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 w36EBgSH006267 for ; Fri, 6 Apr 2018 16:11:45 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1f4RzM-0006BM-N2 for rs_out_1@blacksheep.org; Fri, 06 Apr 2018 15:05:12 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1f4RzM-0006BD-89 for rsgb_lf_group@blacksheep.org; Fri, 06 Apr 2018 15:05:12 +0100 Received: from resqmta-ch2-07v.sys.comcast.net ([69.252.207.39]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1f4Rz9-0005gX-3n for rsgb_lf_group@blacksheep.org; Fri, 06 Apr 2018 15:05:11 +0100 Received: from resomta-ch2-11v.sys.comcast.net ([69.252.207.107]) by resqmta-ch2-07v.sys.comcast.net with ESMTP id 4Rwsf93cznLlk4Rx6frQlj; Fri, 06 Apr 2018 14:02:52 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1523023372; bh=xUDdc/0s+lWsb0MmaH06E+HPBDHZ7IgUM773cenW5X0=; h=Received:Received:Message-ID:From:To:Subject:Date:MIME-Version: Content-Type; b=Nbd5Dhey9jLtz3JRp4r4XYGTS+9eVwcUgmeq9ry8DyWLl9rEaLOcvjOKToxoslzEK vCby+mYom6sghc43PjEQF5rfJ1pqHKx8jKGwEHB3wXYyqiofH486tZzF2lvhMiknCQ +Iw/cvb8huvajWWiN38BODj9wsMse6vyBk9v7Vi8gUY/sZ7baXWFyop1x/iVnuwncR TLya9BEfCug+5D0Bdd+5ANG9jvQ5rqInxj3xPCRcnseHXxnNKTh9hyy7B5aOK3au8A tcZRP//8VJ3iQaRPxRFD0GX6pr0fkvXkJ1onNoD8705WlPA2L1V2Sf5l/vT6Kx0HJo wxyhCVLbTNAqw== Received: from DELL4 ([73.4.253.141]) by resomta-ch2-11v.sys.comcast.net with SMTP id 4Rx5fY3pliSdl4Rx5fkVud; Fri, 06 Apr 2018 14:02:52 +0000 Message-ID: <714D92E9B0B7484E9256B09D308D2F24@DELL4> From: To: References: <1629b0b7c40-1795-64b@webjasstg-vab15.srv.aolmail.net> Date: Fri, 6 Apr 2018 10:02:51 -0400 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 X-CMAE-Envelope: MS4wfJgVOaCm9EWx767Af3ilVoZUoP0mHWsPFo2mmOf9nT27k206fCSrpZ44ksrgq4+/3ZmRtWwIXc5DE4JbD6jQ15/PjbFlocmNOSwqlOdqVs7nnB0hs/Yi kR2pXbUEnRbQOX7nRyvA+VhVJHrlgaexoMJfc+o+6fS/tCbuNklNxGgi 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: Congrats to all involved! Jay W1VD ----- Original Message ----- From: Markus Vester To: Friday, April 06, 2018 9:00 AM Subject: Re: VLF: Carrier detection DL > VK7 on 17.4701 kHz Hi Stefan, Edgar, [...] 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 (jrusgrove[at]comcast.net) -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: 671be81035fb274514daa81d2095bf05 Subject: Re: VLF: Carrier detection DL > VK7 on 17.4701 kHz Content-Type: multipart/alternative; boundary="----=_NextPart_000_0040_01D3CD8E.6C4F1AD0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.3 required=5.0 tests=FORGED_MUA_OUTLOOK,HTML_20_30, HTML_MESSAGE,NO_REAL_NAME 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 This is a multi-part message in MIME format. ------=_NextPart_000_0040_01D3CD8E.6C4F1AD0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Congrats to all involved!=20 Jay W1VD ----- Original Message -----=20 From: Markus Vester=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, April 06, 2018 9:00 AM Subject: Re: VLF: Carrier detection DL > VK7 on 17.4701 kHz 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 = detect my DFCW-180 signal on 136 kHz at two different locations. He is = 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 = 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 frequency stability problems on the RX = site=20 but since the 21st of March the system was running well and stable. So = we could observe a growing SNR during certain times within the stacked = 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 = 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 = 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 ------=_NextPart_000_0040_01D3CD8E.6C4F1AD0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF
Congrats to all involved!
 
Jay W1VD
----- Original Message -----
From:=20 Markus=20 Vester
Sent: Friday, April 06, 2018 = 9:00=20 AM
Subject: Re: VLF: Carrier = detection DL=20 > VK7 on 17.4701 kHz

Hi Stefan, Edgar,

>> boundary of the garden=20 fence
Well the signal did end up in a garden fence. = Only=20 this time the garden is on the other side of Earth=20 ;-)

Absolutely impressive and truly groundbreaking = work!
Best 73,
Markus (DF6NM)
-----Urspr=C3=BCngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org= >Verschickt: Fr, 6. Apr 2018 14:07
Betreff: VLF:=20 Carrier detection DL > VK7 on 17.4701 kHz
Hi VLF,

A few = weeks ago i had=20 the crazy idea to try an attempt to be detected on
17.4701 kHz=20 in Tasmania / VK7.

Edgar J.T. is the = one on the=20 other side. A few years ago he managed to
detect my = DFCW-180=20 signal on 136 kHz at two different locations. He is
currently=20 watching ZEVS as well as other special signals on the VLF.
Using an omidirectional whip antenna on his side we = attempted to=20 detect
a pure carrier transmission that was = transmitted daily=20 from my site in
JN49IK00WD, beginning at March, = 15th.Each day i transmitted from 16...23 UTC with about 1 A = antenna=20 current
on my INV-L antenna wire 30m above the = ground. My=20 average ERP estimate
is 2.5 mW on that frequency = (average=20 estimate, not average ERP ;-) ).

At = the beginning=20 there were frequency stability problems on the RX site
but=20 since the 21st of March the system was running well and stable. So
we could observe a growing SNR during certain times = within the=20 stacked
files.

We = ended up=20 stacking 13 daily transmissions into one file to analyse. I build a simple script in vlfrx tools to produce a set of = data which=20 was
plotted in Excel. Here is the latest plot: http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/DL_VK7_174= 70.png
The curves show the SNR of the carrier = for different=20 start times and
durations. The best SNR (12.70 dB in = my stack)=20 is obtained when starting
at 19:20 UTC and watching = the signal=20 in 93 uHz, i.e. 3 hours.

After = reaching about 12=20 dB SNR it became clear that this will become a
successful=20 detection. So i informed Paul Nicholson to evaluate the files and asked for a critical comment regarding the = significance. He=20 used his
new fast PC to run a number of permutations = of the=20 files to produce an
even better SNR, by dropping a = few days=20 which do not contribute
positively to the stack. In = the end we=20 ended up at > 14 dB SNR and found
the strongest = peak of the=20 file(s) exactly on the expected frequency.

I=20 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
My thanks and congratulations go to = Edgar J.T. for=20 the successful
carrier detection and the permanent = available RX=20 system, as well as for
daily providing of the txt = files=20 containing the FFT data. Oh and not to
forget about = the=20 patience :-)
Also thanks to Markus and Paul for the = discussion=20 and support in the
background. And not to forget = about DL4YHF=20 for developing SpecLab, which
is a part of most of = these=20 achievements.

The boundary of the = garden fence=20 has been pushed a little bit more these
days!
73, Stefan
------=_NextPart_000_0040_01D3CD8E.6C4F1AD0--