Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 91BF73800008E; Mon, 11 Jul 2011 10:04:11 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QgH42-0006Px-Io for rs_out_1@blacksheep.org; Mon, 11 Jul 2011 15:02:22 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QgH42-0006Po-0Z for rsgb_lf_group@blacksheep.org; Mon, 11 Jul 2011 15:02:22 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QgH40-0005Ml-Ih for rsgb_lf_group@blacksheep.org; Mon, 11 Jul 2011 15:02:21 +0100 Received: from ix.urz.uni-heidelberg.de (cyrus-portal.urz.uni-heidelberg.de [129.206.100.176]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id p6BE2J6B008660 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 11 Jul 2011 16:02:19 +0200 Received: from extmail.urz.uni-heidelberg.de (extmail.urz.uni-heidelberg.de [129.206.100.140]) by ix.urz.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id p6BE2I6Y031481 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 11 Jul 2011 16:02:19 +0200 Received: from [129.206.205.84] (vpn205-084.rzuser.uni-heidelberg.de [129.206.205.84]) by extmail.urz.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id p6BE2G36014162 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 11 Jul 2011 16:02:18 +0200 Message-ID: <4E1B0269.2060103@iup.uni-heidelberg.de> Date: Mon, 11 Jul 2011 16:02:17 +0200 From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.11) Gecko/20100711 Thunderbird/3.0.6 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: VLF: 3 and 1.3 kHz at VE7TIL Content-Type: text/plain; charset=ISO-8859-15; 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-SCOLL-SCORE: 0:2:214954176:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1dc1474e1b02db5566 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Scott, VLF, Scott, i just took a look on your VLF grabber and saw the sferics are interestingly (clear!) attenuated in the range of 1.3 and 3 Khz. There is a sharp limit where the sferics are not visible. Is there a man made reason or is it due to a natural effect? Most people have strong QRM/hum on that QRG... 73, Stefan/DK7FC