However, for the ferrite makers, its virtually always true that at HF a
ferrite with permeability of 1200 has lots of resistive loss. And the
distributors rate only on permeability, getting that resistive data
takes extra legwork, sometimes lots of extra work.
Most times I wish reactive isolation not to waste power in resistive
isolation.
73, Jerry, K0CQ
On 8/7/2010 2:41 AM, Jim Brown K9YC wrote:
On Fri, 06 Aug 2010 17:20:42 -0500, Dr. Gerald N. Johnson wrote:
For HF
choking they need an initial permeability of a few hundred to 1200 or
so. For a transformer that permeability for HF would be 50 or 125. Its
really hard to put multiple turns of RG-213 through any size of toroid.
Gerry,
You need to study the fundamentals of how ferrite chokes work. IT IS NOT
ABOUT PERMEABILITY. IT IS ABOUT RESISTIVE IMPEDANCE. Your analysis is badly
mistaken. You need to study my tutorial.
73, Jim K9YC
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