Return-Path: Received: (qmail 29585 invoked from network); 27 Apr 2001 19:10:48 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by 10.226.25.101 with SMTP; 27 Apr 2001 19:10:48 -0000 Received: (qmail 19094 invoked from network); 27 Apr 2001 19:10:35 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 27 Apr 2001 19:10:35 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14tDUW-0003lu-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 27 Apr 2001 20:01:20 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from d06lmsgate-2.uk.ibm.com ([195.212.29.2]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14tDUV-0003kd-00 for rsgb_lf_group@blacksheep.org; Fri, 27 Apr 2001 20:01:19 +0100 Received: from d06relay01.portsmouth.uk.ibm.com (d06relay01.portsmouth.uk.ibm.com [9.166.84.147]) by d06lmsgate-2.uk.ibm.com (1.0.0) with ESMTP id TAA183590 for ; Fri, 27 Apr 2001 19:44:50 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from usa.net (ss2.bld.socks.ibm.com [9.14.4.67]) by d06relay01.portsmouth.uk.ibm.com (8.8.8m3/NCO v4.96) with ESMTP id UAA38706 for ; Fri, 27 Apr 2001 20:00:17 +0100 Message-ID: <3AE9C14B.73BB9A48@usa.net> Date: Fri, 27 Apr 2001 20:58:19 +0200 From: "Alberto di Bene" X-Mailer: Mozilla 4.76 [en] (Win95; U) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: DFCW an idea. References: <3.0.1.16.20010427101015.085fece4@mail.cc.kuleuven.ac.be> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Rik Strobbe wrote: [snip] > The most recent version of QRS supports 'time synchronisation'. I am not a > specialist in DSP stuff, but my 'intuition' says that the knowledge of the > exact start/stop time of a dot can be used to improve SNR. > > 73, Rik ON7YD The ideal way would be to know the exact time (i.e. phase) and frequency of the audio tone, so that to implement a matched filter, but this requires IMHO a Rubidium standard at least, an item not commonly found in the average OM shack (not in mine anyway). 73 Alberto I2PHD