Content-class: urn:content-classes:message
MIME-Version: 1.0
Date: Mon, 8 Mar 2010 20:27:09 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B40@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: LF: VLF TX coil ready
Thread-Index: Acq+ji5Hv9QsiEflT9it+d6jJgnWQQAZMr0E
References: <4B8E8027.3060809@iup.uni-heidelberg.de> <4B8EC9A9.80507@abelian.org> <38A51B74B884D74083D7950AD0DD85E82A1B31@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B9203FE.3000703@abelian.org> <38A51B74B884D74083D7950AD0DD85E82A1B34@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B92300A.7090604@freenet.de> <38A51B74B884D74083D7950AD0DD85E82A1B37@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B923D2C.1030307@freenet.de> <38A51B74B884D74083D7950AD0DD85E82A1B39@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B949FC4.6070301@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_01CABEF5.5875B059"
Subject: AW: LF: VLF TX coil ready
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


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Paul, LF,=20
=20
Tnx for the calculations. Today i again added some turn to the coil. Now=
 it has L =3D 550mH, just optimal.
My antenna has C=3D580pF (measured on 137kHz). When theoretically calculat=
ing the C of a 100m vertical, you achieve almost the same. I measured the=
 resonance with the DDS-VFO and a series circuit of the L and a C of 570pF=
 (470+100). Now the resonance is @ 8964 Hz! :-) Q=3D82 and R(DC) 283 Ohm.=
 Bandwidth is 109 Hz.
Tomorrow i built an additional variometer coil with about 30mH. Then i giv=
e the rest of the wire back to the company where i have got it and have to=
 pay abt 13 Euro/kg, pretty cheep ;-)
Then, in the next days i will apply a Amperemeter for 1A full range into=
 the coil :-)
About the Q you assumed that it will be worse in the field but i do not so=
 since if we imagine the stray field of such a coil, it was rather influen=
ced in the house than later in the field.
BTW, today i tried to vary the resonance by applying a ferrite rod into th=
e field (0,1m long and 10mm diameter) but almost nothing happend! The dime=
nsions seem just to be to extreme...
=20
Walter/DJ2LF, don't you want to try to reach Markus' grabber? Would that=
 be a new record?
=20
A Question to Markus: What about heat problems in your VLF coil? Since the=
 yoghurt cups are stacked, is there a adequate cooling possible? What coul=
d be the maximum current in your system when increasing the power? You nee=
d a PA! ;-)
=20
And: Does anybody of the group want to buy such a kite? A second "kite-sta=
tion" would give the chance for a 2 way QSO there! Maybe in good old CW!=
 :-)
=20
73, Stefan/DK7FC

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Paul Nicholson
Gesendet: Mo 08.03.2010 07:57
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: VLF TX coil ready



Stefan Sch=E4fer schrieb:

 > [VLF loading coil] has about 1100 turns. Average diameter is
 > about 0,55m, hight about 0,5m.

I ran this info through a modelling program, with a guess that
the wire is 26awg:-

  Ldc: 482mH
  Rdc: 258.3 ohms

Resonances, unloaded, base grounded, stood vertically 10cm
above a good ground with nothing within a few metres:-

  1/4 wave : 46.56 kHz
  3/4 wave: 121.7 kHz
  5/4 wave: 195.5 kHz

Adding a 100m kite, 2m diameter, raised vertically (=3D560pF) to
the model, I found I needed an extra 70pF of shunt loading to
bring the system into tune.

The system resonances then become:

  1/4 wave:   8.973 kHz
  3/4 wave: 116.3 kHz
  5/4 wave: 185.4 kHz

Hopefully you can seal the coil before the thing warms up and
the turns fall out of place!

 > TX power of 200W.

I bet you will need more, eg 500W.   Very hard to predict the
Q factor obtained in the field, but it is always lower than what
you hope it will be!
--
Paul Nicholson
--



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