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=-0.7 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 u4FHCDsN030875 for ; Sun, 15 May 2016 19:12:13 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b1zXF-0000Dw-7v for rs_out_1@blacksheep.org; Sun, 15 May 2016 18:08:57 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b1zXE-0000Dm-Nm for rsgb_lf_group@blacksheep.org; Sun, 15 May 2016 18:08:56 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1b1zXD-0006D9-28 for rsgb_lf_group@blacksheep.org; Sun, 15 May 2016 18:08:55 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 4C2812091F for ; Sun, 15 May 2016 19:08:52 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3r796X18HQz5vNM for ; Sun, 15 May 2016 19:08:51 +0200 (CEST) Message-ID: <5738AD23.1030300@posteo.de> Date: Sun, 15 May 2016 19:08:51 +0200 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: <40b8e5c6692149a7911fe77631ebb33b@kabelmail.de> <572BB679.2040107@posteo.de> <572BE449.5010806@abelian.org> <279E0DEFDAFA4C849152DBBA3BFEDE8C@White> <572C5E72.7010404@posteo.de> <912731037.20160506233059@mterrier.net> <572D1111.9030302@posteo.de> <572D9843.7060402@abelian.org> <572DBBD3.3020709@posteo.de> <572DC660.5050007@abelian.org> <572E4BF7.1060103@posteo.de> <572F9120.2010200@abelian.org> <5732F442.2050105@posteo.de> <5732F9E8.1090604@abelian.org> <57343F5D.5030502@posteo.de> <5734D996.8080203@abelian.org> <57351A13.3050802@posteo.de> <57357B06.6030701@abelian.org> <57370503.6030803@abelian.org> <57371C03.5040906@posteo.de> <57379EB7.6080905@posteo.de> <5738A8EE.2@abelian.org> In-Reply-To: <5738A8EE.2@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 Status: O X-Status: X-Keywords: X-UID: 8078 Hello Paul, Excellent! I'm happy :-) The error map correlates with the QRN strength, see https://dl.dropboxusercontent.com/u/19882028/VLF/wald5.jpg It's almost June and it works anyway... The antenna current was quite stable at 220 mA. I'm planning to rise it up to 240 mA and will run the very long message (19 chars) again. For 240 mA i need to be quite close to the resonance, so i need the transductor circuit to hold the resonance automatically. If some rain starts to fall, the total C will rise a bit, then the DC current in the transductor coil will rise, the transductor L will fall and the resonance will be hold on the spot! So far we got 3 chars, 5 chars and now 6 chars on 6470 Hz, each one at 100s symbols. 73, Stefan Am 15.05.2016 18:50, schrieb Paul Nicholson: > Stefan wrote: > > > f = 6470.00000 Hz > > Start time: 14.05.2016 21:40:02 UTC > > Symbol length: 100 s > > Characters: 6 > > CRC 16 > > Coding 8K19A > > An easy decode of 'JN49IK' with Eb/N0 = +3.8 dB. > > Phase pattern: 30 30 0 0 > > Carrier S/N: 16.96 dB in 17.9 uHz > > Symbol errors: http://abelian.org/vlf/tmp/160514a.gif > > > the same message > > Now I know the message I can reverse the modulation of > the previous attempt to see why it didn't decode. > > -- > Paul Nicholson > -- >