• Convenient function keys and menu system
  By assigning frequently used functions to the two FUNC keys, you can promptly select different radar modes. The menu system also allows for easy selection of the different function choices.
• The latest technology in pointing device
  A newly developed pointing device that is both watertight and dust-proof is used. This device enables you to make an easy prompt selection of the variable range marker and other user functions.
• Freely selectable range scales
  The optimum range scale suit your present situation can be selected from a host of range scales choices available. No need to worry any more about the measuring distances.
• Own track indication, waypoint indication and picture mode selection make navigation easy
• By connecting your navigation system and electric compass or gyrocompass, you can display your waypoint and own vessel's track on the display. North up, course up, head up and true motion modes are also available.
• The location memory can be conveniently used for finding buoys for rescue work
• The system memorizes the location of your boat when the FUNC key is pressed. This function is especially effective for relocating someone who has fallen overboard or returning to previously dropped buoys (connection to a navigation system is necessary).
• Warning zone setting to alert you of closing events.
  By designating two points using the cursor, a flexible warning zone can be created. An IN and OUT alarm mode can also be selected.
• Intermittent transmission watch
  The intermittent transmission function is located in the SAVE mode. This feature is particularly useful for watch keeping under reduced power consumption.
• Two-speed antenna rotation makes quick moving, long-distance target detection possible (MD-3642 only) # A choice between 50 rpm and 25 rpm antenna speeds enables the system to carry out stable target detection even on a high-speed boat at short range. Long distance sensitivity is also improved. High resolution targeting and upgraded receiver performance (MD-3642 only) The IF amplifier performance has been upgraded to enhance targeting and detect hazards such as buoys at short distances.

KODEN MD-3641/MD-3642 Display Specifications

Display

10-inch diagonal green monochrome high resolution CRT

Resolution

480 x 640 pixels

Video level

8 levels

Presentation mode

Head-up, *north-up, **course-up, ***true motion

Range scale (nm)
Rings interval (nm)

Range scale (m)
Rings interval (m)

MD-3441
MD-3442

MD-3641
MD-3642

1/16, 1/8, 1/4, 1/2, 3/4, 1, 1.5, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48
1/32,1/16,1/16,1/8,1/4,1/4,1/4,1/2,1/2,1,1,2,2,4,4,8,8
emphasized: MD-3642

125,250,500,1k,1.5k,2k,3k,4k,6k,8k,12k,16k,24k,32k,48k,64k,96k
25,50,100,200,300,500,origin 1k,1k,2k,2k,4k,4k,8k,8k,16k,16k
emphasized: MD-3642

Off-centering

Sweep origin can be moved in any direction.

Echo trail interval

Continuous, 15, 30 sec., 1, 3, 6 min., OFF

Alarm

IN and OUT alarms

Minimum range

Better than 20 m(66 feet) on 1/8 nm range

Range discrimination

Better than 20 m (66 feet)

Range accuracy

Better than 7 m (23 feet) or 0.8% of the maximum
range of the scale in use, whichever is greater.

Bearing accuracy

Better than +1º

Navigation data display

Boat position (L/L, Loran C LOP) or bearing/speed

Other functions

Gain, STC, FTC, heading marker off, Interference rejection, target expansion, zoom, two VRMs, two EBLs (0.1° step), floating EBL/VRM, cursor position (latitude/longitude), parallel cursor, steering/distance of target (true/relative), distance unit (nm/km, signal processing, waypoint display, location memory, intermittent transmission.

Input Data Format

NMEA-0183,(BOD, BWC, GGA, GLL, GTD, HCC, HDM, HDT, HSC, VHW, VTG, WDC, WPL), NMEA-0182, CIF, JRC

Power supply

11 to 40 VDC

Power consumption

MD-3641: Approx. 55W or less @ 24VDC
MD-3642: Approx. 85W or less @ 24VDC

Environmental condition

Temperature: -15º to +50ºC (5º to 122ºF)
Relative humidity: 95% at 35ºc (95ºF)

* North up, ** Course up: Bearing data from electric compass, gyro compass or a navigator is required.
*** True motion: speed data from speed log, and Bearing data from electric compass, gyro compass or a navigator is required.

KODEN MD-3641/MD-3642 Antenna Specifications

Model

MD-3641

MD-3642T

MD-3642F

Antenna

1.8ft (radome)

3.5ft (open scan)

4.5ft. (open scan)

Peak power output

4kW

Frequency

9410 +30 MHz

Beam width
 

Horizontal

4º

2.4º

1.7º

Vertical

25º

Rotation

24 rpm

50 rpm(pulse length:S,M1)
25 rpm(pulse length:M2,L)

Pulse length (µsec) S:
/PRH (Hz) M1:
M2:
L:

0.1 / 2000
0.25 / 2000
0.5 / 1000
1.0 / 500

0.06 / 4000
0.15 / 2000
0.4 / 1000
1.0 / 500

IF amplifier

60 MHz

IF band width S,M1
M2,L

6 MHz
3 MHz

20 MHz
5 MHz

Noise figure

6 dB nominal

5 dB nominal

Environmental condition

Temperature: -25º to +55ºC (-13º to 131ºF)
Relative humidity: 95% +35ºC (95ºF)

Operate in wind

100 knots

70 knots

• Dual speed antenna
  By using two levels of antenna speeds you have an optimized target reception capability, i.e., on short range, the 50 rpm speed provides faster update of the targets approaching or passing nearby, promising a secured watch and safer navigation in close range. With 25 rpm speed, the targets will be illuminated for relatively longer period of time by the slower speed, This causes the targets to be presented strongly on the screen. This speed is also good for long range observation.
• Function keys and menu system
  By assigning your most frequently used functions to the two FUNC keys, you can quickly access favorite radar functions. The menu system also makes for easy selection of the different menu choices.
• The pointing device
  Newly developed pointing device allows the setting up of the off-centering position, pointing cursor, etc. in quicker and more accurately.
• Optional range scales
  In addition to the standard range scales you can add optional ranges to your needs via the menu.
• GPS receiver module built-in
  A GPS receiver module can be built-in to the display unit. No external connection is needed except the GPS antenna cable. By using a GPS receiver, the radar can be upgraded to provide various navigational information, including your position, etc., plus various radar picture modes includes north up, course up and true motion displays.
• Man-Over Board function
  By assigning the MEMO L/L function to either of the FUNC key, you can immediately enter your current position by pressing the assigned key. (The GPS receiver module must be connected) This function is particularly useful for locating a "Man-Over Board".
• Flexible warning zone setting
  Warning zone can be created easily by designating two points using the pointing device anywhere on the screen. The alarm zone can be set either IN or OUT alarm mode.
• Improved receiver performance
  The performance of the receiver section has been improved to provide a higher definition picture on short range and to enhance the long range performance as well. Wide picture area The 180mm circular area is maintained across the screen for radar picture presentation for better observation.