Return-Path: Received: from mtain-mj02.r1000.mx.aol.com (mtain-mj02.r1000.mail.aol.com [172.21.164.86]) by air-df05.mail.aol.com (v127_r1.1) with ESMTP id MAILINDF053-5ef44b8abc421d5; Sun, 28 Feb 2010 13:56:02 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mj02.r1000.mx.aol.com (Internet Inbound) with ESMTP id A9701380000A2; Sun, 28 Feb 2010 13:56:00 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NloI7-0008Lh-Ew for rs_out_1@blacksheep.org; Sun, 28 Feb 2010 18:54:59 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NloI7-0008LY-4H for rsgb_lf_group@blacksheep.org; Sun, 28 Feb 2010 18:54:59 +0000 Received: from mx.omskcity.com ([79.133.160.2]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NloI5-000192-79 for rsgb_lf_group@blacksheep.org; Sun, 28 Feb 2010 18:54:59 +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 o1SIsqlF027733 for ; Mon, 1 Mar 2010 00:54:53 +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 BAA00220 for ; Mon, 1 Mar 2010 01:59:55 GMT X-Authentication-Warning: noname.nodomain.nowhere: fitec owned process doing -bs Date: Mon, 1 Mar 2010 01:59:55 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org In-Reply-To: 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]); Mon, 01 Mar 2010 00:54:55 +0600 (OMST) X-Spam-Score: 1.5 (+) X-Spam-Report: autolearn=disabled,DATE_IN_FUTURE_06_12=1.498 Subject: LF: 9kHz without high voltage 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: 3039400c89a44b8abc40275f X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) I was wonder if it is posible to use a loop on 9 kHz. Serious problem to radiate 9 kHz is high voltage we saw. Loop has that advantage that voltage is not too high. Then i do some estimations. Let's assume vertical loop 15m x 50 m with 20 mm diameter coper tube as a wire. Then effectivity of such a loop on 9 kHz is about -65 dB. It is adequate to radiate 1 mW on 9kHz (I=250A, TX power about 4 kW). We saw such a radiation should give abt 100 km distance in QRSS. Besides such a loop is wellsuited for 136 kHz. On 136 kHz it effectivity should be about -25 dB. Not too bad: 1 W radiation with 400 W TX :-) Regards, Alexander