Return-Path: Received: (qmail 12544 invoked from network); 1 Aug 2002 15:33:33 -0000 Content-Transfer-Encoding: 8bit Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 1 Aug 2002 15:33:33 -0000 Received: (qmail 6213 invoked from network); 1 Aug 2002 15:33:37 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 1 Aug 2002 15:33:36 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17aJe6-0005J1-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 01 Aug 2002 18:21:54 +0100 Received: from hestia.herts.ac.uk ([147.197.200.9]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17aJe5-0005Iw-00 for rsgb_lf_group@blacksheep.org; Thu, 01 Aug 2002 18:21:53 +0100 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 17aHuD-0000ah-00 for rsgb_lf_group@blacksheep.org; Thu, 01 Aug 2002 16:30:25 +0100 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 17aHuC-00035a-00 for rsgb_lf_group@blacksheep.org; Thu, 01 Aug 2002 16:30:24 +0100 Message-ID: <5.1.0.14.0.20020801150448.00ac5c58@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Thu, 01 Aug 2002 15:25:42 +0100 To: rsgb_lf_group@blacksheep.org From: "James Moritz" Subject: Re: LF: Droitwich carrier In-reply-to: <009d01c2394e$f5025bc0$62f7a941@user> References: <200208010356.g713ujZ12610@block.iamanidiot.com> <3D49015E.E2800231@usa.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Dear LF Group, I looked at several LF and MF broadcast carriers last night; some showed carrier levels that increased in the quiet periods like Droitwich, others increase the carrier level with increasing modulation like DLF, and some just have a plain, steady carrier - from which I conclude there is no consensus amongst broadcast engineers! All this is very interesting, but it makes it more difficult to measure the field strength - I suppose the thing to do is measure the carrier level during a period of silence in the programme material, when the carrier level is constant, at least for a second or two. Also, how does one interpret the transmitter power of these stations? If Droitwich is 500kW, is this carrier power, and if so under what conditions ("peak carrier power" perhaps?) or PEP? - or mean power? Cheers, Jim Moritz 73 de M0BMU