Re: Balun Questions

Posted by W8JI on Jul 23, 2010; 6:31pm
URL: http://elecraft.85.s1.nabble.com/Balun-Questions-tp5328810p5330717.html


Ok I was referring to a design that was using one core to make a
4:1...  I think the caveat that was being used was that they felt they
could do this and be safe enough with it still being a balun as long
as the load was floating (but I'm not 100% sure thats really the
case)...>>>

I can 100% guarantee you that does not balance the load. I know the design
comes from a source considered reliable, but it is seriously flawed. If you
want a balanced voltage and/or current into a feedline and a real antenna,
it cannot happen with that design. It not only does not work in theory, I
have dozens of actual measurements to support it does not work in the real
world.

<<So is a multi aperture core good enough for that or would two toroids
be a better idea?>>

So long as the multi-aperture core does not have mutual coupling between the
individual transmission line cores, it would work. Unfortunately that is not
likely either. :-)

73 Tom

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