Originally posted by Lynx
It's not to stop voltage drop though it's to stop the micro fluctuations that are caused by the increased update rate of the digitals power pulses.
Just what will these micro fluctuations bother? Any rf will be bypassed out by the caps in the servo. You may see something on a 'scope but its not big enough or high enough in frequency to do anything.
Line loss due to high current surges is the problem. See my previous post for the cure