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Date: Thu, 2 Sep 2010 10:02:05 +0100
Message-ID: <AANLkTinN=A_EG6NH+iGF=KqKi-dKjtj_0Ck-JJi1iU3V@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: ELF: ELF!
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Good luck Stefan.

It will be most interesting to see how far you can get without the
assistance of "utilities conduction" as was the case with my own small tes=
ts
in the summer.  If my understanding is right you have to get beyond about
25km to be in the far field at this sort of frequency, so reception at 40k=
m
is a good target. I wonder if the effective loop size (in the ground)
increases because of the increasing skin depth and signal penetration? If
so, the results might be better than expected.

I can look at these frequencies with the kit I've already used, but doubt
I'd see anything.

73s
Roger G3XBM


2010/9/2 Stefan Sch=E4fer <Stefan.Schaefer@iup.uni-heidelberg.de>

> Dear LF/VLF,
>
> Am 01.09.2010 19:43, schrieb mal hamilton:
>
>> Miracles are possible but impossibilities take a little longer.
>>
>
> Yes. Thus is just want to announce some tests on ELF, probably arround=
 2
> kHz. First i set up a grabber window for ELF, still with the VLF active
> antenna. I will built an ELF active antenna soon (some weeks). First tes=
ts
> will be done with the earth antenna (5 km), later i plan to reach 40 km=
 with
> the 200m or 300m antenna (using some parallel Cs or even a mains HV
> transformer?). Maybe some interesting effects will come up... Distances=
 will
> most probably not reach to UK or so but who knows (before some weeks, no=
 one
> belived that it is possible to reach almost 50 km with an earth antenna=
 at
> moderate TX power).
>
> Will there be any interested OMs for that project?
>
>
> 73, Stefan/DK7FC
>
>


--=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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Good luck Stefan.<br><br>It will be most interesting to see how far you ca=
n get without the assistance of &quot;utilities conduction&quot; as was th=
e case with my own small tests in the summer.=A0 If my understanding is ri=
ght you have to get beyond about 25km to be in the far field at this sort=
 of frequency, so reception at 40km is a good target. I wonder if the effe=
ctive loop size (in the ground) increases because of the increasing skin=
 depth and signal penetration? If so, the results might be better than exp=
ected.<br>
<br>I can look at these frequencies with the kit I&#39;ve already used, bu=
t doubt I&#39;d see anything.<br><br>73s<br>Roger G3XBM<br>=A0<br><br><div=
 class=3D"gmail_quote">2010/9/2 Stefan Sch=E4fer <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:Stefan.Schaefer@iup.uni-heidelberg.de">Stefan.Schaefer@iup=
.uni-heidelberg.de</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;">Dear LF/VLF,<br=
>
<br>
Am 01.09.2010 19:43, schrieb mal hamilton:<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;">
Miracles are possible but impossibilities take a little longer.<br>
</blockquote>
<br>
Yes. Thus is just want to announce some tests on ELF, probably arround 2=
 kHz. First i set up a grabber window for ELF, still with the VLF active=
 antenna. I will built an ELF active antenna soon (some weeks). First test=
s will be done with the earth antenna (5 km), later i plan to reach 40 km=
 with the 200m or 300m antenna (using some parallel Cs or even a mains HV=
 transformer?). Maybe some interesting effects will come up... Distances=
 will most probably not reach to UK or so but who knows (before some weeks=
, no one belived that it is possible to reach almost 50 km with an earth=
 antenna at moderate TX power).<br>

<br>
Will there be any interested OMs for that project?<br>
<br>
<br>
73, Stefan/DK7FC<br>
<br>
</blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D"http://g3xb=
m-qrp.blogspot.com/" target=3D"_blank">http://g3xbm-qrp.blogspot.com/</a><=
br><a href=3D"http://www.g3xbm.co.uk" target=3D"_blank">http://www.g3xbm.c=
o.uk</a><br>
<a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">http://www=
.youtube.com/user/g3xbm</a><br>G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088<=
br>

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