Return-Path: X-Spam-DCC: paranoid 1102; 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 tB9JSUWQ004545 for ; Wed, 9 Dec 2015 20:28:30 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a6kIU-0005St-4N for rs_out_1@blacksheep.org; Wed, 09 Dec 2015 19:21:06 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a6kIT-0005Sk-Sj for rsgb_lf_group@blacksheep.org; Wed, 09 Dec 2015 19:21:05 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a6kHP-0006YI-MY for rsgb_lf_group@blacksheep.org; Wed, 09 Dec 2015 19:21:04 +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 5DF3F3273A5 for ; Wed, 9 Dec 2015 19:10:36 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 5C17B28A0220 for ; Wed, 9 Dec 2015 19:19:38 +0000 (UTC) Message-ID: <56687ECA.20300@abelian.org> Date: Wed, 09 Dec 2015 19:19:38 +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: <8D300BD6499FC61-5AC-245382@webmail-vm125.sysops.aol.com> In-Reply-To: <8D300BD6499FC61-5AC-245382@webmail-vm125.sysops.aol.com> X-Scan-Signature: c1f72e5acb1277e013f90c915ad7ad68 Subject: Re: LF: VO1NA - carrier 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: 5687 VO1NA spectrum measured over the VK window 09:45 to 11:30 http://abelian.org/vlf/tmp/151209a.gif shows the carrier energy spread evenly across three bins and the S/N here is 14.5 dB. A non-coherent sum of three consecutive 476 uHz spectra produces http://abelian.org/vlf/tmp/151209b.gif where the S/N is now around 21 dB. Plot of carrier phase at an average frequency of 137776.999810 Hz, http://abelian.org/vlf/tmp/151209c.gif There's a few places where the phase seems to step 180 deg and this is probably where the signal fades out briefly and comes up in the opposite phase. If that happens in the middle of an EbNaut message it will have little chance of decoding. It might cope if the phase inversion is near one end or the other. -- Paul Nicholson --