl (8.13.8/8.13.8) with ESMTP id q9TEpAWI001118 for ; Mon, 29 Oct 2012 15:51:16 +0100 (CET) (envelope-from roelof@ndb.demon.nl) To: rsgb_lf_group@blacksheep.org References: <508D47B2.8060209@iup.uni-heidelberg.de> <46A9A1D9FC954A658216B197782524BF@White> <891CD59233F844C283BAC09A2AAA04BA@White> <508D6A9D.4020600@iup.uni-heidelberg.de> <508D6C1A.7050607@iup.uni-heidelberg.de> <508D8084.6020501@freenet.de> <508D8295.8010604@broadpark.no> <508D84F0.1000706@freenet.de> <508D87C4.9030808@broadpark.no> <1351458186.87962.YahooMailNeo@web133201.mail.ir2.yahoo.com> <508DA2F3.20400@freenet.de> Date: Mon, 29 Oct 2012 15:51:08 +0100 MIME-Version: 1.0 From: "Roelof Bakker" Message-ID: In-Reply-To: <508DA2F3.20400@freenet.de> User-Agent: Opera Mail/12.02 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Wolf, This phenomenon can be observed on many NDB's. I don't think that a sophisticated modulator is used. One reason for sure is selective fading. It is not uncommon to see one sideband completely disappear whilst the other is quite strong and vice versa. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [194.109.24.31 listed in list.dnswl.org] X-Scan-Signature: 4d4a9e8f68fb15c54898568240f542c5 Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes Subject: Re: LF: DJ9!E and DF5QG CW 0n 472.5 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: 3039ac1d408f508e981c671b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello Wolf, This phenomenon can be observed on many NDB's. I don't think that a sophisticated modulator is used. One reason for sure is selective fading. It is not uncommon to see one sideband completely disappear whilst the other is quite strong and vice versa. An other possibility is the restricted bandwidth of the antenna in use. Many installations use an automatic antenna tuner, but this can get awry in the long run by worn gearboxes etc! 73, Roelof, pa0rdt