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=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, 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 uAFDwY4N024724 for ; Tue, 15 Nov 2016 14:58:35 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1c6e8U-0008FU-Dr for rs_out_1@blacksheep.org; Tue, 15 Nov 2016 13:50:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1c6e8T-0008FL-Mg for rsgb_lf_group@blacksheep.org; Tue, 15 Nov 2016 13:50:53 +0000 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1c6e8N-0000pU-5N for rsgb_lf_group@blacksheep.org; Tue, 15 Nov 2016 13:50:52 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id CF62B20B3F for ; Tue, 15 Nov 2016 14:50:42 +0100 (CET) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3tJ80y4d4sz107R for ; Tue, 15 Nov 2016 14:50:42 +0100 (CET) Message-ID: <582B12B2.7080708@posteo.de> Date: Tue, 15 Nov 2016 14:50:42 +0100 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <154c32c4dba-373a-24653@webprd-m58.mail.aol.com> <573EA094.3040205@abelian.org> <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> In-Reply-To: <582AB6CD.5090603@abelian.org> X-Scan-Signature: c9d6a1e47761f7ec7375ac340bef30d0 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: 2683 Status: O X-Status: X-Keywords: X-UID: 9467 Hi Paul, Am 15.11.2016 08:18, schrieb Paul Nicholson: > Carrier (after phase modulation reversed) in 6uHz bandwidth > http://abelian.org/vlf/tmp/161115a.gif Very nice indeed! :-) I like the very long transmissions. Hopefully the phase between day and night is more equal on 5170 Hz and 2970 Hz. > http://abelian.org/vlf/tmp/161115c.gif Most impressing. This is something i would call "DFCW-20000", a FFT resolution for that mode. But the 15 characters would take several weeks in that mode and probably wouldn't even be identifiable during a day with high QRN. Am 14.11.2016 20:09, schrieb Paul Nicholson: > Start tomorrow with 50 chars? Currently i would like to continue with the ongoing daily repetition experiment. We are getting most interesting data of the daily path stability. So far 4 'events'. For a better statistical certainty i would like to get, say, 7 days, one week of coherent adding. We are in the comfortable situation to get a daily decode, so we can continue to write that table. Some day we may try an attempt to transfer a message that will not decode after days, so it would be a better feeling to know from our own experiments that we can stay optimistic. An experiment like that has not been done (that way) before. So it is good to see what happens for a few more days i think. The recent developed optimism leads us to the imagination that we can pass every message length on 46km, as long as the path is stable. We will show it! Currently, RN3AUS is running his setup on VLF, 8270 and 6470. He is running a 10 uHz spectrogram. I think i am to weak for that path in that BW. Also the path must be stable over the FFT time. But i should give it a try! It is also a try to leave a trace at Renato Romero / IK1QFK. So the plan is to run the experiment (daily repetition) until the 17th, 15:44 UTC (7 events). Then i will run a carrier for about 2 days without an interruption. Then i would start an attempt for the 20 character message, which was the mail goal defined in May 2016. And then finally i could start the 50 character message to complete the experiments on 6470 Hz. That is the idea. BTW it is raining today here. The antenna is detuned a bit and the antenna current drops, see http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/TX.png (this link always works if i am on air). So the SNR will be lower today. Anyway the result will be interesting! Looking forward to that. 73, Stefan PS: That is an issue for itselfe: If we can assume a LONG path is stable in its phase during a certain time, would it be possible to transfer an EbNaut message over > 10000 km? We need more stations in higher distances!