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Description of the radar set, tactical-technical characteristics
frequency: 2 775 … 2 900 MHz
9 000 … 9 180 MHz
pulse repetition time (PRT):
pulse repetition frequency (PRF): 1 200 Hz2 400 Hz
pulsewidth (τ): 0.8 µs0.5 µs
receive time:
dead time:
peak power: 500 kW25 kW
average power:
instrumented range: 50 NM (≙ 92 km) 10 NM (≙ 19 km)
range resolution:
accuracy: 1%400 ft
beamwidth: 2.2°β= 57' ;ε= 33'
hits per scan:
antenna rotation: 15 and 30 min-1


The AN/FPN-28 and AN/FPN-28A are ground-controlled approach radar systems consisting of a search and a precision systems.

The search radar system operates in S-Band. It is designed to detect aircraft up to a maximum range of 50 miles and furnish precise information for directing the movement of the aircraft in azimuth to a predetermined point in space. From this point, the aircraft can be directed along a predetermined glide path to a point within 50 feet above an airport runway through the facilities of the precision system of the radar set.

The precision approach radar operates in X-Band. It is designed to provide precise information for directing the movement of aircraft in azimuth and elevation along a predetermined glide path to a point above an airport runway from which a landing can be completed under normal visual means and under all conditions approaching minimum visibility.