One of their models states of the core material:
"Special mix toroid with custom designed permeability allows broad frequency
coverage. Toroid is coated with epoxy coating for added durablity."
(durability was spelled wrong), shame....:).
Don't know what this "special mix" is, but I have several Balun Designs
baluns/choke and they work very well.
Dale, k9vuj
On 08, Jan 2012, at 14:14, e73m@e73m.com wrote:
> Hello,
>
> did anyone measured balundesigns.com chokes. I have tried to make
> replica with FT240-K core and wound as on pictures but simple S21
> measurements shows poor response below 21MHz, nowhere near their
> published charts.
>
> It looks like their core is a bit different then then standard FT240-K
> core as used in Comtek/DXengineering chokes.
>
> 73 Danny E73M
>
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