If you compare it to the S-300PS Volhov-M6 (SA-10B), you can see the effort went into the optimization between 1978 and 1983...
Hpasp Free SAM Simulator, "Realistic to the Switch" (U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.) http://sites.google.com/site/samsimulator1972/home