Return-Path: Received: from mtain-db10.r1000.mx.aol.com (mtain-db10.r1000.mx.aol.com [172.29.64.94]) by air-de08.mail.aol.com (v127_r1.1) with ESMTP id MAILINDE083-5ec04b8655d8125; Thu, 25 Feb 2010 05:50:00 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-db10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 73A85380000F7; Thu, 25 Feb 2010 05:49:57 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NkbH9-0001se-Tl for rs_out_1@blacksheep.org; Thu, 25 Feb 2010 10:48:59 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NkbH9-0001sV-Im for rsgb_lf_group@blacksheep.org; Thu, 25 Feb 2010 10:48:59 +0000 Received: from mx.omskcity.com ([79.133.160.2]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NkbH6-00039j-Lg for rsgb_lf_group@blacksheep.org; Thu, 25 Feb 2010 10:48:59 +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 o1PAmphd056875 for ; Thu, 25 Feb 2010 16:48:52 +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 RAA00246 for ; Thu, 25 Feb 2010 17:53:33 GMT X-Authentication-Warning: noname.nodomain.nowhere: fitec owned process doing -bs Date: Thu, 25 Feb 2010 17:53:33 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1B18@File-Server-HST.hst.e-technik.tu-darmstadt.de> 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]); Thu, 25 Feb 2010 16:48:54 +0600 (OMST) X-Spam-Score: 1.5 (+) X-Spam-Report: autolearn=disabled,DATE_IN_FUTURE_06_12=1.498 Subject: Re: LF: AW: 9 Dreamers 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: 3039ac1d405e4b8655d50c4a X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hellow, Stefan. > If that calculation is reasonably correct, what distance could be > reached with 1,4mW @ 8,9 kHz With such a condition you'll get about 2.5 uV/m at 100 km. Seems it can be recievid. If there is no atmospheric and industrial noise it should be very strong signal. But all depends on noise on 9 kHz. I have no ideas about noise on 9 kHz. I neglet ionosphere in estimations. But at D=100 km it should be approximately right. Anyway if you can use 100 m high antenna then few of 100's km you should reach. May be substantionally more. For large distances dependance of E on D changes. On the distances more then ~100 km field should have behaviour E ~ sqrt(1/D). This yelds only 10 dB attenuation if distance became 10 times more. Thus if you'll have 20 dB over noise at 100 km (if noise is 0.25 uV/m for example) then you'll have ~10 dB over noise at 1000 km. Do it if you have such an oportunity! It is very interesting. Regards, Alexander