Furuno 841, 821 manual SPECIFICATIONS- Model, Antenna Unit, Transceiver Module contained in radome

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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