I'm not familiar with "S meter lite" so I can't compare, but I track RFI simply by setting the panadapter rate as slow as possible. I can then scroll back about a day. It's a bit of a pain to.coordinate multiple panadapters but not terribly so. I also like to use.the greyscale color map for this too. What's really nice is that even after scrolling back a few hours, gain and colors can be adjusted.