On Thu, Nov 14, 2019 at 02:06 PM, David F4HTQ wrote:
" The values do not match those of the constructor curve ( to have the right value the software might know the exact geometry of the inductor) , but the shape is absolutely identical.
This allow to easy identify unknown ferrite core, and to better understand how to use it in a RF device.
For example, here is the true curve of material 43 of Fair rite.
And here's the one I got with NanoVNASaver
------------------------------------------------------------------------------------------------------------------------------------------------
David that helps to explain the purpose of the new charts. I was wondering if you might answer the following questions when you get some time.
1. I visited your web site but did not see an article about ferrite core measurements. What test set-up did you use to generate the Complex-Perm-vs-Freq plots?
2. Since you used the shape of the curves rather than the permittivity values to identify the type material, do you have atypical plots for different material types (i.e. 31, 43, 61) and how well did they match the corresponding Fair-rite corporation curves?
I also have accumulated numerous ferrite material over the years. Some marked but the majority unmarked. I'd love to have a way of sorting them by type and doing so visually by the shape of their curve, as you propose, would be good enough for me.
Regards,
- Herb
