49.87 (+0.70) 
The AN/APG-63 radar is a highly flexible, all-weather multimode radar.
The APG-63 radar combines long range acquisition and attack capabilities with automatic features to provide the instant information and computations needed during air-to-air and air-to-surface combat.
The APG-63 has been operational since 1973. In 1979, it was the first airborne radar to incorporate a software programmable signal processor (PSP). The PSP allows the system to quickly respond to new tactics or accommodate improved modes and weapons through software reprogramming rather than by extensive hardware retrofit.
The APG-63 is no longer in production but remains in service. Almost 1,000 APG-63s had been delivered when production ended in 1986. About 700 are still operational in F-15As, Bs, and early model Cs and Ds operated by the U.S. Air Force and the air forces of Israel, Japan, and Saudi Arabia.