Return-Path: Received: from mtain-mb04.r1000.mx.aol.com (mtain-mb04.r1000.mx.aol.com [172.29.96.24]) by air-di06.mail.aol.com (v127_r1.1) with ESMTP id MAILINDI064-eacd4b980aa9bb; Wed, 10 Mar 2010 16:10:01 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mb04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 2C957380000F7; Wed, 10 Mar 2010 16:10:00 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NpT8h-0004ct-JH for rs_out_1@blacksheep.org; Wed, 10 Mar 2010 21:08:23 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NpT8h-0004ck-66 for rsgb_lf_group@blacksheep.org; Wed, 10 Mar 2010 21:08:23 +0000 Received: from smtp827.mail.ird.yahoo.com ([217.146.189.241]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1NpT8e-00071Z-4o for rsgb_lf_group@blacksheep.org; Wed, 10 Mar 2010 21:08:23 +0000 Received: (qmail 5118 invoked from network); 10 Mar 2010 21:08:13 -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:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=uXHbL1LX3HfJNneFxWuiAKUZuqZvYgDPnyF40XbXZ4yxxY1R5kaKWKzuMOeg5/7UL7/KccWpR9MFpxVbuZS7lAoyc91w6gqMQ+pm+hd7+mzMOEgaG4jE1Pe6DXuj5ccQaToerqiFJlJB5kAL4k6k1nd+FrfKF0D/xkFx2CJ8WU0= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1268255293; bh=PP3MlxM8lgHiM5+ajSl1DZMkac0C9ISjX8DYaEHEUNI=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=WJyVUDGvK3g4gU6zs3foSv+NZpVz7J2Ij0rCTefobfzbLaOwSLKtnJvAswxjOPGCqSUz0xHy6oMd7rhblhLh3Eo6wAYyfRlPitjw5wncBEnJo+/BOzWKttHKdII7XuR8Dd4us6k2U5XT41svfVL9uG2o1O/GiMP0N5cgFkcq+as= Received: from JimPC (james.moritz@86.180.204.156 with login) by smtp827.mail.ird.yahoo.com with SMTP; 10 Mar 2010 21:08:13 +0000 GMT X-Yahoo-SMTP: Cxhli3eswBD1ozmtAojhjrja86kWx0Qm9tycD5QR1DKWrOLgjJcXkw-- X-YMail-OSG: hMuFfckVM1kVzWC1YH6cUgrKFXPtDN_hq3HWAk1dZ5L4LnqkzVkJwvnVzydQ04qPiv1nHpcBOHHmVsDUIBK4ka8x71lYKO_cB17Fj2Z2.8xmZHzCV0glerdEWxqtM.KutJyU4VHC39kCp2H2G0ZAUmdO1IgWZ9sYq.Z02EX5AFe4vglZeK0YBmf_IUM6Y0fevB5v7Js4HJDLPl3Ui0fV3HkoBgqi.uE5_EmWSXofVDNWjN7zRMjuAWg8NJ9fFV_. X-Yahoo-Newman-Property: ymail-3 Message-ID: <8FED75E9FFEE43BE876D1DD922379513@JimPC> From: "James Moritz" To: Date: Wed, 10 Mar 2010 21:08:11 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18005 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18005 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: LF: 9kHz loop/preamp for soundcard receiver Content-Type: multipart/mixed; boundary="----=_NextPart_000_0069_01CAC095.CA8319D0" 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-VSS-INFO: 5400.1158/56067 X-AOL-VSS-CODE: clean X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d295.1 ; domain : btopenworld.com DKIM : fail x-aol-sid: 3039ac1d60184b980aa85441 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_0069_01CAC095.CA8319D0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Dear LF Group, I am quite interested in the possibility of an NoV for 9kHz to extend the frequency range of my transmitting antenna experiments, but am not entirely convinced yet that it will be feasible to do field strength measurements in the same way it is at 136k and 500k. However, as a start, to investigate noise levels and so on, I have been trying out a portable receiver using a breadboard loop antenna / preamp to feed the 9kHz received signal into a laptop sound card for software-defined signal processing and display using Spectrum Lab etc. The prototype, although thrown together, seems to work quite well, covers about 3kHz - 22kHz and is pretty simple, so I thought others might be interested. The circuit diagram is attached. The antenna is a multi-turn loop about 0.8m square with the winding made as a bundle of insulated wire. It is loaded with a shunt capacitor and the input resistance of the preamp to produce a low-pass response with a cut-off frequency around 22kHz. The first stage of the preamp is a bipolar transistor with series/shunt feedback to define the gain and input impedance, which gives an equivalent input noise of about 1.8nV/sqrt Hz. The second stage is an "audio" op-amp, with RC feedback to give gain that rolls off at about 20dB/decade over the frequency range of interest, to equalise the loop output which rises with frequency, to give a roughly constant Vout/Ein around 10dB. In the tests I have done so far, the preamp noise level is at least several dB below the band noise in the region of 9kHz, so the sensitivity of the system is as good as can be used. It works successfully with DL4YHF's Spectrum Lab in various configurations, also with I2PHD's Winrad software. I would suggest keeping the preamp at least 1m away from the computer, and the loop antenna several metres away - my laptop seems to be quite noisy at VLF. The coax connecting the loop to the preamp can be any convenient length. Running both preamp and computer from batteries is very helpful when trying to identify sources of mains noise, which seems to make up most of the artificial noise in this part of the spectrum. Cheers, Jim Moritz 73 de M0BMU ------=_NextPart_000_0069_01CAC095.CA8319D0 Content-Type: image/png; name="9khz_loop_preamp.png" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="9khz_loop_preamp.png" iVBORw0KGgoAAAANSUhEUgAAA7gAAAHRAQMAAAB6k4ejAAAABlBMVEX///8AAABVwtN+AAAA CXBIWXMAABcRAAAXEQHKJvM/AAAVcUlEQVR4nO3dXWwbR2IA4JndNXfp8LQrWmgp1Ca5NJvo gENAxwUiq2y02giurg2SXPuaB9oJ7u4tMhKgOsAwlxJjy21gU0HR5iG95Hrpe14K+CEPq0iX uECQ3M/DvRQHKjYuOKBAqOQemIMgdmZ/yP3/4+7SiTkGTJFc7seZnZ+d2dkhANMwDQ9toLeA XAOk+oSUADd6q0YfJeeW9sxuzegeJ+cWXjS4GdnkZujk3Np5D5dM0p2Rzx+RgAW9l0Fm9/2r xe8cvM/KZO939HsZ8kkW9l+uv5yIe1pxl/eOmlLu0vHV5u3D4+Uu2x+wvQy5vPzRUfNaU0rC XRz0TpOgtpe7gtyPapduXfio1sgV7r2+nqEXax/mrnx4JQG38Mr6oLdIgsYPMw05d2mrJn88 vwUaoLD7JsrPtUYjd+l6Q47fLX3VlWvrmls63KoNkEt2QR+7R7Vm92oyLnu+J9e6FrfUpbGb AbXmvaNkXHC+Jp+TNbc2j9I5N79Vb7AF1W3Qryfj1l4syOcli4vzleZmEjq+iy+elp8EWn7G 7iWUzrVubnEX5WdQq/3+9KXrSeTn0l5OfvKIPFbKb+M7W/Xm6/NbuPzu3u4hF5XfS9eTKL/s 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