Return-Path: Received: from mtain-di06.r1000.mx.aol.com (mtain-di06.r1000.mx.aol.com [172.29.64.10]) by air-dd07.mail.aol.com (v127_r1.1) with ESMTP id MAILINDD071-860d4b8a45ab28f; Sun, 28 Feb 2010 05:30:03 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-di06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 157F438000085; Sun, 28 Feb 2010 05:30:01 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NlgON-00031Y-Lj for rs_out_1@blacksheep.org; Sun, 28 Feb 2010 10:28:55 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NlgON-00031P-6x for rsgb_lf_group@blacksheep.org; Sun, 28 Feb 2010 10:28:55 +0000 Received: from mx.omskcity.com ([79.133.160.2]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NlgOK-0006yo-KH for rsgb_lf_group@blacksheep.org; Sun, 28 Feb 2010 10:28:55 +0000 Received: from noname.nodomain.nowhere (host209.161-133-79.sotline.ru [79.133.161.209]) by mx.omskcity.com (8.13.6/8.13.6) with ESMTP id o1SASlxI095066 for ; Sun, 28 Feb 2010 16:28:48 +0600 (OMST) (envelope-from fitec@omskcity.com) Received: from localhost (fitec@localhost) by noname.nodomain.nowhere (8.8.5/8.8.5) with SMTP id RAA00211 for ; Sun, 28 Feb 2010 17:33:50 GMT X-Authentication-Warning: noname.nodomain.nowhere: fitec owned process doing -bs Date: Sun, 28 Feb 2010 17:33:50 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org In-Reply-To: <9C37FBB31AF6404980D3039622DBE323@Black> Message-ID: MIME-Version: 1.0 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.1.8 (mx.omskcity.com [79.133.160.2]); Sun, 28 Feb 2010 16:28:50 +0600 (OMST) X-Spam-Score: 1.5 (+) X-Spam-Report: autolearn=disabled,DATE_IN_FUTURE_06_12=1.498 Subject: Re: LF: Re: 9kHz noise level Content-Type: TEXT/PLAIN; charset=US-ASCII X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.9 required=5.0 tests=DATE_IN_FUTURE_06_12 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: 3039ac1d400a4b8a45a9644b X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) On Sat, 27 Feb 2010, Markus Vester wrote: > In April 2003, I attempted to transmitt an 8.97 kHz carrier, radiating > about 1 microwatt from my normal LF antenna (220 pF at ~ 9m eff. > height). I drove around and stopped in different places, putting up a 6m > fishing pole with a wire, connected to a resonant circuit and the laptop > soundcard. Each time I took a short Spectrogram full-band screenshot, > along with a narrowband capture from a special Argo version, patched for > 22 kHz samplerate. An assembly of the screenshots is at > http://freenet-homepage.de/df6nm/8970_ALL.gif. Maximum detection range > was 6 km, just marginally outside the reactive nearfield. No > noiseblanking was attempted at the time. Dear Markus, In what qrss mode (FFT-bandwith) you resived such a signal? P=1uW D=6km yelds E=1.3uV/m It seems to be usefull to estimate noise level. But we should normalyze this to bandwith. Regards, Alexander/RA9MB