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909 B
909 B
| title | summary | coverCaption | date | lastmod | showBreadcrumbs | showReadingTime | showWordCount |
|---|---|---|---|---|---|---|---|
| Homebrew common mode choke | A simple and quite tiny common mode choke that I built for my portable operations. | My selfmade common mode choke placed into a neat plastic case with BNC connectors. | 2023-10-26T13:36:26+02:00 | 2024-03-31T11:02:19+0000 | true | false | false |
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.
{{< figure src="logmag_through.png" caption="The maximum loss is on 10m around 0.2dB" >}}
{{< figure src="logmag_outer.png" caption="It attenuates common mode current with more than 20dB" >}}
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.