Return-Path: X-Spam-DCC: paranoid 1480; 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,SPF_PASS 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 uAFGYws2025045 for ; Tue, 15 Nov 2016 17:34:58 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1c6gd2-0000S4-Kv for rs_out_1@blacksheep.org; Tue, 15 Nov 2016 16:30:36 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1c6gd1-0000Rv-PS for rsgb_lf_group@blacksheep.org; Tue, 15 Nov 2016 16:30:35 +0000 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1c6gcu-0001MT-PJ for rsgb_lf_group@blacksheep.org; Tue, 15 Nov 2016 16:30:34 +0000 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=KUjq1VFNXtIEhCldfTnlGjTXCR+KrwfySDMAFc4GhSM=; b=IFrGhnNyYW3VhRgO2czvUValpV B8EEIXOh3cLtsYAeSaKvBt2lQrb/PsW9isdRQIUCLYK99R6oSdVfL3CfweYU0bdYIP9lH5c1Xy9aw ryTE9PNVGhItLoRBC57jWHKjuv6LHOhhEkc9YVmkTjJblJoLiAg2PkMp8cP2ZzkgC/1s=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:44411 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1c6gct-0006EU-Tn for rsgb_lf_group@blacksheep.org; Tue, 15 Nov 2016 16:30:27 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 3CA40400238 for ; Tue, 15 Nov 2016 16:30:27 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <154c32c4dba-373a-24653@webprd-m58.mail.aol.com> <573EF90F.1080201@posteo.de> <573FC4DA.3080107@abelian.org> <5740842D.3030000@posteo.de> <5744FA27.6010703@posteo.de> <57F56531.3060205@posteo.de> <5817DE39.9010506@posteo.de> <5818DDAB.7000804@abelian.org> <5819E3AA.3020906@posteo.de> <581A452F.6060506@abelian.org> <581A4BC6.9030106@abelian.org> <581A541E.9050406@abelian.org> <581A8098.8050909@posteo.de> <581C3027.8050003@abelian.org> <581C8660.1070709@posteo.de> <581C90C7.5030809@abelian.org> <581C95BC.6010602@posteo.de> <581DA8E4.5010701@abelian.org> <581DB9C0.10602@posteo.de> <581DCF2E.5090902@abelian.org> <581F9797.9060709@abelian.org> <5824A47D.3060108@posteo.de> <58260EC4.70903@abelian.org> <58261368.60901@posteo.de> <58261772.3050508@abelian.org> <5826BF91.6070907@abelian.org> <5826DB6E.1060000@abelian.org> <58276523.4000204@abelian.org> <5829D9E1.2020801@posteo.de> <582A0BF2.5070101@abelian.org> <582AB6CD.5090603@abelian.org> <582B12B2.7080708@posteo.de> From: Paul Nicholson Message-ID: <582B3823.8090504@abelian.org> Date: Tue, 15 Nov 2016 16:30:27 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <582B12B2.7080708@posteo.de> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org X-Scan-Signature: 4b5b5ebe37a4c4f430f59bc35c1947b0 Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz Content-Type: text/plain; charset=utf-8; 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 10.1.3.11 Content-Length: 1467 Status: O X-Status: X-Keywords: X-UID: 9468 The recent 'TEST' messages are decoding very well at Bielefeld, range 301.7km. From the online recording of Wolf's vlf6 E-field receiver Eb/N0 S/N Phase 2016-11-11 5.7 -59.4 -42.5 2016-11-12 4.3 -60.5 -36.3 2016-11-13 8.5 -55.1 -37.2 2016-11-14 6.7 -58.1 -34.1 2016-11-15 5.0 -59.8 -38.1 All with constant reference phase, and the decoder is working on a copy of the signal which has been through a stage of vorbis compression/decompression. No normalisation used. The signal processing pipeline for the above goes like vtread -T2016-11-11_08:00,+27900 /raw1/vlf6 | vtcat -p | vtfilter -ath=5,ul=6400 -h bp,f=7900,w=3000 -h bs,f=6400,w=60 | vtblank -a2.0 -d0 -t1 | vtmult -f 6470 | vtresample -r240 | vtresample -r1 | vtraw -oa | ebnaut -dp8K19A -r1 -S60 -N4 -L15000 -c4 -PS -v vtread extracts the raw signal from the 20 day loop of signal from Bielefeld stored on my VLF stream server in Germany. The vtcat -p is necessary to pad with zeros the gaps produced by occasional interrupts of the vlf6 vorbis uplink. vtfilter is applying an auto hum notch up to 6.4 kHz, band pass centered 7900 +/- 1500 and a band stop 6400 +/- 30 vtmult mixes down to baseband I/Q. Two stages of resampling because vtresample won't do a large ratio in one step. vtraw -oa converts to three column ASCII for the decoder input. Now to try Cumiana vlf15 ... -- Paul Nicholson --