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 u2EJAUhh017208 for ; Mon, 14 Mar 2016 20:10:30 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1afXoh-0006wg-7y for rs_out_1@blacksheep.org; Mon, 14 Mar 2016 19:06:11 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1afXog-0006wX-Vt for rsgb_lf_group@blacksheep.org; Mon, 14 Mar 2016 19:06:10 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1afXof-0005tq-8a for rsgb_lf_group@blacksheep.org; Mon, 14 Mar 2016 19:06:09 +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 56D193273ED for ; Mon, 14 Mar 2016 19:06:01 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id BF9E528A020E for ; Mon, 14 Mar 2016 19:06:07 +0000 (UTC) Message-ID: <56E70B9F.9080706@abelian.org> Date: Mon, 14 Mar 2016 19:06:07 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <5ef785f5c0d5425ebb3970a52fbf1eb3@kabelmail.de> <56E6FFAD.7080804@abelian.org> In-Reply-To: <56E6FFAD.7080804@abelian.org> X-Scan-Signature: e6de17d69e46ff4ea8db042ef2cd7e46 Subject: Re: LF: 8270Hz 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7352 Uwe wrote: > can I get somehow your 8270Hz .WAV file from today I made three WAV files suitable for input to ebnaut-rx (the header contains frequency and time info). All files begin 02:59:00 and decode with a start offset of 60.00 Various sample rates and file sizes: 30 samples/sec 2.8 Mbyte Eb/N0 = 1.0 dB http://abelian.org/vlf/tmp/dj8wx_160314_30.wav 10 samples/sec 936 Kbyte Eb/N0 = 0.6 dB http://abelian.org/vlf/tmp/dj8wx_160314_10.wav 1 samples/sec 96 Kbyte Eb/N0 = 0.4dB http://abelian.org/vlf/tmp/dj8wx_160314_1.wav I notice that the error rate increases a little as I reduce the bandwidth. Here I usually decode from a rate 240 samples/sec and got Eb/N0 = 1.2 dB but it's down to 0.4 dB after resampling to the lowest rate. I'm not sure why that is. > the carrier is on. Amplitude and phase plotted in 5 minute steps http://abelian.org/vlf/tmp/160314b.gif Some pretty wild variations of phase but it settles down from about 02:00 onwards. I tried to decode the earlier carrier as an 'all-star' message, but without success at symbol length 10 seconds. -- Paul Nicholson --