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=-0.8 required=5.0 tests=BAYES_00,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 sB18W5An001401 for ; Mon, 1 Dec 2014 09:32:05 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1XvMG9-0004Wo-2Z for rs_out_1@blacksheep.org; Mon, 01 Dec 2014 08:23:05 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1XvMG7-0004Wf-OR for rsgb_lf_group@blacksheep.org; Mon, 01 Dec 2014 08:23:03 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1XvMG5-00062k-Sf for rsgb_lf_group@blacksheep.org; Mon, 01 Dec 2014 08:23:02 +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 28D1F3273A3 for ; Mon, 1 Dec 2014 08:22:27 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 788A928A073F for ; Mon, 1 Dec 2014 08:23:00 +0000 (UTC) Message-ID: <547C2564.5010305@abelian.org> Date: Mon, 01 Dec 2014 08:23:00 +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: <547AB8D8.9060504@abelian.org> In-Reply-To: X-Scan-Signature: 5c335215f1b3de26d890ee84d49616ce Subject: Re: VLF: Experiments - anyone? 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: 1366 Spectrogram of W4DEX at Forest, VA (range 254km) through Mike Smith's receiver which is streamed over the Internet, http://abelian.org/vlf/tmp/141201a.png Appeared close to 8819.9 Hz then after the shutdown it came back up near 8820.0 Hz. The frequency was unstable, somewhere around 8819.9970 for a while but it also spent some time near 8819.9985. No chance of picking this up in Europe, although I did have a look at a 30 minute slot which seemed reasonably steady. But apart from this little problem with the frequency lock, the signal looks pretty good. Warren wrote: > Can you point me to the coherent BPSK software? I think so, Markus devised a way to send an encoded message using Spectrum Lab. It is necessary to arrange something like a DPDT relay to reverse the phase of the tx signal under control of Spectrum Lab. The PC needs reasonably good clock discipline (0.1 seconds or so) so that the bits are synchronous with UT and the carrier has to be GPS or Rubidium locked, or maybe from a very good OCXO. I'll dig out the details in a follow-up. -- Paul Nicholson --