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Date: Mon, 22 Feb 2010 15:29:26 +0000
Message-ID: <9afca2641002220729v30122b70k1624ce6576ec724c@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: VLF_8.79 kHz
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Rick, Horst, et al,

I am unsure of the "official" UK position regarding operation below 9kHz.
Back in the late 1960s a Test and Development Licence was required and I
held two around 1970 (G9BIB and G9BGU) for "earth mode" experiments between
0 and 50kHz.  If you ask OFCOM I suspect they will require you to have a
special permit (NoV), HI.

It would be very interesting to know just how far amateurs could communicate
below 9kHz. Amplifiers of 500-1000W coupled with the very best in weak
signal modes and widely spaced grounded electrodes or large induction loops
might result in the 10km barrier, achieved some years ago, being exceeded.
ERP is meaningless at these frequencies as virually nothing will be
radiated: communication will be by conduction through the ground or by
induction.

73s
Roger G3XBM




On 22 February 2010 14:50, Rik Strobbe <rik.strobbe@fys.kuleuven.be> wrote:

>
> And do you know if f<9kHz is free for other countries in europe as well?
> What about the UK?
>
>
> Stefan,
>
> in Belgium anything below 9kHz (and above 300GHz) is "free"
>
> 73, Rik  ON7YD - OR7T
>
>


-- 

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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<div>Rick, Horst,=A0et al,</div>
<div>=A0</div>
<div>I am unsure of the &quot;official&quot; UK position regarding operati=
on below 9kHz. Back in the late 1960s a Test and Development Licence was=
 required and I held two around 1970 (G9BIB and G9BGU) for &quot;earth mod=
e&quot; experiments between 0 and 50kHz.=A0 If=A0you ask=A0OFCOM I suspect=
 they will require you to have a special permit (NoV), HI.</div>

<div>=A0</div>
<div>It would be very interesting to know just how far amateurs could comm=
unicate below 9kHz. Amplifiers of 500-1000W coupled with the very best in=
 weak signal modes and widely spaced grounded electrodes or large inductio=
n loops might result in the 10km barrier, achieved some years ago, being=
 exceeded. ERP is meaningless at these frequencies as virually nothing wil=
l be radiated: communication will be by conduction through the ground or=
 by induction.</div>

<div>=A0</div>
<div>73s</div>
<div>Roger G3XBM</div>
<div>=A0</div>
<div><br><br>=A0</div>
<div class=3D"gmail_quote">On 22 February 2010 14:50, Rik Strobbe <span di=
r=3D"ltr">&lt;<a href=3D"mailto:rik.strobbe@fys.kuleuven.be">rik.strobbe@f=
ys.kuleuven.be</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8e=
x; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div>
<div class=3D"im">
<blockquote type=3D"cite"><br>And do you know if f&lt;9kHz is free for oth=
er countries in europe as well? What about the UK?<br></blockquote><br></d=
iv>Stefan,<br><br>in Belgium anything below 9kHz (and above 300GHz) is &qu=
ot;free&quot;<br>
<br>73, Rik=A0 ON7YD - OR7T<br><br></div></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://w=
ww.g3xbm.co.uk</a><br>
<a href=3D"http://www.youtube.com/user/G3XBM">http://www.youtube.com/user/=
G3XBM</a><br>G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088<br>

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