Specifications– model 841, Antenna unit, Transceiver module (contained in radome) – Furuno 841 User Manual
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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
SPECIFICATIONS–
MODEL 841
Antenna Unit
1. Radiator
Printed array
2. Radiator length
54 cm
3. Horizontal beamwidth
4
°
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
0.08
µ
s, 2100 Hz (0.25, 0.5, 0.75 nm)
0.3
µ
s, 1200 Hz (1, 1.5, 2 nm)
0.8
µ
s, 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
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