Furuno 841 User Manual download pdf (Page 6)

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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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