Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tBABbV4i007903 for ; Thu, 10 Dec 2015 12:37:31 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a6zRN-0004ua-JH for rs_out_1@blacksheep.org; Thu, 10 Dec 2015 11:31:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a6zRN-0004uR-AI for rsgb_lf_group@blacksheep.org; Thu, 10 Dec 2015 11:31:17 +0000 Received: from mail-wm0-f49.google.com ([74.125.82.49]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1a6zQJ-00014H-2q for rsgb_lf_group@blacksheep.org; Thu, 10 Dec 2015 11:31:16 +0000 Received: by wmec201 with SMTP id c201so20457199wme.1 for ; Thu, 10 Dec 2015 03:29:49 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=ahdUAJZkbB1u/x8n6N/C4vJQ5zMgAr/gnWjh4GYwwl8=; b=kRABGIIYYvKeY6duJOMcMdpDhTqZ6WK26yPTbjNOX2BHHHu6Jlr7Irk7gBoERPUfjy jtK4oIEUG/Y+aONgCbs99lliiFggMeU6Qhjr/HbtVc6amcUj5Smcj9BQCObige8maofN 50w9AsvT//mzbseuIDmCq9ReGrLwUur0B0h9kiWZoqoqQhrX81N0RvSjUj5nmqSt4qun Ck7Hdp8kBGEJ0HgXzY1xvgaa75rgCvgsC5KAVJzrkAloiPitSe8PO4xlOcd6RXbBUt4I ui8DtUV68/AWYGZ/pLLRf6j/d7doxxepllebjbWFUU6o4Y77QSc3C76rlzRQPzbTOxEB PMBg== MIME-Version: 1.0 X-Received: by 10.28.15.194 with SMTP id 185mr18368015wmp.9.1449746989521; Thu, 10 Dec 2015 03:29:49 -0800 (PST) Received: by 10.28.130.139 with HTTP; Thu, 10 Dec 2015 03:29:49 -0800 (PST) In-Reply-To: <56695B15.6010203@abelian.org> References: <56686FA0.4050707@gmail.com> <56695B15.6010203@abelian.org> Date: Thu, 10 Dec 2015 11:29:49 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: fc152e7304849b9a177649b85aea9f41 Subject: Re: LF: LF EbNaut test from JN80 on 137370 Content-Type: text/plain; charset=UTF-8 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 5718 Hmm, hadn't thought of that. I'll check my generated .WAV files via the waterfall plot in Spec Lab to make sure the I/Q is the right way round. Although, I think I did check it once and thought it all agreed, but another test will help. Meanwhile, plotting 0.004Hz bin-ize waterfall plots of two PN sequence generators used as noise source. Paint dries quicker that this Andy On 10 December 2015 at 10:59, Paul Nicholson wrote: > > Results of IZ7SLZ 16K21A 6C 2S 2015-12-09 > > 18:00 no decode > 19:00 Eb/N0 = 4.4 dB BER = 34.1% rank 0 ph uniform > 20:00 Eb/N0 = 4.2 dB BER = 34.5% rank 0 ph 0 30 30 60 > 21:00 Eb/N0 = 3.5 dB BER = 35.5% rank 0 ph uniform > 22:00 Eb/N0 = 7.5 dB BER = 27.8% rank 0 ph uniform > 23:00 Eb/N0 = 7.1 dB BER = 28.8% rank 0 ph uniform > 00:00 no further decodes > > Easy decodes with such a strong signal, weakest was about -48 dB S/N > in 2.5kHz. Symbol timing is within 30mS. > > Andy wrote: > >> I discovered by trial and error The FreqOffset window in >> EbNaut had ot be set to [minus] -3Hz to compensate for the >> positive shift on the input - after spending a fruitless >> few minutes trying at +3Hz . But I suppose this is the >> same meaning and sign as the start time offset... > > It should have needed offset +3Hz. Following the principle > of least surprise we would expect +3Hz to mean the signal is > at +3Hz in the input! > > Maybe one of us needs to reverse the sign of the Q signal? > -- > Paul Nicholson > -- >