Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 4FE1538000087; Mon, 12 Mar 2012 19:27:22 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1S7Ed9-0003df-N5 for rs_out_1@blacksheep.org; Mon, 12 Mar 2012 23:26:19 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1S7Ed9-0003dW-5C for rsgb_lf_group@blacksheep.org; Mon, 12 Mar 2012 23:26:19 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1S7Ed6-0005eY-Oh for rsgb_lf_group@blacksheep.org; Mon, 12 Mar 2012 23:26:19 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q2CNQFQK014175 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 13 Mar 2012 00:26:15 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q2CNQE0j032429 for ; Tue, 13 Mar 2012 00:26:14 +0100 Message-ID: <4F5E860B.3080403@iup.uni-heidelberg.de> Date: Tue, 13 Mar 2012 00:26:03 +0100 From: =?ISO-8859-15?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: <4F5BD6FD.7080709@iup.uni-heidelberg.de> In-Reply-To: <4F5BD6FD.7080709@iup.uni-heidelberg.de> X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id q2CNQFQK014175 X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: VLF surprise Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: quoted-printable 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: 0:2:437322752:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d404c4f5e865a48c6 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none My new VLF grabber is back on=20 http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html Some general experiments will be done there in the next time. I still=20 have to calibrate the colors. There is some irregularity which deforms=20 the magnetic fields and so the colours. A LPF is needed as well.=20 Hopefully i can improve the S/N to get some useful sensitivity... 73, Stefan/DK7FC Am 10.03.2012 23:34, schrieb Stefan Sch=E4fer: > VLF, > > I just build an arrangement of 2 orthogonal delta loops with a=20 > circumference of 10m. They are not resonated and there is still no=20 > preamp in use, so they are directly connected to the soundcard. > They are made out of CAT5 STP cable, so it is a shielded loop with 8=20 > turns. > > Now it is possible to run SpecLab in the Colour Direction Finder mode. > > Tonite i will be silent on LF just to see how the wideband windows=20 > look on VLF. That is a new dimension for me, like switching from=20 > black-white TV to colour TV ;-) > > Sensitivity is about 15 dB down to the E field grabber on the=20 > building. This loop is 7m above ground but on the ground of the 2nd=20 > floor of that building. Room for improvements. Anyway it is most=20 > interesting to see the different colours of DHO38. > > See http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.ht= ml > > 73, Stefan/DK7FC