Return-Path: X-Spam-DCC: paranoid 1233; Body=3 Fuz1=3 Fuz2=3 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 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 tBVH9Ggo024405 for ; Thu, 31 Dec 2015 18:09:16 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aEgfk-0001eq-Pc for rs_out_1@blacksheep.org; Thu, 31 Dec 2015 17:05:56 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aEgfk-0001eh-Hn for rsgb_lf_group@blacksheep.org; Thu, 31 Dec 2015 17:05:56 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1aEgeh-0004ey-Jq for rsgb_lf_group@blacksheep.org; Thu, 31 Dec 2015 17:05:55 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 2D5633273D6 for ; Thu, 31 Dec 2015 16:54:57 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id ACD6128A010E for ; Thu, 31 Dec 2015 17:04:35 +0000 (UTC) Message-ID: <56856023.4050706@abelian.org> Date: Thu, 31 Dec 2015 17:04:35 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Scan-Signature: 7aa9ad08848e488e22e0ff1d71f4ef1d Subject: Re: LF: Coherent Comms on 475kHz Content-Type: text/plain; charset=ISO-8859-1; 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 10.1.3.10 Status: RO X-Status: X-Keywords: X-UID: 6037 Andy wrote: > were any coherent tests / EbNaut type experiments > done on 475kHz? Markus and Domenico on 2015-11-15 8K19A 22 chars 0.3 second symbols. Then some tests with 0.5 seconds 16 chars were successful the next night. Signals were too strong for a good test, too much Eb and not enough N0. A lot of fading though which put the interleaving to test. MF might be good territory for further experiments, using shorter symbols, wider bandwidth, less stress on oscillator stability and bit clock accuracy more important. -- Paul Nicholson --