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SPECIFICATIONS–
MODEL 821
Antenna Unit
1. Radiator
Printed array
2. Radiator length
40 cm
3. Horizontal beamwidth
5.7°
4. Vertical beamwidth
30˚
5. Sidelobe
Less than -20dB
6. Polarization
Horizontal
7. Antenna rotation speed
24 rpm
8. Wind resistance
Relative wind speed 100 kts (51.5 m/s)
Transceiver Module
(contained in radome)
1. Transmitting tube
Magnetron E3587
2. Frequency
9410 MHz ±30MHz, P0N (X band)
3. Peak output power
2 kW
4. Pulselength & pulse repetition rate
0.12µs, 2100 Hz (0.25, 0.5, 0.75 nm)
0.3µs, 1200 Hz (1, 1.5, 2 nm)
0.8µs, 600 Hz (3, 4, 6, 8, 12, 24 nm)
5. Warm-up time
1:30
6. Modulator
FET switching method
7. I. F.
60 MHz
8. Tuning
Automatic or manual
9. Receiver front end
MIC (Microwave IC)
10. Bandwidth
7 MHz
11. Duplexer
Circulator with diode limiter
Display Unit
1. Indication system
PPI raster scan
2. Display
8-inch diagonal LCD, STN semi-
transparent, yellow mode
3. Range scales (nm)
Range, Ring Interval: 0.125(0.0625),
0.25(0.125), 0.5(0.125), 0.75(0.25),
1(0.25), 1.5(0.5), 2(0.5), 3(1), 4(1),
6(2), 8(2), 12(3), 16(4), 24(6)
4. Bearing resolution
6.2˚
5. Bearing accuracy
Better than 1˚
6. Range discrimination
Better than 25 m
7. Range ring accuracy
& discrimination
0.9% or range in use or 8 m,
whichever is larger
8. Minimum range
Better than 37 m
9. Markers
Heading marker, Bearing scale, Range
ring, VRM, EBL, Waypoint (option),
Tuning indicator, Alarm zone, Cursor
10. Alphanumeric indication
Standard: Electronic Bearing Line
(EBL), Echo Stretch (ES), Rain
Clutter Rejection (FTC), Alarm
(G), Interference Rejection (IR),
Stand-by (ST-BY), Echo Trail Time
(TRAIL), Variable Range Marker
(VRM), Range, Range Ring Interval,
Range and Bearing to Cursor (+), Off
Center (OFF CENTER), Watchman
(WATCHMAN)
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