SA-5 vs RWR. Detection of missile launch seems to be unrealistic.

[macieksoft]

http://simhq.com/forum/ubbthreads.php/topics/3206692/SR-71_jamming_in_Operation_Gia

The Vega system emits the same signal from target acquisition till the impact of the missile.
RWR can only tell, that you are painted, it will never be able to tell you if a missile is launched against you.
The KRO signals are directed towards the RPC, so its signal may never been received by the target (at the opposite direction).

US had this knowledge (contrary to most of the military flightsim developers), and always assigned AWACS coverage to be able to detect any launch. During Operation Prairie Fire in Libya, this task was fulfilled by the NAVY’s AEGIS cruisers.

Well, the missile is semiactive. You should be able to detect Square Pair illuminating you but there should be no way for RWR to know if the actual missile has been launched as FCR emission do not changes. Its not like SA-2 or SA-3 when RWR could detect RPK (missile command transmitter), its a different system. It should not give any launch warn to you, much like it already is with SA-10.

Some guy suggests that there was also active variants of Vega:

Edit: jup, looked in the german wikipedia about the S 200, the 5W28 Missle has an active-radar seeker head, so the S-71 will be warned, if you lanch the missle with “V Polete” mode…

But this is not the case in BMS, if it would be you would see M symbol on RWR indicating actual active missile much like it is with AMRAAMs.
Anyway, HAPASP disregards info about active Vega:

Please, do not quote from Wiki, we are more serious here.