Return-Path: Received: (qmail 21246 invoked from network); 1 Aug 2001 08:32:45 -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 08:32:45 -0000 Received: (qmail 6972 invoked from network); 1 Aug 2001 08:32:31 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 1 Aug 2001 08:32:31 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15RrMK-000679-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 01 Aug 2001 09:28:04 +0100 Received: from relay.dera.gov.uk ([192.5.29.49]) by post.thorcom.com with smtp (Exim 3.16 #2) id 15RrMI-000674-00 for rsgb_lf_group@blacksheep.org; Wed, 01 Aug 2001 09:28:03 +0100 Content-Transfer-Encoding: 8bit Received: (qmail 6200 invoked from network); 1 Aug 2001 09:25:18 +0100 Received: from trtnmail.dera.gov.uk (146.80.9.56) by relay.dera.gov.uk with SMTP; 1 Aug 2001 09:25:18 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 23455 invoked from network); 1 Aug 2001 09:29:28 +0100 Received: (ofmipd 192.5.29.90); 1 Aug 2001 08:29:06 -0000 Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id JAA03668; Wed, 1 Aug 2001 09:33:17 +0100 (BST) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: (qmail 13586 invoked from network); 1 Aug 2001 09:18:44 -0000 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 1 Aug 2001 09:18:44 -0000 Received: by gauntlet.mail.dera.gov.uk; id JAA00967; Wed, 1 Aug 2001 09:06:21 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma000945; Wed, 1 Aug 01 09:06:15 GMT Received: from mailex.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with SMTP id for ; Wed, 1 Aug 2001 09:27:13 +0100 Received: (qmail 5843 invoked from network); 1 Aug 2001 08:15:46 +0100 Date: 1 Aug 2001 09:25:44 +0100 Message-ID: <7D653C9C42F5D411A27C00508BF8803D55C574@pdw-mail-r1.dstl.gov.uk> From: "Andrew Talbot" To: rsgb_lf_group@blacksheep.org X-5Received: from softdnserror (HELO cchecker.dstl.gov.uk) (192.168.248.52) by mailex.dstl.gov.uk with SMTP; 1 Aug 2001 07:15:46 -0000 X-4Received: from FRN-MAIL-R3.dstl.gov.uk (unverified) by cchecker.dstl.gov.uk (Content Technologies SMTPRS 4.1.2) with ESMTP id for ; Wed, 1 Aug 2001 08:15:36 +0100 X-3Received: by FRN-MAIL-R3 with Internet Mail Service (5.5.2650.21)id ; Wed, 1 Aug 2001 09:25:47 +0100 Subject: LF: LF Receivers MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: 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 ? Andy > -----Original Message----- > From: John Andrews [mailto:w1tag@charter.net] > Sent: 2001-07-31 23:52 > To: rsgb_lf_group@blacksheep.org > Subject: LF: Re: SV: LF Receivers > > > Johan, > > Another interesting clock frequency for 32 bit DDS chips is 3579.13941... > kHz, one third the frequency you mentioned. It is easily "pullable" from a > common 3579.545 kHz color burst crystal. While it yields tuning steps of the > oddball value of 0.8333... mHz, it allows integer math to 10 mHz resolution, > which is sufficient for most LF work. I am currently building an LF exciter > based on this setup, using an AD9850 DDS chip. > -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.