Return-Path: Received: (qmail 11177 invoked from network); 5 Dec 2001 09:51:17 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 5 Dec 2001 09:51:17 -0000 Received: (qmail 12967 invoked from network); 5 Dec 2001 09:51:18 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 5 Dec 2001 09:51:18 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16BYbF-0002rn-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 05 Dec 2001 09:44:21 +0000 Received: from mail11.svr.pol.co.uk ([195.92.193.23]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16BYbE-0002ri-00 for rsgb_lf_group@blacksheep.org; Wed, 05 Dec 2001 09:44:20 +0000 Received: from modem-114.annael.dialup.pol.co.uk ([62.136.115.114] helo=g3aqc) by mail11.svr.pol.co.uk with smtp (Exim 3.13 #0) id 16BYaS-0001Zc-00 for rsgb_lf_group@blacksheep.org; Wed, 05 Dec 2001 09:43:34 +0000 Message-ID: <000b01c17d71$5ce0d720$7273883e@g3aqc> From: "Laurie Mayhead" To: rsgb_lf_group@blacksheep.org Subject: LF: Re. Improving extreame weak signals. Date: Wed, 5 Dec 2001 09:41:47 -0000 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 5.50.4133.2400 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: Further to Riks proposals yesterday re DFCW, I should like to see more use of this mode. Also I am sure that there is more that could be done to improve both the speed of transmission and S/N ratio. But improved techniques require improved capabilities Frequency measurment accuracy,frequency stability and accurate time synchronisation are all areas where I am up against the limits of my equipment and indeed knowledge. Like Rik I do not really understand how the DSP we use works,but it would seem sensible to have defined time and frequency "slots" into which the signal could drop,so that all the available energy could be used rather than it be spread out in timeand frequency. If anyone with greater understanding of these issues would like to carry out any tests I would be pleased to co-operate either with transmitting or recieving tests. 73s Laurie.