Return-Path: X-Spam-DCC: paranoid 1480; 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,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 uA6KsqL4006372 for ; Sun, 6 Nov 2016 21:54:52 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1c3UOj-0006g1-T4 for rs_out_1@blacksheep.org; Sun, 06 Nov 2016 20:50:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1c3UOj-0006fs-Ar for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2016 20:50:37 +0000 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1c3UOg-0000Pg-Jq for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2016 20:50:36 +0000 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:To:References:Reply-To:Subject:Sender:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=VIh47Macxz9fwdXTYHN1d3/dIP5ia5uCx+TUADu9jSM=; b=fOV9PtMP++jSan2bYqwdUKPcaM l6tTe14fIGVkWRIuHZ+4QgHELBPTgeSHE5wB49UH1sHgzAvoTbysrQfAxA9I7l/Ey63UaloVEbqZn qYIOOLvSLLNdEDWKWaWP0eF+7jh7W8PpqpCHD/1Ga9O0+0uoVdUKc23KgKH5XlI2D/PI=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:48351 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1c3UOe-00077R-CV for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2016 20:50:32 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id B1FF24000AE for ; Sun, 6 Nov 2016 20:50:31 +0000 (UTC) References: <154c32c4dba-373a-24653@webprd-m58.mail.aol.com> <573CAF79.9040701@abelian.org> <573CBBF0.4030701@posteo.de> <573E5907.6020107@posteo.de> <573EA094.3040205@abelian.org> <573EF90F.1080201@posteo.de> <573FC4DA.3080107@abelian.org> <5740842D.3030000@posteo.de> <5744FA27.6010703@posteo.de> <57F56531.3060205@posteo.de> <5817DE39.9010506@posteo.de> <5818DDAB.7000804@abelian.org> <5819E3AA.3020906@posteo.de> <581A452F.6060506@abelian.org> <581A4BC6.9030106@abelian.org> <581A541E.9050406@abelian.org> <581A8098.8050909@posteo.de> <581C3027.8050003@abelian.org> <581C8660.1070709@posteo.de> <581C90C7.5030809@abelian.org> <581C95BC.6010602@posteo.de> <581DA8E4.5010701@abelian.org> <581DB9C0.10602@posteo.de> <581DCF2E.5090902@abelian.org> To: rsgb_lf_group@blacksheep.org From: Paul Nicholson Message-ID: <581F9797.9060709@abelian.org> Date: Sun, 6 Nov 2016 20:50:31 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <581DCF2E.5090902@abelian.org> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz 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: 9417 Stefan wrote: > f = 6470.00000 Hz > Start time: 03.11.2016 06:00:00 UTC > Symbol length: 30 s > Characters: 11 > CRC 16 > Coding 16K25A and > A second transmission is running now [5th Nov] > Same message, symbol length, phase orientation > and start time... No decode of either message. I added the two days coherently and that also failed to decode. I tested the processing with simulated signals and that gave the expected 3dB gain. Looked at the cross correlation of the two days but can see nothing. The simulated signals at about Eb/N0 0.0dB are visible on a cross correlation. This will only work if the received phase doesn't change much from one day to another. We may need some luck, some stable weather and ionosphere. To keep the office warm, the computer is trying some range of phase shifts between the two days. -- Paul Nicholson --