The AN/APG-66 radar is a solid state medium range (up to 150 km) Pulse-doppler radar designed by Westinghouse (now Northrop Grumman) for use in the F-16 Fighting Falcon and in the U.S. Customs and Border Protection's C-550 Cessna Citation and Piper PA-42 Cheyenne II's. The system consists of the following line replaceable units:
* Antenna
* Transmitter
* Low-power radio frequency
* Digital signal processor
* Radar computer


Per the Joint Electronics Type Designation System (JETDS), the AN/APG-66 nomenclature is derived thusly:
* "AN/" tag indicates the nomeclature is derived from the JETDS
* "A" indicating a system intended for use in manned aircraft
* "P" indicating the system is a radar
* "G" indicating a fire control radar
* "66" as an arbitrary numerical designator


* Frequency: 6.2 to 10.9 GHz
* Search cone: 120 degrees × 120 degrees
* Azimuth angular coverage: ±10 degrees / ± 30 degrees / ± 60 degrees
* Weight: 98 to 135 kg depending on configuration
* Volume: 0.08 m³ to 0.102 m³ depending on configuration


* APG-66(T47) - installed in Cessna OT-47B.
* APG-66(V)2 - upgrade of base radar. New signal processor, higher output power, improved reliability. Range in clutter/jamming environment increased to 83 km.
** ARG-1 AN/APG-66(V)2 downgraded variant of the APG-66, designed for the Argentine Air Force A-4AR Fightinghawk
**APG-66(V)2A - AN/APG-66(V)2 with a new combined signal and data processor that provides seven times the speed and 20 times the memory of the older radar computer and digital signal processor line replaceable units. In this new variant, the displayed resolution in ground-mapping mode is quadrupled, and is reported to be close to that offered by Sar techniques. Used for modernization of F-16A/B fleet of Belgium, Denmark, Norway and the Netherlands in the mid-1990s.
* APG-66(V)3 - as APG-66(V)2 but with CW illumination capability, possibly for export to Taiwan.
* APG-66(V)X - improved version of the APG-66(V)2/3 radar with greater detection range.
* APG-66H - installed on BAE Hawk 200 aircraft, smaller antenna, giving slightly reduced capabilities.
* APG-66J - configured for the Japanese F-4EJ upgrade program.
* APG-66NT - installed on Navy T-39N aircraft.
* APG-66NZ - installed under the Project KAHU on New Zealands A-4 Skyhawk aircraft.
* APG-66SR
* APG-66SS
* APG-66T - multi-target track while scan variant.
* APQ-164 - designed for the B-1 Lancer bomber, with a passive electronically scanned array.

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