Just to stop spreading rumors...
... F117 was detected on the P18.
It was tracked with the SNR (Karat was not used that time), two missiles were launched with T/T guidance method, and one killed it.
After the missiles were launched, the target started a gentle climb, with a moderate left turn.
(this action did not influenced the missile guidance)
There were no jamming.
The only trick is at the Neva SIM documentation, where it states the Neva detection range against a MiG21.