After looking for 2 weeks for the source of
noise that was producing an s-5 noise from
3 to 8 MHz on the dial of my older Icom I
found the source. My Dewalt cordless drill
drop-in battery charger. Apparently this charger
uses a rather harmonic-rich power supply and
charging circuit. Remove the battery and unplug
the charger and the noise disappears. Any of
you having a Dewalt cordless drop in may want
to check this also.