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1L117

Description of the radar set, tactical-technical characteristics

Figure 1: 1L117

Figure 1: 1L117

Specifications
frequency: 2 695 … 3 115 MHz
(S-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 375 or 750 Hz
pulsewidth (τ): 1.2 µs
receive time:
dead time:
peak power: 5 × 700 kW
average power:
instrumented range: 450 km
range resolution: 125 m
accuracy:
beamwidth:
hits per scan:
antenna rotation: 6 or 12 min⁻¹
MTBCF: 350 hrs
MTTR:

1L117

1L117 (NATO designator: „Big Bar”) is operating in S-Band long range 3-D air surveillance radar. It is a further development or a modification of the P-37 „Bar Lock” in the transistorized version of 1990.

While retaining the essential advantages of the P-37 radar systems, such as low price, reliability, simplicity and ease of operation, the system has been given new properties and improved technical data. A visual distinguishing feature is the upper antenna, which is turned clockwise by approximately 45°. This V-Beam method enables the height to be determined in the plotextractor which can automatically detect up to 200 targets.

The modification 1L117M uses a klystron as a transmitter output stage in contrast to its predecessor model (five magnetron transmitters). Thus this version became a fully coherent radar. Improvements include a more stable output signal and a higher subclutter visibility of 45 dB (instead of 25 dB).

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