Furuno 841 MARK-2 manual Specifications, Antenna Unit, Transceiver Module contained in radome

SPECIFICATIONS

Antenna Unit

1.Radiator Printed array

2.Radiator length 54 cm

3.Horizontal beamwidth 3.9°

4.Vertical beamwidth 20°

5.Sidelobe

-20 dB within main lobe -23 dB outside main lobe

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 MG5248, E3571 or MAF1421B

2.Frequency

9410 MHz ±30MHz, P0N (X band)

3.Peak output power 4 kW

4.Pulselength & pulse repetition rate 0.08μs, 2100 Hz (0.25, 0.5, 0.75, 1, 1.5 nm)

0.3μs, 1200 Hz (1.5, 2, 3 nm)

0.8μs, 600 Hz (3, 4, 6, 8, 12, 24, 36 nm)

5.Warm-up time 2:30

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), 36 (6)

4.Bearing resolution 4°

5.Bearing accuracy Better than 1°

6.Range discrimination Better than 25 m

7.Range ring accuracy

0.9% of 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),

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