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,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: INFN-TO: mailn 1233; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mailn.lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id uB3GOOR3001703 for ; Sat, 3 Dec 2016 17:24:25 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cDD3P-0006rB-Fm for rs_out_1@blacksheep.org; Sat, 03 Dec 2016 16:20:47 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cDD3P-0006r2-0n for rsgb_lf_group@blacksheep.org; Sat, 03 Dec 2016 16:20:47 +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 4.87) (envelope-from ) id 1cDD3M-0000MJ-Jo for rsgb_lf_group@blacksheep.org; Sat, 03 Dec 2016 16:20:45 +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=Hy6iZAUh4nBh/g8MJdtW1RzovjGh9eAfVfZ9R9Zrzfc=; b=InX167RF7AfF85lnhpqXByYCJw vrbEMmH8ZXUwZ56h7JVCgbwSXb4RSRRB4Wgry+MJyAq762/KxHkaH8c1+IGO4hPz6Mg6WufFszfX3 wUO0knd0ItpaL9NXUZ/h7ZrJTApD2wV8D+XpFId4o0tZf+uEIzMcM1Jz9xhy8uPsr1ms=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:53409 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cDD3K-0005EF-8r for rsgb_lf_group@blacksheep.org; Sat, 03 Dec 2016 16:20:43 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 4AFE94007FF for ; Sat, 3 Dec 2016 16:20:38 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <158c17dc012-1cbc-28d9@webprd-a15.mail.aol.com> From: Paul Nicholson Message-ID: <5842F0D6.90805@abelian.org> Date: Sat, 3 Dec 2016 16:20:38 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: 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: e90dcb17768c7e768f13e0721cc1c0c7 Subject: Re: LF: EbNaut 137.477 kHz 1 Dec 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: 9665 Nice work Joe and Domenico. Thanks for linking the wav files, I downloaded and reproduced the three decodes using the Linux decoder to get exactly the same results. I wanted to see if normalising for amplitude variation made any difference with the LF signals. It didn't, the background noise is very constant so there is negligible normalisation effect. > not bad for a message of 63 characters on LF sent in less > than 30 minutes ! The 02:00 decode: -39.6dB in audio bandwidth, 2.3 characters per minute, 62% of channel capacity. Domenico, if you want to upload the unsuccessful wavs, I can check them to see how far short of a decode they were. -- Paul Nicholson --