3 - 30 MHz Choke

[VK2CSW]

I decided to knock up a common mode choke as I think I am getting some RF in the shack, especially around the 15, 12 and 10m bands.

I got some bibs and bobs and put together a double stacked FT140-43 with 15 bifillar turns of 1.25mm2 enamel wire.

Sadly the SO235 connectors turned out to be the bodgey M16 versions, so final assembly is on hold.

The NanoVNA results look pretty good.