Received-SPF: none (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) client-ip=195.171.43.25;
MIME-Version: 1.0
In-Reply-To: <041e01cf7e9e$a2047f50$e60d7df0$@comcast.net>
References: <538CD411.9000608@abelian.org>
	<041e01cf7e9e$a2047f50$e60d7df0$@comcast.net>
Date: Tue, 3 Jun 2014 08:16:07 +0100
Message-ID: <CANV8iXSwB7ssPBCzsm5JMQViwsPnFejEYfLhmZommxyMT0eiww@mail.gmail.com>
From: Harry Woodhouse <hwoodhouse3@gmail.com>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: RE: W4DEX trans-Atlantic at 8971 Hz
Content-Type: multipart/alternative; boundary=001a11c127661fe6f804fae94901
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

--001a11c127661fe6f804fae94901
Content-Type: text/plain; charset=UTF-8

Paul & Dex,

               Congratulations on your great achievement!

                               73s

                                Harry G3MFW


On 2 June 2014 21:09, <hvanesce@comcast.net> wrote:

> Paul and Dex,
>
> Congratulations on another great milestone, and the fine work that went
> into
> making it happen!
>
> Compliments also on agreement between Dex's ERP estimate, LWPC, Paul's
> receiver calibration and signal measurements; great work!
>
> 73, Jim AA5BW
>
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson
> Sent: Monday, June 2, 2014 12:44 PM
> To: rsgb_lf_group@blacksheep.org
> Subject: VLF: W4DEX trans-Atlantic at 8971 Hz
>
>
> At 2014-06-01 10:00 UT W4DEX began a long transmission of GPS locked
> carrier
> at 8971.000 Hz from 35.273N,80.371W.
>
> Between 2014-06-02 00:00 and 06:00 a carrier was measured at that frequency
> here in Todmorden 53.703N,2.072W with flux density around  0.05fT.  It was
> not very significant so I combined the H-field and E-field receiver outputs
> (correcting for their known phase and amplitude response) to produce a
> uni-directional antenna response. This brought the signal up to a
> significant level.
>
> The signal bearing was roughly west.  W4DEX is bearing 285 deg from here.
> The S/N is max on a bearing of 315 degrees which puts the prevailing
> south-westerly background nearer to the side of the antenna response.
>
> This gave the signal a respectable 12.5dB S/N in 46uHz bandwidth.
>
>   http://abelian.org/vlf/tmp/w4dex_140602a.gif
>
> This was the strongest peak in a span of over 6500 Fourier bins so is quite
> significant.
>
> The carrier was also visible during the daylight path in 23uHz bandwidth
> with average strength of around 0.02fT and with similar S/N thanks to the
> lower day time noise and reduced bandwidth.
>
> At 2014-06-02 12:00 Dex altered the TX frequency for a blind confirmation
> test. Six hours later the carrier (in 46uHz) had vanished and a new signal
> appeared at 8971.100 Hz with the same strength.
>
> An email response from Dex confirms 8971.1 as the new frequency.
>
> Range W4DEX to Todmorden UK is 6194 km.
>
> Ratio of day/night flux density agrees well with LWPC predictions for this
> path.  LWPC predicts strongest night signal between 00:30 and 04:30 and a
> sliding spectrum window agrees with this.
>
> LWPC requires ERP of 150uW to reproduce the observed flux density.  This is
> in the center of the ERP range estimated from W4DEX antenna dimensions and
> measured antenna current.
>
> --
> Paul Nicholson
> --
>
>
>

--001a11c127661fe6f804fae94901
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div><div>Paul &amp; Dex,<br><br></div>=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Co=
ngratulations on your great achievement!<br><br></div>=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 73s<br><br></div>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Harry G3MFW=
<br>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On 2 Ju=
ne 2014 21:09,  <span dir=3D"ltr">&lt;<a href=3D"mailto:hvanesce@comcast.ne=
t" target=3D"_blank">hvanesce@comcast.net</a>&gt;</span> wrote:<br><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex">
Paul and Dex,<br>
<br>
Congratulations on another great milestone, and the fine work that went int=
o<br>
making it happen!<br>
<br>
Compliments also on agreement between Dex&#39;s ERP estimate, LWPC, Paul=
9;s<br>
receiver calibration and signal measurements; great work!<br>
<br>
73, Jim AA5BW<br>
<br>
<br>
-----Original Message-----<br>
From: <a href=3D"mailto:owner-rsgb_lf_group@blacksheep.org">owner-rsgb_lf_g=
roup@blacksheep.org</a><br>
[mailto:<a href=3D"mailto:owner-rsgb_lf_group@blacksheep.org">owner-rsgb_lf=
_group@blacksheep.org</a>] On Behalf Of Paul Nicholson<br>
Sent: Monday, June 2, 2014 12:44 PM<br>
To: <a href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blackshee=
p.org</a><br>
Subject: VLF: W4DEX trans-Atlantic at 8971 Hz<br>
<br>
<br>
At 2014-06-01 10:00 UT W4DEX began a long transmission of GPS locked carrie=
r<br>
at 8971.000 Hz from 35.273N,80.371W.<br>
<br>
Between 2014-06-02 00:00 and 06:00 a carrier was measured at that frequency=
<br>
here in Todmorden 53.703N,2.072W with flux density around =C2=A00.05fT. =C2=
=A0It was<br>
not very significant so I combined the H-field and E-field receiver outputs=
<br>
(correcting for their known phase and amplitude response) to produce a<br>
uni-directional antenna response. This brought the signal up to a<br>
significant level.<br>
<br>
The signal bearing was roughly west. =C2=A0W4DEX is bearing 285 deg from he=
re.<br>
The S/N is max on a bearing of 315 degrees which puts the prevailing<br>
south-westerly background nearer to the side of the antenna response.<br>
<br>
This gave the signal a respectable 12.5dB S/N in 46uHz bandwidth.<br>
<br>
=C2=A0 <a href=3D"http://abelian.org/vlf/tmp/w4dex_140602a.gif" target=3D"_=
blank">http://abelian.org/vlf/tmp/w4dex_140602a.gif</a><br>
<br>
This was the strongest peak in a span of over 6500 Fourier bins so is quite=
<br>
significant.<br>
<br>
The carrier was also visible during the daylight path in 23uHz bandwidth<br=
>
with average strength of around 0.02fT and with similar S/N thanks to the<b=
r>
lower day time noise and reduced bandwidth.<br>
<br>
At 2014-06-02 12:00 Dex altered the TX frequency for a blind confirmation<b=
r>
test. Six hours later the carrier (in 46uHz) had vanished and a new signal<=
br>
appeared at 8971.100 Hz with the same strength.<br>
<br>
An email response from Dex confirms 8971.1 as the new frequency.<br>
<br>
Range W4DEX to Todmorden UK is 6194 km.<br>
<br>
Ratio of day/night flux density agrees well with LWPC predictions for this<=
br>
path. =C2=A0LWPC predicts strongest night signal between 00:30 and 04:30 an=
d a<br>
sliding spectrum window agrees with this.<br>
<br>
LWPC requires ERP of 150uW to reproduce the observed flux density. =C2=A0Th=
is is<br>
in the center of the ERP range estimated from W4DEX antenna dimensions and<=
br>
measured antenna current.<br>
<br>
--<br>
Paul Nicholson<br>
--<br>
<br>
<br>
</blockquote></div><br></div>

--001a11c127661fe6f804fae94901--