Return-Path: X-Spam-DCC: paranoid 1233; 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 tB5N0KO8020744 for ; Sun, 6 Dec 2015 00:00:20 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a5LlS-0000Vd-UB for rs_out_1@blacksheep.org; Sat, 05 Dec 2015 22:57:14 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a5LlS-0000VU-7Y for rsgb_lf_group@blacksheep.org; Sat, 05 Dec 2015 22:57:14 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a5LkX-0006fV-Ep for rsgb_lf_group@blacksheep.org; Sat, 05 Dec 2015 22:57:13 +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 C68093273A5 for ; Sat, 5 Dec 2015 22:46:59 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id B795528A0168 for ; Sat, 5 Dec 2015 22:55:56 +0000 (UTC) Message-ID: <56636B7C.8000608@abelian.org> Date: Sat, 05 Dec 2015 22:55:56 +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: <5662352D.6050609@abelian.org> <8D2FD5A5840B109-1CBC-D5B38@webmail-vd007.sysops.aol.com> <5662CC47.3030007@abelian.org> <5662FD4F.50104@abelian.org> <566305CF.4020407@abelian.org> <56631F93.7040505@abelian.org> <5663384D.9080401@abelian.org> In-Reply-To: X-Scan-Signature: 66d07794ca19cd68f7d6cc289cd4ac18 Subject: Re: LF: More EbNaut 137.777 - TA slot 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: 5594 Joe wrote: > I'll keep it going then. Maybe the battery here will hold up for another night. This signal could be detectable at long distance except that several dB will be lost unless the rx can correctly guess the frequency offset. Here I am cheating because the message is known and I use it to undo the modulation and get a nice clean carrier to measure. Reversing the modulation is easy, I just pass the whole band through a BPSK modulator and then plot the spectrum. You get a nice clean band - all other signals are smeared out and reduced. For example http://abelian.org/vlf/tmp/151205c.gif VO1NA is at 0Hz and is +/- 0.2Hz wide due to the BPSK. After the entire band is modulated, VO1NA sharpens to a carrier and unrelated signals are spread out. I don't know what's causing those 3.05Hz sidebands of VO1NA. What could they be? > There seems to be a jump after local noon. The strong signal at 13:30 was a surprise, about 6dB or so more than I expected. VO1NA 2015-12-05 16K21A 5S 5C QRO start Eb/N0 Freq 13:30 13.0 -222 uHz 15:00 3.1 -256 uHz 16:30 3.9 -482 uHz 18:00 15.1 -558 uHz 19:30 17.3 -228 uHz 21:00 14.2 -330 uHz The big unknown is how much of this frequency shift is oscillator and how much is propagation. -- Paul Nicholson --