On Fri,12/23/2016 9:59 AM, Bill Price wrote: > Any ideas as to how to solve this issue? Yes. Study k9yc.com/RFI-Ham.pdf NO ferrite simply clamped onto a wire is going to make a dent at 4 MHz. And there's no solution for motion-detecting stuff like that soap dispenser -- they're input circuitry is something very high Z and probably running wide open. 73, Jim K9YC