[TowerTalk] Ferrite material Laird 28

[Jim Brown]

On Mon,3/27/2017 4:46 AM, Richard (Rick) Karlquist wrote:
> I have measured various competitor's
> "equivalents" to material 43 and the found
> that they are considerably lossier. 

For common mode chokes, lossier is better. But so is the shape of the 
curve of loss vs. frequency, and so is resonant frequency. You either 
need to wind chokes and measure them or have graphs of mu' and mu'' vs 
frequency to compare with the Fair-Rite materials. Laird's website 
appears to be totally inscrutable with any of this, FAR, FAR, FAR behind 
Fair-Rite's. Laird's seems to have been done by a data guy, Fair-Rite's 
by an applications engineer who actually understands what's needed to 
choose a part and design using it.

73, Jim K9YC