Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS 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+deb8u1) with ESMTP id uBRCGYXS024169 for ; Tue, 27 Dec 2016 13:16:36 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cLqcu-0005BP-Du for rs_out_1@blacksheep.org; Tue, 27 Dec 2016 12:13:08 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cLqct-0005BG-QH for rsgb_lf_group@blacksheep.org; Tue, 27 Dec 2016 12:13:07 +0000 Received: from gmy2-mh862.smtproutes.com ([94.186.192.191]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1cLqcq-0007hm-Ny for rsgb_lf_group@blacksheep.org; Tue, 27 Dec 2016 12:13:06 +0000 X-Katharion-ID: 1482840773.16576.gmy2-mh862 Received: from servigilant.vigilant.es ([87.216.178.132]) by gmy2-mh862.smtproutes.com [(94.186.192.191)] with ESMTP via TCP (TLSv1/TLS_RSA_WITH_AES_256_CBC_SHA); 27 Dec 2016 12:12:53 +0000 Received: from servigilant.vigilant.local ([fe80::c40d:8140:d722:5448]) by servigilant.vigilant.local ([fe80::c40d:8140:d722:5448%16]) with mapi id 14.03.0123.003; Tue, 27 Dec 2016 13:12:47 +0100 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: Article on forward error correction Thread-Index: AQHSX0wj6yipZeqZO0+UG6Sx/mSS4aEbtFHw Date: Tue, 27 Dec 2016 12:12:45 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB5D88CC27@servigilant.vigilant.local> In-Reply-To: <5860C842.90809@abelian.org> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.2] MIME-Version: 1.0 X-Scan-Signature: 3f8d74a8c70dd416d0a3a1dbcb9bb89f Subject: LF: RE: Article on forward error correction Content-Type: text/plain; charset="iso-8859-1" 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by lipkowski.org id uBRCGYXS024169 Status: O X-Status: X-Keywords: X-UID: 9970 Thank you very much for the article Paul I have resend your message to the MoonBounce reflector. Most of the hams are using digital modes in Earth-Moon-Earth communications and recently new modes as QRA64 have been developed. Unfortunately only a very small fraction can really understand what is all this stuff about (me not included there) :-) You can only say to really understand something, when you are able to explain it to your Grandma ;-) 73 de Luis EA5DOM -----Mensaje original----- De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de Paul Nicholson Enviado el: lunes, 26 de diciembre de 2016 8:36 Para: rsgb_lf_group@blacksheep.org Asunto: LF: Article on forward error correction I wrote a non-mathematical introductory article about how forward error correction works. There's a lot of material on the web about FEC but most of it is very technical and tends to concentrate on one or another particular coding scheme. I couldn't find anything that demonstrates and really explains in simple terms the essential principle of it. So I thought I'd try to write something, perhaps to see if I can understand it myself. The article should appeal to anyone who's wondered how 'coding' a message, which increases its bandwidth and reduces its S/N, can actually lead to greatly improved communications. http://abelian.org/fec/pn161218/ or in pdf format http://abelian.org/fec/pn161218.pdf Whether I've succeeded or not, the reader will have to judge. -- Paul Nicholson --