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RF choke in RF amplifier, how material?

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berger.h

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I have RF amplifier 15MHz , working from DC+50V to 50ohm Load.
N-MOSFET transistor have in drain RF choke.
Choke is toroids OD 24mm Ht 7mm (any as T94) painted on White, 11 turn , I measute L=12.4uH
Question is how type material is used?
I have yet found
1. Ferrite **broken link removed** AL=87 [nH]
2. Senddust any as **broken link removed** AL=90 [nH]
Anby other
3.May be HI-FLUX core H090-125A Al=90 [nH]
4 any other ferrites unfortunately I do not found a commercially available replacement for 4C65 (Ferroxcube)
5 Iron powder T94-52 Al=57 [nH], but I thing Iron powder have for this big core lost

Unfortunately, I do not know what rules are selected core parameters in this type coils?
Can you help me
qwe.png
 
Last edited:

Hi berger,

How do you make the inductance measuremetns you mentioned above? This is important because ferrite core materials has a very frequency dependent permeabilities.

Here is my opinion about the topic,

In order to charecterize your core material, you have two main steps to follow.

1) Measuring magnetic core's B-H Curve at some specific frequencies.

2) Measuring your magnetic core's complex permeability. This is a frequency dependent measurement.

After this measurements you have some curves depending field strength (H,A/m) and frequency(Hz). You can compere this curves with known curves (known core material properties) of interest.

I know these steps are very time consuming but I have no effective idea about characterizing your core material other than these steps.

Hope this helps,
 

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