Return-Path: Received: (qmail 17073 invoked from network); 25 Sep 2001 11:09:36 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 25 Sep 2001 11:09:36 -0000 Received: (qmail 19406 invoked from network); 25 Sep 2001 11:08:22 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 25 Sep 2001 11:08:22 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15lpzy-0003Nm-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 25 Sep 2001 12:03:34 +0100 Received: from protactinium.btinternet.com ([194.73.73.176] helo=protactinium) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15lpzx-0003Ng-00 for rsgb_lf_group@blacksheep.org; Tue, 25 Sep 2001 12:03:33 +0100 Received: from [213.1.77.86] (helo=default) by protactinium with smtp (Exim 3.22 #6) id 15lpzJ-0006fH-00 for rsgb_lf_group@blacksheep.org; Tue, 25 Sep 2001 12:02:54 +0100 Message-ID: <000601c145b1$214ce520$564d01d5@default> From: "Alan Melia" To: "LF-Group" Subject: LF: re DDS purity Date: Tue, 25 Sep 2001 11:21:56 +0100 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 4.72.3110.5 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 Andy thanks for the comment and resoring my faith. I was a little confused after the discussion about using a PLL to 'clean a DDS up' earlier this year and a coment from Dan Tayloe on the hoembrew newsgroup which I past for interest. -----excerpt-------------------------------- DDSs are kind of dirty as they are really designed for transmitters (certainly clean enough for that) or for cellular phone reception for signals of with limited dynamic range (such as a cellular basestation using power control of all the phones in its area). -------------------------------- He is talking about what is virtually a DC receiver, using a DDS as the LO. Cheers de Alan G3NYK Alan.Melia@btinternet.com