Here a link abt F-5S AIM-120 capability:
These fighters might also receive a new EL7M-2032 radar system,
competing with the Italian FIAR Grifo-F, 35 of them have been sold
to Singapore to upgrade its Tiger II..............
Italian X-band Grifo-F radar. The system is particularly designed
to meet the need to improve the capabilities of various not so
up-to-date second generation jet fighters, like Mirages, Mig-21s,
and, of course, F-5s, including the possibility to use air-to-air
active radar guidance AIM-120 AMRAAM. The Singapore Air Force
adopted for its F-5 Tiger II the Italian radar
Grifo-F...........
http://www.analisidifesa.it/numero4/eng/f5eng.htm
Here another link with better detail :
http://home.att.net/~jbaugher1/f5_38.html
BTW , Israeli only BVR AA missiles is Derby.
Better ? Not so sure.[/url]