T-core inductance winding patent

High frequency filter,

According to the number of coil diameters you provided, it should be UUU 15.7.

Generally, R8K or R 10K is used for such a high number of turns.

The inductance should be above 3mH,

If you only use it for yourself, you can use T22* 14*8 and other common specifications to wind one by yourself, mainly inductance.