now I'm going to try and explain this in monkey terms. The two people that explained it to me were/ are very smart, and as hard as I tried to take notes it was a bit over my head. Whistler kind of takes the stand point of "alert the driver" while "we" take a look at a second or third set of prints. I was told v1 did or still has a J?? feature that went of on KA but then flashed J to say after a second look it was not a KA signal. Some of the hard core v1 guys/gals can probably explain that better @CJR238 or @benzr i belive are the v1 guroos. So the whistler 97 at least scans k band, 35.5, and 33.8 in one sweep, since 34.7 in a more common gun, from what i understand, it kind of sits off to its self. So back to my point, as the whistler is scanning it sees something that might look like a KA signal, it alerts, looks at the next frame, and adjust it's alerts by flashing ####. As the signal changes that's why it goes back and forth at times. Mike said he doesn't run with FDSR on unless he wants more information, he said it (the detector) can get a little on the chatty side with it on. The more filters a person puts on, the more frames the whistler takes time to look at, which can delay a signal. Without getting too far off topic, I was told escort for example takes a different stand point, they will hold a signal the extra time to analyze it, to keep a quite detector, but an I/O shot could punch thru. I hope this makes some kind of sense, if it doesnt, i will go back and try to be more specific with my questions, and take better notes.