On Thu, 7 May 2009 21:30:01 +0200 (CEST), dd3ly@arcor.de wrote:
> This ferrite material has the name 4C65 (violet colour)
I just compared the data sheet for this material with Fair-Rite #61.
The two materials are quite similar, but 4C65 looks to be superior,
to the extent that it maintains a low loss tangent to about 20%
higher frequency (u'' = 10 at about 19.5 MHz, as opposed to about 16
MHz for #61).
These are very good materials for transformers, lousy materials for
common mode chokes.
73,
Jim K9YC
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