Return-Path: Received: (qmail 84261 invoked from network); 21 Nov 2004 20:12:06 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 21 Nov 2004 20:12:06 -0000 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CVyLu-0004jp-64 for dave@picks.force9.co.uk; Sun, 21 Nov 2004 20:30:30 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1CVy46-0000tP-I2 for dave@picks.force9.co.uk; Sun, 21 Nov 2004 20:12:06 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CVy1o-0003m6-UE for rs_out_1@blacksheep.org; Sun, 21 Nov 2004 20:09:44 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CVy1o-0003lx-Hg for rsgb_lf_group@blacksheep.org; Sun, 21 Nov 2004 20:09:44 +0000 Received: from smtpout01-04.mesa1.secureserver.net ([64.202.165.79]) by relay.thorcom.net with smtp (Exim 4.41) id 1CVy1l-00016n-2w for rsgb_lf_group@blacksheep.org; Sun, 21 Nov 2004 20:09:44 +0000 Received: (qmail 11181 invoked from network); 21 Nov 2004 20:09:29 -0000 Received: from unknown (68.116.172.18) by smtpout01-04.mesa1.secureserver.net (64.202.165.79) with ESMTP; 21 Nov 2004 20:09:29 -0000 Message-ID: <003f01c4d006$32655760$0500a8c0@charter.net> From: "John Andrews" To: rsgb_lf_group@blacksheep.org References: Date: Sun, 21 Nov 2004 20:10:49 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-SPF-Result: relay.thorcom.net: 64.202.165.79 is neither permitted nor denied by domain of w1tag.com X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=no,RCVD_IN_SORBS=0.1 Subject: LF: Re: CFH on 136.9559 kHz ? Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Markus, Curiosity took over, and I attempted a mid-afternoon measurement of the CFH carrier's field strength. I get 235 uV/M at 697 kM. A quick check with a great circle plot shows about 70% of that path to be over sea water. Ground conductivity for the rest of the path is awful (blame the last ice age), no better than 1/2500 of sea water. If anyone can factor in the earth's curvature and calculate an unattenuated field from this, be my guest. John Andrews