Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df05.r1000.mx.aol.com (Internet Inbound) with ESMTP id BB0DA3800009E; Thu, 2 Feb 2012 14:16:57 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Rt1rh-0000IR-1U for rs_out_1@blacksheep.org; Thu, 02 Feb 2012 18:58:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Rt1rg-0000II-KF for rsgb_lf_group@blacksheep.org; Thu, 02 Feb 2012 18:58:36 +0000 Received: from mail-pz0-f43.google.com ([209.85.210.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Rt1re-0006GS-Ez for rsgb_lf_group@blacksheep.org; Thu, 02 Feb 2012 18:58:36 +0000 Received: by damc16 with SMTP id c16so2782675dam.16 for ; Thu, 02 Feb 2012 10:58:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=3YfxHeNCgD8AolrqvdGU6Iwp0uUINKmL/816cZdzMqk=; b=Ja1M6IoU4aiVXlMvDZfhBoQAZU7ylgtuCAMG61Q23STU6YWy7CwHkgNW37cktRaAo7 qtHwX0Lo9LEVLJ5lSMdAW4ek9+mIBJ62lW+cDJLynWyxHjS5Llnd1f7is+zpzXDHuF4U O35748y/pQdUfyirR1S8ILcU7h5/2ShCiZxEs= MIME-Version: 1.0 Received: by 10.68.72.138 with SMTP id d10mr9973555pbv.15.1328209108096; Thu, 02 Feb 2012 10:58:28 -0800 (PST) Received: by 10.142.81.12 with HTTP; Thu, 2 Feb 2012 10:58:28 -0800 (PST) In-Reply-To: References: Date: Thu, 2 Feb 2012 18:58:28 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: QRSS3 "challenge" 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-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:462216832:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d022.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d40d94f2ae1291833 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none I was going to make muttering noises about the S/N being dependent on the QRSS speed, then realised ..... duh.... it doesn't matter! When normalised, -28dB always corresponds to 6dB above the noise bandwidth. What effective bandwidth (ie noise bandwidth divided by FFT bin size) have you assumed? Hamming window is about two FFT bins, Blackman Harris three, rectangular window is unity. Andy www.g4jnt.com On 2 February 2012 17:17, Rik Strobbe wrote: > Dear=A0all, > > > > as=A0mentioned=A0some=A0days=A0ago I=A0generated a=A0whole series of Oper= a,=A0WSPR > and=A0QRSS3 audio=A0with a=A0known SNR. > > For Opera and=A0WSPR=A0it was easy to=A0determine the=A0lowest=A0SNR=A0fo= r a proper > decode.=A0But=A0for=A0QRSS3=A0it is=A0much more=A0difficult as=A0it=A0dep= ends=A0on the > operators "sharp eye".=A0It must=A0be=A0somewhere in the range of -24 to = -28dB=A0SNR > (@=A02.5kHz BW). > > Today=A0I=A0did put all the=A0QRSS3 screenshots in=A0this range in a > website,=A0where=A0you=A0can=A0fill in=A0what=A0you=A0see (decode)=A0for= =A0each screenshot. > > I=A0would=A0like to invite all of=A0you to=A0give=A0it a=A0try and=A0send= me the=A0results > (the more=A0entries the=A0better the statistics). > > After=A0some time=A0(Feb 10th)=A0will put all=A0results=A0into=A0some=A0n= ice tables > and=A0graphs and=A0make=A0them available. > > Of=A0course=A0no=A0personal (individual)=A0results=A0will=A0be published.= =A0But=A0based=A0on > the=A0results=A0every participant (who=A0keeps=A0his results)=A0can=A0see= =A0where=A0he ends. > > > > The "QRSS3 Challenge"=A0can=A0be=A0found at http://on7yd.strobbe.eu/QRSS/ > > > > 73, Rik=A0=A0ON7YD - OR7T