Before the launch, the launcher is telling the missile (over the OS-10 plug), what to do during flight in case you receive K3 command.
When you set "Rabota ot VM", the missile will arm its radio proxy fuse after launch, and does not take care about K3 at all.
(this was originally developed for the case, when the enemy is continuously emitting K3 signals as jamming)
When you set "TT-I87", the missile will arm its radio proxy fuse after K3 received.
(difference to the normal settings is the distance from the range boresight, when the K3 is emitted)
I will try to translate what was written about later, if you are interested, but what I understand is that switchig "Rab ot VM" in "TT-i87" before or after 22 second of missile flight, activated diferent antena pairs of radiofuse (due to missing data for missile-target approach speed)... (I was just going to ask should we see a speed on the round instrument on "Q" screen in T/TI-87 mode, and this thing poped-up...)
