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QRV since 1993.

You need a VNA to measure the final results and for tuningen of the coils.

First make a pick up coil for the vna to measure the resonance of a filter unit.
This is a coil of 3 turns Cu annealed  wire with about 20mm diameter It is connected to a small size coax.
The value of the coil isn’t critical at all.

Isolate the coax/solder joins with tape to avoid DC contact to the coil under test.


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