Return-Path: Received: (qmail 31924 invoked from network); 11 Mar 2003 22:12:23 -0000 Received: from netmail01.services.quay.plus.net (212.159.14.219) by mailstore with SMTP; 11 Mar 2003 22:12:23 -0000 Received: (qmail 12883 invoked by uid 10001); 11 Mar 2003 22:12:23 -0000 Received: from post.thorcom.com (193.82.116.70) by netmail01.services.quay.plus.net with SMTP; 11 Mar 2003 22:12:23 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.12) id 18sry2-0006TC-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 11 Mar 2003 22:11:26 +0000 Received: from [194.73.73.81] (helo=tungsten.btinternet.com) by post.thorcom.com with esmtp (Exim 4.12) id 18srxx-0006T3-00 for rsgb_lf_group@blacksheep.org; Tue, 11 Mar 2003 22:11:21 +0000 Received: from dial81-135-73-4.in-addr.btopenworld.com ([81.135.73.4] helo=Main) by tungsten.btinternet.com with smtp (Exim 3.22 #23) id 18srxw-0002Ub-00 for rsgb_lf_group@blacksheep.org; Tue, 11 Mar 2003 22:11:20 +0000 Message-ID: <003601c2e81b$138c0660$6507a8c0@Main> From: "Alan Melia" To: "LF-Group" Date: Tue, 11 Mar 2003 21:56:11 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: T/A timings Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.0 required=5.0tests=noneversion=2.50 X-Spam-Checker-Version: SpamAssassin 2.50 (1.173-2003-02-20-exp) X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hi all, Thanks for the screen grabs Mitch. They are very interesting. You will note that Steve's DCF plot slowed a slow climb to a single peak at about 0200z. Then Steve shows a steady decline. I think there may be more "hops" in the DCF path so that there is more absorption. Another interesting point is that the "fade-out" at about 0745 is the time where the daylight edge is about 25% of the way across the pond. This means that the D-layer at the path central point is just beginning to be illuminated. I notice also that there is a fade just before that. The falling edge of the earlier fade would be as the daylight edge reaches Porto and the D-layer would be illuminater to about the 25% point...starting to kill the "first bounce" of the 2 hop signal. As the D-layer over the central Atlantic is illuminated the "1-hop" signal would be wiped out. Well that is my explanation, it may not be correct......but its a good hypothesis to throw up and let it be "shot at". Good Hunting Cheers de Alan G3NYK alan.melia@btinternet.com .