Envelope-to: dave@picks.force9.co.uk Delivery-date: Tue, 19 Apr 2005 15:11:41 +0100 Received: from ptb-spamcore01.plus.net ([192.168.71.1]) by pih-mxcore10.plus.net with esmtp (PlusNet MXCore v1.0) id 1DNtS1-0002yJ-Am for dave@picks.force9.co.uk; Tue, 19 Apr 2005 15:11:41 +0100 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DNtUw-000N5e-J9 for dave@picks.force9.co.uk; Tue, 19 Apr 2005 15:14:42 +0100 Received: from [192.168.101.73] (helo=pih-mxcore07.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DNtUw-000N5W-9L for dave@picks.force9.co.uk; Tue, 19 Apr 2005 15:14:42 +0100 Received: from post.thorcom.com ([193.82.116.20]) by pih-mxcore07.plus.net with esmtp (PlusNet MXCore v1.0) id 1DNtRz-0007YC-Ry for dave@picks.force9.co.uk; Tue, 19 Apr 2005 15:11:39 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DNtRO-0006Ax-Oe for rs_out_1@blacksheep.org; Tue, 19 Apr 2005 15:11:02 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DNtRO-0006Ao-E4 for rsgb_lf_group@blacksheep.org; Tue, 19 Apr 2005 15:11:02 +0100 Received: from smarthost4.mail.uk.easynet.net ([212.135.6.14]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DNtRN-0007lE-5R for rsgb_lf_group@blacksheep.org; Tue, 19 Apr 2005 15:11:02 +0100 Received: from tnt-13-226.easynet.co.uk ([212.134.22.226] helo=erica) by smarthost4.mail.uk.easynet.net with smtp (Exim 4.10) id 1DNtRL-000Kwu-00 for rsgb_lf_group@blacksheep.org; Tue, 19 Apr 2005 15:11:00 +0100 Message-ID: <000401c544ea$07cae2a0$e21686d4@erica> From: "g3ldo" To: rsgb_lf_group@blacksheep.org References: Date: Tue, 19 Apr 2005 14:20:23 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 X-SPF-Result: relay.thorcom.net: 212.135.6.14 is neither permitted nor denied by domain of ukonline.co.uk X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: LF: Re: XDW on "Alien space invader mode" Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Hi Laurence > XDW on 137.7752/137.7756 Khz DFCW dot 90 - Dash High > > Dot is being swept from 137.7752 to 137.7755 KHz and back at a rate of 3 > sec per "cycle" > In the early days of QRSS I was using an analogue signal generator as a driver. This was somehow frequency modulated so that the frequency varied up and down during key down. This had the effect of causing the dots and dashes on the readout to look like worms - much ridiculed at the time but it made for a very identifiable signal under marginal conditions. Peter G3LDO