Return-Path: Received: from rly-dd08.mx.aol.com (rly-dd08.mail.aol.com [172.19.141.155]) by air-dd10.mail.aol.com (v125.7) with ESMTP id MAILINDD101-b954b0580f63c0; Thu, 19 Nov 2009 12:31:45 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dd08.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDD087-b954b0580f63c0; Thu, 19 Nov 2009 12:31:36 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NBAox-0001Se-RW for rs_out_1@blacksheep.org; Thu, 19 Nov 2009 17:29:27 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NBAox-0001SV-Ei for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2009 17:29:27 +0000 Received: from mail-yx0-f203.google.com ([209.85.210.203]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NBAor-0000vm-Ac for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2009 17:29:27 +0000 Received: by yxe41 with SMTP id 41so5273584yxe.30 for ; Thu, 19 Nov 2009 09:29:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=a41Jhz7aLf372YbVDS3/KcCsiMoFtCSzobI9GSHANjw=; b=gcUqgQ/o+FvF6uUR0kpBJRxoi3MQMcDKX7uh9EgxsJekvzMeMUuZT/b0tMTVOoyNWb nlEmQoG8lwJ6RSzvDllmvrpdDo2TNseMIk6J6JmRHcSEDf8L37tqZfAeuIQGvzw2p1l4 sJWEcgJdMPfFfEOl6Gzipm620rL2fW0Bw3J/A= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=MggknXRi2I+TbN4JMcuZ4wbUwKDHLOLkmdHVVHkLclBwUHVuoV1jquSIgajgq1P84Q vWgkW4Ez8Ed2vMHjCEr+b4qiFrPhJ87VwuMsCuLowtx8g2J+cwT0n9r0cUChdP1BADuX eg6K8ySfOyUoyaTOgwKPmk6s6NMSDqGbsKNdQ= MIME-Version: 1.0 Received: by 10.239.168.204 with SMTP id l12mr32575hbe.36.1258651747793; Thu, 19 Nov 2009 09:29:07 -0800 (PST) In-Reply-To: <4B0570B4.8040209@telia.com> References: <4B0570B4.8040209@telia.com> Date: Thu, 19 Nov 2009 17:29:07 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Karma: unknown: DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: WSPR 2.0 is now available Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d269.2 ; domain : googlemail.com DKIM : pass X-Mailer: Unknown (No Version) It has a calibration procedure built in, but as far as I can make out, is aimed at solving frequency offset / tuning errors. I may have missed something, but there seems to be no facility to calibrate for soundcard errors in the same way as WSJT does, which can affect symbol timing . As we found in discussion on theis reflector a year or so ago. Sample rate timing error is enough to destroy WSPR decoding even when signals are strong. May be wrong, and will go and re read the appendices associated with calibration, but no mention is made, specifically, of soundcard sampling rate error - only refrences to frequency error. FOrtunately, as WSPR is designed around 12000Hz sampling, this is rarely out by more than a few ppm in most modern cards. See my Column in the latest RadCom for some soundcard sampling rate measurements - and how bad some are Andy www.g4jnt.com This email has been scanned for damaging side-effects by the health and safety police 2009/11/19 Johan Bodin : > > =A0http://physics.princeton.edu/pulsar/K1JT/ > > > 73 > Johan SM6LKM > > >