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References: <11250.89514.qm@web28501.mail.ukl.yahoo.com>
	<4D1DC897.2060606@iup.uni-heidelberg.de>
	<76636.6973.qm@web28508.mail.ukl.yahoo.com>
	<1567AC3A96624647ADC1F52EF1A1E625@JimPC>
	<732174.92691.qm@web28506.mail.ukl.yahoo.com>
	<AANLkTim-XvUJ=tkVe9eXfWXvRmE4Zp6H4Pfej73dqNxi@mail.gmail.com>
	<AANLkTi=19FFDSeKYoFkzCVPAUAp_v8czo3ufwjr7Y0p+@mail.gmail.com>
	<6DEB3BAD63314CE598337148AF10CAE0@JimPC>
	<6FF03593-9C77-4457-B506-F03ABCFE9FFE@gmail.com>
Date: Fri, 31 Dec 2010 19:18:51 +0000
Message-ID: <AANLkTi=sUeFKMPzs83pe8FiFEh8D0f=ESKpXdMJLQyR=@mail.gmail.com>
From: Gary - G4WGT <g4wgt@tiscali.co.uk>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: LF: VLF - G3XIZ
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Content-Type: text/plain; charset=ISO-8859-1

Hi Chris,

Well done & congratulations. As expected nothing seen here in IO83qo but it
was interesting watching the progress & reading all the mail.

73,

Gary - G4WGT - IO83qo.

LF MF Grabber <http://myweb.tiscali.co.uk/wgtaylor/grabber2.html> -
Web Site<http://myweb.tiscali.co.uk/wgtaylor/index.html>
 - Blogspot <http://www.g4wgt-mf2vlf.blogspot.com/> - 9kHz
Grabber<http://dl.dropbox.com/u/15990181/9khz.jpg>




On 31 December 2010 18:23, Roger Lapthorn <rogerlapthorn@gmail.com> wrote:

> Congratulations Chris! I will have to add this new UK VLF record to my
> sub-9kHz webpage. If Jim can copy then I should be able to as well with a
> better set-up. So pleased for you. Brilliant.
>
> 73s
> Roger G3XBM
>
> Sent from my iPod Touch 4g
>
> On 31 Dec 2010, at 17:45, "James Moritz" <james.moritz@btopenworld.com>
> wrote:
>
> > Dear Chris, LF Group,
> >
> > The signal disappeared some time around 1520utc - the complete trace is
> shown in the attachment.
> >
> > I made an estimate of the field strength of your signal by injecting a
> test signal at a known EMF into the loop antenna, and comparing with the
> level of your signal. The received FS at the strongest point (around
> 1330utc) worked out to be 1.8uV/m. Taking the distance between our locations
> as 37km, your ERP would have been 87uW. The SNR at best was around 15dB,
> making the noise level 0.32uV/m in the FFT noise bandwidth of 2.1mHz, or a
> noise density of 7uV/m per sqrt(Hz)
> >
> > Assuming a 50m vertical wire (heff ~ 25m),  Rrad of your antenna at
> 8.97kHz would be 880micro-ohms. Assuming 2.62dB directivity for an
> electrically short monopole compared to a dipole, and Iant of 200mA, the
> calculated value of ERP would then be 64uW. So there is reasonable agreement
> between these two calculations, the difference only being 1.3dB.
> >
> > Thanks for the tests,
> >
> > Cheers, Jim Moritz
> > 73 de M0BMU
> > <Dec31_08.jpg>
>
>


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Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Hi Chris,<div><br></div><div>Well done &amp; congratulations. As expected=
 nothing seen here in IO83qo but it was interesting watching the progress=
 &amp; reading all the mail.</div><div><br></div><div>73,<div><br></div><d=
iv>
Gary - G4WGT - IO83qo.</div><div><br></div><div><a href=3D"http://myweb.ti=
scali.co.uk/wgtaylor/grabber2.html" target=3D"_blank">LF MF Grabber</a>=A0=
-=A0<a href=3D"http://myweb.tiscali.co.uk/wgtaylor/index.html" target=3D"_=
blank">Web Site</a>=A0-=A0<a href=3D"http://www.g4wgt-mf2vlf.blogspot.com/=
" target=3D"_blank">Blogspot</a>=A0-=A0<a href=3D"http://dl.dropbox.com/u/=
15990181/9khz.jpg" target=3D"_blank">9kHz Grabber</a></div>
</div><div><br></div><div><br></div><div><br><br><div class=3D"gmail_quote=
">On 31 December 2010 18:23, Roger Lapthorn <span dir=3D"ltr">&lt;<a href=
=3D"mailto:rogerlapthorn@gmail.com">rogerlapthorn@gmail.com</a>&gt;</span>=
 wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex;">Congratulations Chris! I will have to add=
 this new UK VLF record to my sub-9kHz webpage. If Jim can copy then I sho=
uld be able to as well with a better set-up. So pleased for you. Brilliant=
.<br>

<br>
73s<br>
Roger G3XBM<br>
<br>
Sent from my iPod Touch 4g<br>
<div><div></div><div class=3D"h5"><br>
On 31 Dec 2010, at 17:45, &quot;James Moritz&quot; &lt;<a href=3D"mailto:j=
ames.moritz@btopenworld.com">james.moritz@btopenworld.com</a>&gt; wrote:<b=
r>
<br>
&gt; Dear Chris, LF Group,<br>
&gt;<br>
&gt; The signal disappeared some time around 1520utc - the complete trace=
 is shown in the attachment.<br>
&gt;<br>
&gt; I made an estimate of the field strength of your signal by injecting=
 a test signal at a known EMF into the loop antenna, and comparing with th=
e level of your signal. The received FS at the strongest point (around 133=
0utc) worked out to be 1.8uV/m. Taking the distance between our locations=
 as 37km, your ERP would have been 87uW. The SNR at best was around 15dB,=
 making the noise level 0.32uV/m in the FFT noise bandwidth of 2.1mHz, or=
 a noise density of 7uV/m per sqrt(Hz)<br>

&gt;<br>
&gt; Assuming a 50m vertical wire (heff ~ 25m), =A0Rrad of your antenna at=
 8.97kHz would be 880micro-ohms. Assuming 2.62dB directivity for an electr=
ically short monopole compared to a dipole, and Iant of 200mA, the calcula=
ted value of ERP would then be 64uW. So there is reasonable agreement betw=
een these two calculations, the difference only being 1.3dB.<br>

&gt;<br>
&gt; Thanks for the tests,<br>
&gt;<br>
&gt; Cheers, Jim Moritz<br>
&gt; 73 de M0BMU<br>
</div></div>&gt; &lt;Dec31_08.jpg&gt;<br>
<br>
</blockquote></div><br><br clear=3D"all"><br>-- <br><div><br></div><br>
</div>

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