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Date: Wed, 3 Mar 2010 17:43:59 +0000
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From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: AW: LF: VLF TX experiments_short report
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Stefan,

If I understand correctly, DF8ZR was listening for your 8.9kHz signal but
did *not* receive you. Is this correct?

73s
Roger G3XBM

2010/3/4 Alexander S. Yurkov <fitec@omskcity.com>

> On Tue, 2 Mar 2010, [iso-8859-1] Stefan Sch=E4fer wrote:
> >
> > Yesterday the wind was suitable and the sun was out :-) So i was on th=
e
> hill
> > and did the first test. I even had an oscilloscope there to measure th=
e
> > antenna voltage and current waveforms. Some photos of the arrangement
> > will be shown on my site at qrz.com in some days (sri, have forgotten
> > cable between camera and PC...)
> > I just had 1,6kVrms on the wire. That is 23dB less than calculated but=
 it
> > was a first test. So, the ERP was just 1/200. Additionally i have
> > forgotten a part of the ground radial wich increased the earth
> > resistance. Bernd/DF8ZR received in a distance of abt 16km
>
> Anyway this is a new record on 9 kHz:-) Congadulations! Remember, this=
 is
> well out of near reactive zone. Thus field decreases as 1/D and if you
> increase voltage to 20 kV then distance will be 20:1.6=3D12.5 times more=
.
> 16*12.5=3D200km. You can see this first test corresponds
> well with previous calculations (it SHOULD be abt 16 km with such a
> voltage if 20 kV yelds 100-200 km). Factually you got first experimental
> insurance of the calculations. Besides real distance may be more then
> 200km because of ionosphere influence on such distances. All of this is
> very interesting.
>
> Regards,
> Alexander/RA9MB
>
>
>
>


--=20

http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/G3XBM
G3XBM    GQRP 1678      ISWL G11088

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Stefan,<br><br>If I understand correctly, DF8ZR was listening for your 8.9=
kHz signal but did <u>not</u> receive you. Is this correct?<br><br>73s<br>=
Roger G3XBM<br><br><div class=3D"gmail_quote">2010/3/4 Alexander S. Yurkov=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:fitec@omskcity.com">fitec@omskcit=
y.com</a>&gt;</span><br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; bord=
er-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class=3D"i=
m">On Tue, 2 Mar 2010, [iso-8859-1] Stefan Sch=E4fer wrote:<br>
&gt;<br>
&gt; Yesterday the wind was suitable and the sun was out :-) So i was on=
 the hill<br>
&gt; and did the first test. I even had an oscilloscope there to measure=
 the<br>
&gt; antenna voltage and current waveforms. Some photos of the arrangement=
<br>
&gt; will be shown on my site at <a href=3D"http://qrz.com" target=3D"_bla=
nk">qrz.com</a> in some days (sri, have forgotten<br>
&gt; cable between camera and PC...)<br>
&gt; I just had 1,6kVrms on the wire. That is 23dB less than calculated bu=
t it<br>
&gt; was a first test. So, the ERP was just 1/200. Additionally i have<br>
&gt; forgotten a part of the ground radial wich increased the earth<br>
&gt; resistance. Bernd/DF8ZR received in a distance of abt 16km<br>
<br>
</div>Anyway this is a new record on 9 kHz:-) Congadulations! Remember, th=
is is<br>
well out of near reactive zone. Thus field decreases as 1/D and if you<br>
increase voltage to 20 kV then distance will be 20:1.6=3D12.5 times more.<=
br>
16*12.5=3D200km. You can see this first test corresponds<br>
well with previous calculations (it SHOULD be abt 16 km with such a<br>
voltage if 20 kV yelds 100-200 km). Factually you got first experimental<b=
r>
insurance of the calculations. Besides real distance may be more then<br>
200km because of ionosphere influence on such distances. All of this is<br=
>
very interesting.<br>
<br>
Regards,<br>
Alexander/RA9MB<br>
<br>
<br>
<br>
</blockquote></div><br><br clear=3D"all"><br>-- <br><br><a href=3D"http://=
g3xbm-qrp.blogspot.com/">http://g3xbm-qrp.blogspot.com/</a><br><a href=3D"=
http://www.g3xbm.co.uk">http://www.g3xbm.co.uk</a><br><a href=3D"http://ww=
w.youtube.com/user/G3XBM">http://www.youtube.com/user/G3XBM</a><br>
G3XBM =9A =9AGQRP 1678 =9A =9A =9AISWL G11088<br>

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