Return-Path: Received: (qmail 19095 invoked from network); 22 May 2001 05:20:27 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 22 May 2001 05:20:27 -0000 Received: (qmail 4100 invoked from network); 22 May 2001 05:19:54 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 22 May 2001 05:19:54 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 1524VT-0008WK-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 22 May 2001 06:14:55 +0100 Received: from cobalt4.source.net ([206.100.10.38]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 1524VR-0008WF-00 for rsgb_lf_group@blacksheep.org; Tue, 22 May 2001 06:14:53 +0100 Received: from dellml ([210.155.48.100]) by cobalt4.source.net (8.9.3/8.9.3) with SMTP id WAA00889 for ; Mon, 21 May 2001 22:14:15 -0700 Message-ID: <001301c0e27e$71b751d0$1a00a8c0@scgroup.com> From: "Stewart Nelson" To: rsgb_lf_group@blacksheep.org References: <3B08FCDC.484F74DF@virgin.net> Subject: LF: Re: Wimborne talk on Wolf Date: Mon, 21 May 2001 22:16:34 -0700 Organization: SC Group 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 5.00.2919.6700 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 Stewart and all, > I was also thinking that you could send wolf on the divide down > CW transmitters that some folks use. By injecting the audio > tone from a PC into a 13.6MHz transceiver operating SSB and > then dividing down by 100 you should generate an equivalent > signal to the linear translation approach save for the envelope > shaping. Yes, I think that would work pretty well. For example, 800 Hz audio could represent a bit with no phase transition, 1300 Hz for a transition. The 500 Hz shift, divided by 100, would be 5 Hz, and over the 0.1 second bit time would give the desired 180 degree phase shift. > However by keying the carrier off-on during the transition > the normal CW wave shaping should clean up the signal. That should not be necessary, because the signal is constant amplitude. With smoother transitions one could have a quite narrow spectrum. > Does this work? Note that the error in the carrier will be the > dominant term, and not the error in the modulation, which may > have some advantages. > > Stewart G3YSX Yes, the divide by 100 should result in very good stability. If anyone would like to try transmitting this way, let me know and I'll add the mode to WOLF. 73, Stewart KK7KA