Return-Path: Received: from mtain-mb07.r1000.mx.aol.com (mtain-mb07.r1000.mx.aol.com [172.29.96.27]) by air-da08.mail.aol.com (v129.4) with ESMTP id MAILINDA082-86184ca8cf851ab; Sun, 03 Oct 2010 14:46:29 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb07.r1000.mx.aol.com (Internet Inbound) with ESMTP id B8406380000B2; Sun, 3 Oct 2010 14:46:27 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1P2TXx-00086e-HZ for rs_out_1@blacksheep.org; Sun, 03 Oct 2010 19:44:29 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1P2TXn-00086V-7F for rsgb_lf_group@blacksheep.org; Sun, 03 Oct 2010 19:44:19 +0100 Received: from smtp823.mail.ird.yahoo.com ([217.146.188.233]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1P2TXm-0001jN-80 for rsgb_lf_group@blacksheep.org; Sun, 03 Oct 2010 19:44:20 +0100 Received: (qmail 59985 invoked from network); 3 Oct 2010 18:44:12 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=E4RpExf214PoMIW9TNyWkgF1JuBCLcJTI40K7zmVQDoDA8njBw2pFEVttBBx4H69AuKM7O3VkDNMpX9OAysSgMoWRHlBsqpIdWe/H28BzFjcSka0zGO7FTIIzTWftN357/AQM5mQDWjulHSp5HygIDXpnncX8BNOb7Q+fW69lyE= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1286131452; bh=sbmf5+WvYVvdsL+MNB4TZwEMhS3r8bxdwP8aWGLQYks=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=LCOvt6CTOFHwuVx8giMH2uy/zU53KDoeQFym8bMXCboTBMG5oOuPdEm7oyGIDJewSi9w2kFXNXvJlR4em4JWI117lVOfezpBu69cyLJOcG8RtTY1LdBx8ofPZ8nl/PYIDsojHlnPkaRMr5Aat8NQrALT1Z5qeY/+C0u7lgTziqM= Received: from JimPC (james.moritz@86.174.31.94 with login) by smtp823.mail.ird.yahoo.com with SMTP; 03 Oct 2010 11:44:11 -0700 PDT X-Yahoo-SMTP: Cxhli3eswBD1ozmtAojhjrja86kWx0Qm9tycD5QR1DKWrOLgjJcXkw-- X-YMail-OSG: chAVSn0VM1nig56tPt.H7pG.n5ujNWZrdrl3C2EImF6KHws UQuMUPxUG.VIWG92_EJU7iQ3hoMoj29AOtK918Es3yjhkp.BFSruzLOKdWOp csac7bCFmbnlgqtPWyjO8Uf6tTDcrOU0ACleh1l0E1WKMicHSHALBVnfNU3E 6B7IKmeovnoVnXv8OPycG30iUe_cytDxTdJejSvKLCGHvMj8eCpp8s5MvsSo 8UbWoTNcUvTuuvcs4FNVby4OvpoS1 X-Yahoo-Newman-Property: ymail-3 Message-ID: From: "James Moritz" To: References: <4CA5E86D.1070208@iup.uni-heidelberg.de> <341539.91487.qm@web111910.mail.gq1.yahoo.com> In-Reply-To: <341539.91487.qm@web111910.mail.gq1.yahoo.com> Date: Sun, 3 Oct 2010 19:44:12 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18263 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: Re: looking for a simple-to-build sub-9KHz E-probe Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-AUTHENTICATION: mail_rly_antispam_dkim-m235.2 ; domain : btopenworld.com DKIM : pass x-aol-sid: 3039ac1d601b4ca8cf835cf3 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dear Daniele, LF Group, ...>It looks like something I could try to build, even without rebuilding the loop. Yes, the component values are not very critical - your existing loop should have near enough the right inductance to work fine in this circuit. The area of my loop is slightly larger, so would give slightly more input signal, but in practice the preamp noise is always 10dB or more below the band noise in the prototype, so this should not matter. Cheers, Jim Moritz 73 de M0BMU