Return-Path: X-Spam-DCC: paranoid 104; 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 u3RHDcIL030723 for ; Wed, 27 Apr 2016 19:13:38 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1avSwt-0001S9-Tn for rs_out_1@blacksheep.org; Wed, 27 Apr 2016 18:08:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1avSwt-0001S0-Lc for rsgb_lf_group@blacksheep.org; Wed, 27 Apr 2016 18:08:27 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1avSws-0003Ox-6C for rsgb_lf_group@blacksheep.org; Wed, 27 Apr 2016 18:08:26 +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 347493273E5 for ; Wed, 27 Apr 2016 18:07:17 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 740FC4000B3 for ; Wed, 27 Apr 2016 17:08:25 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <571CF2AD.9030207@posteo.de> <571D2966.5080104@posteo.de> <571D3034.8020204@mbsks.franken.de> <571D31EE.9030106@posteo.de> <571DD4DE.3080703@abelian.org> <571E54B9.9010208@posteo.de> <571E5C16.2090102@mbsks.franken.de> <571E5F26.1080605@mbsks.franken.de> <571E92A0.3000608@posteo.de> <571E98A7.5070503@posteo.de> <571F87A2.7000700@abelian.org> <571FC3E8.1000706@posteo.de> <5720D81D.6020609@abelian.org> <5720E34C.1020700@posteo.de> From: Paul Nicholson Message-ID: <5720F209.6070001@abelian.org> Date: Wed, 27 Apr 2016 17:08:25 +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: <5720E34C.1020700@posteo.de> X-Scan-Signature: 59677119386dcf9f1872cb454dc1331d Subject: Re: VLF: EbNaut QRN and propagation considerations 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: 7873 > Would you think it is more efficient to try shorter > symbol lengths in the morning time when QRN is low > or would it be better to use 100s symbols and run > the transmission partly during higher QRN periods? I guess, the most important factor is to avoid the terminators, so set the symbol period so that the message takes all day or all night. The interleaving helps the mode to cope with spells of QRN but if the terminator changes the phase part way through by more than about 90 degrees the decode will be lost. -- Paul Nicholson --