GM3SEK Mains Filter

Interference received on HF radio is a real problem in todays urban environments and proliferation of cheap, unfiltered, Chinese electronics with untested fake CE markings.

Making your station as electromagnetically robust as possible to RF interference (both receiving and transmitting) is essential practice.

GM3SEK talked about the issue in detail at the RSGB conference in 2019. He has provided this information and the instructions to make an excellent mains filter on his page. (Link Below).

Below are some photos of my own construction of the GM3SEK Mains filter.