Return-Path: Received: from mtain-ma05.r1000.mx.aol.com (mtain-ma05.r1000.mx.aol.com [172.29.96.13]) by air-db02.mail.aol.com (v127_r1.1) with ESMTP id MAILINDB024-86964b8d0e95360; Tue, 02 Mar 2010 08:11:49 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma05.r1000.mx.aol.com (Internet Inbound) with ESMTP id DBF063800009D; Tue, 2 Mar 2010 08:11:42 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NmRrf-0003Jp-1r for rs_out_1@blacksheep.org; Tue, 02 Mar 2010 13:10:19 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NmRre-0003Jg-NC for rsgb_lf_group@blacksheep.org; Tue, 02 Mar 2010 13:10:18 +0000 Received: from smtp-vbr13.xs4all.nl ([194.109.24.33]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NmRrc-0006xw-2R for rsgb_lf_group@blacksheep.org; Tue, 02 Mar 2010 13:10:18 +0000 Received: from pc1 (ndb.demon.nl [82.161.81.65]) by smtp-vbr13.xs4all.nl (8.13.8/8.13.8) with ESMTP id o22DA6sg096332 for ; Tue, 2 Mar 2010 14:10:15 +0100 (CET) (envelope-from roelof@ndb.demon.nl) Date: Tue, 02 Mar 2010 13:10:03 -0000 To: rsgb_lf_group@blacksheep.org From: "Roelof Bakker" MIME-Version: 1.0 References: <4B8CE312.7090904@abelian.org> <20100302110052.BFCD8F3864@smtps02.kuleuven.be> <4B8D015B.10205@abelian.org> Message-ID: In-Reply-To: <4B8D015B.10205@abelian.org> User-Agent: Opera Mail/9.63 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: 9kHz noise level Content-Type: text/plain; format=flowed; delsp=yes; charset=iso-8859-15 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: 3039ac1d600d4b8d0e8e264b X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Paul, Thank you for providing these interesting graphs. Which program do you use for these graphs? I presume that the antenna is directly connected to your soundcard. Is this correct? I am using a PERSEUS SDR for VLF reception. However, it has a rf-isolating transformer at the input. So reception below 10 kHz is out of calibration and just marginal at 8.97 kHz. The Alpha stations are received here 20 dB above the noise on an E-field probe. Best regards, Roelof Bakker