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Message-ID: <51E7DB06.9020305@iup.uni-heidelberg.de>
Date: Thu, 18 Jul 2013 14:09:42 +0200
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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In-Reply-To: <trinity-5a781a22-8eee-46f7-84ab-cfce1106ef48-1374134899721@3capp-webde-bs12>
Subject: Re: LF: new VLF-Activity on the next weekend
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Hello Eike,

I recommend to prepare a BIG ferrite core to up-transform the voltage=20
coming from the PA to get some more current into the earth! You will=20
probably have an impedance of a few 100 Ohm, mostly resistive. So you=20
will need a few 100V to apply the power. If you can find a big ferrite=20
core with a high =C2=B5r, you can build the transformer. I used one with =
100=20
primary turns and > 300 turns secondary. The wire can be small, e.g.=20
0.4mm diameter.

I can recommend e.g. that one:
https://www.buerklin.com/default.asp?event=3DShowArtikel(84D258)&context=3D=
SE:Epcos+ringkern&l=3Dd&jump=3DArtNr_84D258&ch=3D39944
or that one:
https://www.buerklin.com/default.asp?event=3DShowArtikel(84D2601)&context=
=3DSE:Epcos+ringkern&l=3Dd&jump=3DArtNr_84D2601&ch=3D88922

73, Stefan/DK7FC


Am 18.07.2013 10:08, schrieb Eike Katzera:
> Hi,
> we will use spectrum lap to generate the test signals and synchronise=20
> to knowen VLF-Stations.
> The capability of the transmitter ist ~ 92V/25A, but the outut power=20
> depends on the erth resistance / impedance wich we dont know. We also=20
> dont know the local possibilities and conditions so we have to wait=20
> and see, what is possible.
> We plan to use a local ground as one pole an some erth electrodes at a=20
> near small  river as the oposite pole. Maybe the distance between the=20
> electrodes  reach more than 100m.
> 73s
> Eike DL3IKE
> *Gesendet:* Mittwoch, 17. Juli 2013 um 23:46 Uhr
> *Von:* "Stefan Sch=C3=A4fer" <Stefan.Schaefer@iup.uni-heidelberg.de>
> *An:* rsgb_lf_group@blacksheep.org
> *Betreff:* Re: LF: new VLF-Activity on the next weekend
> Hello Eike,
>
> Who is we? And what is the electrode spacing, earth rod length? And=20
> how do you stabilize your signal generator? Are there any local=20
> watching stations so you start with a few km distance? Will you=20
> transmit a single long dash or do you plan some kind of modulation?=20
> What is the TX power?
> Some more informations would be useful..
> My grabber is watching 24/7:=20
> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html
>
> 73, Stefan/DK7FC
>
>
> Am 17.07.2013 21:59, schrieb Eike Katzera:
>
>     Hello Group,
>     we are planing some VLF-activity at 8970Hz during a Meeting of
>      electronic hobbyists nearby  Kassel / Germany (JO40vr) on this
>     Weekend.
>     The Plan is to run a VLF-PA between some ground electrodes. Due to
>     other activities we have no exact time plan, when to start.
>     Depending on internet access i will inform you about the details.
>     Thanks for looking for our signal in advance.
>     73s
>     Eike DL3IKE
>

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<head>
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">
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<body bgcolor=3D"#ffffff" text=3D"#000000">
Hello Eike, <br>
<br>
I recommend to prepare a BIG ferrite core to up-transform the voltage
coming from the PA to get some more current into the earth! You will
probably have an impedance of a few 100 Ohm, mostly resistive. So you
will need a few 100V to apply the power. If you can find a big ferrite
core with a high =C2=B5r, you can build the transformer. I used one with =
100
primary turns and &gt; 300 turns secondary. The wire can be small, e.g.
0.4mm diameter.<br>
<br>
I can recommend e.g. that one: <br>
<a class=3D"moz-txt-link-freetext" href=3D"https://www.buerklin.com/defau=
lt.asp?event=3DShowArtikel(84D258)&amp;context=3DSE:Epcos+ringkern&amp;l=3D=
d&amp;jump=3DArtNr_84D258&amp;ch=3D39944">https://www.buerklin.com/defaul=
t.asp?event=3DShowArtikel(84D258)&amp;context=3DSE:Epcos+ringkern&amp;l=3D=
d&amp;jump=3DArtNr_84D258&amp;ch=3D39944</a><br>
or that one:<br>
<a class=3D"moz-txt-link-freetext" href=3D"https://www.buerklin.com/defau=
lt.asp?event=3DShowArtikel(84D2601)&amp;context=3DSE:Epcos+ringkern&amp;l=
=3Dd&amp;jump=3DArtNr_84D2601&amp;ch=3D88922">https://www.buerklin.com/de=
fault.asp?event=3DShowArtikel(84D2601)&amp;context=3DSE:Epcos+ringkern&am=
p;l=3Dd&amp;jump=3DArtNr_84D2601&amp;ch=3D88922</a><br>
<br>
73, Stefan/DK7FC<br>
<br>
<br>
Am 18.07.2013 10:08, schrieb Eike Katzera:
<blockquote
 cite=3D"mid:trinity-5a781a22-8eee-46f7-84ab-cfce1106ef48-1374134899721@3=
capp-webde-bs12"
 type=3D"cite">
  <div style=3D"font-family: Verdana; font-size: 12px;">
  <div>
  <div>Hi,</div>
  <div>=C2=A0</div>
  <div>we will use spectrum lap to generate the test signals and
synchronise to knowen VLF-Stations.=C2=A0</div>
  <div>The capability of the transmitter ist ~ 92V/25A, but the outut
power depends on the erth resistance / impedance wich we dont know. We
also dont know the local possibilities and conditions so we have to
wait and see, what is possible.</div>
  <div>We plan to use a local ground as one pole an some erth
electrodes at a near small =C2=A0river as the oposite pole. Maybe the
distance between the electrodes =C2=A0reach more than 100m.</div>
  <div>=C2=A0</div>
  <div>73s</div>
  <div>Eike DL3IKE=C2=A0</div>
  <div>=C2=A0
  <div name=3D"quote"
 style=3D"border-left: 2px solid rgb(195, 217, 229); margin: 10px 5px 5px=
 10px; padding: 10px 0pt 10px 10px; word-wrap: break-word;">
  <div style=3D"margin: 0pt 0pt 10px;"><b>Gesendet:</b>=C2=A0Mittwoch, 17.
Juli 2013 um 23:46 Uhr<br>
  <b>Von:</b>=C2=A0"Stefan Sch=C3=A4fer"
<a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:Stefan.Schaefer@iup.uni=
-heidelberg.de">&lt;Stefan.Schaefer@iup.uni-heidelberg.de&gt;</a><br>
  <b>An:</b>=C2=A0<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:rs=
gb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><br>
  <b>Betreff:</b>=C2=A0Re: LF: new VLF-Activity on the next weekend</div>
  <div name=3D"quoted-content">
  <div style=3D"background-color: rgb(255, 255, 255);">Hello Eike,<br>
  <br>
Who is we? And what is the electrode spacing, earth rod length? And how
do you stabilize your signal generator? Are there any local watching
stations so you start with a few km distance? Will you transmit a
single long dash or do you plan some kind of modulation? What is the TX
power?<br>
Some more informations would be useful..<br>
My grabber is watching 24/7: <a moz-do-not-send=3D"true"
 class=3D"moz-txt-link-freetext"
 href=3D"http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.=
html"
 target=3D"_blank">http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VL=
F_Grabber.html</a><br>
  <br>
73, Stefan/DK7FC<br>
  <br>
  <br>
Am 17.07.2013 21:59, schrieb Eike Katzera:
  <blockquote>
    <div style=3D"font-family: Verdana; font-size: 12px;">
    <div>=C2=A0
    <div>Hello Group,</div>
    <div>we are planing some VLF-activity at 8970Hz during a Meeting of
=C2=A0electronic hobbyists nearby=C2=A0 Kassel / Germany (JO40vr) on this=
 Weekend.</div>
    <div>The Plan is to run a VLF-PA between some ground electrodes.
Due to other activities we have no exact time plan, when to start.</div>
    <div>Depending on internet access i will inform you about the
details.</div>
    <div>Thanks for looking for our signal in advance.</div>
    <div>=C2=A0</div>
    <div>73s</div>
    <div>=C2=A0</div>
    <div>Eike DL3IKE</div>
    <div>=C2=A0</div>
    <div>=C2=A0</div>
    </div>
    </div>
  </blockquote>
  </div>
  </div>
  </div>
  </div>
  </div>
  </div>
</blockquote>
</body>
</html>

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