Return-Path: Received: (qmail 25168 invoked from network); 19 Feb 2001 16:46:30 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 19 Feb 2001 16:46:30 -0000 Received: (qmail 26921 invoked from network); 19 Feb 2001 16:21:58 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 19 Feb 2001 16:21:58 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14Usv4-0007Mt-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 19 Feb 2001 16:12:10 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from d06lmsgate-3.uk.ibm.com ([195.212.29.3]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14Usv3-0007Mo-00 for rsgb_lf_group@blacksheep.org; Mon, 19 Feb 2001 16:12:10 +0000 Received: from d06relay01.portsmouth.uk.ibm.com (d06relay01.portsmouth.uk.ibm.com [9.166.84.147]) by d06lmsgate-3.uk.ibm.com (1.0.0) with ESMTP id QAA160180 for ; Mon, 19 Feb 2001 16:02:14 GMT 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 v4.95) with ESMTP id QAA276574 for ; Mon, 19 Feb 2001 16:10:43 GMT Message-ID: <3A914553.D8AC3DB@usa.net> Date: Mon, 19 Feb 2001 17:09:55 +0100 From: "Alberto di Bene" X-Mailer: Mozilla 4.76 [en] (WinNT; U) X-Accept-Language: en,pdf MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: First Trans-Atlantic QSO References: <6454168.982595788787.JavaMail.imail@bronty> 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: john sexton wrote: > Hi Alberto, > You may not need to. There's hope for us low ERP guys yet, it seems that one > just needs to go slower and slower. What about 300 second dots or 1000 > second dots for VK and ZL? > 73, John, G4CNN > John, you probably wrote that with tongue-in-check :-) I'm afraid we have already reached the limits of the stability of the sampling rate of ordinary sound cards. Either OCXO-driven external sampling hardware must be used, or more efficient signalling schemes must be adopted. One such candidate could be the Steve Onley's FDK. I know that, theoretically, PSK can have an advantage over non-coherent FSK, but this doesn't take into account phase distortion over very long paths. But I will leave to others to discuss about the pros and cons of the two methods. 73 Alberto I2PHD