Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w0UEpqVW024513 for ; Tue, 30 Jan 2018 15:51:55 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1egX9m-0003zn-Le for rs_out_1@blacksheep.org; Tue, 30 Jan 2018 14:45:06 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1egX9R-0003zc-D4 for rsgb_lf_group@blacksheep.org; Tue, 30 Jan 2018 14:44:45 +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 4.89) (envelope-from ) id 1egX9N-0006gt-TL for rsgb_lf_group@blacksheep.org; Tue, 30 Jan 2018 14:44:43 +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=JGbAgiyNgNeZG3Y+HxiAouQmv7Wo7U454KGlcwfvSR4=; b=Xt899UqbO7JlqPNF2kek5lJO5D gJH6nkUoyqjrGw2SwgLg4rIqssyitsqTlnJ9o9LaG3VX0hxz7eDlkyMoIuG8DXle7nOJAk1uoz5Bh H2stw+/efVCNhunIP5J2yY8185Ztm9AqYPhT/ZPqvPDQOEBb/zF6QOENlHP8KwdEu/dE=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:54006 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1egX9M-0008FH-2L for rsgb_lf_group@blacksheep.org; Tue, 30 Jan 2018 14:44:40 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 5F0CD4000D5 for ; Tue, 30 Jan 2018 14:44:39 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <160a7a62949-171d-2f322@webjas-vae049.srv.aolmail.net> <8da80498-5842-a9e5-9fbb-e4bdc4cd2b12@abelian.org> <588f41b6-23fc-9dca-3056-595a8a534c59@abelian.org> <5A561089.1040600@posteo.de> <860ab20f-388f-0d71-4d62-e4a804616e04@abelian.org> <1UQMAnbg62.1ffXqtU77ek@optiplex980-pc> <5a00658e-4613-2dad-2801-93f925ac0416@abelian.org> <2492720b-329b-7888-673b-c7946a55be53@abelian.org> <487f1664-cfc1-aec2-153f-ef5b50c16197@abelian.org> <17a9b5c2-cccf-36a1-517d-165bb7b418df@abelian.org> From: Paul Nicholson Message-ID: <29f84d3f-d260-ab39-6dce-b4dcb6cbac54@abelian.org> Date: Tue, 30 Jan 2018 14:44:39 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US 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-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: VO1NA wrote: > Stefan has suggested a longer CRC might be helpful. > Should I give this a try? Worth a try. One advantage: if you only have one or two characters to send, with say 8 bit CRC, the Viterbi payload is only 20 bits which doesn't make for a strong coding. By using a longer CRC you can pad this out, eg to 36 bits. This means you can use a stronger coding eg 16K23A, plus there is more discrimination (in terms of path metric) in the Viterbi layer between real and false hits. Also you may choose to use less than optimum list length to get less chance of a false decode. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: e57013951ca4c86ddcf48e741efd2b78 Subject: Re: LF: VLF NA Ebnaut Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS autolearn=no version=2.63 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 VO1NA wrote: > Stefan has suggested a longer CRC might be helpful. > Should I give this a try? Worth a try. One advantage: if you only have one or two characters to send, with say 8 bit CRC, the Viterbi payload is only 20 bits which doesn't make for a strong coding. By using a longer CRC you can pad this out, eg to 36 bits. This means you can use a stronger coding eg 16K23A, plus there is more discrimination (in terms of path metric) in the Viterbi layer between real and false hits. Also you may choose to use less than optimum list length to get less chance of a false decode. > Have the daytime transmissions been decoded? Daytime signal is received well in UK but not so good in Europe. Some days carrier was sent instead of EbNaut. *Carrier* indicates the '*' message decoded from the carrier with the same message settings. Todmorden (3575 km) ------------------- 10 Eb/N0 11.6 dB, S/N -26.0 dB/1Hz, phase -74.7 *Decoded* 11 Eb/N0 7.0 dB, S/N -30.6 dB/1Hz, phase -76.6 *Decoded* 12 Eb/N0 -3.2 dB, S/N -40.8 dB/1Hz, phase 83.8; 13 Eb/N0 -5.3 dB, S/N -42.8 dB/1Hz, phase -86.7; 14 Eb/N0 -6.3 dB, S/N -44.0 dB/1Hz, phase -107.5; 15 Eb/N0 +7.9 dB, S/N -29.6 dB/1Hz, phase 105.4 *Carrier* 16 Eb/N0 -4.3 dB, S/N -41.9 dB/1Hz, phase 139.5; 17 Eb/N0 +7.6 dB, S/N -30.0 dB/1Hz, phase 122.7 *Carrier* 18 Eb/N0 +2.9 dB, S/N -34.7 dB/1Hz, phase 85.7 *Carrier* 19 Eb/N0 +9.3 dB, S/N -28.3 dB/1Hz, phase 117.9 *Carrier* 20 Eb/N0 +10.9 dB, S/N -26.7 dB/1Hz, phase 112.1 *Carrier* 21 Eb/N0 +10.1 dB, S/N -27.5 dB/1Hz, phase -63.4 *Decoded* 22 Eb/N0 +0.2 dB, S/N -37.3 dB/1Hz, phase -73.3 *Decoded* 23 Eb/N0 +7.0 dB, S/N -30.6 dB/1Hz, phase -55.4 *Decoded* 24 Eb/N0 +3.2 dB, S/N -34.3 dB/1Hz, phase -53.5 *Decoded* 25 Eb/N0 +9.6 dB, S/N -28.0 dB/1Hz, phase -73.4 *Decoded* 26 Eb/N0 +15.3 dB, S/N -22.3 dB/1Hz, phase -91.1 *Decoded* 27 Eb/N0 +8.8 dB, S/N -28.8 dB/1Hz, phase -75.1 *Decoded* 28 Eb/N0 +8.3 dB, S/N -29.3 dB/1Hz, phase -82.1 *Decoded* 29 Eb/N0 +10.2 dB, S/N -27.4 dB/1Hz, phase -96.4 *Decoded* Bielefeld (4301.5 km DL4YHF) ---------------------------- 10 Eb/N0 -1.1 dB, S/N -38.6 dB/1Hz, phase 122.9; 11 Eb/N0 +1.7 dB, S/N -35.9 dB/1Hz, phase 70.2 *Decoded* 12 Eb/N0 -8.1 dB, S/N -64.4 dB/1Hz; 13 Eb/N0 -10.4 dB, S/N -48.0 dB/1Hz; 14 Eb/N0 -11.2 dB, S/N -48.8 dB/1Hz; 15 Eb/N0 -13.2 dB, S/N -50.8 dB/1Hz, phase -22.0; 16 Eb/N0 -10.4 dB, S/N -48.0 dB/1Hz; 17 Eb/N0 -3.2 dB, S/N -40.8 dB/1Hz, phase -77.6; 18 Eb/N0 -14.8 dB, S/N -52.4 dB/1Hz, phase 27.2; 19 Eb/N0 -0.6 dB, S/N -38.1 dB/1Hz, phase -16.8; 20 Eb/N0 -2.8 dB, S/N -40.4 dB/1Hz, phase -9.6; 21 Eb/N0 -10.5 dB, S/N -48.0 dB/1Hz; 22 Eb/N0 -6.5 dB, S/N -44.1 dB/1Hz, phase -49.3; 23 Eb/N0 -14.3 dB, S/N -51.9 dB/1Hz; 24 Eb/N0 -16.7 dB, S/N -54.3 dB/1Hz; 25 Eb/N0 -10.8 dB, S/N -48.3 dB/1Hz, phase 28.8; 26 Eb/N0 -3.1 dB, S/N -40.7 dB/1Hz, phase 85.4; 27 Eb/N0 -2.2 dB, S/N -39.8 dB/1Hz, phase 85.7; 28 Eb/N0 -5.1 dB, S/N -42.7 dB/1Hz, phase 125.9; 29 Eb/N0 -4.7 dB, S/N -42.3 dB/1Hz, phase 113.2; Cumiana (4533.4 km IK1QFK) -------------------------- 10 Eb/N0 -5.0 dB, S/N -42.6 dB/1Hz, phase -6.4; 11 Eb/N0 -4.7 dB, S/N -42.3 dB/1Hz, phase 90.1; 12 Eb/N0 -14.5 dB, S/N -52.0 dB/1Hz; 13 Eb/N0 -3.3 dB, S/N -40.9 dB/1Hz, phase 177.7; 14 Eb/N0 -1.8 dB, S/N -39.4 dB/1Hz, phase -50.4; 15 Eb/N0 -4.4 dB, S/N -42.0 dB/1Hz, phase -133.6; 16 Eb/N0 -3.9 dB, S/N -41.5 dB/1Hz, phase -96.2; 17 Eb/N0 -3.3 dB, S/N -40.9 dB/1Hz, phase -120.5; 18 Eb/N0 -2.8 dB, S/N -40.4 dB/1Hz, phase -153.7; 19 Eb/N0 -3.5 dB, S/N -41.1 dB/1Hz, phase -83.3; 20 Eb/N0 -6.7 dB, S/N -44.2 dB/1Hz, phase -121.3; 21 Eb/N0 -0.5 dB, S/N -38.1 dB/1Hz, phase -73.0; 22 Eb/N0 -7.2 dB, S/N -44.8 dB/1Hz, phase -95.5; 23 Eb/N0 -7.8 dB, S/N -45.4 dB/1Hz, phase 68.5; 24 Eb/N0 -16.1 dB, S/N -53.7 dB/1Hz; 25 Eb/N0 -22.7 dB, S/N -60.3 dB/1Hz; 26 Eb/N0 +1.7 dB, S/N -35.9 dB/1Hz, phase 114.7 *Decoded* 27 Eb/N0 -13.5 dB, S/N -51.1 dB/1Hz; 28 Eb/N0 -3.1 dB, S/N -40.7 dB/1Hz, phase 79.2; 29 Eb/N0 -8.8 dB, S/N -46.4 dB/1Hz, phase 159.8; Forest, VA (2415.3 km KE4RJQ) ----------------------------- 10 Eb/N0 -1.0 dB, S/N -38.6 dB/1Hz, phase -23.2; 11 Eb/N0 -6.0 dB, S/N -43.6 dB/1Hz, phase -39.7; 12 Eb/N0 -1.5 dB, S/N -39.0 dB/1Hz, phase -126.5; 13 Eb/N0 -3.1 dB, S/N -40.7 dB/1Hz, phase 60.3; 14 Eb/N0 -7.1 dB, S/N -44.7 dB/1Hz, phase -147.7; 15 Eb/N0 -26.4 dB, S/N -64.0 dB/1Hz; 16 Eb/N0 -6.8 dB, S/N -44.4 dB/1Hz, phase 131.4; 17 Eb/N0 -12.4 dB, S/N -50.0 dB/1Hz; 18 Eb/N0 -5.5 dB, S/N -43.1 dB/1Hz, phase 154.8; 19 Eb/N0 -4.7 dB, S/N -42.3 dB/1Hz, phase 178.6; 20 Eb/N0 -18.2 dB, S/N -55.8 dB/1Hz; 21 Eb/N0 -6.1 dB, S/N -43.7 dB/1Hz, phase -65.9; 22 Eb/N0 -5.6 dB, S/N -43.2 dB/1Hz, phase -135.4; 23 Eb/N0 -3.7 dB, S/N -41.3 dB/1Hz, phase -34.7; 24 Eb/N0 -4.6 dB, S/N -42.1 dB/1Hz, phase -140.0; 25 Eb/N0 -10.8 dB, S/N -48.4 dB/1Hz, phase -44.5; 26 Eb/N0 -5.3 dB, S/N -42.8 dB/1Hz, phase 19.7; 27 Eb/N0 -4.2 dB, S/N -41.8 dB/1Hz, phase 28.7; 28 Eb/N0 -6.3 dB, S/N -43.9 dB/1Hz, phase 141.2; 29 Eb/N0 -3.4 dB, S/N -40.9 dB/1Hz, phase -103.9; Hawley, TX (4240.3 km) ---------------------- 10 Eb/N0 -23.4 dB, S/N -61.0 dB/1Hz; 11 Eb/N0 -3.8 dB, S/N -41.4 dB/1Hz, phase -135.5; 12 Eb/N0 -7.4 dB, S/N -45.0 dB/1Hz, phase 66.3; 13 Eb/N0 -3.8 dB, S/N -41.4 dB/1Hz, phase -72.7; 14 Eb/N0 -14.8 dB, S/N -52.4 dB/1Hz; 15 Eb/N0 -16.1 dB, S/N -53.7 dB/1Hz; 16 Eb/N0 -5.8 dB, S/N -43.4 dB/1Hz, phase 92.2; 17 Eb/N0 -0.7 dB, S/N -38.3 dB/1Hz, phase 5.1; 18 Eb/N0 -7.0 dB, S/N -44.6 dB/1Hz, phase -128.4; 19 Eb/N0 -8.9 dB, S/N -46.5 dB/1Hz, phase 13.6; 20 Eb/N0 -6.8 dB, S/N -44.4 dB/1Hz, phase -172.5; 21 Eb/N0 -4.2 dB, S/N -41.8 dB/1Hz, phase 162.0; 22 Eb/N0 -8.5 dB, S/N -46.0 dB/1Hz, phase 111.8; 23 Eb/N0 -11.6 dB, S/N -49.1 dB/1Hz; 24 Eb/N0 -4.1 dB, S/N -41.7 dB/1Hz, phase 170.9; 25 Eb/N0 -3.0 dB, S/N -40.5 dB/1Hz, phase -118.8; 26 Eb/N0 No uplink; 27 Eb/N0 -0.7 dB, S/N -38.3 dB/1Hz, phase 179.2; 28 Eb/N0 -3.7 dB, S/N -41.3 dB/1Hz, phase -119.7; 29 Eb/N0 -5.3 dB, S/N -42.8 dB/1Hz, phase 41.5; -- Paul Nicholson --