Return-Path: Received: (qmail 20490 invoked from network); 25 Sep 2001 17:49:34 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 25 Sep 2001 17:49:34 -0000 Received: (qmail 22579 invoked from network); 25 Sep 2001 17:49:14 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 25 Sep 2001 17:49:14 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15lwCV-0007Gs-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 25 Sep 2001 18:40:55 +0100 Received: from tungsten.btinternet.com ([194.73.73.81]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15lwCU-0007Gm-00 for rsgb_lf_group@blacksheep.org; Tue, 25 Sep 2001 18:40:54 +0100 Received: from [217.35.38.82] (helo=dellboy) by tungsten.btinternet.com with smtp (Exim 3.22 #6) id 15lwBq-000432-00 for rsgb_lf_group@blacksheep.org; Tue, 25 Sep 2001 18:40:14 +0100 Message-ID: <002201c145e9$1b3d8e40$1700a8c0@home> From: "Dave Pick" To: "LF Group" Subject: LF: Doppler effect. Date: Tue, 25 Sep 2001 18:39:53 +0100 MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit

Dear all.

I have the Argo screen-shots of ZL6QH recorded in Papua New Guinea, a path of about 4,700km. This is not very different from out trans-Atlantic tests but Ricks traces show a Doppler effect around midnight which spreads the signal over about 0.1Hz, I have never seen this on a 136k trans-Atlantic trace.

Have a look at the shots on http://www.wireless.org.uk/newspic63.htm and see what you think.

Rick has calculated that the reflecting medium would have to have a velocity of around 100m/sec, assuming a double hop, to cause this kind of shift.

Any propagation brains care to speculate on the cause of this, and is there a reason why we haven't seen it on 136?

73.

Dave.

G3YXM