Onwa KM-8C Multifunctional Marine Chart Plotter with Radar and Fishfinder Built-in Features

Radiator

Slotted waveguide Array

Slotted waveguide Array

Radiator Length

55 cm

46 cm

Antenna Rotation Speed

24 RPM (±2)

Long Range (3~36nm): 24 RPM (±2)
Medium Range (1.5~ 3 nm): 36 RPM (±2)
Short Range (0.125~1.5 nm): 48 RPM (±2)

Wind Resistance

Relative wind speed 100 knots(51.5 m/s)

Relative wind speed 100 knots(51.5 m/s)

Beam Width

Horizontal 4°
Vertical 25°

Horizontal 5°
Vertical 25°

Sidelobe

Within ± 20° off mainlobe; less than -18 dB
Outside ± 20° off mainlobe; less than -23 dB

Within ± 20° off mainlobe; less than -18 dB
Outside ± 20° off mainlobe; less than -23 dB

Polarization

Horizontal

Horizontal

Transceiver Module (contained in Radome)

Transmitting Tube

MSF1421B or MAF1421B

MSF1421B or MAF1421B

Frequency

9410 ± 30MHz (X-band)

9410 ± 30MHz (X-band)

Pulse Length PPR

0.08 µ S/2100 Hz(0.125, 0.25, 0.5, 0.75, 1.5 nm)
0.3µ S/1200 Hz(1.5, 2, 3 nm)
0.8 µ S/600 Hz(3, 4, 6, 8, 12, 16, 24, 36nm)

0.08 µ S/2100 Hz(0.125, 0.25, 0.5, 0.75, 1.5 nm)
0.3µ S/1200 Hz(1.5, 2, 3 nm)
0.8 µ S/600 Hz(3, 4, 6, 8, 12, 16, 24, 36nm)

Warm Up time

1:30 minutes

1:30 minutes

Peak Output Power

4 kW nominal

4 kW nominal

Modulator

FET Switching Method

FET Switching Method

IF

60MHz

60MHz

Tuning

Automatic or Manual

Automatic or Manual

Receiver front end

MIC (Microwave IC)

MIC (Microwave IC)

Bandwidth

Tx pulselength 0.3 µ S and 0.08 µ S: 25 MHz
Tx pulselength 0.8 µ S: 3 MHz

Tx pulselength 0.3 µ S and 0.08 µ S: 25 MHz
Tx pulselength 0.8 µ S: 3 MHz

Duplexer

Circulator with Diode Limiter

Circulator with Diode Limiter

WIFI Module (For KRA-1007W ONLY)

Standard: IEEE802.11n, IEEE802.11g, IEEE802.11b
Channels: 1~11
Frequency Range: 2.4-2.4835G
Transmit Power:15-20dBm

Environment

Temperature

Antenna unit: -25 to +70°C

Antenna unit: -25 to +70°C

Humidity

Relative humidity 93% or less at 40°C

Relative humidity 93% or less at 40°C

Power Supply 

10.5VDC to 40.0 VDC Built-in Power-Supply

10.5VDC to 40.0 VDC Built-in Power-Supply

Antenna Radiator

Radiator

Slotted waveguide Array

Radiator Length

KRA-4001: 120 cm
KRA-3002: 180 cm

Antenna Rotation Speed

24RPM

Beam Width

Horizontal:
KRA-3002: 1.2°
KRA-4001: 1.9°
Vertical
KRA-3002: 22°
KRA-4001: 22°

Sidelobe

Within ± 20° off mainlobe; less than -24 dB
Outside ± 20° off mainlobe; less than -30 dB

Polarization

Horizontal

Wind Resistane

KRA-4001: Relative Wind Speed 100 knots (51.5 m/s)

Transceiver Module (contained in Radome)

Transmitting Tube

KRA-3002: MSF1425
KRA-4001: MAF1422 or MSF1422

Frequency

9410 ± 30MHz (X-band)

Pulse Length PPR

0.08 µ S/2100 Hz(0.125, 0.25, 0.5, 0.75, 1.5 nm)
0.3µ S/1200 Hz(1.5, 2, 3 nm)
0.8 µ S/600 Hz(3, 4, 6, 8, 12, 16, 24, 36,48, 64,72 nm)

Warm Up time

1:30 minutes

Peak Output Power

KRA-3002: 12.5 kW nominal
KRA-4001: 6 kW nominal

Modulator

FET Switching Method

IF

60MHz

Tuning

Automatic or Manual

Receiver front end

MIC (Microwave IC)

Bandwidth

Tx pulselength 0.3 µ S and 0.08 µ S: 25 MHz
Tx pulselength 0.8 µ S: 3 MHz

Duplexer

Circulator with Diode Limiter

Environment

Temperature

Antenna unit: -25 to +70°C

Humidity

Relative humidity 93% or less at 40°C

Power Supply 

±12VDC external regulated power supply