Return-Path: Received: from mtain-mi04.r1000.mx.aol.com (mtain-mi04.r1000.mail.aol.com [172.21.131.162]) by air-dc08.mail.aol.com (v128.1) with ESMTP id MAILINDC084-86a64bc6bf7d33d; Thu, 15 Apr 2010 03:25:49 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mi04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5F21F380000A7; Thu, 15 Apr 2010 03:25:47 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O2JQb-0007Lm-2D for rs_out_1@blacksheep.org; Thu, 15 Apr 2010 08:23:57 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O2JQa-0007Ld-Fu for rsgb_lf_group@blacksheep.org; Thu, 15 Apr 2010 08:23:56 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O2JQZ-0005uu-5Q for rsgb_lf_group@blacksheep.org; Thu, 15 Apr 2010 08:23:56 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id o3F7NlG3025154 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 15 Apr 2010 09:23:47 +0200 Received: from [129.206.29.99] (pc99.iup.uni-heidelberg.de [129.206.29.99]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id o3F7NpAo010947 for ; Thu, 15 Apr 2010 09:23:53 +0200 Message-ID: <4BC6BF82.6000902@iup.uni-heidelberg.de> Date: Thu, 15 Apr 2010 09:25:54 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <000c01cadbca$b43bdfe0$6d01a8c0@DELL4> In-Reply-To: <000c01cadbca$b43bdfe0$6d01a8c0@DELL4> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: VLF...alpha long selective fade? 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 x-aol-global-disposition: G x-aol-sid: 3039400cdecc4bc6bf7b297e X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hi Jay, Others (than me) may answer your question better. I just want to say that i am happy that you improve your VLF RX :-) Maybe today or tomorrow i will set up my new VLF Grabber here in Heidelberg. The system already works on my PC, just the connection to the server has to be done :-) I use a narrow band filter arround 9kHz. The ALPHA beacon @ 11,904762 is attenuated arround 40dB! But the SNR is still about 10dB so the (E-field) antenna seems to work very good here at this QTH. So, i could add a ALPHA screen as well, to study these effects... Best 73 and hpe you see me on VLF one day ;-) Stefan/DK7FC Am 14.04.2010 14:04, schrieb jrusgrove@comcast.net: > Been monitoring / plotting the alpha stations over the past couple > weeks while working to improve the VLF receiving setup. The following > very slow 'selective fade' has been seen every night that I've looked > (4 times) so it's not a one off occurrence. Anyone care to speculate > on what would cause this? > > Full screen here: http://www.w1vd.com/capture/alphafade1.jpg . > Condensed version as an attachment. > > Jay W1VD WD2XNS WE2XGR/2