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8.2 Scanner Unit (NKE-249/250)
(1) Dimensions
NKE-249
Diameter 620mm
Height 275mm
NKE-250
Swing circle 1220mm
Height 432mm
(2) Mass
NKE-249 Approx. 10.5kg
NKE-250 Approx. 24kg
(3) Polarization Horizontal
(4) Directivity characteristics
NKE-249
Horizontal beam width 4˚
Vertical beam width 25˚
Side lobe level
21dB maximum (less than ±10
˚
from main lobe)
NKE-250
Horizontal beam width 2˚
Vertical beam width 30˚
Side lobe level
23dB maximum (less than ±10
˚
from main lobe)
26dB maximum (other than ±10
˚
from main lobe)
(5) Rotation
NKE-249/250 Approx. 27 rpm
(6) Transmitter frequency 9410±30MHz
(7) Peak power
NKE-249 4kw
NKE-250 6kw
(8) Transmitter tube
NKE-249 Magnetron : MSF1421B
NKE-250 Magnetron : MSF1422B
(9) Pulse length/PRF
NKE-249 0.08μs /2250Hz (0.125, 0.25, 0.5, 0.75, 1.5NM)
0.25μs/1700Hz (1.5, 3 NM)
0.5μs/1200Hz (3, 6 NM)
1.0μs/650Hz (6, 12, 24, 36, 48 NM)
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