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AN/APS-120

Description of the radar set, tactical-technical characteristics

Figure 1: E2C with the APA-171 rotodome of the radar AN/APS-120

Figure 1: E2C with the APA-171 rotodome of the radar AN/APS-120

Specifications
frequency: 406 … 450 MHz
(UHF-band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 298 … 303.5 Hz
pulsewidth (τ): 12,8 µs
receiving time:
dead time:
peak power: 1 MW
average power: 3.8 kW
instrumented range: 200 NM (≙ 370 km)
range resolution:
accuracy:
beamwidth: 6.6°
hits per scan:
antenna rotation: 6 rpm
MTBCF: 18 hrs
MTTR: 8 hrs

AN/APS-120

AN/APS-120 is operating in the UHF-band airborne Air & Surface Search, Long-Range Pulse Doppler early warning radar used in Northrop-Grummans E2B and E2C Hawkeye.

The block diagram of the radar is identical to the predecessor types AN/APS-96 and AN/APS-111 (XN-1). The antenna was located in a radome above the aircraft fuselage with a diameter of 7 feet and a height of 2.5 feet. It consisted of a group of horizontally polarized Yagi antennas connected as a monopulse antenna. The fully coherent transmitter used a coaxial amplitron as a power amplifier. The radar signal processing used pulse compression down to a pulse duration of 0.2 µs.

The radar AN/APS-120 was operational in 1970 and was replaced in 1976 by the AN/APS-125.

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