Return-Path: Received: (qmail 25585 invoked from network); 13 Mar 2000 18:47:04 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by dimple.core.plus.net.uk with SMTP; 13 Mar 2000 18:47:04 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12UZfh-000567-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 13 Mar 2000 18:34:29 +0000 Received: from mb09.swip.net ([193.12.122.212]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12UZff-000561-00 for rsgb_lf_group@blacksheep.org; Mon, 13 Mar 2000 18:34:28 +0000 Received: from win95 (d212-151-98-103.swipnet.se [212.151.98.103]) by mb09.swip.net (8.8.8/8.8.8) with SMTP id TAA13121 for ; Mon, 13 Mar 2000 19:34:05 +0100 (MET) Message-ID: <000b01bf8d1b$2012ce40$0a2f97d4@win95.swipnet.se> From: "C Andersson" To: "RSGB LF group" Subject: LF: Commercial FS measurements documented Date: Mon, 13 Mar 2000 19:36:18 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: I found some interesting documents concerning FS measurements on 300 kHz at the website of ITS, Boulder, Colorado (Institute for Telecommunications Sciences). http://www.its.bldrdoc.gov/pub/dgps98/ http://www.its.bldrdoc.gov/pub/dgps97/ Calculation procedure: http://www.its.bldrdoc.gov/pub/dgps98/appdx_a.pdf In the summary: "The dependence of field strength with distance from the transmitter is in good agreement with the predictions of propagation models in the absence of irregular terrain." I have made some more measurements which are published on my home page. There is still a 5-6 dB discrepancy between calculated and measured values. Next step will be to improve the radial system with lengths of chicken net near the antenna base + ordinary radials and see what happens with the "missing dB's". 73 sm6pxj, Christer ( http://home5.swipnet.se/~w-54761/fs.htm )