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AN/APG -68, AN/APQ=109

AN/APG -68, AN/APQ=109

AN/APQ109 is an improvement of the earlier AN/APQ-100 with an improved cockpit display able to handle TV imagery from weapons such as AGM-62 Walleye. Other significant additions included air-to-ground ranging, ground beacon identification and display capabilities.

The Aero 13 FCR designed for Douglas F4D Skyray is the origin of AN/APQ-120, and it established the configuration of the airborne FCR not only for the radar families of AN/APQ-120, but also a standard for all other airborne radars to follow: Aero 13 FCR was designed as an integrated cylindrical module that could be plugged into the nose of an aircraft, instead of a set of semi-independent black boxes.

The next radar to be installed on F-4 prototypes and pre-production series was AN/APQ-35, which was actually consisted of two radars: the AN/APS-21 search radar that could locate fighter-size targets at a range of 32 kilometers (20 miles), and the AN/APS-26 targeting radar, with a range of 3.2 kilometers (2 miles).

AN/APQ-36 is the improvement over earlier AN/APQ-35, and when AN/APQ-36 entered service on Douglas F3D Skyknight and Vought F7U Cutlass, it was the largest airborne FCR of its time. The more powerful AN/APQ-36 with large size did not have any problem being installed on F-4 prototypes, so that more powerful FCR of larger size would be developed.

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