[TowerTalk] Ferrite material Laird 28

[Richard (Rick) Karlquist]

What I meant by loosier is that in a common mode
choke, there would be more heat dissipation loss
with the Laird.  I did NOT mean that the series
resistance was higher.

I agree Fair-Rite's web site is by far the best
in the industry.

73
Rick N6RK

On 3/27/2017 12:07 PM, Jim Brown wrote:
> 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
>
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