[RFI] [Amps] 4C65 low loss ferrite - BIG toroids

[Jim Brown]

On Thu, 7 May 2009 21:30:01 +0200 (CEST), dd3ly at 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