Return-Path: Received: from rly-mb08.mx.aol.com (rly-mb08.mail.aol.com [172.21.131.166]) by air-mb07.mail.aol.com (v125.7) with ESMTP id MAILINMB073-d1e4ac4e28b2ec; Thu, 01 Oct 2009 13:10:47 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mb08.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMB082-d1e4ac4e28b2ec; Thu, 01 Oct 2009 13:10:37 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MtPA3-0002Bb-Tf for rs_out_1@blacksheep.org; Thu, 01 Oct 2009 18:09:47 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MtPA3-0002BS-Hn for rsgb_lf_group@blacksheep.org; Thu, 01 Oct 2009 18:09:47 +0100 Received: from smtp825.mail.ird.yahoo.com ([217.146.188.235]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1MtP8j-0001Tu-Kz for rsgb_lf_group@blacksheep.org; Thu, 01 Oct 2009 18:08:26 +0100 Received: (qmail 1500 invoked from network); 1 Oct 2009 17:09:31 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=pt4f0HTqBk1eiHqFf7Nu1X0HTzeZIn8ZUbuaLhjnnMBpWC7n4bxktGQ9VJc5NNSqwSddFev4r2TTlmWCUfbKowLF+1nL5vqlK3KlqK5ktJAVHye5r310feCYmlTUvSLZ1333xXN5SnQ229LyRygPkQlhPeWITUxtHraIX6+aqzY= ; Received: from unknown (HELO JimPC) (james.moritz@86.178.46.216 with login) by smtp825.mail.ird.yahoo.com with SMTP; 1 Oct 2009 17:09:31 -0000 X-Yahoo-SMTP: qKIhhNCswBB2TTHr2BORWcGGR2mpopxhCcunGIxpCKQYiG07Q7UOhNo- X-YMail-OSG: WGJ9cjQVM1myWOz4RD2G4Bs_ezp9DCbnM6.weIc43tfYi_W7iVhDYEkvhMyFRdEaYyfv6nCuB4E.Y.qgQrXslMn1W74Q.chapAMzpf4shmOU1MkuLzr8tvgC4GdbMu0cgYV5lvOhowNOq1pabJXk1DWPCicCDwXcDZ_zaFcT2jZnFywrYroynfJ6494ry4jJjGl5siaKcPM8ZPYUldEqc0pmF3kZp7zN2_1DZ_o0DKv.Sq6ySK0uUGriwxmis0.fQrTzPh47k6eOSlWK1GjqORvwRipOYTU0qnJRqhpA4jhVeL_todrN4fYiT87iDLp12XTJOBiqpgC7NK8- X-Yahoo-Newman-Property: ymail-3 Message-ID: <22E5FF108AB94135883D0A402EC9B85C@JimPC> From: "James Moritz" To: Date: Thu, 1 Oct 2009 18:09:29 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 X-Karma: unknown: DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: RX and Sound Card Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_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-IP: 193.82.116.20 Dear LF Group, I have just uploaded "RX_Soundcard_cal_v1.pdf" to the files page at the UK500kHz group web site (go to http://groups.google.com/group/uk500khz/files - it is down at the bottom of the list). This describes a way of calibrating receiver frequency and sound card sampling rate using an off-air standard frequency such as MSF or 198kHz R4, without requiring an accurate audio frequency to calibrate the sound card. This is addressed primarily to WOLF mode transmission and reception, where this calibration has to be done fairly accurately in order for the mode to work properly, but could also be generally useful where sound card sample rate calibration has to be done, and there is no precision audio frequency source available in the shack. Any comments would be welcome, Cheers, Jim Moritz 73 de M0BMU