Return-Path: X-Spam-DCC: paranoid 1002; 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 uA4DmaMY032253 for ; Fri, 4 Nov 2016 14:48:36 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1c2enW-0000th-W9 for rs_out_1@blacksheep.org; Fri, 04 Nov 2016 13:44:47 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1c2enU-0000tY-PR for rsgb_lf_group@blacksheep.org; Fri, 04 Nov 2016 13:44:44 +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 1c2enS-00052G-8y for rsgb_lf_group@blacksheep.org; Fri, 04 Nov 2016 13:44:43 +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:References:To:Subject:Sender:Reply-To: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=vfka+otOgD8ByVG+e1/5K3mh01eZtojfEaI+t5cbhWs=; b=CrHpx1G0PLjiXUW64onNplS238 etgvQCcbfHg5+qYySxzyQP5fprfAaiI1PHWYrkl9mLiWz6/nP1rwaYmAod5BABcc9c6f1tU+4V3HL 8JeHcsFf7DoMRbXplUkHbX7t9l6K+3zTHZmGJWoOVozwSkEHwCRmYdgOFtZUlK7TXhxI=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:35685 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 1c2enQ-00050B-4w for rsgb_lf_group@blacksheep.org; Fri, 04 Nov 2016 13:44:40 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 8DAAC40073E for ; Fri, 4 Nov 2016 13:44:39 +0000 (UTC) To: rsgb_lf_group@blacksheep.org 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> From: Paul Nicholson Message-ID: <581C90C7.5030809@abelian.org> Date: Fri, 4 Nov 2016 13:44:39 +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: <581C8660.1070709@posteo.de> 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: a6b6ffaf48fdddf1ed5c25dc4bf03ee1 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 Content-Length: 1081 Status: O X-Status: X-Keywords: X-UID: 9394 > Start time: 03.11.2016 06:00:00 UTC > Symbol length: 30 s > Characters: 11 No decode of this one. > Time for a night-transmission test! Let's try. > Did you ever see a frequency offset or (relevant) time > offset on my transmissions. Frequency ok, carrier and successful decodes showed no phase shift over long periods. Signal too weak to check for short period phase changes. I haven't looked to bit clock offsets, I assume with these long symbols that it won't be a problem. > There are short periods in which the error density is > very high, Eg 13:30 to 14:30 but the noise was low. And there are short periods when it is completely red. Even random noise would only give half red. Probably just statistics. > It's a bit a pity that the phase varies so much between > day and night. No so much, 60 degrees, and I can compensate for that before the decoder. Day/night phase change should be less of a problem as we go to lower frequencies. LWPC is not much help without a better ionosphere model than its basic LWPM model. -- Paul Nicholson --