Brett,

The coupling between the toroids is not as much of a problem as the flux 
cancellation when an attempt to use one core - that just does not work 
right.

73,
Don W3FPR

Brett Howard wrote:
> 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)
>   
>
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