Content-class: urn:content-classes:message
MIME-Version: 1.0
Date: Tue, 9 Mar 2010 22:15:27 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B47@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: VLF TX coil matching
Thread-Index: Acq/sW75YsY4YLePQiC1xi+ZqbMtWwAGapaW
References: <9afca2641003090337t4062bb3avc9b952612014c0ba@mail.gmail.com> <4B9678C3.7070907@iup.uni-heidelberg.de> <4B9689B9.8030805@abelian.org>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
Content-Type: multipart/mixed;
	boundary="----_=_NextPart_001_01CABFCD.A40DD590"
Subject: LF: VLF TX coil matching
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


------_=_NextPart_001_01CABFCD.A40DD590
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Paul,=20
=20
I plan to use an inductive coupled primary coil, out of bigger wire. The=
 impedance level is still not defined. Maybe it will not be 50 Ohm, Just=
 anything above some Ohms. The PA has a big output transformer with differ=
ent numbers of turns, like a universal transformer. So i will see which ta=
p is the best. The output power can simply be varied by this way. Using a=
 parallel C to the primary coil might be an idea. But the antenna system=
 has a high Z and i will watch the voltage form in a first step, so no pro=
blem. Or do you think i MUST have to built a simple band pass? Hm, that co=
uld be done with a audio diplexer.... I will see...
=20
It would be nice if others than Markus and me would also start to try such=
 an antenna! Walter/DJ2LF? But i understand, that you want to wait until=
 the 100m antenna has produced some records ;-)
=20
This weekend, i have no time, i am sorry! As you know i have changed my qt=
h from Darmstadt to Heidelberg and have found new friends here who want to=
 do something here with me. And i already have told them last week that i=
 have to build a TX coil on a water barrel, hi. But my job is a nice one:=
 Each friday and monday i have free time, so my weekend is 4 days! That me=
ans that we can do tests even on friday to monday, just when wind and fun=
 is available :-)
=20
73, Stefan/DK7FC

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Paul Nicholson
Gesendet: Di 09.03.2010 18:47
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: Possible VLF HV problems, or not?



I agree with Alexander, 10kV is not so high.  If you were looking
at > 30kV or 40kV or so, then it might become an issue.  But even
then it can be controlled at the ends.

I think it just has to be tried and the practical limits found.

It is good to consider these things as the territory is unfamiliar.

Stefan, how will you feed power into the coil?   I am running some
circuit models to see the effect of harmonics and coil overtones.
I want to see how much radiation there is when a drive harmonic
hits a coil overtone, as will happen by chance.  Will you drive a
square wave into the base from a switching amp?  No the voltage
needed will be too high - perhaps you are using a primary coil
or transformer?
--
Paul Nicholson
--



------_=_NextPart_001_01CABFCD.A40DD590
Content-Type: application/ms-tnef;
	name="winmail.dat"
Content-Transfer-Encoding: base64
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------_=_NextPart_001_01CABFCD.A40DD590--