X-GM-THRID: 1230267035195243042 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.115.73.3 with SMTP id a3cs1067126wal; Wed, 7 Mar 2007 05:27:55 -0800 (PST) Received: by 10.67.19.17 with SMTP id w17mr4350264ugi.1173274074673; Wed, 07 Mar 2007 05:27:54 -0800 (PST) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id a1si2074747ugf.2007.03.07.05.27.52; Wed, 07 Mar 2007 05:27:54 -0800 (PST) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) DomainKey-Status: bad (test mode) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1HOw3f-0000Qg-QW for rs_out_1@blacksheep.org; Wed, 07 Mar 2007 13:19:55 +0000 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1HOw3f-0000QX-Aw for rsgb_lf_group@blacksheep.org; Wed, 07 Mar 2007 13:19:55 +0000 Received: from smtp804.mail.ird.yahoo.com ([217.146.188.64]) by relay2.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1HOw3c-0007Eo-L1 for rsgb_lf_group@blacksheep.org; Wed, 07 Mar 2007 13:19:55 +0000 Received: (qmail 9360 invoked from network); 7 Mar 2007 13:19:45 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Received:X-YMail-OSG:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=Qlb1P0w9v0tvZyGXpI+FoXn9+Q4V4lZJD+sDRpD6I3Drm2piAWQY1/4nRXnLFUF8mINV3Th5KMBoe6waIelYUjYx+dS5Jk04RY7eLJFIZGEFGk56TQRdNe0EO/nDa7hJjWp5U8kJWCJMt9UhlF/OgDX3lNJYg0FgUP7RLRYxZfg= ; Received: from unknown (HELO lark) (alan.melia@btinternet.com@81.131.22.203 with login) by smtp804.mail.ird.yahoo.com with SMTP; 7 Mar 2007 13:19:45 -0000 X-YMail-OSG: d6BX24kVM1ma1W2HYl3ocjnjkOUUkO2__q2Xz34RtN3WfRTsUf8Msi8.kVRXrkqkce_VtzkO9aV5hxI8UxztUXO1Hyk0AuoHfXNDFxs5nuNhU7yBiasSgKzULz9j0y3QXUAm86m_3OjANb1DlAnoyzo- Message-ID: <005301c760bb$4d4a1500$0300a8c0@lark> From: "Alan Melia" To: Date: Wed, 7 Mar 2007 13:19:53 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 DomainKey-Status: good (testing) X-Spam-Score: -0.5 (/) X-Spam-Report: autolearn=disabled,AWL=-0.526 Subject: LF: 500kHz ERP calculation Content-Type: text/plain; charset="iso-8859-1" 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 Status: O X-Status: X-Keywords: X-UID: 2463 Hi all, Just in case it might be of use/interest i have loaded an Excel spreadsheet onto my web site which does a calculation of the ERP of a Marconi and loop aerial, of the same dimensions. This may be useful for determining what aerial current you must restrict to if you are to stay within the 100mW ERP restriction. Exterience on 136khz has shown that the measured ERPs from typical amateur locations are about 6dB below the value calculated . This is probably due to the high angle radiation of short aerials and the absorption of foliage and surrounding buildings. The sheet is not yet indexed on my "download" page but may be accessed directly with www.alan.melia.btinternet.co.uk/download/ERP1.xls Please allow for finger trouble at this end and advise if there are any problems of access or operation. Cheers de Alan G3NYK