Return-Path: Received: from mtain-de07.r1000.mx.aol.com (mtain-de07.r1000.mx.aol.com [172.29.64.207]) by air-mb06.mail.aol.com (v127_r1.1) with ESMTP id MAILINMB062-a6ff4bac786a257; Fri, 26 Mar 2010 05:03:39 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-de07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 467B3380000BF; Fri, 26 Mar 2010 05:03:37 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Nv5QN-0005QB-P2 for rs_out_1@blacksheep.org; Fri, 26 Mar 2010 09:01:51 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Nv5QN-0005Q2-Di for rsgb_lf_group@blacksheep.org; Fri, 26 Mar 2010 09:01:51 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Nv5QL-0004ok-Sh for rsgb_lf_group@blacksheep.org; Fri, 26 Mar 2010 09:01:51 +0000 Received: from abelian.netcom.co.uk (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id A606D3291CC for ; Fri, 26 Mar 2010 08:58:57 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by abelian.netcom.co.uk (8.13.1/8.13.1) with ESMTP id o2Q91gsA031371 for ; Fri, 26 Mar 2010 09:01:43 GMT Message-ID: <4BAC77F6.8060605@abelian.org> Date: Fri, 26 Mar 2010 09:01:42 +0000 From: Paul Nicholson User-Agent: Thunderbird 2.0.0.14 (X11/20080421) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4B9FD008.2070607@abelian.org> <4BAAA535.4050401@toya.net.pl> <4BAB1E85.1060304@abelian.org> <4BABA614.4030303@abelian.org> <38A51B74B884D74083D7950AD0DD85E82A1B96@File-Server-HST.hst.e-technik.tu-darmstadt.de> In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1B96@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: AW: LF: Ionospheric VLF propagation Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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: 3039ac1d40cf4bac78694624 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Stefan schrieb: > ... you display an audio stream from the sicilian VLF stn > in 1438km. So, you may know how strong the average noise level > and it's behavior as a function of daytime is. The rx is not calibrated, nor have I looked at background variation. I will set up something to record relative average background, we can see what the diurnal looks like and pick a good time from that. > Do you mean it is possible to reach that station in DFCW 600 > if i increase to 4mW ERP? I don't know. I guess the signal will be detected with some integration, no problem. But decoding a message? Not sure, your 4mW signal might be about 2 or 2.5fT at Caselle, but we don't know the background noise. -- Paul Nicholson --