Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 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 tAO8R3Kl019405 for ; Tue, 24 Nov 2015 09:27:04 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a18o2-0004bT-BQ for rs_out_1@blacksheep.org; Tue, 24 Nov 2015 08:18:30 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a18o1-0004bK-OG for rsgb_lf_group@blacksheep.org; Tue, 24 Nov 2015 08:18:29 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a18mx-0007zt-GC for rsgb_lf_group@blacksheep.org; Tue, 24 Nov 2015 08:18:28 +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 CA5213273EB for ; Tue, 24 Nov 2015 08:08:20 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 164F628A0121 for ; Tue, 24 Nov 2015 08:17:07 +0000 (UTC) Message-ID: <56541D02.5010603@abelian.org> Date: Tue, 24 Nov 2015 08:17:06 +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: <565333DE.22216.1552AED@mike.dennison.ntlworld.com> In-Reply-To: X-Scan-Signature: 33d261536bb1467bb13d5764461d5ec4 Subject: Re: LF: VLF in VO 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: O X-Status: X-Keywords: X-UID: 5286 Joe VO1NA wrote: > An 8K19A sequence with 7 characters & 2 second long > symbols was started around 2300 (I hope). At 2330 I will > try to sync it against UT and send it again. For both messages I got an 'all-star' decode 23:00 found rank 0: ******* ps [ 8 -60 -60 -60 -60] re-encode 167/608 ber 2.75e-01 Es/N0=-7.4 Eb/N0=4.2 23:20 found rank 0: ******* ps [ 0 0 0 0 0] re-encode 1/608 ber 1.64e-03 Es/N0=6.4 Eb/N0=18.0 which means you were sending pure carrier. (The CRC16 isn't initialised to 0xffff as is usually done, instead zero so that a payload of all zeros encodes to all zeros and transmits/receives as a pure carrier). The signal at 23:20 was very strong, only one of the 608 symbols was demodulated incorrectly. > Next start time 0000 UTC 24 Nov. Also unmodulated carrier found rank 0: ******* ps [ 1 180 180 180 180] re-encode 1/608 ber 1.64e-03 Es/N0=6.4 Eb/N0=18.0 effrate=1/14.48 with again (suspiciously) just one symbol error. Checked: the 23:20 symbol error was at offset 283, the 00:00 was at 512. Something wrong with the modulator but the signal is huge. By the time it arrives here you've enough spare dB to cross another ocean. Once you've got things fettled we should try daylight path which would a better test of the mode. -- Paul Nicholson --