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 tBAAQcPJ007706 for ; Thu, 10 Dec 2015 11:26:38 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a6yMn-0003ng-71 for rs_out_1@blacksheep.org; Thu, 10 Dec 2015 10:22:29 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a6yMm-0003nX-To for rsgb_lf_group@blacksheep.org; Thu, 10 Dec 2015 10:22:28 +0000 Received: from mail-wm0-f45.google.com ([74.125.82.45]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1a6yLn-0000g3-EX for rsgb_lf_group@blacksheep.org; Thu, 10 Dec 2015 10:22:27 +0000 Received: by mail-wm0-f45.google.com with SMTP id c201so25388821wme.0 for ; Thu, 10 Dec 2015 02:21:15 -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=ALOZu1WVlVIa1uucV9Oy9NQSiTH643wOEdSuLkNvweA=; b=JVF1BddtcmFHoeg844Sd2lMffxjAu7xewM/m8liJhGdOwLZ6WYQG5mRpbiOeO5nc2A /bvqKxpf9E/fuJ+K7JgyXWruYowkEx5ysjMXos7oeK+OenwYb8/iX6fi27zsQJ4QDW/h PAAbmfh+O02YXRjVrUC1NJUHuDMPhf/0nq2jmhtlUv4qIpyH8wyN1/F75EaofwFjj1bI PWWFf8OdPFZqZq+mcXR8S7IDaIUBdVuW3X0kdRd1fxYU/xABWtYVHWWts7NJ8OKFFPR+ QmYxSlK0PJVyssIM6J7wfy5DiMLaSYl55c+VGJc/JY7aFt63CCAewk9Qwbld1yJwcIip QD/A== MIME-Version: 1.0 X-Received: by 10.194.236.228 with SMTP id ux4mr11889458wjc.56.1449742874700; Thu, 10 Dec 2015 02:21:14 -0800 (PST) Received: by 10.28.130.139 with HTTP; Thu, 10 Dec 2015 02:21:14 -0800 (PST) In-Reply-To: <56686FA0.4050707@gmail.com> References: <56686FA0.4050707@gmail.com> Date: Thu, 10 Dec 2015 10:21:14 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 75bd9e83b9a4dd6aff3296cebc5bb885 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: 5711 After transferring the saved file from just one recording session yesterday evening to my big PC that can cope with 16K21 decoding.... A decode straightaway. Quite strong at 9.9dB see below. My LF receiver appears to give a small DC spike in the centre of the spectrum , which since it is taking input at 1kHz and multiplying in firmware with I/Q square waves is a bit odd. That DC term wasn't noticeable when I had the RF amplifier previously (the one that popped with strong signals) but now gain has been moved to 1kHz IF, the line can be seen. Perhaps an RF amplifier is necessary, but one that can safely be overloaded Anyway, I recorded the file with the Rx tuned 3Hz low so it gave its IF at 1003Hz, with +3Hz data coming on the serial interface and saved to the .WAV file. 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... ebnaut-rx V0.3b input file C:\EbNaut\151209_1859+3Hz_16K21A.WAV sample rate 31.250000 per second rx frequency 137370 file start time 2015-12-09 18:59:59.000 polynomial 16K21A number of chars 6 block size 52 symbol period 2.000 number of symbols 1152 list length 6000 start offset 1.000 freq offset -3.000000 cores 2 initial reference phase 79.7 --------------------------------------------- found IZ7SLZ list rank 0 reference phase 0 0 0 0 carrier RMS 1.160e+003 noise RMS 5.625e+001 carrier S/N 26.29 dB in 434.0 uHz carrier Es/N0 -4.33 dB carrier Eb/N0 10.95 dB info bit period 67.37 seconds symbol error rate 256/1152 = 22.222 % Es/N0 from symbol errors -5.3 dB Eb/N0 from symbol errors 9.8 dB Shannon capacity 815.7 bits/hour Shannon efficiency 6.6 % symbols file C:\EbNaut\151209_1859+3Hz_16K21A-symbols.csv elapsed 11 seconds Andy G4JNT On 9 December 2015 at 18:14, IZ7SLZ wrote: > GE all, > some EbNaut test transmission from IZ7SLZ/JN80 this evening every hour until > 23.00UT starting from 18:00UT. > > QRG = 137370.00 Hz > parameters: 6C, 2S, 16K21A > > 73, Domenico / iz7slz >