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Date: Tue, 29 Jun 2010 01:13:27 +0200
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1C70@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: Extreme Dreaming: Announcement for the 47 km band :-)
Thread-Index: AcsW7Sjpl2Hr47eVRQuzQ8C+0LV9xwAE5vaqAASI4io=
References: <6D39CC1F4253463CB8570333737E59AA@PCCasa><38A51B74B884D74083D7950AD0DD85E82A1C1D@File-Server-HST.hst.e-technik.tu-darmstadt.de><B7FBFD72427D4802BC38C7310FB750A8@PCCasa><38A51B74B884D74083D7950AD0DD85E82A1C2E@File-Server-HST.hst.e-technik.tu-darmstadt.de><8585FA1C733D9A42AEA98C724D8FB811C053AA@FBCMST18V01.fbc.local><38A51B74B884D74083D7950AD0DD85E82A1C30@File-Server-HST.hst.e-technik.tu-darmstadt.de><48711884B26B40129A1D43EBB493A6BF@PCCasa><38A51B74B884D74083D7950AD0DD85E82A1C69@File-Server-HST.hst.e-technik.tu-darmstadt.de><001401cb1645$ce9e81c0$4001a8c0@lark> <AANLkTinwjH7yJkUmhovsJbfnzAmq6rqOxItoxLbw7Sbm@mail.gmail.com> <38A51B74B884D74083D7950AD0DD85E82A1C6C@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4C28C1C7.7000800@gmx.com> <008801cb16e3$671137c0$0301a8c0@your91hoehfy9g>,<4C28E4C7.1040408@legal-medicine.de> <BF4A524700075746A6467658DFC7102C51094D0DD7@ICTS-S-EXC2-CA.luna.kuleuven.be>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
Cc: <bernd.grupe@t-online.de>
Content-Type: multipart/mixed;
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Subject: VLF: Extreme Dreaming: Announcement for the 47 km band :-)
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


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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 pretty=
 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 germ=
an air-traffic control. This can be done by a telephone call, so no proble=
m.

The owner of the kite store told me that there are 200m long braids for su=
ch kites available. So, when using a 300 m vertical antenna i will add thi=
s 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 sin=
ce my C is abt 3 times higher. But to get experience with such huge constr=
uctions i will start just using a 200m vertical without changing the L. Th=
is is a first step. My 600 W PA will have no problem with QSY since 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 abo=
ut 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 found 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 variomet=
er 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 suitable=
 VLF RX possibilities in the last tests!Who of those (and others) are inte=
rested 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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