Home-brew Filter for a High Current Battery Charger 
built by Richard Battles - WB4BYQ 
This filter is for a high current battery charger on my neighbors boat. When the charger is plugged into the 120 outlet it destroys most of 20 meters. He has offered to buy a new charger, but I wanted to see if I could fix the RFI and learn about common-mode filters. This is a three stage FT-240-77 core filter.
Webpage designed by KC0ONR 
Marshall County Alabama Repeater Systems