Return-Path: Received: from mtain-di12.r1000.mx.aol.com (mtain-di12.r1000.mx.aol.com [172.29.64.16]) by air-de05.mail.aol.com (v127_r1.1) with ESMTP id MAILINDE052-5eb34b8667114b; Thu, 25 Feb 2010 07:03:29 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-di12.r1000.mx.aol.com (Internet Inbound) with ESMTP id E1AD3380000F2; Thu, 25 Feb 2010 07:03:22 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NkcQO-0002wC-M3 for rs_out_1@blacksheep.org; Thu, 25 Feb 2010 12:02:36 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NkcQO-0002w3-BX for rsgb_lf_group@blacksheep.org; Thu, 25 Feb 2010 12:02:36 +0000 Received: from smtp-vbr7.xs4all.nl ([194.109.24.27]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NkcQM-00044t-No for rsgb_lf_group@blacksheep.org; Thu, 25 Feb 2010 12:02:36 +0000 Received: from pc1 (ndb.demon.nl [82.161.81.65]) by smtp-vbr7.xs4all.nl (8.13.8/8.13.8) with ESMTP id o1PC2S65054987 for ; Thu, 25 Feb 2010 13:02:33 +0100 (CET) (envelope-from roelof@ndb.demon.nl) Date: Thu, 25 Feb 2010 12:02:16 -0000 To: rsgb_lf_group@blacksheep.org From: "Roelof Bakker" MIME-Version: 1.0 References: <818138.8525.qm@web28102.mail.ukl.yahoo.com> <38A51B74B884D74083D7950AD0DD85E82A1B1A@File-Server-HST.hst.e-technik.tu-darmstadt.de> Message-ID: In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1B1A@File-Server-HST.hst.e-technik.tu-darmstadt.de> 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: AW: LF: RE: Re: VLF_8.79 kHz 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: 3039ac1d40104b86670a3485 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Andy, I measured the noise on 8800 Hz received on my mini-whip. Receiver: SPM-30, BW = 24 Hz, noise level = -115 dBm The same measurement with a PERSEUS SDR and a bandwidth of 20 Hz revealed a noise level of -122 dBm. PERSEUS has an input isolating transformer, which rolls off below 15 kHz, hence the lower measured noise level. It does not look too bad to me, really. 73, Roelof Bakker, pa0rdt