Homebrew common mode choke
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![](/equipment/accessories/homebrew-common-mode-choke/choke-feature_hu4f8fc4d86cb7e9d2f1fccd34d3f8aa17_317308_660x0_resize_q75_box.jpg)
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 recently.
![](/equipment/accessories/homebrew-common-mode-choke/logmag_through_hu6e7591afdc284a42226f5664ba6d1634_18480_660x0_resize_box_3.png)
![](/equipment/accessories/homebrew-common-mode-choke/logmag_outer_hu48db969b747880901534c3c26570af3d_17988_660x0_resize_box_3.png)
I find this okay for now but I still wonder if this can be made any better (maybe 30dB attenuation?). Would I benefit from even more attenuation?
I will probably find out on another day.