Re: Balun Questions
Posted by
Brett Howard on
Jul 23, 2010; 6:53pm
URL: http://elecraft.85.s1.nabble.com/Balun-Questions-tp5328810p5330796.html
Interesting enough his high power one uses two cores and appears to be
made the same as the "budget" one that is wound on one core... Seems
like stacking them on top of one another is going to just couple them
and hinder your isolation but maybe I'm wrong there....
http://www.balundesigns.com/servlet/the-78/4-cln-1-dual-core-current/Detail~Brett (N7MG)
On Fri, Jul 23, 2010 at 11:31 AM, Tom W8JI <
[hidden email]> 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
>
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