Return-Path: Received: from mtain-dc08.r1000.mx.aol.com (mtain-dc08.r1000.mx.aol.com [172.29.64.136]) by air-mf01.mail.aol.com (v127_r1.1) with ESMTP id MAILINMF014-8bcc4b8d7d063a8; Tue, 02 Mar 2010 16:03:02 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dc08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3223C38000302; Tue, 2 Mar 2010 16:02:43 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NmZDh-0004QN-NX for rs_out_1@blacksheep.org; Tue, 02 Mar 2010 21:01:33 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NmZDh-0004QE-7J for rsgb_lf_group@blacksheep.org; Tue, 02 Mar 2010 21:01:33 +0000 Received: from lnx500.hrz.tu-darmstadt.de ([130.83.156.225]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NmZDf-0001gf-FO for rsgb_lf_group@blacksheep.org; Tue, 02 Mar 2010 21:01:33 +0000 Received: from FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de (File-Server-HST.hst.e-technik.tu-darmstadt.de [130.83.212.129]) by lnx500.hrz.tu-darmstadt.de (8.14.2/8.14.2/HRZ/PMX) with SMTP id o22L1TRo032212 for ; Tue, 2 Mar 2010 22:01:30 +0100 (envelope-from schaefer@hst.tu-darmstadt.de) Received: from [127.0.0.1] (helo=File-Server-HST.hst.e-technik.tu-darmstadt.de) by FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de with AVK MailGateway; for ; Tue, 02 Mar 2010 22:01:30 +0100 Content-class: urn:content-classes:message MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Tue, 2 Mar 2010 22:01:30 +0100 Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B2C@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: <38A51B74B884D74083D7950AD0DD85E82A1B2C@File-Server-HST.hst.e-technik.tu-darmstadt.de> Thread-Topic: LF: Re: 9kHz noise level Thread-Index: Acq6NjOx45uKAu0xTk25xse9d/pXvgAEwC5V References: <4B8CE312.7090904@abelian.org> <20100302110052.BFCD8F3864@smtps02.kuleuven.be> <4B8D015B.10205@abelian.org> <4B8D5529.1060501@abelian.org> From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= To: X-AVK-Virus-Check: AVB 19.717;31.01.2010 X-PMX-TU: seen v0.99a by 5.5.9.388399, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2010.3.2.204823 X-PMX-SPAMCHECK: outgoing mail X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01CABA4B.882330B7" Subject: AW: LF: Re: 9kHz noise level 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-VSS-INFO: 5400.1158/55717 X-AOL-VSS-CODE: clean x-aol-sid: 3039ac1d40884b8d7cf32585 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01CABA4B.882330B7 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Excellent Paul! Tnx for motivation ;-) =20 I know the LT1028 as the best audio op amp (available for noncommercial cu= stomers) for such applications and have also built a narrow band LF preamp= with it. In comparison to the OP27 it gives 10...20dB more gain at 137kHz= with even less noise than 1nV/sqrt Hz.=20 =20 PSE, what is your locator or the locator where your Rx antenna is placed?= ;-) =20 What do you recommend to those, who just receive with a wire in the sound= card? I have thought about an active antenna, maybe with the BF862 wich= gave vy gd results on LF. Of course an isolating transformer for AF. And= what about a simple band pass filter to supress the 50Hz and it's harmoni= cs? Necessary or dispensable? =20 For 10 Euro i have bought an external USB soundcard that provides 30dB les= s background noise! The input AF filter can be simply modified by changing= some SMD Ls and Cs. =20 Your RX system sounds professional. Except the mains ethernet that causes= QRM to other hams being active on HF! =20 What are your experiences about the needed distance between antenna wire= and the house and what about hight above ground? If one is using a simple= wire, which lenght is adequate? Is there principally the need for amplifi= cation or can it just be reached by increasing the wire length? Sounds lik= e simple questions but maybe they aren't.. =20 73 es tnx being QRV! :-) =20 Stefan/DK7FC ------_=_NextPart_001_01CABA4B.882330B7 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 eJ8+Ih8VAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEgAEAHQAAAEFXOiBMRjogUmU6IDlrSHog bm9pc2UgbGV2ZWwAywgBBYADAA4AAADaBwMAAgAWAAEAHgACAB0BASCAAwAOAAAA2gcDAAIAFgAB AB4AAgAdAQEJgAEAIQAAADkyOTJEQUIzQkY3N0JGNDg5RDg1MjA5RURDNjIyNTIzAD8HAQOQBgAw EQAAOAAAAAMANgAAAAAAQAA5ALcwI4hLusoBHgA9AAEAAAAFAAAAQVc6IAAAAAACAUcAAQAAADIA AABjPURFO2E9IDtwPUhTVDtsPUZJTEUtU0VSVkVSLUgtMTAwMzAyMjEwMTMwWi0xMzE0AAAAHgBJ AAEAAAAdAAAAUmU6IExGOiBSZTogOWtIeiBub2lzZSBsZXZlbAAAAABAAE4AgBon/DO6ygEeAFoA AQAAACMAAABvd25lci1yc2diX2xmX2dyb3VwQGJsYWNrc2hlZXAub3JnAAACAVsAAQAAAGMAAAAA AAAAgSsfpL6jEBmdbgDdAQ9UAgAAAABvd25lci1yc2diX2xmX2dyb3VwQGJsYWNrc2hlZXAub3Jn AFNNVFAAb3duZXItcnNnYl9sZl9ncm91cEBibGFja3NoZWVwLm9yZwAAAgFcAAEAAAAoAAAAU01U 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