Return-Path: Received: (qmail 18112 invoked from network); 13 Nov 1999 00:24:28 +0000 Received: from unknown (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 13 Nov 1999 00:24:28 +0000 Received: (qmail 9952 invoked from network); 13 Nov 1999 00:23:16 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 13 Nov 1999 00:23:16 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11mQeb-00033k-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 13 Nov 1999 00:02:53 +0000 Received: from carbon.btinternet.com ([194.73.73.92]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11mQeU-00033f-00 for rsgb_lf_group@blacksheep.org; Sat, 13 Nov 1999 00:02:47 +0000 Received: from [62.6.20.75] (helo=default) by carbon.btinternet.com with smtp (Exim 2.05 #1) id 11mQeG-0003uc-00 for rsgb_lf_group@blacksheep.org; Sat, 13 Nov 1999 00:02:32 +0000 Message-ID: <002a01bf2d6a$5133dd40$1717063e@default> From: "Alan Melia" To: "rsgb_lf_group" Subject: LF: Rik's proposal for QRS cw Date: Fri, 12 Nov 1999 21:53:32 -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 4.72.3110.5 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: Hi Rik well done, as an old RTTY operator (BC....Before Computers!), I had wondered about FSK. As far as I could see from the weak signals I have looked at on waterfall dispays, there could be a extra benefit. You would get a little bit of extra edge when decoding as it would be logically 'dot-and-not-dash'. So there would not be quite the same decode problem were at present the static cuts a dash into two dots. The frequency discrimination would take care of that (or the static would wipe out the element completely). It certainly would be worth trialling. Cesare mentions frequency stability, but I transmitted RTTY 170Hz shift on 432 MHz in the 1970s by FMing a crystal oscillator. I believe that this technique would be adequate for simple (the best kind) transmit systems on 136. Easier still if you are already using a crystal mixer exciter. I think as Cesare says we need an absolute definition of which element will be the higher RF frequency. Your call Rik! 73 de Alan G3NYK Alan.Melia@btinternet.com