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=-0.8 required=5.0 tests=BAYES_00,FORGED_RCVD_HELO, RATWARE_GECKO_BUILD,SPF_PASS 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 u3TKP7xA004856 for ; Fri, 29 Apr 2016 22:25:08 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1awEv7-00020p-4f for rs_out_1@blacksheep.org; Fri, 29 Apr 2016 21:21:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1awEv6-00020g-Sb for rsgb_lf_group@blacksheep.org; Fri, 29 Apr 2016 21:21:48 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1awEv5-0006NL-CK for rsgb_lf_group@blacksheep.org; Fri, 29 Apr 2016 21:21:47 +0100 Received: from pn.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id BFEB63273E4 for ; Fri, 29 Apr 2016 21:20:34 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 0299440000F for ; Fri, 29 Apr 2016 20:21:46 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <57237FB9.2060507@posteo.de> <8D3705FBF0E442D-628-9A0506@webmail-vm001.sysops.aol.com> From: Paul Nicholson Message-ID: <5723C259.3090800@abelian.org> Date: Fri, 29 Apr 2016 20:21:45 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <8D3705FBF0E442D-628-9A0506@webmail-vm001.sysops.aol.com> X-Scan-Signature: b77892ad90d0261eaf071f4f6cf31464 Subject: Re: VLF: EbNaut transmission on 8270.1 Hz again and again Content-Type: text/plain; charset=utf-8; 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7931 > 27 hours will not be easy. Indeed, four terminators to cope with. Half the message will have daytime phase and half night time phase and a mess in between. No chance of a decode if day and night phase differs by more than 90 deg (which it probably will). So I will have to get a nominal phase from LWPC or my own modeling program (or just guess) and use that to EQ the signal before decode. An interesting challenge! Thanks Stefan > Start: 29.04.2016 16:00:02 > Period: 40 > Length: 45 (!) No problem with the length, and for future tests like this, why not run a 16K code (with half symbol period) and with longer constraint length, eg 16K25A? The decoder will need about 100 Gbyte RAM for that, but that's ok, I just use a big AWS Xeon with 36 cores and a ton of RAM. The extra bit of coding gain is worth it and might make all the difference. -- Paul Nicholson --