Homebrew common mode choke
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So this is basically a 140-43 toroid with 9 turns of RG174 connected to BNC connectors.
It works very well and I have made two measurements:


Another picture with open case:

So this is basically a 140-43 toroid with 9 turns of RG174 connected to BNC connectors.
It works very well and I have made two measurements:
Another picture with open case: