From: "g3zjo" <g3zjo@npton.plus.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Tue, 29 Jun 2010 08:22:20 +0100
Message-ID: <000001cb175b$d064f090$0202a8c0@laptopcore2>
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In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1C70@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Subject: LF: RE: Extreme Dreaming: Announcement for the 47 km band :-)
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Congratulations Stephan

=20

I am following (dreaming) with interest. My RX set up is not wonderful=
 but I
shall be there when you announce a test, you never know.

Just the kite flying will be fun.

=20

Eddie G3ZJO

=20

-----Original Message-----
From: Stefan Sch=E4fer [mailto:owner-rsgb_lf_group@blacksheep.org] On=
 Behalf
Of Stefan Sch=E4fer
Sent: 29 June 2010 00:13
To: rsgb_lf_group@blacksheep.org
Cc: bernd.grupe@t-online.de
Subject: VLF: Extreme Dreaming: Announcement for the 47 km band :-)

=20

Dear VLF,

Today i have got the official permission of the german authorities for=
 a
kite vertical antenna up to 300 m above ground! :-))

This permission is time limited to the 30th June 2012, which is a pret=
ty
long time :-))))) Also, is limited to the location where i was QRV in=
 the
last experiments (JN49IS).

On each test (that MUST be during the daylight!) i have to inform the=
 german
air-traffic control. This can be done by a telephone call, so no probl=
em.

The owner of the kite store told me that there are 200m long braids fo=
r such
kites available. So, when using a 300 m vertical antenna i will add th=
is
braid to the 100 m braid that i am using all the time.

When transmitting with that antenna on 8,97 kHz i have to reduce the=
 L since
my C is abt 3 times higher. But to get experience with such huge
constructions i will start just using a 200m vertical without changing=
 the
L. This is a first step. My 600 W PA will have no problem with QSY sin=
ce it
is a H bridge without an output transformer. It can itdown do DC ;-)=
=20

Having twice the C without changing the L (later i will reduce it to=
 come
back to 8,97) will result in a resonance frequency of 8,97/sqrt(2) is=
 about
6,34 kHz, the 47,3 km band. When applying 500W i suppose to radiate an=
 ERP
of 16 mW!! In my 2nd test that was received by Paul Nicholson it was=
 1,7 mW,
so about 10 dB more in the next test. The exact frequency has to be fo=
und in
some measurements and is caused by the real resonance of the system.=
 So 6,34
kHz is just a number. But since i have the 30 mH variometer i am sure=
 to
make it adjustable within a range of some Hz.

Let's see what can be achieved with such an antenna on that frequency.

There were at least 10 RX stations who demonstated to have most suitab=
le VLF
RX possibilities in the last tests!Who of those (and others) are inter=
ested
to try an attempt to receive such a signal in good old DFCW-600 ?

This will be an exciting summer/autumn/winter, isn't it? Also on 137=
 kHz
;-)... *amhappy*=20

=20

73, Stefan/DK7FC

PS: If using 300m i will come down to 5,18 kHz, the 58 km band ;-) ...=
and
having 32 mW ERP

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