Return-Path: <majordom@post.thorcom.com> Received: (qmail 7816 invoked from network); 5 Feb 2001 21:02:58 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 5 Feb 2001 21:02:58 -0000 Received: (qmail 24498 invoked from network); 5 Feb 2001 20:56:57 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 5 Feb 2001 20:56:57 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14Psa4-0000Ip-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 05 Feb 2001 20:49:48 +0000 Received: from amersham.mail.uk.easynet.net ([195.40.1.45]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14Psa3-0000Ii-00 for rsgb_lf_group@blacksheep.org; Mon, 05 Feb 2001 20:49:47 +0000 Received: from ericadodd (tnt-1-243.easynet.co.uk [195.40.206.243]) by amersham.mail.uk.easynet.net (Postfix) with SMTP id EE7E6175F6 for <rsgb_lf_group@blacksheep.org>; Mon, 5 Feb 2001 20:49:26 +0000 (GMT) Message-ID: <003701c08fb5$8056d240$f3ce28c3@ericadodd> From: "g3ldo" <g3ldo@ukonline.co.uk> To: rsgb_lf_group@blacksheep.org Subject: LF: The hight-tech learning curve Date: Mon, 5 Feb 2001 20:50:29 -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 5.50.4522.1200 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: <majordom@post.thorcom.com> I have just built a DDS signal generator based on a PIC16F84 and an AD9850 with a backlit Hitachi LCD display; and using surface mount technology throughout. (don't fall off you chair with surprise Andy). Needless to say this is a kit - but I can say, that in spite of advancing years and less than perfect eyesight (at short range) it can be done. This kit, designed by Mick Hodges, G4OPE, covers from 0 to 50MHz and is clocked at 100MHz. There are 16 selectable memories and 8 selectable step sizes. The board is programmed with supplied SW in DOS. The output is filtered by a 3-pole elliptic filter and amplified by an (optional) MAR6 to give an output at 73 and 136kHz of a clean 2.25V P to P waveform. At the moment it is in the testing stage and won't be in use until it is properly installed in a RF proof die-cast box. The kit is produced by Hands Electronics at www.rf-kits.demon.co.uk Regards, Peter, G3LDO <g3ldo@ukonline.co.uk> I have checked the frequency stability