Return-Path: Received: (qmail 5143 invoked from network); 9 Feb 2000 11:50:41 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by teachers.core.plus.net.uk with SMTP; 9 Feb 2000 11:50:41 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12IVV6-0005aA-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 09 Feb 2000 11:41:40 +0000 Received: from mail04.hostcenter.com ([195.186.64.57]) by post.thorcom.com with smtp (Exim 3.02 #1) id 12IVV4-0005a3-00 for rsgb_lf_group@blacksheep.org; Wed, 09 Feb 2000 11:41:38 +0000 Received: from www303.hostcenter.com (195.186.64.84) by mail04.hostcenter.com (RS ver 1.0.53) with SMTP id 03510570 for ; Wed, 9 Feb 2000 12:41:19 +0100 (MET) Message-ID: <38A27A64.B4580F05@phonakcom.ch> X-Priority: 3 X-MSMail-Priority: Normal Date: Thu, 10 Feb 2000 00:44:20 -0800 From: "Toni Baertschi" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Organization: Phonak Communications AG X-Mailer: Mozilla 4.7 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: LF: ERP measurements Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit X-Loop-Detect: 1 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: >>From HB2ASB, JN36pt I think it's impossible to calculate meaningful ERP values from field strength measurements from LF amateur radio stations. The measurement uncertainty is just too large. Already on VHF, ERP measurements are difficult, even in a controlled environment. As an example, look at the ETSI standards and see what they say in the chapter "measurements uncertainty". You will often find +/- 6 dB for the radiated power ( for comparison: conducted RF Power +/- 0.75 dB)! 73 de Toni