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Date: Wed, 3 Mar 2010 20:33:29 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B2E@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: AW: LF: VLF TX experiments_short report
Thread-Index: Acq6+b5TqUHJvmK3SVarnnnFjI1GTgADWk0S
References: <38A51B74B884D74083D7950AD0DD85E82A1B2A@File-Server-HST.hst.e-technik.tu-darmstadt.de><Pine.LNX.3.95.1100304001225.319A-100000@noname.nodomain.nowhere> <9afca2641003030943j79fe0f1cg6bb4786cb2b24171@mail.gmail.com>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
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Subject: AW: AW: LF: VLF TX experiments_short report
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Yes Roger, sorry, but he did not receive me. Sorry Alexander. But as i wro=
te it was a first test and as we know from LF: The RX side is also importa=
nt, just as the TX side. And my signal was 23dB weaker than calculated! On=
e can say "I can excellent see the alpha stns" but may anyway have a bad=
 RX antenna. So it may be difficult to evaluate this unless one has no ama=
teur signals to receive... But we will do the job! Surely!=20
Markus/DF6NM, help us! ;-) Take some days for VLF-holidays or spend the we=
ekend ;-)
73, Stefan/7FC=20

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Roger Lapthorn
Gesendet: Mi 03.03.2010 18:43
An: rsgb_lf_group@blacksheep.org
Betreff: Re: AW: LF: VLF TX experiments_short report


Stefan,

If I understand correctly, DF8ZR was listening for your 8.9kHz signal but=
 did not receive you. Is this correct?

73s
Roger G3XBM


2010/3/4 Alexander S. Yurkov <fitec@omskcity.com>


    On Tue, 2 Mar 2010, [iso-8859-1] Stefan Sch?fer wrote:
    >
    > Yesterday the wind was suitable and the sun was out :-) So i was on=
 the hill
    > and did the first test. I even had an oscilloscope there to measure=
 the
    > antenna voltage and current waveforms. Some photos of the arrangemen=
t
    > will be shown on my site at qrz.com <http://qrz.com/>  in some days=
 (sri, have forgotten
    > cable between camera and PC...)
    > I just had 1,6kVrms on the wire. That is 23dB less than calculated=
 but it
    > was a first test. So, the ERP was just 1/200. Additionally i have
    > forgotten a part of the ground radial wich increased the earth
    > resistance. Bernd/DF8ZR received in a distance of abt 16km
   =20
   =20
    Anyway this is a new record on 9 kHz:-) Congadulations! Remember, this=
 is
    well out of near reactive zone. Thus field decreases as 1/D and if you
    increase voltage to 20 kV then distance will be 20:1.6=3D12.5 times mo=
re.
    16*12.5=3D200km. You can see this first test corresponds
    well with previous calculations (it SHOULD be abt 16 km with such a
    voltage if 20 kV yelds 100-200 km). Factually you got first experiment=
al
    insurance of the calculations. Besides real distance may be more then
    200km because of ionosphere influence on such distances. All of this=
 is
    very interesting.
   =20
    Regards,
    Alexander/RA9MB
   =20
   =20
   =20
   =20




--=20

http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk <http://www.g3xbm.co.uk/>=20
http://www.youtube.com/user/G3XBM
G3XBM    GQRP 1678      ISWL G11088

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