X-GM-THRID: 1246935814503986841 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.86.2.20 with SMTP id 20cs33175fgb; Fri, 7 Sep 2007 06:27:07 -0700 (PDT) Received: by 10.66.244.20 with SMTP id r20mr1335404ugh.1189171627321; Fri, 07 Sep 2007 06:27:07 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id k30si3767212ugc.2007.09.07.06.26.58; Fri, 07 Sep 2007 06:27:07 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=193.82.116.20; Authentication-Results: mx.google.com; spf=neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ITdnL-0000Qs-5t for rs_out_1@blacksheep.org; Fri, 07 Sep 2007 14:22:47 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ITdnK-0000Qj-3J for rsgb_lf_group@blacksheep.org; Fri, 07 Sep 2007 14:22:46 +0100 Received: from smtpauth01.prod.mesa1.secureserver.net ([64.202.165.181]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1ITdnG-00044c-O8 for rsgb_lf_group@blacksheep.org; Fri, 07 Sep 2007 14:22:46 +0100 Received: (qmail 23903 invoked from network); 7 Sep 2007 13:22:23 -0000 Received: from unknown (208.37.242.34) by smtpauth01.prod.mesa1.secureserver.net (64.202.165.181) with ESMTP; 07 Sep 2007 13:22:23 -0000 Message-ID: <46E1524C.3090302@w1tag.com> Date: Fri, 07 Sep 2007 09:29:48 -0400 From: John Andrews User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <46E15ABA.6439.17F59A3@localhost> In-Reply-To: <46E15ABA.6439.17F59A3@localhost> X-Karma: 0: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: [500 - QSB Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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 Status: O X-Status: X-Keywords: X-UID: 9 Mike, I have some plots of the carrier strength of a 516 kHz aero beacon taken at a distance of 580 km. One would cover the daytime period, and the other would cover sunset until early evening. They are on my laptop at home, but I'd be happy to add titles and get them to you tonight or tomorrow. The mid-day variations were on the order of 10 dB, increasing to 20 dB as the afternoon progressed. The nighttime recording is dominated by a 45-50 dB increase in strength over the mid-day value, starting about an hour before sunset. John Andrews, W1TAG Mike Dennison wrote: > Does anyone have a spectrogram screen shot of 500kHz signals showing > the QSB period and approximate depth?