Return-Path: Received: (qmail 13286 invoked from network); 22 Oct 2002 16:42:14 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 22 Oct 2002 16:42:14 -0000 Received: (qmail 14150 invoked from network); 22 Oct 2002 16:43:37 -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; 22 Oct 2002 16:43:37 -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 18426M-0008BC-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 22 Oct 2002 17:41:54 +0100 Received: from [144.254.98.48] (helo=cisco.com) by post.thorcom.com with esmtp (Exim 4.10) id 18426M-0008Au-00 for rsgb_lf_group@blacksheep.org; Tue, 22 Oct 2002 17:41:54 +0100 Received: from virgin.net (lon-sto4-lan-vlan132-dhcp10.cisco.com [144.254.108.13]) by cisco.com (8.8.8/2.6/Cisco List Logging/8.8.8) with ESMTP id RAA14919 for ; Tue, 22 Oct 2002 17:41:18 +0100 (BST) Message-ID: <3DB57FA7.8030504@virgin.net> Date: Tue, 22 Oct 2002 17:41:11 +0100 From: "Stewart Bryant" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <7D653C9C42F5D411A27C00508BF8803DCB9C55@mail.dstl.gov.uk> Subject: Re: LF: Jason versions and DDS COntroller Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=-1.0 required=5.0tests=REFERENCES,SPAM_PHRASE_00_01,USER_AGENT, USER_AGENT_MOZILLA_UA,X_ACCEPT_LANGversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group 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