[TowerTalk] Identifying ferrite core material

[richard@karlquist.com (Richard Karlquist)]

> I've managed to lay my hands on some ferrite cores.
> They were used to 'screen' multi-core
> computer/communication cables.
> 
> There are no markings.
> How can I work out what they are made of and what
> their permeability is ?  
>
> Robert
> g0hgw@yahoo.com

99% of the time, these things are Fair-Rite 43
or equivalent.  The permeability is 1000 up to
about a MHz, then they become mostly resistive.

Rick Karlquist    N6RK
richard@karlquist.com
www.n6rk.com
www.karlquist.com >