Need help picking Ferrite material

[amdx]

Re: the dc saturation controlled variable inductor
Low power inductor, receive antenna signals.

I've decided to try an EFD shape core, reasoning for the choice; I can
turn one side 180*, the center leg over lap area is reduced to 14%.
My theory is, that reduce area will saturate at lower flux.

Is that reasonable?

I don't have a lot of material choices.
TDK material
Available materials, N87 and N97
Material data here

https://www.tdk-electronics.tdk.com/en/529404/products/product-catalog/ferrites-and-accessories/epcos-ferrites-and-accessories/ferrite-materials

Fair-rite
Available material, 78
Material data here
> https://www.fair-rite.com/78-material-data-sheet/

Which of those materials will work from 500kHz to 4MHz as a 100uh inductor?


If you would like to educate me,
Does the permeability curve relate to how well a material will perform
as an inductor over frequency?

Or, ask another way, For a given material Does AsubL fall off as
frequency increases like it's permeability curve?

Thanks, Mikek

 

[Randy Day]

In article <qjrdr4$h06$1@dont-email.me>, nojunk@knology.net says...

[snip]

Not sure if this helps, but we've had good
results using Magnetics Inc. cores in our
devices.

https://www.mag-inc.com/

HTH

 

[amdx]

On 8/24/2019 12:22 PM, Randy Day wrote:

In article <qjrdr4$h06$1@dont-email.me>, nojunk@knology.net says...

[snip]

Not sure if this helps, but we've had good
results using Magnetics Inc. cores in our
devices.

https://www.mag-inc.com/

HTH

I see Material P and R in the EFD core.
But I can't any data sheets on P or R.
Same with Laird (Steward).
Mikek