Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w36DBYPm006041 for ; Fri, 6 Apr 2018 15:11:37 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1f4QzD-0005pr-Mi for rs_out_1@blacksheep.org; Fri, 06 Apr 2018 14:00:59 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1f4QzC-0005pi-V9 for rsgb_lf_group@blacksheep.org; Fri, 06 Apr 2018 14:00:58 +0100 Received: from omr-a003e.mx.aol.com ([204.29.186.57]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1f4Qz4-0005NK-Mm for rsgb_lf_group@blacksheep.org; Fri, 06 Apr 2018 14:00:57 +0100 Received: from mtaomg-aam02.mx.aol.com (mtaomg-aam02.mx.aol.com [172.27.19.148]) by omr-a003e.mx.aol.com (Outbound Mail Relay) with ESMTP id 029C038000BA for ; Fri, 6 Apr 2018 09:00:45 -0400 (EDT) Received: from core-acx05e.mail.aol.com (core-acx05.mail.aol.com [10.76.14.46]) by mtaomg-aam02.mx.aol.com (OMAG/Core Interface) with ESMTP id 353D438000084 for ; Fri, 6 Apr 2018 09:00:44 -0400 (EDT) Received: from 188.194.222.230 by webjasstg-vab15.srv.aolmail.net (10.96.25.82) with HTTP (WebMailUI); Fri, 06 Apr 2018 09:00:43 -0400 Date: Fri, 6 Apr 2018 09:00:44 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <1629b0b7c40-1795-64b@webjasstg-vab15.srv.aolmail.net> In-Reply-To: <5AC761F9.7090706@posteo.de> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.194.222.230] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1523019644; bh=KaxtYHR66khXZj9eepCT2evq87Xd2vdoqlvmR1FILl0=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=LqNb+wyocRPKuTqyKzArT/cnCL1lKkIfBM2hNXbOOurZ0no63Fuki/dnC7nmV5hSI jgmEvVq8Q9izs9ZoFRYrwzuwDiBvq4dCSFn8UrortvQNRBhsGN67XE/hRE27HH6lsz 1RPqsaPEBEdD9NzLh/1Q/CuQR9Sm3NSAtggVqGGE= x-aol-sid: 3039ac1b13945ac76f7c70d3 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Stefan, Edgar, >> boundary of the garden fence Well the signal did end up in a garden fence. Only this time the garden is on the other side of Earth ;-) Absolutely impressive and truly groundbreaking work! [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: f7f918e40888a44a70dddae14bd6a529 Subject: Re: VLF: Carrier detection DL > VK7 on 17.4701 kHz Content-Type: multipart/alternative; boundary="----=_Part_2041_1181227808.1523019643968" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.63 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 ------=_Part_2041_1181227808.1523019643968 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Stefan, Edgar, >> boundary of the garden fence Well the signal did end up in a garden fence. Only this time the garden is = on the other side of Earth ;-) Absolutely impressive and truly groundbreaking work! Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: Fr, 6. Apr 2018 14:07 Betreff: VLF: Carrier detection DL > VK7 on 17.4701 kHz Hi VLF, A few weeks ago i had the crazy idea to try an attempt to be detected on=20 17.4701 kHz in Tasmania / VK7. Edgar J.T. is the one on the other side. A few years ago he managed to=20 detect my DFCW-180 signal on 136 kHz at two different locations. He is=20 currently watching ZEVS as well as other special signals on the VLF. Using an omidirectional whip antenna on his side we attempted to detect=20 a pure carrier transmission that was transmitted daily from my site in=20 JN49IK00WD, beginning at March, 15th. Each day i transmitted from 16...23 UTC with about 1 A antenna current=20 on my INV-L antenna wire 30m above the ground. My average ERP estimate=20 is 2.5 mW on that frequency (average estimate, not average ERP ;-) ). At the beginning there were frequency stability problems on the RX site=20 but since the 21st of March the system was running well and stable. So=20 we could observe a growing SNR during certain times within the stacked=20 files. We ended up stacking 13 daily transmissions into one file to analyse. I=20 build a simple script in vlfrx tools to produce a set of data which was=20 plotted in Excel. Here is the latest plot:=20 http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/DL_VK7_17470.png The curves show the SNR of the carrier for different start times and=20 durations. The best SNR (12.70 dB in my stack) is obtained when starting=20 at 19:20 UTC and watching the signal in 93 uHz, i.e. 3 hours. After reaching about 12 dB SNR it became clear that this will become a=20 successful detection. So i informed Paul Nicholson to evaluate the files=20 and asked for a critical comment regarding the significance. He used his=20 new fast PC to run a number of permutations of the files to produce an=20 even better SNR, by dropping a few days which do not contribute=20 positively to the stack. In the end we ended up at > 14 dB SNR and found=20 the strongest peak of the file(s) exactly on the expected frequency. I leave it to Paul to present the best spectrum peak and comment further=20 on the statistical significance of the signal. BTW this is the path: http://k7fry.com/grid/?qth=3DQE37PD&from=3DJN49IK00WD My thanks and congratulations go to Edgar J.T. for the successful=20 carrier detection and the permanent available RX system, as well as for=20 daily providing of the txt files containing the FFT data. Oh and not to=20 forget about the patience :-) Also thanks to Markus and Paul for the discussion and support in the=20 background. And not to forget about DL4YHF for developing SpecLab, which=20 is a part of most of these achievements. The boundary of the garden fence has been pushed a little bit more these=20 days! 73, Stefan ------=_Part_2041_1181227808.1523019643968 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Stefan, Edgar,

>> boundary = of the garden fence
Well the signal did end up in a garde= n fence. Only this time the garden is on the other side of Earth = ;-)

Absolutely impressive and truly groundbreaking work!

Best 73,
Markus (DF6NM)

-= ----Urspr=C3=BCngliche Mitteilung-----
Von: DK7FC <selb= erdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@= blacksheep.org>
Verschickt: Fr, 6. Apr 2018 14:07
Betreff: VLF: Carrier detection DL > VK7 on 17.4701 kHz

Hi VLF,

= A few weeks ago i had the crazy idea to try an attempt to be detected on 17.4701 kHz in Tasmania / VK7.

Edgar J.T. is the one on the other side. A few years ago he managed to =
detect my DFCW-180 signal on 136 kHz at two different loca= tions. He is
currently watching ZEVS as well as other spec= ial signals on the VLF.

Using an omidirect= ional whip antenna on his side we attempted to detect
a pu= re carrier transmission that was transmitted daily from my site in
JN49IK00WD, beginning at March, 15th.
Each day i = transmitted from 16...23 UTC with about 1 A antenna current
on my INV-L antenna wire 30m above the ground. My average ERP estimate is 2.5 mW on that frequency (average estimate, not average = ERP ;-) ).

At the beginning there were fre= quency stability problems on the RX site
but since the 21s= t of March the system was running well and stable. So
we c= ould observe a growing SNR during certain times within the stacked
files.

We ended up stacking 13 d= aily transmissions into one file to analyse. I
build a sim= ple script in vlfrx tools to produce a set of data which was
plotted in Excel. Here is the latest plot:
http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/= DL_VK7_17470.png

The curves show the S= NR of the carrier for different start times and
durations.= The best SNR (12.70 dB in my stack) is obtained when starting
at 19:20 UTC and watching the signal in 93 uHz, i.e. 3 hours.

After reaching about 12 dB SNR it became clear t= hat this will become a
successful detection. So i informed= Paul Nicholson to evaluate the files
and asked for a crit= ical comment regarding the significance. He used his
new f= ast PC to run a number of permutations of the files to produce an
even better SNR, by dropping a few days which do not contribute <= br abp=3D"2774">positively to the stack. In the end we ended up at > 14 = dB SNR and found
the strongest peak of the file(s) exactly= on the expected frequency.

I leave it to = Paul to present the best spectrum peak and comment further
on the statistical significance of the signal.

BTW this is the path: http://k7fry.com/grid= /?qth=3DQE37PD&from=3DJN49IK00WD

M= y thanks and congratulations go to Edgar J.T. for the successful
carrier detection and the permanent available RX system, as well as = for
daily providing of the txt files containing the FFT da= ta. Oh and not to
forget about the patience :-)
Also thanks to Markus and Paul for the discussion and support in the =
background. And not to forget about DL4YHF for developing = SpecLab, which
is a part of most of these achievements.
The boundary of the garden fence has been pu= shed a little bit more these
days!

73, Stefan

------=_Part_2041_1181227808.1523019643968--