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Description of the radar set, tactical-technical characteristics
frequency: 9 000 … 9 160 MHz
pulse repetition time (PRT):
pulse repetition frequency (PRF): 2 000 Hz
pulsewidth (τ): 0.5 µs
receiving time:
dead time:
peak power: 22 kW
average power: 220 W
instrumented range: 10 NM (≙ 18 km)
range resolution: 80 m, 1.2°
accuracy: 2%
beamwidth: course: β= 0.8°; ε= 2°
glide: ε= 0.5°; β= 3.6°
hits per scan:
antenna rotation: 2 AZ, 2 EL scans per second


The PAR-1 was the world’s first precision approach radar for civil airports.

It operated with two sector-swiveling antennas: a more oval one with horizontal polarization for the heading and a narrower one with vertical polarization for the glide path. Both antennas could be switched to circular polarization. One transmitter fed both antennas and used a mechanically tunable magnetron of type 2J51 operating in the X-band.

The radar supplied two workstations for air traffic controllers, each with a Beta Scan Scope equipped with a 10-inch picture tube for the close range (3 miles) and the far range (10 miles).

The radar was developed by Gilfillan in 1947 and built by ITT-Gilfillan after its merger with ITT. It was the direct predecessor of the AN/FPN-33 but was still reduced in the transmitter’s power.