Given this is the case too I just realized, this F-15C that we have must have the AN/APG-63(V)1 and not the AN/APG-63 PSP, as the first JHCMS installed on a F-15C occurred in 2005 and all the existing US F-15Cs were upgraded to AN/APG-63(V)1s by 2001.
Or they’ll just butcher it like they did with the F-15A, which should have TWS with the APG-63 PSP upgrade that it literally got at the same time as the countermeasures, yet it doesn’t have that radar upgrade in-game.
Artificially nerfed pre-psp apg 63
Flares (which only came on MSIP 1985 on C models as As were given to sent to the national guard)
and missile from early 80s
The last set of F-15Cs built has APG-70s from the factory. But the A2G features weren’t really necessary for USAF use and the radar was less reliable comparatively. Plus pulling them off the C-models meant they could be placed onto the E-models once that rolled out shortly after
The APG-70 was a APG-63 streamlined for reliability and had a few extra bells and whistles that dont help purebred fightercraft, the APG-63(V)1 took all the developments that the 70 and APG-63(V)2 made both software and reliability wise and installed it onto the base APG-63 frame for a far lower cost and its backwards compatible with existing APG-63s and PSPs.
TLDR it was cheaper and everyone, not just the US could get APG-70 performance or better out of their existing APG-63s.
1979 - Apg 63 psp(they removed the hardware radar signal processor unit 041 in exchange for a digital psp unit 042, memory was increased 4x, 24k to 96k, removal of some modes like LPRF and introduction others like RAM, )
1985 - MSIP happens (TWS, NCTR, RGH. . . memory increased to 384k, removal of RAM)
Apg 70(for strike eagles and last 43 C eagles coming from production plants in 1985). Apg 63 and apg 70 have basically the same A2A capabilities with the 70 having A2G.
1987 - (MSIP2?) memory increased to 512k, faster ADC, 2in1receiver exciter, amraam, MH sparrow, Vector Mode, expanded azimuth from ±60° to ± 75° during STT )
UP TO HERE the detection performance remained practically the same, 77 Nautical Miles(143km) for a 2m² target in RWS HPRF
Early 90s - apg 63 v1
Hardware changes to both 70/63 using VHSICs and other modules, new modes, updates etc.
Performance increased aswell.
164 - F-15Cs got retrofitted.