Return-Path: <owner-rsgb_lf_group@blacksheep.org> X-Spam-DCC: paranoid 1290; 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 u41BdLuB011379 for <sq5bpf@lipkowski.org>; Sun, 1 May 2016 13:39:21 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1awpdl-0000T8-8L for rs_out_1@blacksheep.org; Sun, 01 May 2016 12:34:21 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1awpdk-0000Sz-WF for rsgb_lf_group@blacksheep.org; Sun, 01 May 2016 12:34:21 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from <vlf0403@abelian.org>) id 1awpdj-00054A-6j for rsgb_lf_group@blacksheep.org; Sun, 01 May 2016 12:34:19 +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 8E57B3273E4 for <rsgb_lf_group@blacksheep.org>; Sun, 1 May 2016 12:33:04 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 078A64000D7 for <rsgb_lf_group@blacksheep.org>; Sun, 1 May 2016 11:34:18 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <57254998.1020401@posteo.de> <8D37195DAFFAF3E-19FC-65484E@webmail-vm011.sysops.aol.com> From: Paul Nicholson <vlf0403@abelian.org> Message-ID: <5725E9BA.40300@abelian.org> Date: Sun, 1 May 2016 11:34:18 +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: <8D37195DAFFAF3E-19FC-65484E@webmail-vm011.sysops.aol.com> X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 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: 7961 Error map from Stefan's long transmission, http://abelian.org/vlf/tmp/160429a.gif Each red line indicates a bit error. I can use this recording to try the suggestion by Markus to apply some sort of gain control using the adjacent noise bands. > What would hve been the shortest symbol length to > get a decode on your side? Probably 30 seconds would have worked too, but no less unless you use a stronger code. http://abelian.org/ebnaut/calc.php?sndb=25&snbws=10.3e-6&snmps=&code=8K19&sp=30&crc=16&nc=45&submit=Calculate I've copied 7 of 7 messages from you successfully, that means you're doing a good job of selecting the symbol periods. > why are only German stations transmitting on VLF these days? No activity from the UK for a couple of years I think. Not sure we can blame the need for a Notice of Variation, it isn't very difficult to apply for. The T/A east to west is still waiting to be done and the UK has a geographic advantage there. I would have thought it the sort of thing a radio club could field a team for. -- Paul Nicholson --