Content-class: urn:content-classes:message
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Date: Sun, 4 Apr 2010 13:27:22 +0200
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1BCD@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: VLF: 4th VLF experiment by DK7FC/p
Thread-Index: AcrTzQe5YtnoQzSGSwSBlUv96WDW0wAGdqC3
References: <4BB8451B.1090207@freenet.de>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
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	boundary="----_=_NextPart_001_01CAD3E9.CB5EDCAB"
Subject: AW: VLF: 4th VLF experiment by DK7FC/p
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


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Hi Wolf,=20
=20
I prefer to build my PAs selfe. This is ham radio, no need for expensive,=
 "ready to use" equipment, especially on LF/VLF. In my point if view, a ho=
memade PA without a noble housing but rather chaotic soldered and working=
 is more beautiful. It has something individual, creative! :-)
Don't you think the same way? ;-)
=20
73, Stefan/DK7FC
=20
PS/BTW: 2kW on VLF is no problem, since one does not have to work at 50 Oh=
m. So, if working with a H bridge (4 FETs) in the PA and a isolated primar=
y, stepped coil (just like my coil), one can vary the output power by chan=
ging the primary number of windings. Maybe i should follow this idea! ;-)=
 Really, i got this idea in this moment! Currently i am using a big ferrit=
e output transformer for the new PA and i am afraid it is not suitable for=
 such a power at such a low frequency. I will try this :-)=20

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Wolfgang B=FCscher
Gesendet: So 04.04.2010 09:51
An: RSGB LF Group
Betreff: Re: VLF: 4th VLF experiment by DK7FC/p



Hi Stefan and group,

Looking for a "big" VLF PA ?

http://www.thomann.de/de/the_tamp_d3400.htm

Ok, 2 * 1800 watts at 4 Ohms or 2 * 2000 watts at 2 Ohms are a bit
impractical, but it's a 'virtually undestructable' class-D amplifier,
and the price is more or less a bargain ;-)


73,
   Wolf .



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