JRC JMA-2343, Instruction Manual

Page: 238 / 310

222
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 0.08
μ
s /2250Hz (0.125, 0.25, 0.5, 0.75, 1.5NM)
0.25
μ
s/1700Hz (1.5, 3 NM)
0.5
μ
s/1200Hz (3, 6 NM)
1.0
μ
s/650Hz (6, 12, 24, 36, 48 NM)