Return-Path: X-Spam-DCC: paranoid 1169; 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=-2.6 required=5.0 tests=BAYES_00 autolearn=unavailable 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 t06CJPm9011147 for ; Tue, 6 Jan 2015 13:19:25 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y8T0N-0006mg-IX for rs_out_1@blacksheep.org; Tue, 06 Jan 2015 12:12:59 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y8T0N-0006mX-5j for rsgb_lf_group@blacksheep.org; Tue, 06 Jan 2015 12:12:59 +0000 Received: from mout.gmx.net ([212.227.17.20]) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1Y8T0K-0003eV-MJ for rsgb_lf_group@blacksheep.org; Tue, 06 Jan 2015 12:12:58 +0000 Received: from Clemens0811 ([79.237.160.186]) by mail.gmx.com (mrgmx102) with ESMTPSA (Nemesis) id 0M1zFf-1XneAO0kCh-00u12z for ; Tue, 06 Jan 2015 13:12:55 +0100 From: "Clemens Paul" To: References: <54AB0110.3030709@abelian.org> <013401d02939$14569e40$3d03dac0$@comcast.net> <54ABA271.9060201@abelian.org> <54ABCE89.8010705@abelian.org> In-Reply-To: <54ABCE89.8010705@abelian.org> Date: Tue, 6 Jan 2015 13:12:56 +0100 Message-ID: <66A0375B9A78459CBEFF333DD8DCB5DE@Clemens0811> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 Thread-Index: AdApqM1WP/S0S+MfSZmG+ZO+8J4TlgAARgvA X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 X-Provags-ID: V03:K0:L2v+7i8GXrXOk/gXI9fEdK8KkzbbLyjpxASucQaoW8B+pNqInWB /vjoqKvOnltG4jrke2J3xoSl5igd2zxlXY7LAm8go54bf2qrcvM38TS/52bUByePDIM67LW Lvm/kg3NKdiJplxW617FIdr0uGyjADyiYoZFGDgs4tpdyBZ2QjTFm603yGa3BgqNQKvq9We 3rHt22o3QzvvkZzIwW20w== X-UI-Out-Filterresults: notjunk:1; X-Scan-Signature: 046f068074e745d5c60ca47deee9b503 Subject: RE: VLF: Transatlantic messages at 8822Hz Content-Type: text/plain; charset="us-ascii" 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: 1823 >Without undoing the modulation, the signal is spread over a bandwidth >of about 0.125Hz and is completely invisible. I believe the word 'undoing' should be omitted? 73 Clemens DL4RAJ >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson >Sent: Tuesday, January 06, 2015 1:01 PM >To: rsgb_lf_group@blacksheep.org >Subject: Re: VLF: Transatlantic messages at 8822Hz > > >I made a spectrogram from the reconstructed carrier >(the BPSK modulation removed by undoing the phase reversals). > > http://abelian.org/vlf/tmp/150106a.png > >The bin bandwidth is set to the bandwidth of the information >bits. I think this demonstrates quite dramatically the strength >of the forward error correction coding. > >It is remarkable and quite fascinating that 150 bits of information >can be obtained error-free from that feeble looking trace on the >spectrogram. > >Without undoing the modulation, the signal is spread over a bandwidth >of about 0.125Hz and is completely invisible. > >-- >Paul Nicholson >http://abelian.org/ >-- >