Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS,SUBJ_ALL_CAPS 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 v49CrSMq000492 for ; Tue, 9 May 2017 14:53:29 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d84ZS-0005pW-AZ for rs_out_1@blacksheep.org; Tue, 09 May 2017 13:48:54 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d84Yt-0005pN-7T for rsgb_lf_group@blacksheep.org; Tue, 09 May 2017 13:48:19 +0100 Received: from simone.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1d84Yp-00051U-2o for rsgb_lf_group@blacksheep.org; Tue, 09 May 2017 13:48:17 +0100 Received: from plato.ucs.mun.ca (plato.ucs.mun.ca [134.153.232.153]) by simone.ucs.mun.ca (8.13.8/8.13.8) with ESMTP id v49Cm9jK015179 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 9 May 2017 10:18:10 -0230 Date: Tue, 9 May 2017 10:18:09 -0230 (NDT) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: rsgb_lf_group@blacksheep.org In-Reply-To: Message-ID: References: <579355A36AEE9D4FA555C45D556003AB8FDD9B58@servigilant.vigilant.local> MIME-Version: 1.0 X-Scan-Signature: d7fcd9b75df8d1b09ddef9df028bd9ae Subject: Re: LF: NA VLF Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed 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: RO X-Status: X-Keywords: X-UID: 11645 Your efforts are greatly appreciated, Paul, along with the kind words and motivation from Stefan DK7FC Markus DF6NM Marco IK1HSS and Luis EA5DOM. The TX has been QRV since Sunday afternoon and is still going. The drift is interesting -- but not desirable. It is time to look at Spectrum lab again and explore some ideas to increase the ERP. Joe VO1NA On Tue, 9 May 2017, Paul Nicholson wrote: > > I can't detect any signal from Joe last night > 8th/9th 22:00 to 04:00, not a trace - perhaps > the tx has gone off. > > After sweeping for optimum settings, I couldn't get > much improvement. > > Daytime reception, S/N = 13.5 dB in 23.148 uHz: > > http://abelian.org/vlf/tmp/170509a.png > > Some of the energy is in adjacent bins on this 12 > hour integration, the frequency probably drifted > a little, losing a dB or so. > > Nighttime, S/N = 14.3 dB in 46.296 uHz: > > http://abelian.org/vlf/tmp/170509b.png > > Tried an EbNaut 'decode' of the 6 hour nighttime > signal. Unmodulated carrier is a valid message which > decodes to a string of '*' characters. Because of the > linearity of the coding, the performance is representative > of any other message with the same settings. > > 4 chars 16K25A CRC=12 Symbols = 22 seconds, duration 05:52:00 > gives > > rank 946 ber 42.2% '****' > > carrier Eb/N0: -0.1 dB > carrier S/N: 13.53 dB in 47.3 uHz, > -29.72 dB in 1Hz, > -63.70 dB in 2.5kHz > > The snag is, this 'decode' is only possible because I could > see the signal and measure its frequency. A real EbNaut > message is invisible and if the frequency is out by more than > about 5uHz it will not decode. > > 5 chars should just be possible but I could not get it to > decode. > -- > Paul Nicholson > -- > >