Mal,
It is used in my test antenna, for local tests. I tried to reach my
grabber out of a distance of 1,1km (home QTH to work QTH). Generally
this is a method to become on air for a first step but is not suitable
for DX.
You need some 10kV on your antenna (me too), so there is no alternative
of winding a big air coil like Markus(DF6NM), Paul(W1VLF),
Stefan(DK7FC)...
I estimate you need at least 500mA antenna current to reach >500km
but within the UK you could start with such a transformer.
I used the transformer just as a normal voltage transformer that was
connected to a small antenna, 8m long, 3m up. But you could arrange an
air gap in the ferrite part to adjust the L of the secondary to
resonate your antenna! So, the PA has not to handle too much reactive
power and harmonics are better filtered.
Place the transformer not in shack but on the antenna because it is
very loud ;-)
73 es gl,
Stefan/DK7FC
Am 14.05.2010 19:50, schrieb mal hamilton:
Stefan
What is this transformer actually
doing ?
mal/g3kev
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