Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: from mtain-mc04.r1000.mx.aol.com (mtain-mc04.r1000.mx.aol.com [172.29.96.76]) by air-dc04.mail.aol.com (v129.4) with ESMTP id MAILINDC041-86004c0b7700225; Sun, 06 Jun 2010 06:22:56 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mc04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9F9DB3800011A; Sun, 6 Jun 2010 06:22:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OLCzK-0005GL-6E for rs_out_1@blacksheep.org; Sun, 06 Jun 2010 11:21:54 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OLCzJ-0005GC-M3 for rsgb_lf_group@blacksheep.org; Sun, 06 Jun 2010 11:21:53 +0100 Received: from smtp-vbr4.xs4all.nl ([194.109.24.24]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from <roelof@ndb.demon.nl>) id 1OLCzG-0002mw-Vj for rsgb_lf_group@blacksheep.org; Sun, 06 Jun 2010 11:21:53 +0100 Received: from pc1 (ndb.demon.nl [82.161.81.65]) by smtp-vbr4.xs4all.nl (8.13.8/8.13.8) with ESMTP id o56ALj6d066041 for <rsgb_lf_group@blacksheep.org>; Sun, 6 Jun 2010 12:21:50 +0200 (CEST) (envelope-from roelof@ndb.demon.nl) To: rsgb_lf_group@blacksheep.org References: <004801cb04d6$e9740b80$0401a8c0@xphd97xgq27nyf> <CD190EC05BA84C1685A9A2F4A56DD284@JimPC> <004301cb0544$56965980$0201a8c0@Clemens04> <FF5414DBC74E45B69F5D9E01FDFB4A0C@White> <DFFD7B2AF9C74F0C9C1BFD90F8559389@JimPC> Date: Sun, 06 Jun 2010 10:21:43 -0000 MIME-Version: 1.0 From: "Roelof Bakker" <roelof@ndb.demon.nl> Message-ID: <op.vdvi2hheyzqh0k@pc1> In-Reply-To: <DFFD7B2AF9C74F0C9C1BFD90F8559389@JimPC> User-Agent: Opera Mail/10.53 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes Subject: Re: LF: Re: Re: VLF 9 kcs: preamp and antenna noise 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: 3039ac1d604c4c0b76fd4f97 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Dear Jim, > The figures Clemens quotes for the Perseus RX are curious < PERSEUS has a rf-isolating transformer at the input, which has a low frequncy roll off. At 10 kHz the attenuation is 8 dB, so the stated noise figure of 27 dB at 9 kHz complies with this. Best regards, Roelof Bakker, pa0rdt