Return-Path: Received: from rly-db06.mx.aol.com (rly-db06.mail.aol.com [172.19.130.81]) by air-db09.mail.aol.com (v125.7) with ESMTP id MAILINDB092-ace4ab1fdfb242; Thu, 17 Sep 2009 05:14:48 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db06.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDB064-ace4ab1fdfb242; Thu, 17 Sep 2009 05:14:37 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MoD3k-0007vp-G4 for rs_out_1@blacksheep.org; Thu, 17 Sep 2009 10:13:48 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MoD3j-0007vg-US for rsgb_lf_group@blacksheep.org; Thu, 17 Sep 2009 10:13:47 +0100 Received: from moutng.kundenserver.de ([212.227.126.188]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1MoD2d-0008ID-0z for rsgb_lf_group@blacksheep.org; Thu, 17 Sep 2009 10:12:39 +0100 Received: from [192.168.1.64] (host86-177-29-128.range86-177.btcentralplus.com [86.177.29.128]) by mrelayeu.kundenserver.de (node=mreu2) with ESMTP (Nemesis) id 0MKv5w-1MoD3U2qiv-0001WN; Thu, 17 Sep 2009 11:13:33 +0200 From: "Dave Sergeant" To: rsgb_lf_group@blacksheep.org Date: Thu, 17 Sep 2009 10:13:32 +0100 MIME-Version: 1.0 Message-ID: <4AB1FDBC.28794.CE89A8@dave.davesergeant.com> In-reply-to: <9afca2640909170123m5b55c351obbeb512476e39fbb@mail.gmail.com> References: <9afca2640909170123m5b55c351obbeb512476e39fbb@mail.gmail.com> X-mailer: Pegasus Mail for Windows (4.51) Content-description: Mail message body X-Provags-ID: V01U2FsdGVkX1+HjsJD96Ehfsnx1q51R6ZEhLMQRrFzOc/lDBY yrtAdTbE6OuAknIwtS09NYA0/0USqYFyb9aeh/7I91lXyajZAD L6/5UY6oyuOlxXu6NNp4KAGgKuhIX39 X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: WSPR threshold reports Content-type: text/plain; charset=US-ASCII 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 On 17 Sep 2009 at 9:23, Roger Lapthorn wrote: > Just had these 2 reports. I am very surprised WSPR can detect these low > S/N levels... > > 2009-09-17 08:12 G3XBM 0.503838 *-33* 1 JO02dg 0.001 G7NKS > IO92ub 46 240 2009-09-17 07:56 G3XBM 0.503839 * -32* 0 JO02dg > 0.001 G7NKS IO92ub 46 240 > 73s > Roger Still nothing at all here Roger, there were a couple of very weak broken lines on the waterfall but no copy. I tend to take the dB figures in WSRP with a pinch of salt. Jim, James and Gus are quite strong signals and not only audible by ear all the time but reading well on the s meter - James 579, Gus peaking over s9 at times but with deep QSB, and Jim - if it wasn't a row of LEDs it would be bending the meter. G7NKS shows between -3dB and -17dB on WSPR (with the input adjusted for a correct 0dB on noise), implying he is below the noise... I think all that can be deduced is the relative strengths against an unknown reference. With the signals heard here WSPR7 gives reliable decodes down to around -20dBm and a few gibberish decodes at the -30dBm level. I have not copied anything lower, and when I do get decodes the signal is easily copyable by ear and a very obvious line on the spectrogram. One point is that with the K2 you cannot set a narrow filter at 1.5kHz (a limitation of the tuning range of its IF BFO). I am sure if you used such a narrow receive filter the results would be spectacularly better, but I am stuck with the SSB filter. 73 Dave G3YMC http://www.davesergeant.com