Return-Path: Received: (qmail 29226 invoked from network); 25 Nov 2001 16:29:51 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 25 Nov 2001 16:29:51 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 11436 invoked from network); 25 Nov 2001 16:30:00 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 25 Nov 2001 16:30:00 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16826c-0005tR-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 25 Nov 2001 16:26:10 +0000 Received: from hestia.herts.ac.uk ([147.197.200.9]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16826b-0005tM-00 for rsgb_lf_group@blacksheep.org; Sun, 25 Nov 2001 16:26:09 +0000 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 16825v-0007nC-00 for rsgb_lf_group@blacksheep.org; Sun, 25 Nov 2001 16:25:27 +0000 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 16824o-0004GF-00 for rsgb_lf_group@blacksheep.org; Sun, 25 Nov 2001 16:24:18 +0000 Message-ID: <5.1.0.14.0.20011125161143.00ae99c0@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Sun, 25 Nov 2001 16:25:26 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" Subject: Re: LF: RTTY on 73.3 kHz? In-reply-to: <000b01c175c7$584a71a0$491686d4@ericadodd> References: <4f.14ca23c4.293040de@aol.com> <007401c174d6$fc38f8a0$a3ca28c3@ericadodd> <001501c174ec$f212b260$0300a8c0@charter.net> <000201c1751b$6063bb00$3dce28c3@ericadodd> <3C000DE3.AED73455@att.net> <3C0011CB.3156569C@att.net> <001d01c175b1$0b29bb30$0400000a@parissn2> <3C01071D.34B4F3AC@att.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 Dexter, Peter, LF Group, Can't remember what the ERP for the 73.25k Rugby transmission was when I measured it last, but I think it was in the 10s of kW. With amateur signals of the order of 100mW or so, the difference in ERP is more like 50 to 60dB. No wonder the noise sidebands are such a pain for amateur operation in the UK! Incidentally, I find that the 25Hz filter on the SPM19 selective level meter I have rings rather badly with thunderstorm QRN, so often better results can often be had using a wider filter, even with narrow band signals. Cheers, Jim Moritz, 73 de M0BMU