Display unit – Furuno 841 User Manual
Page 8
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9. Receiver front end
MIC (Michoeave 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
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)
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. Ambiont 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
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