Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, T_DKIM_INVALID,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v7LGwF51011744 for ; Mon, 21 Aug 2017 18:58:17 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1djpsT-0000BE-Bx for rs_out_1@blacksheep.org; Mon, 21 Aug 2017 17:48:37 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1djpsS-0000B5-HW for rsgb_lf_group@blacksheep.org; Mon, 21 Aug 2017 17:48:36 +0100 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 4.89) (envelope-from ) id 1djpsP-0002JO-7Y for rsgb_lf_group@blacksheep.org; Mon, 21 Aug 2017 17:48:35 +0100 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=5ozTBVjp4LqOq2urqpNBbcR2IOYPbsH/mE5eK9NYPKk=; b=A3L6nnXFe0SHziI/kaS2iBTMtU IxdmF/HHRDjblMJfyrQrms/03ozMFJkp9KeosA/8LmNtp+p7dKY8FWhgCJhdo71VzN0n2L8rZqHr5 +OqWQZQtfwepFemjGoM634fKBdb7uh2ZmaXcuRJLmuxeyWlTKmFFbsCEsPXvZKbZppzM=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:37241 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1djpsN-0005tj-E1 for rsgb_lf_group@blacksheep.org; Mon, 21 Aug 2017 17:48:31 +0100 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id CA3B640002B for ; Mon, 21 Aug 2017 16:48:30 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <15e04c36a3d-c04-4d48@webjas-vab154.srv.aolmail.net> From: Paul Nicholson Message-ID: Date: Mon, 21 Aug 2017 16:48:30 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <15e04c36a3d-c04-4d48@webjas-vab154.srv.aolmail.net> 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: Carrier on 4470.005 Hz! 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 2.75 Status: O X-Status: X-Keywords: X-UID: 12426 Markus wrote: > wonder if my little carrier might have contributed > some energy to the leftmost bin? Nothing showing above noise, 13:10 to 22:00 http://abelian.org/vlf/tmp/170821a.gif Stefan wrote: > That's already a nice peak! It looks interesting, although only about 3.5 sigma, needs a bit more work. > f = 4470.005000 Hz > Start time: 22.August.2017 04:00:00 UTC > Symbol period: 60 s > Characters: 5 > CRC bits: 6 > Coding 16K21A With this transmission, the optimum decoder list length will be about 40 for a full phase search, or about 120 if you decide the phase is constant enough to restrict the search to uniform phases. The chance of successful decode will then be about 60% at Eb/N0 of -1.0 dB. It doesn't do any harm to use a longer list than optimum, but there is no further coding gain. -- Paul Nicholson --