Return-Path: X-Spam-DCC: paranoid 1169; 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=-1.6 required=5.0 tests=BAYES_00,HTML_MESSAGE, NO_REAL_NAME 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 sB2J0CaM006453 for ; Tue, 2 Dec 2014 20:00:12 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Xvsb1-0000r6-EX for rs_out_1@blacksheep.org; Tue, 02 Dec 2014 18:54:47 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Xvsb0-0000qx-QS for rsgb_lf_group@blacksheep.org; Tue, 02 Dec 2014 18:54:46 +0000 Received: from resqmta-po-11v.sys.comcast.net ([96.114.154.170]) by relay1.thorcom.net with esmtps (TLSv1.2:DHE-RSA-AES256-SHA:256) (Exim 4.84) (envelope-from ) id 1Xvsax-0005E4-Ed for rsgb_lf_group@blacksheep.org; Tue, 02 Dec 2014 18:54:45 +0000 Received: from resomta-po-01v.sys.comcast.net ([96.114.154.225]) by resqmta-po-11v.sys.comcast.net with comcast id Niud1p0014s37d401iugq6; Tue, 02 Dec 2014 18:54:40 +0000 Received: from Owner ([69.143.126.216]) by resomta-po-01v.sys.comcast.net with comcast id Niuf1p0094gFcuV01iuf5H; Tue, 02 Dec 2014 18:54:40 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK From: To: References: <547DB994.7040801@abelian.org> <8D1DC6BE562A3CB-73E8-4F493@webmail-vm017.sysops.aol.com> In-Reply-To: <8D1DC6BE562A3CB-73E8-4F493@webmail-vm017.sysops.aol.com> Date: Tue, 2 Dec 2014 13:54:21 -0500 Message-ID: <22d501d00e61$67fa0700$37ee1500$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQF5OCuNfEKSm+aGov3obHdRhEWACAIfgddRnRlT6tA= Content-Language: en-us DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20140121; t=1417546480; bh=i0epWlAhIOxRq5sJgFOGA7tYF3s1WBEWEuT9/wvOX/E=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=s3P0iKT+AQMO7q6pHcLbvR1BDIWhwMQ0y70IqPexr5SYR3Ji51j7IWB+6hu8iJb02 CvgXLr0AZPeDWSL5xo/Y2mwKKi4EQRbRNQU5NZhvGVYJIrphXCyQoOpSdilDxc7mN0 J/qJdsTsZV7yRE7qF3HaM1x70KQlhb/sDR5Mo3P5nolg1sP/Ihx1hXFnBqW1Q33RpB j50P/4zM+c5IGOpS53wRpeRNjQquLhU+SBTJvcLJEbbLU7FxNx+2VEMu2IzNCOBbJw on5CU5T3z7K6fH6qNtjWoP65YK0tfjzMJ7YKLeYAn4CeHS16EfX3GLnlPgZO5vrPxC kEInNvX0sNrvA== X-Scan-Signature: 5b2a1741ff6005bcc592ba121fc2f048 Subject: RE: VLF: W4DEX in Europe at 8820 Hz Content-Type: multipart/alternative; boundary="----=_NextPart_000_22D6_01D00E37.7F270C40" 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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1398 This is a multipart message in MIME format. ------=_NextPart_000_22D6_01D00E37.7F270C40 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I would like to second Markus=E2=80=99s motion: impressive results and = cooperative effort; congratulations. =20 I am in northern Virginia monitoring 8820 and will post spectrograms if = local noise obliges. =20 73, =20 Jim AA5BW =20 =20 From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester Sent: Tuesday, December 2, 2014 12:24 PM To: rsgb_lf_group@blacksheep.org Cc: dl4yhf@freenet.de; contact@vlf.it; mike@unixnut.net Subject: Re: VLF: W4DEX in Europe at 8820 Hz =20 Paul, =20 once more, very impressive work! I'm tempted to call that a TA first for = Dex and Wolf, and Renato at even larger distance is getting very close. = But most of all, I think it's the cooperative effort between you guys = which really deserves congratulations! =20 Markus (DF6NM) =20 Von: Paul Nicholson An: rsgb_lf_group Cc: wolf_dl4yhf Verschickt: Di, 2 Dez 2014 5:47 pm Betreff: Re: VLF: W4DEX in Europe at 8820 Hz =20 Another plot from Wolf's receiver at Bielefeld,=20 =20 http://abelian.org/vlf/tmp/141202e.gif=20 =20 This covers the full transmission from 22:30 UT in 50.5 uHz=20 bandwidth. The line at 8820.0000 is 11.7 dB above the=20 noise in this 1980 bin span.=20 =20 It is the strongest bin in +/- 0.5Hz (19800 bins).=20 =20 Of course, I also checked nearby integer frequencies - when using=20 PPS GPS timing there is the possibility of weak harmonics from=20 the timing system.=20 =20 I tried Cumiana with this narrower bandwidth but no improvement.=20 =20 --=20 Paul Nicholson=20 --=20 =20 -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Paul Nicholson An: rsgb_lf_group Cc: wolf_dl4yhf ; Renato Romero ; = Michael Smith Verschickt: Di, 2 Dez 2014 2:09 pm Betreff: VLF: W4DEX in Europe at 8820 Hz Spectrogram of W4DEX at Forest, VA (range 254km)=20 =20 http://abelian.org/vlf/tmp/141202a.png=20 =20 No sign of any frequency lock problems now. All the energy=20 is concentrated in one frequency bin so the signal appears a=20 lot stronger than the previous day.=20 =20 Unfortunately the rx at Hawley TX stopped sending its VLF=20 stream yesterday.=20 =20 W4DEX was quite good strength at Todmorden, getting up to around=20 0.15 fT which is slightly above LWPC prediction for 150uW ERP.=20 Actually that's a very good signal - European TXs are often=20 similar or less strength.=20 =20 Spectrum plot, average 00:00 to 04:00 UT combining E and H=20 =20 http://abelian.org/vlf/tmp/141202b.gif=20 =20 The above is on the optimum bearing of 310 deg (line of sight=20 is 285 deg).=20 =20 Average signal strength 0.12 fT, 13.9 db S/N in 69.4uHz.=20 =20 E-field S/N is 13.0 dB S/N and combined gives 16.49 dB S/N.=20 =20 The noise from the south west was fairly high until 02:00 so=20 it wasn't really a good night for reception. It would probably=20 not have been successful to try a long BPSK message.=20 =20 We also see a low significance peak in the spectrum at=20 Bielefeld Germany (52.146N,8.458E 6918km) in the same period=20 and bandwidth:=20 =20 http://abelian.org/vlf/tmp/141202c.gif=20 =20 8820.0000 at 10.0dB S/N is the strongest peak in +/-1440=20 bins but there are noise peaks not much lower. Widening the=20 range to +/- 0.25 Hz (7200 bins) produces one stronger peak=20 at another frequency.=20 =20 I suspect Wolf's receiver is picking up the signal but it is=20 a dB or so too low to be claimed as a detection. This is an=20 E-field rx so there is no directivity to exploit.=20 =20 Cumiana, Italy (44.96N,7.42E 7173km) also shows an insignificant=20 line at 8820.0000 with 8.8 dB S/N but there are nine stronger=20 noise peaks in 2880 neighbour bins.=20 =20 Coherently combining Bielefeld and Cumiana produces a signal=20 with 11.7 dB S/N=20 =20 http://abelian.org/vlf/tmp/141202d.gif=20 =20 and this is the strongest signal in 23000 adjacent frequency=20 bins (I didn't look any wider than that +/- 0.8 Hz range=20 because there are some strong interference lines).=20 =20 It therefore looks like that Dex is getting into Germany and=20 Italy but it needs a more significant result - without the=20 devious trickery that I use to combine receiver outputs.=20 =20 If there was 50% or so extra antenna current and a good low=20 background night, the extra 3 dB or so would surely put this in=20 the bag.=20 =20 --=20 Paul Nicholson=20 --=20 =20 =20 =20 ------=_NextPart_000_22D6_01D00E37.7F270C40 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I would like to second Markus=E2=80=99s motion: impressive results = and cooperative effort; congratulations.

 

I am in northern Virginia monitoring 8820 and will post spectrograms = if local noise obliges.

 

73,

 

Jim AA5BW =C2=A0

 

From:= = owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus = Vester
Sent: Tuesday, December 2, 2014 12:24 PM
To: = rsgb_lf_group@blacksheep.org
Cc: dl4yhf@freenet.de; = contact@vlf.it; mike@unixnut.net
Subject: Re: VLF: W4DEX in = Europe at 8820 Hz

 

P= aul,

&= nbsp;

o= nce more, very impressive work! I'm tempted to call that = a TA first for Dex and Wolf, and Renato at even larger distance is = getting very close. But most of all, I think it's = the cooperative effort between you guys which really = deserves congratulations!

&= nbsp;

M= arkus (DF6NM)

&= nbsp;

V= on: Paul Nicholson <vlf0403@abelian.org>
An: = rsgb_lf_group <rsgb_lf_group@blacksheep.org= >
Cc: wolf_dl4yhf <dl4yhf@freenet.de>
Verschickt= : Di, 2 Dez 2014 5:47 pm
Betreff: Re: VLF: W4DEX in Europe at 8820 = Hz

 =


Another plot =
from Wolf's receiver at Bielefeld, 

=C2=A0

=C2=A0=C2=A0http://abelian.org/vlf/tmp/141202e.gif =


=C2=A0

This covers =
the full transmission from 22:30 UT in 50.5 uHz 

bandwidth.=C2=A0=C2=A0 The line at 8820.0000 is =
11.7 dB above the 

noise in this =
1980 bin span. 

=C2=A0

It is the =
strongest bin in +/- 0.5Hz (19800 bins). 

=C2=A0

Of course, I =
also checked nearby integer frequencies - when using 

PPS GPS =
timing there is the possibility of weak harmonics from 

the timing =
system. 

=C2=A0

I tried =
Cumiana with this narrower bandwidth but no improvement. =


=C2=A0

-- =


Paul =
Nicholson 

-- =


=C2=A0





-----Urspr=C3=BCngliche Mitteilung----- =
Von: Paul Nicholson <vlf0403@abelian.org>
An: = rsgb_lf_group <rsgb_lf_group@blacksheep.org= >
Cc: wolf_dl4yhf <dl4yhf@freenet.de>; Renato = Romero <contact@vlf.it>; = Michael Smith <mike@unixnut.net>
Verschickt: = Di, 2 Dez 2014 2:09 pm
Betreff: VLF: W4DEX in Europe at 8820 = Hz

Spectrogram =
of W4DEX at Forest, VA (range 254km) 

=C2=A0

=C2=A0=C2=A0http://abelian.org/vlf/tmp/141202a.png =


=C2=A0

No sign of =
any frequency lock problems now.=C2=A0=C2=A0 All the energy =


is =
concentrated in one frequency bin so the signal appears a =


lot stronger =
than the previous day. 

=C2=A0

Unfortunately =
the rx at Hawley TX stopped sending its VLF 

stream =
yesterday. 

=C2=A0

W4DEX was =
quite good strength at Todmorden, getting up to around 

0.15 fT which =
is slightly above LWPC prediction for 150uW ERP. 

Actually =
that's a very good signal - European TXs are often 

similar or =
less strength. 

=C2=A0

Spectrum =
plot, average 00:00 to 04:00 UT combining E and H 

=C2=A0

=C2=A0=C2=A0http://abelian.org/vlf/tmp/141202b.gif =


=C2=A0

The above is =
on the optimum bearing of 310 deg (line of sight 

is 285 deg). =


=C2=A0

Average =
signal strength 0.12 fT, 13.9 db S/N in 69.4uHz. 

=C2=A0

E-field S/N =
is 13.0 dB S/N and combined gives 16.49 dB S/N. 

=C2=A0

The noise =
from the south west was fairly high until 02:00 so 

it wasn't =
really a good night for reception.=C2=A0 It would probably =


not have been =
successful to try a long BPSK message. 

=C2=A0

We also see a =
low significance peak in the spectrum at 

Bielefeld =
Germany (52.146N,8.458E 6918km) in the same period 

and =
bandwidth: 

=C2=A0

=C2=A0=C2=A0http://abelian.org/vlf/tmp/141202c.gif =


=C2=A0

8820.0000 at =
10.0dB S/N is the strongest peak in +/-1440 

bins but =
there are noise peaks not much lower.=C2=A0 Widening the =


range to +/- =
0.25 Hz (7200 bins) produces one stronger peak 

at another =
frequency. 

=C2=A0

I suspect =
Wolf's receiver is picking up the signal but it is 

a dB or so =
too low to be claimed as a detection.=C2=A0 This is an 

E-field rx so =
there is no directivity to exploit. 

=C2=A0

Cumiana, =
Italy (44.96N,7.42E 7173km) also shows an insignificant =


line at =
8820.0000 with 8.8 dB S/N but there are nine stronger 

noise peaks =
in 2880 neighbour bins. 

=C2=A0

Coherently =
combining Bielefeld and Cumiana produces a signal 

with 11.7 dB =
S/N 

=C2=A0

=C2=A0=C2=A0http://abelian.org/vlf/tmp/141202d.gif =


=C2=A0

and this is =
the strongest signal in 23000 adjacent frequency 

bins (I =
didn't look any wider than that +/- 0.8 Hz range 

because there =
are some strong interference lines). 

=C2=A0

It therefore =
looks like that Dex is getting into Germany and 

Italy but it =
needs a more significant result - without the 

devious =
trickery that I use to combine receiver outputs. 

=C2=A0

If there was =
50% or so extra antenna current and a good low 

background =
night, the extra 3 dB or so would surely put this in 

the bag. =


=C2=A0

-- =


Paul =
Nicholson 

-- =


=C2=A0

<= o:p> 

 

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