Return-Path: Received: from rly-da07.mx.aol.com (rly-da07.mail.aol.com [172.19.129.81]) by air-da09.mail.aol.com (v123.4) with ESMTP id MAILINDA093-a7f49cdef06aa; Sat, 28 Mar 2009 05:34:22 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-da07.mx.aol.com (v123.4) with ESMTP id MAILRELAYINDA077-a7f49cdef06aa; Sat, 28 Mar 2009 05:34:02 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LnUub-0003nv-7c for rs_out_1@blacksheep.org; Sat, 28 Mar 2009 09:33:09 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LnUua-0003nm-TL for rsgb_lf_group@blacksheep.org; Sat, 28 Mar 2009 09:33:08 +0000 Received: from ns3.isc.de ([195.64.106.46] helo=ndisco46.misc.net) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LnUuY-0007Dh-4q for rsgb_lf_group@blacksheep.org; Sat, 28 Mar 2009 09:33:08 +0000 Received: from p5b261c98.dip0.t-ipconnect.de ([91.38.28.152] helo=[192.168.178.20]) by ndisco46.misc.net with esmtpa (Exim 4.63) (envelope-from ) id 1LnUuS-0006u5-7E for rsgb_lf_group@blacksheep.org; Sat, 28 Mar 2009 10:33:00 +0100 From: "Klaus von der Heide" To: rsgb_lf_group@blacksheep.org Date: Sat, 28 Mar 2009 10:32:48 +0100 MIME-Version: 1.0 Message-ID: <49CDFCD0.558.336691@v.d.heide.on-line.de> In-reply-to: <02803F019014433F8238BE62E2FC3BAD@Silver> References: , <02803F019014433F8238BE62E2FC3BAD@Silver> X-mailer: Pegasus Mail for Windows (4.41, DE v4.41 R1) Content-description: Mail message body X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Miles per Watt? Content-type: text/plain; charset=US-ASCII 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=0.0 required=5.0 tests=none 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-IP: 193.82.116.20 Hello Markus and all, if the reflector scatters isotropic then we have the decay of fieldstrength on the ways hence and forth which has the consequence that the received energy decays by the inverse of the FOURTH power of the distance. That was the intrinsic challenge of the EVE experiment! This also is the reason why the small distance changes of our Moon cause 2.3 dB difference in EME. 73! Klaus, DJ5HG > Gentlemen, > > sorry, but in my humble opinion a figure like "miles per watt" just doesn't make any sense. > > Fieldstrength goes with the square root of power, but decays at least proportional to inverse distance. Anyone could claim 1000 lightyears (1E16 km !) per watt, simply by feeding -165 dBm into a pair of 144 MHz dipoles spaced by 0.3 m and a QRSS3 receiver. > > A more appropiate figure would be km/sqrt(watt). > > Best regards, > Markus (DF6NM)