Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3255C380000BF; Wed, 19 Jun 2013 15:24:37 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UpNZq-0002b4-C0 for rs_out_1@blacksheep.org; Wed, 19 Jun 2013 19:57:54 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UpNZp-0002al-VW for rsgb_lf_group@blacksheep.org; Wed, 19 Jun 2013 19:57:53 +0100 Received: from nina.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1UpNZn-0006rA-UK for rsgb_lf_group@blacksheep.org; Wed, 19 Jun 2013 19:57:52 +0100 Received: from plato.ucs.mun.ca (plato.ucs.mun.ca [134.153.232.153]) by nina.ucs.mun.ca (8.13.1/8.13.1) with ESMTP id r5JIvmGS011699 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 19 Jun 2013 16:27:48 -0230 Date: Wed, 19 Jun 2013 16:27:48 -0230 (NDT) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: rsgb_lf_group@blacksheep.org In-Reply-To: Message-ID: References: MIME-Version: 1.0 X-MUN-Disclaimer: http://www.mun.ca/cc/policies/elect_communications_disclaimer_2012.php X-Spam-Score: -1.3 (-) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Markus and group, Thank-you very much for the progress report and critique of the many 2200m photons that have been eminating from my back yard over the past week. The AD9851 is clocked by a DOCXO that's calibrated against WWV to within 0.1 Hz. Initially, there were rounding errors and an error due to the resolution (~0.01 Hz). The former was eliminated using higher precision arithmetic the latter by setting the dds to 16x and dividing the output enroute to keyer the Decca. It isn't anything fancy or exotic and perhaps a just bit of good luck. [...] Content analysis details: (-1.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -1.3 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 6ffbd2c9950b634d6cc91f9565b01a8b Subject: Re: LF: VO1NA 137777.0000 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d600c51c205743890 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Markus and group, Thank-you very much for the progress report and critique of the many 2200m photons that have been eminating from my back yard over the past week. The AD9851 is clocked by a DOCXO that's calibrated against WWV to within 0.1 Hz. Initially, there were rounding errors and an error due to the resolution (~0.01 Hz). The former was eliminated using higher precision arithmetic the latter by setting the dds to 16x and dividing the output enroute to keyer the Decca. It isn't anything fancy or exotic and perhaps a just bit of good luck. So it seems the photons are now last reasonably stable, accurate, monochromatic and exhibit phase coherence. The next steps are to make them frequency agile (137.555 kHz) and to key them in a manner that preserves these properties. Perhaps I can code the OP32 directly in the microprocessor? How long would the minumim message be or would I be better off using a computer to take care of the keying? 73 to all Joe VO1NA On Tue, 18 Jun 2013, Markus Vester wrote: > Hi Joe, > > it looks like you've moved your QRG to an exact integer Hz a couple of nights ago. Just curious how you managed to circumvent the 2^-32 DDS clock raster - did you just tweak the reference frequency, or employ some sophisticated fractional-N frequency toggling scheme? > > And how about serving some freshly cooked, perfectly coherent Opera-32 to the world tonight? The famous international reception commitee is awaiting your signal ;-) > > Best 73, > Markus (DF6NM) This electronic communication is governed by the terms and conditions at http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2012.php