Return-Path: Received: from rly-dc04.mx.aol.com (rly-dc04.mail.aol.com [172.19.136.33]) by air-dc07.mail.aol.com (v121_r4.4) with ESMTP id MAILINDC074-b1a4973794a344; Sun, 18 Jan 2009 13:47:57 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dc04.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDC046-b1a4973794a344; Sun, 18 Jan 2009 13:47:39 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LOcg5-00056s-Pe for rs_out_1@blacksheep.org; Sun, 18 Jan 2009 18:47:21 +0000 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LOcg5-00056j-CQ for rsgb_lf_group@blacksheep.org; Sun, 18 Jan 2009 18:47:21 +0000 Received: from imo-d23.mx.aol.com ([205.188.139.137]) by relay2.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LOcg4-0008Q2-7D for rsgb_lf_group@blacksheep.org; Sun, 18 Jan 2009 18:47:21 +0000 Received: from MarkusVester@aol.com by imo-d23.mx.aol.com (mail_out_v39.1.) id l.c93.3cf53d8a (37097) for ; Sun, 18 Jan 2009 13:47:07 -0500 (EST) Received: from Black (g229074091.adsl.alicedsl.de [92.229.74.91]) by cia-db07.mx.aol.com (v121_r5.5) with ESMTP id MAILCIADB077-90e94973792912e; Sun, 18 Jan 2009 13:47:07 -0500 Message-ID: <3A121E9CEE544EDE99C1246EB03982ED@Black> From: "Markus Vester" To: References: In-Reply-To: Date: Sun, 18 Jan 2009 19:47:04 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MIMEOLE: Produced By Microsoft MimeOLE V6.0.6000.16669 X-Spam-Flag:NO X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,AWL=0.000 Subject: LF: Re: WSPR SNR 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=0.1 required=5.0 tests=LINES_OF_YELLING, 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 Jim, I would agree on your conclusion. Theoretically, a marginal "M" qrss signal with 6 dB SNR in 0.5 Hz noise bandwidth would rank - 34 - 3 + 6 dB = -31 dB on K1JT's scale, which is related to 2.5 kHz bandwidth. But the spectrogram impression may be a little "unfair", as a QRSS-3 signal with all the power contained in a single FFT bin would certainly appear brighter than this WSPR signal which is diluted over 6 Hz. Kind regards Markus, DF6NM ----- Original Message ----- From: "James Moritz" To: Sent: Sunday, January 18, 2009 7:23 PM Subject: LF: WSPR SNR Dear LF Group, The attached bit of spectrogram was set up for QRSS3 reception and shows 2 succesfully decoded WSPR transmissions from G4WGT at -30 and -27dB SNR respectively. I think this shows that this mode should compete well with QRSS3 for readibility. So far, I have: 1654 1 0.6 0.503500 0 G4JNT IO90 30 1752 -28 1.0 0.503599 0 G4WGT IO83 37 1758 -30 1.0 0.503599 0 G4WGT IO83 37 1810 -30 1.1 0.503599 0 G4WGT IO83 37 1814 -27 0.9 0.503599 0 G4WGT IO83 37 Cheers, Jim Moritz 73 de M0BMU