Return-Path: Received: from rly-dd08.mx.aol.com (rly-dd08.mail.aol.com [172.19.141.155]) by air-dd08.mail.aol.com (v121_r4.4) with ESMTP id MAILINDD081-b9249817658ac; Thu, 29 Jan 2009 04:26:52 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dd08.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDD084-b9249817658ac; Thu, 29 Jan 2009 04:26:50 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LSTAD-0000FI-75 for rs_out_1@blacksheep.org; Thu, 29 Jan 2009 09:26:21 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LSTAC-0000F9-RM for rsgb_lf_group@blacksheep.org; Thu, 29 Jan 2009 09:26:20 +0000 Received: from pne-smtpout1-sn2.hy.skanova.net ([81.228.8.83]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LSTAC-0004hf-4O for rsgb_lf_group@blacksheep.org; Thu, 29 Jan 2009 09:26:20 +0000 Received: from [127.0.0.1] (62.20.250.99) by pne-smtpout1-sn2.hy.skanova.net (7.3.129) (authenticated as u33233109) id 48A144C50298A183 for rsgb_lf_group@blacksheep.org; Thu, 29 Jan 2009 10:26:14 +0100 Message-ID: <49817638.9070007@telia.com> Date: Thu, 29 Jan 2009 10:26:16 +0100 From: "Johan H. Bodin" User-Agent: Thunderbird 2.0.0.19 (Windows/20081209) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <00c701c9818b$2aac4520$6401a8c0@asus> <16976E02F609403791409C408C93AFCA@AGB> <3692CCEF55434A78A271B29E8D4BC318@JimPC> In-Reply-To: <3692CCEF55434A78A271B29E8D4BC318@JimPC> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: WSPR - G0NBD Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) James Moritz wrote: > Eventually, I realised that the > difference was that your transmissions are a few seconds shorter than > the locally generated signals Dear Jim, LF, that is a clear evidence of a soundcard sampling rate error. I am quite sure that all timing in the WSPR software is derived from the sampling frequency and, if memory serves me, the WSPR program uses a sampling rate of 12kHz. If the soundcard does not support this rate and/or has a "physical" sampling rate that is not a multiple of 12kHz (for example 44.1 kHz), then the driver or window$ will kick in a "resampler" between the soundcard and the WSPR application which is asking for 12kHz. Many such resamplers are known to be inaccurate... 73 Johan SM6LKM