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AN/APS-125

Description of the radar set, tactical-technical characteristics

Figure 1: E2C (Group 0) with AN/APS-125

Figure 1: E2C (Group 0) with AN/APS-125

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: 3.84 kW
instrumented range: 250 NM (≙ 460 km)
range resolution:
accuracy:
beamwidth: 6.6°
hits per scan:
antenna rotation: 6 rpm
MTBCF: 100 hrs.
MTTR: 12 hrs.

AN/APS-125

AN/APS-125 is operating in the UHF-band airborne Air & Surface Search, Long-Range Pulse Doppler early warning radar used in in later E-2C Hawkeye aircraft and replaced the AN/APS-120.

The radar has the same 24-ft (7.93 m) diameter rotodome mounted above the fuselage. It is even more complex than the APS-120, it provides automatic overland detection and tracking capability, and it contains many passive protection devices against counter-measures. The AN/APS-125 must pass a 100 hour system burn-in under cycled vibration, temperature, and operate periods to improve the poor service life of the APS-120.

It received a modernization that increased the instrumented range to 300 NM (≙ 550 km) and was then named AN/APS-138 in 1984. The E2C Hawkeye was then referred to as Group 0. Further modernization of radar data processing led to the designations AN/APS-139 respective E2C Group 1.

The APS-125 was operational in 1978 and was replaced by its successor, the AN/APS-145, in 1988.

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