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AW: VLF: 4th VLF experiment by DK7FC/p

To: <[email protected]>
Subject: AW: VLF: 4th VLF experiment by DK7FC/p
From: Stefan Schäfer <[email protected]>
Date: Sun, 4 Apr 2010 13:27:22 +0200
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Thread-index: AcrTzQe5YtnoQzSGSwSBlUv96WDW0wAGdqC3
Thread-topic: VLF: 4th VLF experiment by DK7FC/p
Hi Wolf, 
 
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 homemade 
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? ;-)
 
73, Stefan/DK7FC
 
PS/BTW: 2kW on VLF is no problem, since one does not have to work at 50 Ohm. 
So, if working with a H bridge (4 FETs) in the PA and a isolated primary, 
stepped coil (just like my coil), one can vary the output power by changing 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 ferrite 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 :-) 

________________________________

Von: [email protected] im Auftrag von Wolfgang Büscher
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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