When the F-14's are doing their loop, their speed drops down, so in (MHI) "Mono-Chromatic Emission" mode (English manual page 15), the CW radar will loose them.
Maybe you should better state that their speed
relative to a 5N62 drops and go below zero.
Correct!

We as a CW radar FCO's, are
always considered about "Angular Velocity of the Target".