Message-ID: <4B978B2E.70404@iup.uni-heidelberg.de>
Date: Wed, 10 Mar 2010 13:06:06 +0100
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <BFF6723B062BFF40B4B7A6CF670160B403129C18@argos2.clb.tcfr.thales>
In-Reply-To: <BFF6723B062BFF40B4B7A6CF670160B403129C18@argos2.clb.tcfr.thales>
Subject: Re: LF: KITE ANT
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Content-Transfer-Encoding: quoted-printable
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


...In Germany you can use a maximum braid length of 100m without a=20
special licence. If 200m would be allowed, my vertical would be a 200m ;-)
But with a special permission you can relatively easy go up to 300m! I=20
still try to get that permission for the next weeks. Then, the VLF=20
signal would even be more than 10dB stronger, what would give the chance=
=20
for the UK to get the VLF signal, i hope so...

Static HV dangers are well known to all of us i assume. But the upper kV=
=20
range is nothing mystic. 10kV is just a factor 10 of 1kV, just like 10V=20
is a factor 10 of 1V. You can die if you touch a 10kV power line or if=20
you touch a 100kV power line. So there is just that rule: Do not touch=20
when under voltage and assure that there can be no voltage when you=20
think that there is no voltage (measuring, earthing during operating).=20
I've worked almost 6 years in the HV group of the institute of=20
electrical energy systems=20
(http://www.hst.tu-darmstadt.de/index.php?id=3D10&L=3D1) and had almost ea=
ch=20
week to work with voltages well above 20kV (up to 3MV, 1,2/50=B5s), so i=
=20
think i have the necessary respect without beeing afraid or careless. On=
=20
my hill there are no schools, no roads and no neighbours but i will keep=
=20
in mind what you caution on! :-)

73, Stefan/DK7FC


Am 10.03.2010 09:16, schrieb Jean-Louis.RAULT@fr.thalesgroup.com:
> Hi all
>
> May I ask you to pay some attention on the three following issues relate=
d to balloon/kite aerials ?
>
> - using "high" altitude kites or balloons is often subject to a formal=
 authorization (at least in France, and specially if you expect to use the=
 aerial close to an airfield)
>
> - even when weather is very good, very high DC voltages (many  kV) can=
 appear (from natural local electric field) on the antenna wire. DC ground=
ing of the wire is therefore mandatory
>
> - avoid any AC HV lines (or schools, or roads, or irritable neighbours)=
 in the vicinity of your experiment area.
>
> Regards
>
> Jean-Louis F6AGR
>   =20