Having heard about the GM3SEK mains filter at the RSGB Convention 2019 and seen the design on his web site I had decided to build one. I gathered most of the necessary parts after Christmas. The one missing item were cable ties with screw holes to hold the ferrites in place. I finally found some on ebay so set about assembling. I decided to fit a 16A chassis mount plug and socket on the box to make it more transportable, the mains input and the distribution panel output having connectors to allow easy disconnection
