Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: from rly-md09.mx.aol.com (rly-md09.mail.aol.com [172.20.29.147]) by air-md09.mail.aol.com (v125.7) with ESMTP id MAILINMD092-9254aabf432140; Sat, 12 Sep 2009 15:19:32 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-md09.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMD095-9254aabf432140; Sat, 12 Sep 2009 15:19:17 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MmY7E-0003aB-ID for rs_out_1@blacksheep.org; Sat, 12 Sep 2009 20:18:32 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MmY7E-0003a2-4A for rsgb_lf_group@blacksheep.org; Sat, 12 Sep 2009 20:18:32 +0100 Received: from smtp829.mail.ird.yahoo.com ([217.146.189.243]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from <james.moritz@btopenworld.com>) id 1MmY75-0000Gs-Iu for rsgb_lf_group@blacksheep.org; Sat, 12 Sep 2009 20:18:25 +0100 Received: (qmail 64699 invoked from network); 12 Sep 2009 19:18:18 -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:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=3pWl3c8Bkca3i8PKiegBAydhiHMCSQGceK23ZEhaS3QSdJZkKYyiCepJKudPNbAz3QeBTKmugZRjcckbS7u1akik3tgzo5sogZtKH/YNzrDRZTZziWdNAiRFQJ/APbeJB4RIY8UsP43u8I0ZNM0BdlosQec5wkaS6eMlYqmWkxM= ; Received: from unknown (HELO JimPC) (james.moritz@86.179.129.189 with login) by smtp829.mail.ird.yahoo.com with SMTP; 12 Sep 2009 19:18:18 -0000 X-Yahoo-SMTP: qKIhhNCswBB2TTHr2BORWcGGR2mpopxhCcunGIxpCKQYiG07Q7UOhNo- X-YMail-OSG: OXVHUygVM1nUFwbtAzsRu6HV0GPnAkxknQ0SnHA9QwmN7PvY8TZ0IJ7B3mUumNHuyqVvK0dWMhLI9xCz3xIzSuyOB7pUhejQgyxVCKomVlO0Ie8jvGPQMyrUTXPr0pvqndJr_K.TVFkLDri0AM3ouBxE4b0yf1JbOh0265n0rGs3KZfxxWamE8y1hgBJzs44Pphu_QXt1_4Hib7l7e4wotEgJU8BV4KWoOts1h5bvvVSo2OdunmIx.xlgxBx5Cdm0_du7ptA2pv17eN5o0pFJw-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <C9B8EEE49BE84A47BED994D67B4AE0F9@JimPC> From: "James Moritz" <james.moritz@btopenworld.com> To: <rsgb_lf_group@blacksheep.org> References: <4AAB7F2D.25346.12CA10F@dave.davesergeant.com> <925667FA055F4AEEB8A57B77C90220B3@JimPC> <2EF7A94CAA43488987433D9972EE4279@AGB> In-Reply-To: <2EF7A94CAA43488987433D9972EE4279@AGB> Date: Sat, 12 Sep 2009 20:18:17 +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 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: WOLF/WSPR Sound card issues Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response 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 Graham, LF Group, If an error in sample rate was causing the error in the transmission timing, it would also lead to an error of the same percentage in the audio frequencies being generated during transmission. I.e. if transmission was about 2% short, the transmitted frequency would be about 30Hz higher than the nominal value, with an audio frequency around 1500Hz. Likewise the reported frequencies on receive would be about 30Hz lower than expected. Do you recall if this was the case? Cheers, Jim Moritz 73 de M0BMU ----- Original Message ----- From: "Graham" <g8fzk@g8fzk.fsnet.co.uk> To: <rsgb_lf_group@blacksheep.org> Sent: Saturday, September 12, 2009 3:08 PM Subject: Re: LF: Re: WOLF/WSPR Sound card issues > Jim, > > Re the size of error > > With the delta-4 card, the tx frame could be observed to be some 2 or > more seconds short of the expected time window > > 1 % ~ 1.2 seconds , 2 % ~ 2.4 seconds, assumedly indicating the clock > on the card runs fast, but as to the influence of the system by the > software, dma, irq etc Im not sure, one problem is I expect is the > soundcards are not designed to be the interface for a accurate > frequency meter / generator and as such compromises 'must' exist ...