Return-Path: Received: (qmail 4438 invoked from network); 1 Aug 2001 09:38:41 -0000 Received: from unknown (HELO warrior-inbound.services.quay.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 1 Aug 2001 09:38:41 -0000 Received: (qmail 8612 invoked from network); 1 Aug 2001 09:38:25 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 1 Aug 2001 09:38:25 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15RsMO-0006fR-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 01 Aug 2001 10:32:12 +0100 Received: from fep02.swip.net ([130.244.199.130] helo=fep02-svc.swip.net) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15RsMK-0006fM-00 for rsgb_lf_group@blacksheep.org; Wed, 01 Aug 2001 10:32:08 +0100 Received: from oemcomputer ([212.151.46.177]) by fep02-svc.swip.net with SMTP id <20010801093122.CQZQ11576.fep02-svc.swip.net@oemcomputer> for ; Wed, 1 Aug 2001 11:31:22 +0200 Message-ID: <005301c11a64$6b64bb60$9a2597d4@oemcomputer> From: "Johan Bodin" To: rsgb_lf_group@blacksheep.org Subject: LF: SV: LF Receivers Date: Wed, 1 Aug 2001 11:31:21 +0300 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="------------000406080209030900060902" 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: This is a multi-part message in MIME format. --------------000406080209030900060902 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Andy, >But isn't the accuracy and stability of a cheap colour subcarrier xtal, >pulled more than 100ppm from its normal operating point, going to swamp the >values you derive from the 'nice' numbers generated with integer maths ? Not if it is phase locked to the 5/10MHz standard. My idea was to use a second DDS chip as divider (with fixed "nice number" phase increment) to get a "nice number" PLL reference frequency. The VCXO is then the only odd-ball frequency in the system. 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