Return-Path: X-Spam-DCC: paranoid 1233; 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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD 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 tB4Ih3Rj012503 for ; Fri, 4 Dec 2015 19:43:03 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a4vGW-0001zA-IN for rs_out_1@blacksheep.org; Fri, 04 Dec 2015 18:39:32 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a4vGW-0001z1-5P for rsgb_lf_group@blacksheep.org; Fri, 04 Dec 2015 18:39:32 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a4vFS-0001HP-0u for rsgb_lf_group@blacksheep.org; Fri, 04 Dec 2015 18:39:31 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id BF3A63273A5 for ; Fri, 4 Dec 2015 18:29:08 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 7F59328A05F3 for ; Fri, 4 Dec 2015 18:38:09 +0000 (UTC) Message-ID: <5661DD91.5070900@abelian.org> Date: Fri, 04 Dec 2015 18:38:09 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <8D2FC2AEF3A0D08-1488-1A0797@webmail-vd021.sysops.aol.com> <8D2FC914A8E0E4E-1038-20752A@webmail-vm010.sysops.aol.com> <56619CB7.4000501@abelian.org> In-Reply-To: <56619CB7.4000501@abelian.org> X-Scan-Signature: 7001055fa59a9c23b9831ea6d317a074 Subject: Re: LF: More EbNaut 137.777 - Dec. 3/4 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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: 5548 A plot of the daytime correlation of I/Q against the known encoded message http://abelian.org/vlf/tmp/151204a.gif shows significant spikes with each half-hour message, up to 14:00. Only the first two decoded: 08:30 Eb/N0 = 2.7 dB 09:00 Eb/N0 = 3.0 dB Judging from the size of the spikes the remaining daytime messages were all at least 6dB weaker, that's 3dB or more too weak to decode. My battery could be good for another night. No point in repeating the same tests. Maybe try to max out the capacity with 0.2 second symbols? Here I might get a 50% decode rate with that setting. Or go for some DX with long symbols if there are listeners further away? One hour messages perhaps instead of half-hour? So far all LF tests have been less than 30 minutes I think. One hour messages with an undisciplined oscillator will make the phase search have to work harder. -- Paul Nicholson --