I couldn’t find much information about this “add-on” on internet or in written sources but i think it granted some sort of extra SAM CW and A-A CW (with limited IFF) launch/guidance detection and some more PRF based processing capability to the early Tomcat-As and some other Navy aircrafts such as F-4, A-4, A-6, A-7, etc. that utilized later versions of the AN/ALR-45 series RWRs.
Do anybody have more information about this “add-on”? How can Gaijin implement this to the game?