Here my list to "my leader":
http://www.rusarm.ru/cataloque/air_def/air_def.pdf

For PMU1 is stated 300 km detection range (but true 83M6E Command and Control System)... So, the mistery remains...

....Aaaand today's inteligence report:

http://www.au.af.mil/au/awc/awcgate/maxwell/mp30.pdf

guys this is my training video sa-4 ! i make it with camatsia program

of course i did it around 1 year ago ! but i upload this at rapidshare now

https://rapidshare.com/files/339575081/capture-6.avi

enjoy

Out-dated. Does not take golden eagles into consideration.

Just upload it to Youtube, and I will share it in the SAMSIM website.
Nice shot.

IMHO:

As the main question was concerning Stealth vs modern SAMs (S-300P/Patriot)...

In the '70s during the development of these fundamentally-new, digitally controlled phase-arrayed, multi channel SAM systems were aimed to counter Jamming, ARM's, and Weasels.
The AN/MPQ-53 and 30N6 (Flap Lid of SA-10) designs answered these challenges, by significantly reducing transmitted power (negating side/back-lobe HARM shots), and narrowed down monopulse pencil-beams (disabling track breaking efforts).

When the Stealth appeared, during the '80s, both system (Patriot/S-300P) fire control radars needed a major redesign, to counter these new threat effectively.
The Patriot PAC-3 system received the AN/MPQ-65 set, while the S-300PM received the (Tomb Stone SA-20) fire control radar.

My educated guess is that...
Patriot PAC-1 and PAC-2
S-300PT (SA-10A) and S-300PS/PMU (SA-10B)
... has limited capability against Stealth, as they were designed against (TBM's, ECM, ARM's,and Weasels).

While on the other side...
Patriot GEM/PAC-3
S-300PM/PMU1 (SA-20A) and S-300PMU2 (SA-20B) and S-400 (SA-21)
... is ready to meet the Stealth challenge.
(as they are designed to counter it)



ps: just like a speed bump...

If you have something more recent, Welcome...

There's nothing out on the internet.

Finally! Apologies, just took me a while to find it again:

http://pdf.aiaa.org/preview/1979/PV1979_91.pdf

Hpasp, this is very interesting, and certainly very plausible assumption! Thank you for this information!
Meanwhile I also made some (very amateurish) research. There is a lot more info about aircraft radars, even the newest ones, than about SAM radars, so I decided to make some comparison and interpolation of data. The Zaslon radar, of MiG-31 fighter (which is the same period technology as the S-300's 30N6), is stated to have average power output of 2,5 kW, and detect MiG-21 class target at 130 km distance, which means that a target with RCS of 0.0034 square meters (as I mentioned earlier, this figure was given as an average for F-22 Raptor by one man who supposedly have an access to restricted information in Russia) will be detected at about 20-25 km range, if my calculations are correct.
The latest Irbis radar, intended for Su-35BM aircraft, has an average power output of 5 kW and peak power of 40 kW, and is claimed to be able to detect a target with RCS of 3 square meters (MiG-21 class) at whopping 350-400 km. This means that F-22 will be detected at the distance of some 70-80 km. The Irbis is also lighter and more compact radar, than the Zaslon, which can only be installed on massive MiG-31. The Irbis is the same-generation system, as the S-400, so I might guess that performance leap from S-300PS to S-400 can be comparable to that from Zaslon to Irbis.

^^^^

But it probably has some issues when it comes to useage. In any case, I believe those figures are all for look-up cases in clear weather. This is significant because a look-down situation can drop the detection range by 1/3rd.

Also, there seems to be some sort of difference between detection and tracking that is not well explained, and tracking distances are shorter :/

In addition, IIRC, the IRBIS detects warships at 400km, but not fighters. Just IIRC. I need to find out why I remember something like that, but I'm pretty sure I saw a brochure of it that dispelled the 'detection of aircraft at 400km' deal. But ... memory can fail, so I could be wrong.