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|
|peak power:||22 kW|
|average power:||220 W|
|instrumented range:||10 NM (≙ 18 km)|
|range resolution:||80 m, 1.2°|
|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.