With navigation input (option): Course (CRS), Latitude and longitude, Speed (SPD), Range and bearing to waypoint (WP), Cross Track Error (XTE), Date and time, Water depth, Water temperature. (This radar has

only two data input ports. To receive data from more than two equipment install an mixing device.)

11. Vibration

 

Vibration freq.

Total amplitude

5 to 12.5 Hz

±1.6 mm

12 to 25 Hz

±0.35 mm

25 to 50 Hz

±0.10 mm

12.Ambient Temperature Antenna unit: –20˚C to +70˚C Display unit: 0˚C to +60˚C

Due to the inherent nature of the LCD its contrast may be affected under ambient temperature below 0˚C (32˚F) or above 50˚C (122˚F).

13.Humidity

Relative humidity 95% or less at +40˚C

14.Waterproofing

Display unit: IEC Pub no. 529 IPX5

Antenna unit: IEC Pub no. 945 class X

15.Power supply & power consumption

12 V or 24V(10.2 V to 31.2 V DC),

40 W approx.

16.Protection features

Protection against reverse polarity, overvoltage, overcurrent, and internal fault

17.Compass safe distance

Unit

Standard

Steering

 

compass

compass

 

 

 

Display

0.7 m

0.5 m

 

 

 

Antenna

1.7 m

1.4 m

 

 

 

SPECIFICATIONS– MODEL 841

Antenna Unit

1.Radiator Printed array

2.Radiator length 54 cm

3.Horizontal beamwidth

4.Vertical beamwidth 25˚

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

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 nm) 0.3μs, 1200 Hz (1, 1.5, 2 nm)

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

5.Warm-up time 2:30

6.Modulator switching method

FET

7.I. F.

60 MHz

8.Tuning

Automatic or manual

iv

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Furuno 821, 841 manual Vibration, Humidity, Waterproofing, Power supply & power consumption, Protection features