Content-Type: text/plain; charset=US-ASCII; format=flowed Return-Path: Content-Transfer-Encoding: 8bit Received: (qmail 17863 invoked from network); 23 Oct 2002 07:29:44 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 23 Oct 2002 07:29:44 -0000 Received: (qmail 15712 invoked from network); 23 Oct 2002 07:28:58 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 23 Oct 2002 07:28:58 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 184Fv9-0001fU-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 23 Oct 2002 08:27:15 +0100 Received: from [203.10.110.71] (helo=thunder.netspace.net.au) by post.thorcom.com with esmtp (Exim 4.10) id 184Fv6-0001fL-00 for rsgb_lf_group@blacksheep.org; Wed, 23 Oct 2002 08:27:13 +0100 Received: from fred1 (dialup-203-113-254-66.Hobart.netspace.net.au [203.113.254.66]) by thunder.netspace.net.au (8.12.6/8.11.6) with SMTP id g9N7R3KG083559 for ; Wed, 23 Oct 2002 17:27:10 +1000 (EST) (envelope-from vk7ro@netspace.net.au) Message-ID: <3.0.6.32.20021023182439.007af590@pop.netspace.net.au> X-Sender: vk7ro@pop.netspace.net.au (Unverified) X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32) Date: Wed, 23 Oct 2002 18:24:39 +1100 To: rsgb_lf_group@blacksheep.org From: "Richard Rogers" In-reply-to: <3DB57FA7.8030504@virgin.net> References: <7D653C9C42F5D411A27C00508BF8803DCB9C55@mail.dstl.gov.uk> MIME-Version: 1.0 Subject: Re: LF: Jason versions and DDS COntroller X-Spam-Status: No, hits=-0.5 required=5.0tests=IN_REP_TO,REFERENCES,SPAM_PHRASE_00_01version=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group At 05:41 PM 10/22/02 +0100, you wrote: > > >Following the presentation on Data at the HFC, I have >been thinking about methods of generating Jason. > >It seems to me that one of the difficulties is building >the transmitter, which either requires a controlled >DDS, or a mixer arrangement of some sort. > >A more convenient method would be to make the >software program a conventional HF tx thriugh its >CAT interface and use the divide by 100 method to >generate 136KHz output. > >Unfortunately it is common for transmitter to be >limited to a resolution of 10Hz, which ultimately >leads to a resolution of 10mHz reather than the >1mHz that Jason calls for. > >I was wondering if it would be worth sacrificing the >bandwidth for the increased convenience of signal >generation? > >73 > >Stewart G3YSX > A contolled LF DDS is now very easy to make. See http://www.qsl.net/zl1bpu/micro/EXCITER/Index.htm 73, Ric, VK7RO