[Elecraft] Balun Questions

[Wes Stewart]

I haven't taken, nor at the moment do I have, the time to analyze this, but I'll throw it out.

http://home.earthlink.net/~christrask/Trask4to1Balun.pdf

Wes  N7WS

--- On Fri, 7/23/10, Tom W8JI <w8ji at w8ji.com> wrote:

> 
> 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