Return-Path: Received: from mtain-md02.r1000.mx.aol.com (mtain-md02.r1000.mx.aol.com [172.29.96.86]) by air-md05.mail.aol.com (v129.4) with ESMTP id MAILINMD051-8b844d6ffa332ae; Thu, 03 Mar 2011 15:29:39 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md02.r1000.mx.aol.com (Internet Inbound) with ESMTP id C53FB380000A1; Thu, 3 Mar 2011 15:29:37 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PvF8c-0007d7-5w for rs_out_1@blacksheep.org; Thu, 03 Mar 2011 20:28:42 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PvF8b-0007cy-KW for rsgb_lf_group@blacksheep.org; Thu, 03 Mar 2011 20:28:41 +0000 Received: from imr-mb01.mx.aol.com ([64.12.207.164]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PvF8Z-00047c-BP for rsgb_lf_group@blacksheep.org; Thu, 03 Mar 2011 20:28:41 +0000 Received: from mtaout-ma05.r1000.mx.aol.com (mtaout-ma05.r1000.mx.aol.com [172.29.41.5]) by imr-mb01.mx.aol.com (8.14.1/8.14.1) with ESMTP id p23KSYTq029761 for ; Thu, 3 Mar 2011 15:28:34 -0500 Received: from White (nrbg-4dbf9fac.pool.mediaWays.net [77.191.159.172]) by mtaout-ma05.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 6A08DE0000BC for ; Thu, 3 Mar 2011 15:28:31 -0500 (EST) Message-ID: <40859D2140F9450AAF36409394AC03E0@White> From: "Markus Vester" To: References: <6C9E0C3D501744C99E11539B7AFCB120@IBM7FFA209F07C> Date: Thu, 3 Mar 2011 21:28:50 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Topband Test 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=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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: 3039ac1d60564d6ffa314a33 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Chris, thanks for sharing this unusual observation. >From your screenshot, the split was up to about 0.35 Hz, or 0.2 ppm of 1.8 MHz. Interpreted as Doppler, a reflector would have to move at least 30m/s radially from your baseline. This seems a bit fast for an ionospheric day-to-night shift. Another possible explanation could be airplane scatter. Large airliners are known to have a large radar cross section at HF. Seeing that on 160 m may seem extreme, but considering the wingspan of an A-380 (80 m), half-wave resonant scattering is a very real possibility. The downward slope of the Doppler shifted frequency would also be indicative of an object passing by at constant linear velocity. Best 73, Markus (DF6NM) From: Chris Sent: Thursday, March 03, 2011 7:55 PM To: RSGB LF Group Subject: LF: Topband Test Hi All, Yesterday evening Pete, M0FMT, transmitted QRSS on topband for a test. An unexpected effect was noticed with the trace splitting in two. Nothing new or 'earth shattering' I expect, but new to us and worthy of further experimentation. See the result and conclusion on my website http://qsl.net/g4ayt on the bottom of page 1. I have never seen this effect on 137, even with quite strong audible signals, maybe others have. Vy 73, Chris, G4AYT, Whitstable, UK.