Japan Radio NKE250 Marine Radar User Manual Manual 2 of 4 for CKENKE250

Japan Radio Co Ltd. Marine Radar Manual 2 of 4 for CKENKE250

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Manual 2 of 4 for CKENKE250

174

3.3.10 In case of high waves

CAUTION

On short range scales, the setting of the sea surface clutter suppression should

not be advanced to an extent that results in complete suppression of all clutter.

Such a setting may suppress echoes from targets such as vessels or hazardous

objects in addition to echoes from the waves and thus impair detection.

When using the sea surface clutter suppression function, be sure that the sup-

pression level is set at the optimum.

When sea waves become high, echoes from the high waves (sea clutter) appear on the

PPI screen making it difficult to see image of echoes from vessels or other objects. Sea

clutter is increasingly prominent to the extent that its source is close to the ship.

By using the [SEA] control function or the "automatic sea surface" function, sea surface

clutter may be suppressed facilitating monitoring of the targets.

Manual sea surface clutter suppression

Manual sea surface clutter suppressionManual sea surface clutter suppression

Manual sea surface clutter suppression

(a) Turn the [SEA] control in the clockwise direction.

As the control is turned in the clockwise direction, suppression of sea surface

clutter increases.

Automatic sea surface clutter suppression

Automatic sea surface clutter suppressionAutomatic sea surface clutter suppression

Automatic sea surface clutter suppression

(a) Push the soft key

ＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳ

(b) Push the soft key 1 to select

Ａ－ＳＥＡ

Ａ－ＳＥＡＡ－ＳＥＡ

Ａ－ＳＥＡ

Sea surface clutter suppression is enabled depend on the condition of the image.

ＭＥＮＵ

ＭＥＮＵＭＥＮＵ

ＭＥＮＵ

key.

The soft key will return to the initial function display.

Sea clutter being displayed as

image due to high waves.

Sea clutter has been suppressed (the

image of the echo from the target has

also been suppressed).

175

3.3.11 Measuring the range to the target

To measure the range to the target, the operator may take one of the following actions.

• Use VRM (Variable Range Markers)

• Move the center of the VRM (floating EBL)

• Use the parallel line cursor

• Use the cursor

1. Using VRM

1. Using VRM1. Using VRM

1. Using VRM

• A VRM is a circle that is displayed on the PPI screen.

• Since the size of the VRM may be change at will using the upper or lower portion

of the cross key, the operator is able to measure the range of any desired target.

• This radar equipment is capable of displaying two VRM simultaneously (#1VRM

and #2VRM).

• The #1VRM and #2VRM are displayed, selected and erased using the

ＶＲＭ

ＶＲＭＶＲＭ

ＶＲＭ

key.

• Whether or not the #2VRM is enabled is set at the menu.

• A VRM can take on the following states:

The VRM is not displayed.

The VRM is displayed

The cross key is not in VRM mode.

The cross key is in VRM mode

The VRM to be used (#1VRM or #2VRM) is not selected.

The VRM to be used (#1VRM or #2VRM) is selected.

Measuring the distance from the ship using #1VRM

Measuring the distance from the ship using #1VRMMeasuring the distance from the ship using #1VRM

Measuring the distance from the ship using #1VRM

(a) Select "FIX" in the line "EBL1/VRM1" - the menu "FUNCTION".

The #1VRM value represents the distance from the ship.

The center of #2VRM is always fixed at the position of the ship.

Setting whether or not use of #2VRM is enabled

Setting whether or not use of #2VRM is enabledSetting whether or not use of #2VRM is enabled

Setting whether or not use of #2VRM is enabled

(a) Select "YES" in the line "VRM2" - the menu "FUNCTION".

Use of #2VRM will be enabled.

If "NO" is selected, use of #2VRM will be disabled.

Operating the #1VRM/#2

Operating the #1VRM/#2Operating the #1VRM/#2

Operating the #1VRM/#2VRM

VRMVRM

VRM

(a) Push the ＶＲＭ

ＶＲＭＶＲＭ

ＶＲＭ key.

Each time the VRM key is pushed, the VRM that may be operated using the cross

key changes sequentially between #1VRM and #2VRM.

The #1VRM/#2VRM that is currently enabled is the VRM value at the upper left

of the screen that is enclosed with dotted lines.

176

(b) Push the left or right side of the cross key.

This enables operating the VRM selected in (a).

• When the lower portion of the cross key is pushed, the size of the VRM will be

reduced.

• When the upper portion of the cross key is pushed, the size of the VRM will be

increased.

Erasing the #1VRM and #2VRM

Erasing the #1VRM and #2VRMErasing the #1VRM and #2VRM

Erasing the #1VRM and #2VRM

(a) Push the ＶＲＭ

ＶＲＭＶＲＭ

ＶＲＭ key.

• When both #1VRM and #2VRM are displayed.

Push the VRM key and enclose the value of the #1VRM or #2VRM that is to

remain on the screen with dotted lines.

• When either #1VRM or #2VRM is displayed.

Enclose the displayed #1VRM or #2VRM in dotted lines.

(b) Continue pushing the ＶＲＭ

ＶＲＭＶＲＭ

ＶＲＭ key.

The #1VRM or #2VRM selected in (a) will be erased.

2. Moving the center of the VRM

2. Moving the center of the VRM2. Moving the center of the VRM

2. Moving the center of the VRM

 Please refer to "3.3.14 Floating VRM and EBL" for the method of using the

floating EBL.

3. Changing the interval between the pa

3. Changing the interval between the pa3. Changing the interval between the pa

3. Changing the interval between the parallel line cursors

rallel line cursorsrallel line cursors

rallel line cursors

 Please refer to "3.3.15 Using the parallel line cursor" for the method of using the

parallel line cursor.

4. Using the cross hair cursor

4. Using the cross hair cursor4. Using the cross hair cursor

4. Using the cross hair cursor

 Please refer to "3.3.18 Simultaneously measuring the bearing, distance, and

travel time to the target" for the method of using the cross hair cursor.

177

3.3.12 Changing the range unit

With this radar equipment, the range unit measured using the VRM or cross hair cur-

sor may be selected from among the following.

NM (nautical miles)

KM (kilometers)

KY (kilo yards)

(a) Select among "NM", "KY", or "KM" in the line "RANGE" - the menu "DISPLAY".

(b) Push the ＭＥＮＵ

ＭＥＮＵＭＥＮＵ

ＭＥＮＵ key.

The menu setting has been completed.

3.3.13 Measuring the bearing of a target

To measure the bearing of a target, the operator may select one of the following actions.

• Use EBL (electronic cursor)

• Move and use EBL (floating EBL)

• Use the parallel line cursor

• Use the cursor

There are three modes in displaying the EBL bearing

• Relative bearing display : R

• True bearing display : T

• Magnetic bearing display : M

 For details on display of bearing, please refer to "3.3.16 Switching the EBL and

cursor bearing display among relative, true and magnetic bearing display

mode".

178

1. Using EBL

1. Using EBL1. Using EBL

1. Using EBL

• An EBL is a straight line that is displayed on the PPI screen.

• Since the bearing of an EBL can be changed at will using the left and right por-

tion of the cross key, the operator is able to measure the bearing of any desired

target.

• This radar equipment is capable of displaying 2 lines of EBL simultaneously

(#1EBL, #2EBL).

• The #1EBL and #2EBL are displayed, selected and erased using

the

ＥＢＬ

ＥＢＬＥＢＬ

ＥＢＬ

key.

• Whether or not the #2EBL is enabled is set at the menu.

• An EBL can take on the following states:

The EBL is not displayed.

The EBL is displayed

The cross key is not in EBL mode.

The cross key is in EBL mode

The EBL to be used (#1EBL or #2EBL) is not selected.

The EBL to be used (#1EBL or #2EBL) is selected.

Measuring the distance from the ship using #1EBL

Measuring the distance from the ship using #1EBLMeasuring the distance from the ship using #1EBL

Measuring the distance from the ship using #1EBL

(a) Select "FIX" in the line "EBL1/VRM1" - the menu "FUNCTION".

The #1EBL value represents the bearing of the target with the ship as point of

reference.

The point of reference of #2EBL is always fixed at the position of the ship.

Setting whether or not use of #2EBL is enabled

Setting whether or not use of #2EBL is enabledSetting whether or not use of #2EBL is enabled

Setting whether or not use of #2EBL is enabled

(a) Select "YES" in the line "EBL2" - the menu "FUNCTION".

Use of #2EBL will be enabled.

If "NO" is selected, use of #2EBL will be disabled.

Operating the #1VRM/#2VRM

Operating the #1VRM/#2VRMOperating the #1VRM/#2VRM

Operating the #1VRM/#2VRM

(a) Push the ＥＢＬ

ＥＢＬＥＢＬ

ＥＢＬ key.

Each time the EBL key is pushed, the EBL that may be operated using the cross

key changes sequentially between #1EBL and #2EBL.

The #1EBL/#2EBL that is currently enabled is the EBL value at the upper left of

the screen that is enclosed with dotted lines.

(b) Push the left or right side of the cross key.

This enables operating the EBL selected in (a).

• When the left side of the cross key is pushed, the EBL rotates in the counter-

clockwise direction.

179

• When the right portion of the cross key is pushed, the EBL rotates in the

clockwise direction.

Erasing the #1EBL and #2EBL

Erasing the #1EBL and #2EBLErasing the #1EBL and #2EBL

Erasing the #1EBL and #2EBL

(a) Push the ＥＢＬ

ＥＢＬＥＢＬ

ＥＢＬ key.

• When both #1EBL and #2EBL are displayed.

Push the EBL switch and enclose the value of the #1EBL or #2EBL that is to

remain on the screen with dotted liens

• When either #1EBL or #2EBL is displayed.

Enclose the displayed #1EBL or #2EBL in dotted lines.

(b) Continue pushing the ＥＢＬ

ＥＢＬＥＢＬ

ＥＢＬ key.

The #1EBL or #2EBL selected in (a) will be erased.

2. Moving the center of the EBL

2. Moving the center of the EBL2. Moving the center of the EBL

2. Moving the center of the EBL

 Please refer to "3.3.14 Floating VRM and EBL" for the method of using the free

floating EBL.

3. Changing the interval between

3. Changing the interval between3. Changing the interval between

3. Changing the interval between the parallel line cursors

the parallel line cursors the parallel line cursors

the parallel line cursors

 Please refer to "3.3.15 Using the parallel line cursor" for the method of using the

parallel line cursor.

4. Using the cross hair cursor

4. Using the cross hair cursor4. Using the cross hair cursor

4. Using the cross hair cursor

 Please refer to "3.3.18 Simultaneously measuring the bearing, distance and

travel time to target" for the method of using the cross hair cursor.

180

3.3.14 Floating VRM and EBL

Use the floating EBL function to move a VRM or an EBL.

Only #1EBL and #1VRM may be moved.

Setting the #1EBL and #1VRM to enable moving

Setting the #1EBL and #1VRM to enable movingSetting the #1EBL and #1VRM to enable moving

Setting the #1EBL and #1VRM to enable moving

(a) Select "FLOAT" in the line "EBL1/VRM1" - the menu "FUNCTION".

The point of reference of #1EBL and center of #1VRM is now movable.

However, the location of the point of reference of #1EBL and the center of #1VRM

is always at the same position.

Setting the point of reference and cent

Setting the point of reference and centSetting the point of reference and cent

Setting the point of reference and center position

er positioner position

er position

(a) Push the ＥＢＬ

ＥＢＬＥＢＬ

ＥＢＬ key or the ＶＲＭ

ＶＲＭＶＲＭ

ＶＲＭ key.

The cross key will become the floating EBL or floating VRM.

The position information on the mark displayed by the marker is displayed at the

lower right of the screen.

The marker information is displayed only until the point of reference and center

positions are determined.

(b) Use the cross key and push the ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ key.

The set marker position will be determined as the point of reference of #1EBL and

center of #1VRM.

Operating the EBL and VRM

Operating the EBL and VRMOperating the EBL and VRM

Operating the EBL and VRM

The method of operation is the same as for normal EBL and VRM.

• Only "setting the point of reference/ center position" is operable and if the EBL

key had been pushed, the operation is only with #1EBL while if the VRM key

had been pushed, the operation is only with #1VRM.

• The point of reference and center position may be moved only for #1VRM and

#1EBL. Prior to operation, be sure to select either #1EBL or #1VRM.

 Please refer to "3.3.11 Measuring the range to the target" - "1. Using VRM",

"3.3.13 Measuring the bearing of a target" - "1. Using EBL"

Canceling the point of reference or center position

Canceling the point of reference or center positionCanceling the point of reference or center position

Canceling the point of reference or center position

(a) Select "FIX" in the line "EBL1/VRM1" - the menu "FUNCTION".

The floating EBL will be canceled and the point of reference and center position

will be fixed to the location of the ship.

181

3.3.15 Using the parallel line cursor

The parallel line cursor function is set to #1EBL and #1VRM

The parallel line cursor function is set to #1EBL and #1VRMThe parallel line cursor function is set to #1EBL and #1VRM

The parallel line cursor function is set to #1EBL and #1VRM

(a)

Select "PLINE 1" or "PLINE 2" in the line "EBL1/VRM1" - the menu "FUNCTION".

When setting to PLINE 1, the parallel line cursor is displayed in half circumference.

When setting to PLINE 2, the parallel line cursor is displayed in a full circumference.

Operating the parallel line cursor

Operating the parallel line cursorOperating the parallel line cursor

Operating the parallel line cursor

(a) Push the ＥＢＬ

ＥＢＬＥＢＬ

ＥＢＬ key or the ＶＲＭ

ＶＲＭＶＲＭ

ＶＲＭ key.

Depending on the setting at the line "EBL1/EBL2" of the menu "FUNCTION", the

parallel line cursor will be displayed in a half circumference or full circumference.

However, it is necessary to set #1EBL or #1VRM to operational mode using the

cross key.

(b) Set the bearing and interval of the parallel line cursor by operating the cross key

in the up-down and left-right directions.

• When the upper portion of the cross key is pushed, the interval increases.

• When the lower portion of the cross key is pushed, the interval decreases.

• When the left side of the cross key is pushed, the parallel cursor turns in the

counterclockwise direction.

• When the right side of the cross key is pushed, the parallel cursor turns in the

clockwise direction.

Canceling the parallel line cursor

Canceling the parallel line cursorCanceling the parallel line cursor

Canceling the parallel line cursor

(a) Select "FIX" in the line "EBL1/VRM1" - the menu "FUNCTION".

The parallel line cursor display is canceled and use of normal #1EBL and #1VRM

will be enabled.

3.3.16 Switching the EBL and cursor bearing display among relative, true and

magnetic bearing display mode

There are three methods of displaying the bearing using EBL and the cursor.

• Relative bearing display:

This is the bearing of an EBL or cursor displayed with the bearing of the ship's

bow (ship's heading marker) taken as 0 degrees.

• True bearing display(Note):

This is the bearing of an EBL or cursor displayed with the bearing of true north

(north pole) taken as 0 degrees.

182

• Magnetic bearing display:

This is the bearing of an EBL or cursor displayed with the north indicated by a

magnetic compass taken as 0 degrees.

(Note): The term "true bearing" and the terms "gyro bearing" or "gyrocompass

bearing" used hereafter shall have the same meaning.

 In order to display the true bearing or magnetic bearing, it is necessary to input the

bearing information to the display.

Please refer to "3.6.1 Obtaining information on bearing" with respect to bearing in-

formation.

R: EBL relative bearing display

Relative azimuth angle of #1EBL

Relative azimuth angle of #2EBL

T: EBL true bearing display

True azimuth angle of #1EBL

True azimuth angle of #2EBL

M: EBL magnetic bearing display

Magnetic azimuth angle of #1EBL

Magnetic azimuth angle of #2EBL

183

Selection of bearing criteria (magnetic bearing, gyrocompass bearing)

Selection of bearing criteria (magnetic bearing, gyrocompass bearing)Selection of bearing criteria (magnetic bearing, gyrocompass bearing)

Selection of bearing criteria (magnetic bearing, gyrocompass bearing)

Select the bearing criteria as follows.

When the connected device a magnetic compass: MAG

When the connected device is a gyrocompass: TRUE

When GPS or LORAN is connected and the display mode does not become the true

bearing display mode even when (a) has been undertaken, switch to the other bearing

criterion.

(a) Select "MAG" or "TRUE" in the line "BEARING" - the menu "RADAR SET-UP 1".

(b) Push the ＭＥＮＵ

ＭＥＮＵＭＥＮＵ

ＭＥＮＵ key.

The menu setting has been completed.

Selection of the bearing criteria

Selection of the bearing criteriaSelection of the bearing criteria

Selection of the bearing criteria

(a) Select "REL" or "TRUE, MAG" in the line "EBL READOUT" - the menu "FUNC-

TION".

• When "REL" is selected, the bearing of the EBL when the ship's bow (ship's

heading marker) bears to 0 degrees is displayed.

• When "TRUE, MAG" is selected, the bearing of the EBL when the device se-

lected under "BEARING" above detects "north" is assumed to be 0 degrees is

displayed.

3.3.17 Changing the bearing display method of the PPI screen

The methods of display of the radar PPI screen consist of the following.

•

Relative bearing display (head-up display)

The ship's bow is displayed directly at the top of the PPI screen (bearing scale 0 degrees).

When the bearing of the ship's bow changes, the bearing of the echo image on the

PPI screen also changes.

When bearing information cannot be obtained from such navigation devices as

gyrocompass, display is by this relative bearing method.

The PPI image rotates counterclockwise

The ship rotates

in the starboard direction

184

• True bearing display (north-up display)

"North" is displayed as direct north of the PPI screen.

Even when the bearing of the ship's bow changes, the bearing of the PPI image

does not change.

(Gyrocompass or other device that provides bearing information is required.)

• Course-up display

The bearing of the ship's bow is always directly at the top of the PPI screen when

the ＢＲＩＬ／ＨＬ

ＢＲＩＬ／ＨＬＢＲＩＬ／ＨＬ

ＢＲＩＬ／ＨＬ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ key is continuously pushed (course setting).

Even when the bearing of the ship's bow changes, the bearing of the echo image

on the PPI screen does not change and the ship's heading marker rotates to the

extent of the change in the bearing of the ship's bow.

When the heading changes significantly, the course should be reset by pushing

the ＢＲＩＬ／ＨＬ

ＢＲＩＬ／ＨＬＢＲＩＬ／ＨＬ

ＢＲＩＬ／ＨＬ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ key continuously.

(Gyrocompass or other device that provides bearing information is required.)

The ship's heading marker

rotates clockwise.

The ship rotates

in the starboard direction

The ship's heading marker

rotates clockwise.

The ship rotates

in the starboard direction

BRIL

HL OFF

185

 In order to change the method of bearing display on the PPI screen, it is necessary

to input the bearing information from a navigation device.

Please refer to "3.6.1 Obtaining information on bearing" with respect to bearing

display.

Course setting in course

Course setting in courseCourse setting in course

Course setting in course-

-up mode

up modeup mode

up mode

(a) Continue to hold down the ＢＲＩＬ／ＨＬ

ＢＲＩＬ／ＨＬＢＲＩＬ／ＨＬ

ＢＲＩＬ／ＨＬ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

key.

The course will be set at the top of the PPI screen.

3.3.18 Simultaneously measuring the bearing, distance and travel time to the target

The cursor function is used for this measurement.

The cursor that is used here is indicated by a "+" mark on the PPI screen.

By using this function, in addition to the distance to the cursor, the bearing and travel

time to the cursor position may be obtained.

 In order to obtain the travel time, it is necessary to input the ship's speed information

from a navigation device.

Please refer to "3.6.2 Obtaining information on speed".

186

Displaying the cursor

Displaying the cursorDisplaying the cursor

Displaying the cursor

(a) Push the soft key ＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹ

(b) Push the soft key 4 and select ＣＵＲ

ＣＵＲＣＵＲ

ＣＵＲ

ＯＮ

ＯＮＯＮ

ＯＮ

Information will be shown as follows at the lower right of the screen.

• When information on speed is input, the maximum travel time displayed is

"9:59".

• The cursor will appear on the PPI screen and the cross key will enter cursor

mode.

Moving the cursor

Moving the cursorMoving the cursor

Moving the cursor

(a) Operating the cross key.

When cursor movement is abandoned, the bearing and distance to that point and

the required travel time to that point are displayed.

Erasing the cursor

Erasing the cursorErasing the cursor

Erasing the cursor

(a) Push the soft key ＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹ

(b) Push the soft key 4 and select ＣＵＲ

ＣＵＲＣＵＲ

ＣＵＲ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ .

The cursor, bearing, distance and required travel time will be erased.

The cross key is in cursor mode.

The cursor function is operating.

Azimuth angle from the bearing of the

ship's bow to the cursor.

Distance from the ship to the cursor.

Travel time when traveling from the

ship's position to the cursor position.

187

3.3.19 L/L display of the cursor

 In order to use this function, it is necessary to input the ship's position information

from a navigation device.

Please refer to "3.6.3 Obtaining information on position " with respect to informa-

tion on the ship's position.

 Select "TRUE" in the line "BEARING" - the menu "RADAR SET-UP 1".

 If the setting is "MAG" and information for converting magnetic bearing values into

gyro bearing values is input from a navigation device, L/L display will be under-

taken but when such conversion is not possible, such display will not be made as

errors will be generated in the L/L value.

3.3.20 Magnifying the echo images on the PPI screen

The following methods may be used to magnify the echo images that are shown on the

PPI screen.

• Use the image expansion function

• Set the transmission pulse width wider

• Use the zoom function

1. Using the image expansion func

1. Using the image expansion func1. Using the image expansion func

1. Using the image expansion function

tiontion

tion

The expansion function enlarges the echo images on the PPI screen in the angle direc-

tion and distance direction.

 When the image expansion function is used, two targets that are in close proximity

in the range direction (depth) and angle direction may be shown as one image on

the PPI screen.

(a) Push the soft key ＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹ

(b) Push soft key 1 and select ＥＸＰ

ＥＸＰＥＸＰ

ＥＸＰ

ＯＮ．

ＯＮ．ＯＮ．

ＯＮ． .

Attention

188

2. Changing the transmission pulse width

2. Changing the transmission pulse width2. Changing the transmission pulse width

2. Changing the transmission pulse width

With respect to ranges of 1.5 NM, 3 NM and 6 NM, the transmission pulse width may

be changed.

If a wider pulse width is selected, the echo images on the PPI screen will be extended in

the range direction. Conversely, when a narrower pulse width is selected, the image is

compressed (made shorter) in the range direction.

The difference of this function from the image expansion function is that when the

pulse width becomes wider, echoes that had not been visible are sometimes visible as

images.

 When switching to a wide pulse width, two targets that are in proximity in the range

direction (depth) may be shown as one echo on the PPI screen.

(a) Select "1.5NM", "3NM", or "6NM" in the line "TX PULSE" - the menu

"RADAR SET-UP 1".

Before magnified After magnified

Attention

189

3. Using the zoom function

3. Using the zoom function3. Using the zoom function

3. Using the zoom function

The zoom function allows any given area on the PPI screen to be enlarged by a factor of two.

The area to be enlarged is designated using the marker.

zThis function is disabled when the 0.125NM range is in use or TM is in use or the

floating EBL function is active.

Setting the zoom area

Setting the zoom areaSetting the zoom area

Setting the zoom area

(a) Select "SET" in the line "ZOOM" - the menu "FUNCTION".

The marker "+" will appear on the PPI screen.

(b) Position the marker in the desired location using the cross key.

zThe marker can be moved within up to 66% of the monitoring range.

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ key.

The area with the marker at the center will be enlarged by a factor of two.

After magnified (wider pulse width)

Before magnified (narrow pulse width)

190

Canceling the zoom

Canceling the zoomCanceling the zoom

Canceling the zoom

(a) Select "OFF" in the line "ZOOM" - the menu "FUNCTION".

The zoom function will be canceled.

3.3.21 Reducing unnecessary noise and emphasizing the target

 Do not use this function when observing radar beacon, SART signal or a target

that moves at high speed across the radar screen.

 This function is optimized in TM mode.

 When using this function in RM mode, please use N-UP or C-UP. If used with

H-UP, the image may blur.

Set the image processing

Set the image processingSet the image processing

Set the image processing

(a) Select "PR1" or "PR2" in the line "PROCESS" - the menu "FUNCTION".

• PR1: This is used when there is a target that is moving at low speed.

Images of relatively unstable targets are emphasized and displayed in a

stable manner.

This function has the effect of suppressing irregular signals such as sea

surface clutter.

However, images of targets that are moving at high speed will become weak.

As a rule of thumb, the function should be used at ranges of 1.5NM or less.

Location designated by the marker

Attention

191

x PR2: This function is used in stabilizing unstable images using PR1.

This function is effective when sea surface clutter is abundant.

As a rule of thumb, the function should be used at ranges of 3NM or more.

Canceling image processin

Canceling image processinCanceling image processin

Canceling image processing

(a) Select "OFF" in the line "PROCESS" - the menu "FUNCTION".

The image processing function has been canceled.

3.3.22 Moving the center of the PPI screen

By moving the center of the PPI screen (relocating the center), it is possible to extend

the range in any given direction.

z

This function is disabled when the zoom function is enabled or the maximum Range

is in use.

Setting the position to which the center is relocated.

Setting the position to which the center is relocated.Setting the position to which the center is relocated.

Setting the position to which the center is relocated.

(a) Push the soft key ＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹ

(b)

Push the soft key 2 and select first

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

ＣＥＮＴ

ＣＥＮＴＣＥＮＴ

ＣＥＮＴ

and then

ＣＥＮＴＥＲ

ＣＥＮＴＥＲＣＥＮＴＥＲ

ＣＥＮＴＥＲ

The marker will be displayed on PPI screen.

z

The marker may be moved up to within 66% of the monitoring range.

(d) Push the ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The center of the PPI screen will move to the designated location.

192

Canceling center relocation

Canceling center relocationCanceling center relocation

Canceling center relocation

(a) Push the soft key ＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹ

(b)

Push the soft key 2 and select first

ＣＥＮＴＥＲ

ＣＥＮＴＥＲＣＥＮＴＥＲ

ＣＥＮＴＥＲ

and then

Ｏ

ＯＯ

ＯＦＦ

ＦＦＦＦ

ＦＦ

ＣＥＮＴ

ＣＥＮＴＣＥＮＴ

ＣＥＮＴ

Center relocation has been canceled.

3.3.23 Controlling power consumption of the radar

In order to control power consumption, the timed transmission function is used.

By using the timed transmission function, the system repeatedly alternates between

transmission mode and standby mode.

Setting the transmission time

Setting the transmission timeSetting the transmission time

Setting the transmission time

(a) Select "10", "20", or "30" in the line "TX PERIOD" - the menu "DISPLAY".

The transmission time is designated by the rotation of the scanner unit.

Setting the standby time

Setting the standby timeSetting the standby time

Setting the standby time

(b) Select "3", "5", "10", or "15" in the line "STBY PERIOD" - the menu "DISPLAY".

The standby time is designated as 3 minutes, 5 minutes, 10 minutes or 15

minutes.

Commencing timed transmission

Commencing timed transmissionCommencing timed transmission

Commencing timed transmission

When this is undertaken, timed transmission begins.

193

(d) Push the

ＭＥＮＵ

ＭＥＮＵＭＥＮＵ

ＭＥＮＵ

key.

The menu setting has been completed.

1. After transmitting to the extent of the number of rotations of the scanner unit

designated, the system enters the standby mode for the period designated.

During standby mode, the echo from the radar disappears from the screen and

a timer that shows the remaining time to the next transmission is shown on

the display.

2. After completion of the standby period, the system again transmits to the ex-

tent of the designated number of rotations of the scanner unit.

3. This process is repeated.

CAUTION

While timed transmission is in progress, under no circumstances should the

scanner unit be approached.

While the scanner unit is stopped during the standby period, after completion

of such standby period, the scanner unit will resume rotation and may collide

with the body and cause injury.

Canceling timed transmission

Canceling timed transmissionCanceling timed transmission

Canceling timed transmission

(e) Select "OFF" in the line "TIMED TX" - the menu "DISPLAY".

The timed transmission has been canceled.

(f) Push the ＭＥＮＵ

ＭＥＮＵＭＥＮＵ

ＭＥＮＵ key.

The menu setting has been completed.

Canceling timed transmission while in standby mode

Canceling timed transmission while in standby modeCanceling timed transmission while in standby mode

Canceling timed transmission while in standby mode

(g) Push the ＳＴＢＹ

ＳＴＢＹＳＴＢＹ

ＳＴＢＹ key.

The timed transmission mode will be canceled and the system will return to

normal standby mode.

194

3.3.24 Locking a fixed target on the radar PPI screen while the ship is navigating

Normally, the PPI image moves as the ship moves.

This method of display is called:

Relative Motion : RM

In contrast to this, the display mode in which the echo images from fixed targets such

as land do not move and the location of the ship (center of the PPI) moves according to the

course and speed of the ship is called:

True Motion : TM

 In order to undertake TM display, it is necessary to input bearing information and the

ship's speed information from a navigation device.

Please refer to "3.6.1 Obtaining information on bearing" and "3.6.2 Obtaining in-

formation on speed" with respect to information on bearing and on speed.

Commencing True Motion display

Commencing True Motion displayCommencing True Motion display

Commencing True Motion display

(a) Select "TM" in the line "TM/RM" - the menu "FUNCTION".

The motion display on the PPI screen will change to "TM".

• The bearing display with TM is enabled is only N-UP.

True Motion Display mode: TM

FUNCTION

EBL1/EBL2

EBL2

VRM2

EBL READOUT

ZOOM

TM/RM

HDG MODE

PROCESS

FIX FLOAT

PLINE1 PLINE2

NO YES

REL TRUE,MAG

OFF SET

RM TM

H-UP N-UP C-UP

SELECT W/CROSS KEY' ( )

PRESS ENT TO SET

PRESS MUNU TO RETURN

OFF PR1 PR2

195

Canceling true motion display

Canceling true motion displayCanceling true motion display

Canceling true motion display

(a) Select "RM" in the line "TM/RM" - the menu "FUNCTION".

The TM is canceled and the mode is now N-UP of RM.

Relative Motion Display mode: RM

FUNCTION

EBL1/EBL2

EBL2

VRM2

EBL READOUT

ZOOM

TM/RM

HDG MODE

PROCESS

FIX FLOAT

PLINE1 PLINE2

NO YES

REL TRUE,MAG

OFF SET

RM TM

H-UP N-UP C-UP

SELECT W/CROSS KEY' ( )

PRESS ENT TO SET

PRESS MUNU TO RETURN

OFF PR1 PR2

196

• The following is an example of switching from relative motion display (RM) to

true motion display (TM)

The center of the PPI

moves to a location within

66% of the radius.

The center of the PPI

moves together with the

movement of the ship.

When the center of the PPI moves to a lo-

cation within 66% of the radius, the cente

of the PPI automatically resumes move-

ment to a location 66% of the radius in the

diagonal direction.

Select "TM"

Relative motion display

197

3.3.25 Monitoring the motion of other ships (Targets)

One of the following functions is used to monitor the movement of other ships (targets)

• Wakes (set using the soft key)

• Lookout alarm (set using the soft key)

1. Radar display of wake

1. Radar display of wake1. Radar display of wake

1. Radar display of wake

It is possible to confirm the movement of other ships through the length and direction

of the wake and this can be utilized to avoid collisions.

The length of a wake may automatically be selected among 15 seconds, 30 seconds, 1

minute, 3 minutes, 6 minutes, 15 minutes, 30 minutes and continuous.

Commencing radar display of a wake

Commencing radar display of a wakeCommencing radar display of a wake

Commencing radar display of a wake

(a) Push the soft key

ＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳ

(b) Push the soft key 4 and set the wake time to other than

ＷＫＳ

ＷＫＳＷＫＳ

ＷＫＳ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

Radar display of the wake will begin.

Ending radar display of a wake

Ending radar display of a wakeEnding radar display of a wake

Ending radar display of a wake

(a) Push the soft key

ＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳ

(b) Push the soft key 4 and set the wake time to

ＷＫＳ

ＷＫＳＷＫＳ

ＷＫＳ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

Display of the wake will be discontinued.

2. Using the lookout alarm

2. Using the lookout alarm2. Using the lookout alarm

2. Using the lookout alarm

The guard zone may be defined using the lookout alarm.

The guard zone refers to an "area" defined on the PPI screen.

When a target enters this "area" or exits the "area" an alarm is sounded.

The alarm mode that is activated when a target enters a guard zone is called the IN

mode.

The alarm mode that is activated when a target exits a guard zone is called the OUT

mode.

Setting the guard zone

Setting the guard zoneSetting the guard zone

Setting the guard zone

(a) Push the soft key ＧＵＡＲＤ

ＧＵＡＲＤＧＵＡＲＤ

ＧＵＡＲＤ

The marker "+" appears on the PPI screen and a dotted distance help line and

dotted azimuth help line that indicates the distance and azimuth of the marker will

be displayed.

(b) Push the soft key 1 ＭＡＫＥ

ＭＡＫＥＭＡＫＥ

ＭＡＫＥ

198

Move the marker to the initial point of reference of the zone to be designated.

(d) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The initial point of reference of the guard zone has been designated.

The dotted distance help line and dotted azimuth help line have been fixed.

(e) Move the marker using the cross key.

Move the marker to the distance range of the guard zone to be designated.

A new dotted distance help line will be displayed.

(f) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The distance of the guard zone has been set.

A ring around the distance range will be displayed as a continuous line.

(g) Move the marker using the cross key.

Move the marker to change the shape of the guard zone to any desired shape.

The form will change in the manner of a fan opening (or closing).

(h) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The extremity of the guard zone has been designated and the process has been

completed.

Guard zone in the process

of being designated.

199

Changing the alarm mode

Changing the alarm modeChanging the alarm mode

Changing the alarm mode

(a) Push the soft key

ＧＵＡＲＤ

ＧＵＡＲＤＧＵＡＲＤ

ＧＵＡＲＤ

(b) Push the soft key 4 to switch the wake time between

ＡＬＭ

ＡＬＭＡＬＭ

ＡＬＭ

ＩＮ

ＩＮＩＮ

ＩＮ

and

ＡＬＭ

ＡＬＭＡＬＭ

ＡＬＭ

ＯＵＴ

ＯＵＴＯＵＴ

ＯＵＴ

The selected alarm mode is activated.

Eradicating the guard zone

Eradicating the guard zoneEradicating the guard zone

Eradicating the guard zone

(a) Push the soft key

ＧＵＡＲＤ

ＧＵＡＲＤＧＵＡＲＤ

ＧＵＡＲＤ

(b) Push the soft key 2 to designate

ＡＬＭ

ＡＬＭＡＬＭ

ＡＬＭ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

The guard zone that had been produced will disappear from the PPI screen and

the lookout alarm function will be disabled.

Calling a guard zone

Calling a guard zoneCalling a guard zone

Calling a guard zone

(a) Push the soft key

ＧＵＡＲＤ

ＧＵＡＲＤＧＵＡＲＤ

ＧＵＡＲＤ

(b) Push the soft key 2 to designate

ＡＬＭ

ＡＬＭＡＬＭ

ＡＬＭ

ＯＮ

ＯＮＯＮ

ＯＮ

The guard zone previously produced will be displayed on the PPI screen and the

lookout alarm function will be enabled.

Changing the sensit

Changing the sensitChanging the sensit

Changing the sensitivity of the alarm

ivity of the alarmivity of the alarm

ivity of the alarm

(a) Push the soft key

ＧＵＡＲＤ

ＧＵＡＲＤＧＵＡＲＤ

ＧＵＡＲＤ

(b) Push the soft key 3 repeatedly to select the alarm sensitivity.

Alarm sensitivity "1" through "7" indicates the level of the image (strength of the

echo) at which the alarm is sounded.

ＳＥＮＳ

ＳＥＮＳＳＥＮＳ

ＳＥＮＳ

１

１１

１

most readily causes the alarm to sound while

ＳＥＮＳ

ＳＥＮＳＳＥＮＳ

ＳＥＮＳ

７

７７

７

least sensitive.

 The alarm may sound as a result of noise.

200

3.4 Other Convenient Functions

3.4.1 Displaying the ship's speed on the display unit

When speed information is input to the display unit, the ship's speed is automatically

displayed.

 In order to use this function, it is necessary to input ship’s speed information from a

navigation device.

Please refer to "3.6.2 Obtaining information on speed".

3.4.2 Displaying the ship's heading on the display unit

When ship’s heading information is input to the display unit, the ship's heading is

automatically displayed.

 In order to use this function, it is necessary to input ship’s bearing information from a

navigation device.

Please refer to "3.6.1 Obtaining information on bearing".

This radar equipment is capable of inputting bearing information from the following

two input connectors at the back of the display unit.

• CMPS+ and CMPS- terminals of the EXT1(J3) connector

• NAVRX and NAVCOM terminals of the GPS(J4) connector.

Ｍ

ＭＭ

Ｍ： Bearing information input from CMPS+ and CMPS- terminals of

the EXT1(J3) connector

Ｌ

ＬＬ

Ｌ： Bearing information input from NAVRX and NAVCOM terminals of

the GPS(J4) connector

Ship's speed

Input terminal display

201

The order of priority in utilizing bearing information is as follows.

Ｍ

ＭＭ

ＭＬ

ＬＬ

Ｌ

CMPS+, CMPS- terminals ＞ NAVRX, NAVCOM terminals

(priority: high) (priority: low)

3.4.3 Displaying position information (latitude/longitude, LORAN C time difference) of

the ship and waypoint information (latitude/longitude)

Display of position in

Display of position inDisplay of position in

Display of position information

formationformation

formation

(a) Select among "L/L", "TD", "CUR L/L", or "WPT L/L" in the line "POSITION"

- the menu "DISPLAY".

When displaying latitude/longitude : "L/L"

When displaying LORAN C time difference : "TD"

When displaying L/L of the cursor : "CUR L/L"

When displaying the latitude and longitude of the waypoint

: "WPT L/L"

Erasing location information

Erasing location informationErasing location information

Erasing location information

(b) Select "NO" in the line "POSITION" - the menu "DISPLAY".

The location information is erased.

 When "L/L" is selected, it is necessary to input the ship's position (latitude and lon-

gitude) information from a navigation device.

 When "TD" is selected, it is necessary to input the ship's position (LORAN C time

difference) information is a navigation device.

 When "CUR L/L" is selected, it is necessary to input the ship's position (latitude and

longitude) information from a navigation device.

 When WPT "L/L" is selected, it is necessary to input the waypoint’s position (latitude

and longitude) information from a navigation device.

Please refer to "3.6.3 Obtaining information on position" for details.

202

3.4.4 Displaying the waypoint

 In order to use this function, it is necessary to input of the following information to

the display unit:

Information on the bearing of the waypoint

Information on the distance to the waypoint

Information on the ship's speed.

Please refer to:

"3.6.1 Obtaining information on bearing"

"3.6.2 Obtaining information on speed"

"3.6.4 Obtaining information on the distance to the waypoint"

Display of the waypoint

Display of the waypointDisplay of the waypoint

Display of the waypoint

(a) Select "ON" in the line "WAYPOINT" - the menu "DISPLAY".

• The bearing, distance and required travel time (when ship speed information

has been input) will be displayed.

• The route from the ship to the waypoint will be displayed with the following

marker.

Circle : Position of the waypoint

Refer to "2.2 Explanation of Screen Readout"

Erasing the waypoint

Erasing the waypointErasing the waypoint

Erasing the waypoint

(a) Select "OFF" in the line "WAYPOINT" - the menu "DISPLAY".

The waypoint mark, the bearing, distance and required travel time to the

waypoint will disappear.

203

3.5 Miscellaneous Considerations

3.5.1 Replacing the battery (BT1)

In order to maintain the information that has been set, the battery (BT1) needs to be

replaced at regular intervals.

(a) Replacing the battery (BT1) [Type: CR2032-FT6-1, SANYO Electric Co, Ltd.]

• Please call the dealer servicing your locality for a replacement battery.

(b) Reinitializing

• The lithium battery maintains the content of the setting of the menu and soft

key even when the power is shut off allowing use under the conditions of the

last use.

• If this battery runs down, all conditions including the menu will automatically

be reset.

For this reason, initializing is required after replacement of the battery.

 When the battery wears down, distance and bearing may become inaccurate.

In such cases, the battery should immediately be replaced and initialization un-

dertaken.

• In the event immediate replacement of the battery is not feasible, initializa-

tion should be undertaken each time the power is turned on as an emergency

measure. However, each time the power is shut off, the content that has

been set is reset.

 Please refer to "9.8 Initial Setting" with respect to details on initialization.

Attention

204

3.5.2 In cases of abnormality during operations

In the event such phenomena as the screen becoming disturbed or the machine not

accepting switch input occurs during use of the radar, initialize using the procedures

outlined below.

 When initialization is undertaken, all setting excluding the menu “INITIAL SET-

TING 1” and “INITIAL SETTING 2” will be reset and the ex-factory shipment con-

ditions.

(a) Push the ＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦ key and Ｘ－ＭＩＴ／ＯＦＦ

Ｘ－ＭＩＴ／ＯＦＦＸ－ＭＩＴ／ＯＦＦ

Ｘ－ＭＩＴ／ＯＦＦ key simulta-

neously.

Power is turned off.

(b) Push the ＭＥＮＵ

ＭＥＮＵＭＥＮＵ

ＭＥＮＵ key, ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ key and ＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦ key

simultaneously.

Power will be turned on as in normal operation for turning on power.

Attention

205

3.6 External Navigation Devices

 Please refer to "9.3.4 Display unit rear panel" on connections.

This radar equipment has the following busses at the rear of the display unit.

・NMEA

An external navigation device with either of these busses may be connected for input

and output of information.

3.6.1 Obtaining information on bearing

In order to obtain information on the bearing of the ship, one of the following needs to

be connected to the display unit.

• Magnet compass

• GPS gyro

Bearing information is input from either the CMPS or NAVRX terminals.

3.6.2 Obtaining information on speed

In order to obtain information on the speed of the ship, one of the following devices

need to be connected to the display unit.

• GPS

• LORAN C

Speed information is input from either the CMPS or NAVRX terminals.

3.6.3 Obtaining information on position

In order to obtain information on the ship's position in terms of latitude and longitude,

one of the following devices need to be connected to the display unit.

• GPS

• LORAN C

In order to obtain the ship's position information using LORAN C time difference, the

following needs to be connected to the display unit.

• LORAN C

CMPS+ and CMPS- terminals of the EXT1(J3) connector

NAVRX and NAVCOM terminals of the GPS(J4) connector

206

In order to obtain information on the L/L of the waypoint, one of the following devices

need to be connected to the display and the waypoint set in such device.

• GPS

• LORAN C

Information on position is input from either the CMPS or NAVRX terminals.

3.6.4 Obtaining information on distance to the waypoint

In order to obtain information on distance to the waypoint, one of the following devices

need to be connected to the display unit, and it is necessary that the waypoint set in the

navigation device is displayed on screen.

• GPS

• LORAN C

Information on distance is input from either the CMPS or NAVRX terminals.

207

4 How to Interpret the PPI Screen

4.1 Height of and the Distance to the Target

The maximum distance to a target that can be observed with a radar depends not only on

the power of the radar's transmitter, beam width of the scanner unit, and the receiver's

sensitivity but also on height of a target, distance to a target and height of scanner unit line

etc. This is because the radio wave emitted by a radar runs straight, undergoing no

influence by the curvature of the earth surface.

[Distance and Target]

For example, when the scanner unit lies 3 meters above the sea level, the radar can

detect and display an island with a height of 10 meters at a distance 10 NM away from

the scanner unit position but cannot detect and display an island with a height of 5

meters at the same distance. This is theoretically true but does not always hold,

depending on weather conditions.

For a target located 10 NM away to be displayed on a radar, it theoretically needs to be

7.6 meters or higher. Any targets lower than 7.6 meters cannot be displayed on a radar.



The target may be unable to be observed when the height of a scanner unit or an target is low

a1=2.23√h1

a2=2.23√h2

a1 + a2=2.23 (√h1 + √h2 )

a1, a2：Unit [Nautical miles]

h1, h2：Unit [Meters]

Island not displayed on the screen

10 NM

a1+a2(NM)

Distance

h2(meters)

Target height

h1(meters)

Scanner unit height

10 NM

208

4.2 Returns from a Target

The intensity of returns from a target is related not only to the size of the target but

also to the materials and shape of the components making up the target. Accordingly,

larger objects do not necessarily develop strong returns.

On coastlines, in particular, the intensity of returns is dependent on their

physiographic features. For a coastline with a fairly gradual ascent, only inland

mountains areas may be displayed as echoes. This fact needs to be kept in mind when

measuring the distance to a coastline.

 Since the echo which returns from a coastline with a fairly gradual ascent is weak,

observation of such land may not be able to be performed.

4.3 Propagation Path of Radio Waves

 Radio waves may be shielded if there is a large intercepting obstacle (e.g.,

mountains, rain, snow, etc.) in their propagation path and any targets behind the

obstacle cannot be observed.

n island that is not displayed because of heav

rain in between the own ship and the island

ship that is not displayed because of an island

in between the own ship and the target ship

209

4.3.1 Sea returns

On a wavy sea surface, an echo appears on the PPI screen as a bright defused image at the

center of the screen. This echo is developed by returns from the sea surface. The features of

the echo depend on the size and range of the wave, and the wind direction.

4.3.2 False echoes

There are cases in which nonexistent targets appear as echoes or in which existing targets

do not appear as echoes on the PPI screen. These echoes are called false echoes.

False echoes are produced by the factors explained below.

 Please observe carefully in consideration of there being always false echoes.

(a) Ghost

Depending on the location where the scanner unit is installed, radio waves are emitted from nearby

chimney stacks or masts, developing ghosts. Consequently, targets that are located in those direction

may not appear as echoes on the PPI screen.

The presence of these ghosts can be identified by observing sea returns and checking the returns for

dim areas or voids.

If a ghost is detected, remember the direction in which it appears and observe the target carefully.

(b) Side echo

There are cases in which an arc-shaped broken line appears over

the same range as the echo from the target. This image is caused by

the side lobes of the beam emitted from the scanner unit. This type

of false echoes can easily be identified if the target stands alone.

The direction of the radio wave

from the radar may be changed by a

reflection (secondary reflection) at a

chimney stack or mast of a ship,

developing a false echo in a direction

in which there should be no target.

The indirect echo developed by the

secondary reflection appears in the

direction of the chimney stack or

mast that reflected the radio wave.

210

(d) Multiple echo

Multiple echoes are developed by multiple reflections caused by a building or large vessels

that has large vertical surfaces. These echoes are spaced at an equal interval, with the one

that is closest to the own ship being the true echo.

(e) Radar interference

If there is a radar that uses the same frequency as that of the own ship near the own ship,

interferences caused by that radar appear on the PPI screen. These interferences appear as

clusters of spots of varying patterns. Since they do not occur at the same location with time,

they can easily be distinguished from true echoes.

Radar interferences can be reduced or eliminated by choosing "ON" from

"FUNCTION"-"IR".

【Examples of radar interferences】

211

4.4 Display of Radar Transponder

SART (Search and Rescue Radar Transponder) is life preserving device approved by

GMDSS which is used for locating survivors in the event of a disaster or distress. SART

operates in the 9GHz frequency band. When it receives a radar signal (interrogating

radio wave) of 9GHz transmitted by a rescue ship or aircraft radar, SART transmits a

series of respouse signals to the searchers to indicate the distress position.

In order to see the SART or radar beacon mark on the radar screen.

① RANGE SCALE ： Select 6 or 12 nm

② SEA CLUTTER control ： Set to minimum

③

AUTO SEA

： OFF

④ TUNE control ： DETUNED to reduce the clutter

⑤ IR ： Set IR OFF

⑥ PROCESS ： Set PROCESS OFF

【Example】

 When above settings ①to ⑥ are made to display SART signals, objects around

the own ship will not appear on the radar screen, so perform thorough visual

monitoring of the sea area around the own ship to avoid any collision or stranding.

Further, when more than one radar systems are mounted, while using a 9GHz

band radar for searching SART signals, be sure to use another radar as an

ordinary radar to perform monitoring of objects around the own ship to avoid any

collision, check of the position of the own ship to avoid any stranding, and so on.

Need to return the set for normal operation on completion.

Attention

212

5 Maintenance and Inspection

5.1 General Maintenance

WARNING

The customer should refrain from inspecting or repairing the internal parts of this

equipment.

Inspection or repair other than by specialized service personnel may result in

fire or severe electric shock.

Please contact the sales department of Japan Radio Co., Ltd. or your local

branch, outlet or sales office with respect to maintenance and repair.

When performing maintenance in increment weather, please be sure to shut

the main power off. Maintenance work performed without shutting the main

power off may result in severe electric shock.

CAUTION

When cleaning the surface, please refrain from using organic solvents such as

thinner or benzene.

Use of such organic solvents may damage the surface coating.

When cleaning the surface, remove dust and grime and wipe with a clean dry

cloth.

The following maintenance steps are required to ensure that the radar always operates in

the optimal condition. Since breakdowns will be reduced through maintenance, periodic

maintenance is recommended.

General maintenance steps common to all equipment are as follows.

Cleaning

Remove dust, grime and sea water that has adhered to the unit. Use dry cloth to clean

the unit. In particular, use a brush to clean the ventilating opening to ensure smooth flow

of air.

213

5.2 Scanner Unit

WARNING

When performing maintenance or inspection of the scanner unit, be sure to shut

off the main power source. Sudden movement of the scanner may cause

collision and injury to the human body.

Be sure to shut off the main power source when approaching the scanner unit for

the purposes of maintenance or inspection. Exposure to electric waves at

proximate distances may negatively affect the human body.

(1) Radiation unit

If the front of the radiation unit is soiled with soot, salt, paint specks, bird excrement or

other alien matter, electric waves may become attenuated and reflection may occur thus

causing degradation in the performance of the radar.

The radiation unit should be inspected and always kept clean by wiping with cloth

soaked in alcohol or water in the event of soiling.

Solvents such as gasoline, benzene, trichlene or ketone should never be used for this

purpose.

(2) Pedestal

The pedestal and attachment bolts of the scanner unit should be inspected periodically

for erosion and maintained to ensure safety. Painting is the best measure for preventing

erosion and it is recommended that this be undertaken once in half a year.

5.3 Display Unit

Cleaning the cathode-ray tube

When dust adheres to the cathode-ray tube, transparency degrades and the images

become dark.

Cleaning is performed using cloth soaked in water (flannel or cotton). Wiping

vigorously with dry cloth or the use of gasoline or thinner should be avoided.

CAUTION

Vigorous wiping with dry cloth or the use of gasoline or thinner should be

avoided in cleaning the cathode-ray tube.

Such action may cause scratches and deterioration.

214

5.4 Special Parts

JMA-2343

Model

Number

Name Type

Manufacturer

Location of use JRC Code

V201 Magnetron MSF1421B New JRC Scanner unit 5VMAA00049

A101 Circulator H-6AJRD00001 Toshiba Scanner unit 6AJRD00001

A102 Diode limiter NJS6930 New JRC Scanner unit 5EZAA00024

E301 Front end NJT1028 New JRC Scanner unit 5EZAA00039

JMA-2344

Model

Number

Name Type

Manufacturer

Location of use JRC Code

V201 Magnetron MSF1422B New JRC Scanner unit 5VMAA00051

A101 Circulator H-6AJRD00001 Toshiba Scanner unit 6AJRD00001

A102 Diode limiter NJS6930 New JRC Scanner unit 5EZAA00024

E301 Front end NJT1969 New JRC Scanner unit 5EZAA00037

5.5 Circuit Blocks for Repair

NKE-249

Name Unit/ type of circuit Remarks

Modulator circuit CME-307

Receiver NRG-140

NKE-250

Name Unit/ type of circuit Remarks

Modulator circuit CME-308

Receiver NRG-141

Motor unit CBP-153 With rotating pulse generation circuit

Motor brush BRXP05247 Containing 2

215

NCD-4170

Name Type Remarks

Main control circuit CMC-1156

Power supply circuit CBD-1596

Main panel circuit CCK-873

Soft key panel circuit CCK—872

Interior of the monitor unit CKJ-159 CRT + deflecting coil

CRT monitor control unit CCN-366 With socket circuit

216

5.6 Actions to Deal with Abnormalities and Breakdown

In the case of semiconductor circuits, except in cases of problems in the design or inspection of

such circuits or causes that are external or caused by humans, breakdown or deterioration of the

circuit does not often occur. In general, the causes of breakdown that are relatively frequently

found are wire cut in the high resistance device due to high humidity, defect in the variable

resistance and defective contact of switches and relays.

Moreover, in many cases the cause for breakdown is not a defect in parts but rather poor

adjustment (particularly inadequate tuning adjustment) or poor maintenance (particularly defect in

cable contact) and inspecting or readjusting these aspects is often effective in the case of

perceived abnormality or breakdown. The following table should be taken into consideration in

the case of abnormalities or breakdown.

There is always a cause for blown fuse and after replacing the fuse, it is necessary to

investigate the related circuits even when no abnormality remains. However, consideration

should be given to the fact that there is significant variance in the characteristics of fuse. Please

refer to the list on the fuses used given in Section 9.4.

No. Condition of the Breakdown Conceivable Cause

1 Nothing appears on the

CRT.

a. Breakdown in the power supply unit (CBD-1596)

b. Fuse F1 has blown

c. Breakdown of the monitor

d. Breakdown of the main control circuit (CMC-1156)

e. The electric power of the ship is inadequate.

2 The scanner unit does not

rotate.

a. Fuse F2 has blown

b. Breakdown in the motor unit (JMA-2343: CML-645

H-7BDRD0023 inside the scanner unit, JMA-2344:

CBP-153)

c. Breakdown of the safety switch of the scanner unit

(JMA-2344 only)

3 The scanner unit rotates but

no radar image appears

(characters and markers

are, however, displayed).

a. Breakdown of the receiver (JMA-2343: CAE-457,

JMA2344: CAE-457-1)

b. Breakdown of the main control circuit (CMC-1156).

What is the condition of the transmission trigger (TI)?

c. Breakdown of the motor unit (JMA-2343: CML-645

H-7BDRD0023 inside the scanner unit, JMA-2344:

CBP-153)

4 The operation switches do

not work.

a. If the switches do not work even after turning the power on

again, breakdown in the main control circuit (CMC-1156).

b. Breakdown in the main operation panel circuit

(CCK-873) or soft key panel circuit (CCK-872)

c. Cut in the cable connecting the operation unit.

217

No. Condition of the Breakdown Conceivable Cause

5 Only noise is displayed and

no radar image is displayed

(characters and markers

are, however, displayed).

a. Modulator (JMA-2343: CME-307, JMA2344: CME-308)

b. Defective magnetron

c. Breakdown in the main control circuit (CMC-1156)

d. Defective tuning voltage

6 While radar images are

displayed, the characters

and markers are not

displayed.

a. Breakdown in the main control circuit (CMC-1156).

7 Reception is poor. a. Deterioration or fault in the magnetron

b. Breakdown in the modulator (JMA-2343: CME-307,

JMA-2344: CME-308). Defect in the pulse width

switching?

c. Breakdown in the receiver (JMA-2343: CAE-457,

JMA-2344: CAE-457-1)

d. Water damage to the radiation unit or cables between

equipment (soiling of the radiation unit, adherence of

ice or snow, internal erosion of the cable between

equipment)

e. Defective tuning voltage

f. Interruption in the pulse switching signal (PW)

8 The image is warped or

drifts.

a. Breakdown or defective adjustment of the monitor

b. Interruption in the synchronizing signal for horizontal

signal (HS) and vertical signal (VS)

c. Breakdown in the CRT monitor circuit (CNN-366)

9 Nothing happens on the

screen when the fixed

distance marker, variable

distance marker, electronic

cursor or panel lighting

switches are pushed.

a. The brightness adjustment is at the minimum level.

b. Breakdown in the main control circuit (CMC-1156)

10 The screen returns to the

initial state during operation.

a. The electric power of the ship is inadequate.

b. Breakdown in the main control circuit (CMC-1156)

c. Breakdown in the power supply unit

11 The alarm does not activate. a. Breakdown in the main control circuit (CMC-1156)

12 The radar wake does not

operate.

a. Breakdown in the main control circuit

b. The image brightness is too low.

13 The display does not

change to true bearing

(north-up) or course up.

a. There is no data being received from the bearing

sensor (NMEA).

218

6 After-sales Service

★

★★

★ When asking for repair

When a system failure is suspended, read Chapter 4, 5 and 9 carefully and re-check the

abnormal part.

If it is still considered to be a failure, stop the operation at once and consult with the

dealer you purchased the product, our sales department or your nearest branch or

business office.

●

●●

● Repair within the warranty period

If the failure occurred under proper operation in accordance with the instruction

manual, the dealer or JRC shall repair the product without charging. In case of any

other failure occurred due to mis-operation or natural disaster, the repair work will be

charged.

●

●●

● Repair after the warranty period has expired

If the product is recoverable by repairing, we will repair it upon your request.

●

●●

● Items to be identified

☆ Product name, model name, manufacturing date and serial number

☆ Failure condition (as detailed as possible: see the Radar Failure Checklist on Page

219.)

☆ Your company/organization name, location and telephone number

★

★★

★ Recommendation of maintenance inspection

Although it depends on your operating condition, the performance of the product may

be lowered due to parts wear.

We recommend maintenance inspection, apart from the normal maintenance work.

For maintenance inspection, consult with the dealer you purchased the product, our

sales department, or your nearest branch or business office.

Note that this maintenance inspection will be charged.

For detail of after-sale service, contact the dealer you purchased the product, our sales

department, or your nearest branch or business office.

☞Contact : See the list at the end of the manual.

219

RADAR FAILURE CHECKLIST

When ordering for repair, check the following items, fill in the sheet and send it to us.

If there is any uncertain items, contact your ship and give us correct information on the

product.

Ship name： Phone： Fax：

Radar general model name：JMA― Serial No.：

(Write the full model name correctly)

(1) Check the following items in the order of the number, and circle the applicable answer

between YES or NO.

If the item cannot be determined as YES or NO, explain in detail in the item (15), Others.

(2) If any of the items (1) through (4) is marked as NO, check the fuse of the product (refer

to Section 5.6 and 9.4).

(3) Check the items (4) through (14) while the transmission (TX) is ON.

* Functions mentioned in the items (13) through (14) may be optional. If the function is optional, answer is not necessary.

No. Check Item Result

(1) Power can be turned on. (The lamp on the operation panel is lit.) YES NO

(2)

A few minutes after powering-on, it will become stand-by status (TX Ready). YES NO

(3)

When powering-on (or TX ON), the CRT displays something (CRT is lit). YES NO

(4) The scanner unit rotates at the transmission (X-MIT) ON. (Check the

following items while transmission is ON.) YES NO

(5) Tuning is enabled. (Check with the range of 6NM or more.) YES NO

(6) Fixed marker is displayed. YES NO

(7) VRM is displayed. YES NO

(8) White noise is displayed while set at SEA, RAIN minimum, GAIN

maximum, IR-OFF and maximum range. YES NO

(9) Target reflection echo is displayed. YES NO

(10) Sensitivity of reflection echo is normal. YES NO

(11) EBL is displayed. YES NO

(12) Cursor mark moves. YES NO

*(13) GYRO course can be set and normally displayed. YES NO

*(14) LOG speed can be normally displayed. YES NO

(15) Others (Error message, etc)

220

7 Disposal

7.1 Equipment Disposal

Dispose of this equipment by following the ordinances or regulations of the local authorities

in charge of the disposal site.

7.2 Disposal of Used Batteries

WARNING

Before disposing of used lithium batteries, insulate by affixing tape to the

positive and negative terminals or by other means. Otherwise, short-circuiting

may occur, resulting in heat generation, bursting or ignition.

On this equipment, lithium batteries are used for:

BT1 in the CPU control circuit (CMC-1156) (Sanyo electric CR2032-FT6-1).

● Do not keep used lithium batteries but dispose of them immediately after as

non-combustible waste.

● Before disposing of used lithium batteries, insulate by affixing tape to the positive and

negative terminals or by other means. In the area where used batteries are separated

from other waste, dispose of them by following the local regulations.

7.3 Disposal of Used Magnetron

The scanner unit in this radar use a magnetron.

● After replacing it, return the used one to your local distributor or our sales office.

For detail, ask your local distributor or our sales office.

221

8 Specifications

8.1 General

(1) Scanning mode Raster scanning, PPI

(2) Display unit 10-inch square monochrome CRT

(3) Display color Green

(4) Ranges

JMA-2343

0.125, 0.25, 0.5, 0.75, 1.5, 3, 6, 12, 24, 36, 48 NM

JMA-2344

0.125, 0.25, 0.5, 0.75, 1.5, 3, 6, 12, 24, 36, 48, 64 NM

(5) Range resolution 25m maximum

(6) Minimum range 25m maximum

(7) Bearing accuracy ±1°maximum

(8) Bearing discrimination

JMA-2343 4.2˚

JMA-2344 2.2˚

(9) Bearing measurement mode True/Relative bearing

(10) Environmental condition

・ Temperature Scanner unit －15˚C to ＋55˚C

Display unit －15˚C to ＋50˚C

・ Relative humidity 93% maximum at 40˚C

・ Relative wind velocity

Scanner unit 36.0m/sec (70 knots)

(11) Power consumption

・ DC input (12,24,32V)

JMA-2343 Approx. 60W

JMA-2344 Approx. 65W

・ AC input (Note) Approx. 100VA

(100/110/115/200/220/230V, 50/60Hz single phase)

(12) Input power range DC10.8V to DC42V

(13) Preheating time Approx. 90 seconds

(14) Warm-up time Approx. 3 seconds maximum

(Note) The following rectifiers need be used when AC input is to be used : NBA-797A

222

8.2 Scanner Unit (NKE-249/250)

(1) Dimensions

NKE-249

・ Diameter 620mm

・ Height 275mm

NKE-250

・ Swing circle 1220mm

・ Height 432mm

(2) Mass

NKE-249 Approx. 10.5kg

NKE-250 Approx. 24kg

(3) Polarization Horizontal

(4) Directivity characteristics

NKE-249

・ Horizontal beam width 4˚

・ Vertical beam width 25˚

・

Side lobe level

－21dB maximum (less than ±10

from main lobe)

NKE-250

・ Horizontal beam width 2˚

・ Vertical beam width 30˚

・

Side lobe level

－23dB maximum (less than ±10

from main lobe)

－26dB maximum (other than ±10

from main lobe)

(5) Rotation

NKE-249/250 Approx. 27 rpm

(6) Transmitter frequency 9410±30MHz

(7) Peak power

NKE-249 4kw

NKE-250 6kw

(8) Transmitter tube

NKE-249 Magnetron : MSF1421B

NKE-250 Magnetron : MSF1422B

(9) Pulse length/PRF

NKE-249 0.08μs /2250Hz (0.125, 0.25, 0.5, 0.75, 1.5NM)

0.25μs/1700Hz (1.5, 3 NM)

0.5μs/1200Hz (3, 6 NM)

1.0μs/650Hz (6, 12, 24, 36, 48 NM)

223

NKE-250 0.08μs/2250Hz (0.125, 0.25, 0.5, 0.75, 1.5 NM)

0.25μs/1700Hz (1.5, 3 NM)

0.5μs/1200Hz (3, 6 NM)

1.0μs/650Hz (6, 12, 24, 36, 48, 64 NM)

(10) Modulator Solid state modulator driver

(11) Duplexer Circulator and diode limiter

(12) Mixer MIC front-end

(13) IF amplifier

・ Intermediate frequency 60MHz

・ Band width 20/6/3MHz

・ Characteristic Semi-log characteristic

(14) Noise figure 6dB maximum

224

8.3 Display Unit (NCD-4170)

(1) Dimensions

・ Width 278mm

・ Height 242mm

・ Depth 275mm

(2) Mounting Table-top mounting

(3) Mass Approx. 9kg

(4) Cathode-ray tube 10-inch square monochrome CRT

(5) Range scales

Range (NM) Range ring interval (NM) Number of rings (NM)

0.125 0.0625 2

0.25 0.125 2

0.5 0.25 2

0.75 0.5 3

1.5 0.25 6

3 0.5 6

6 1 6

12 2 6

24 4 6

36 6 6

48 8 6

Only JMA-2344 64 16 4

(6)

Range ring accuracy

±0.9% of selected range or ±8m, which is greater.

(7) VRM VRM1/VRM2

JMA-2343 0 to 48 NM, digital numeric display of 3 figures

JMA-2344 0 to 64 NM, digital numeric display of 3 figures

(8) EBL EBL1/EBL2

0˚ to 359˚, digital numeric display of 3 figures

(9) Tuning mode Manual or automatic

(10) Bearing scale 360˚ scale graduated at intervals of 1°

(11) Ship’s heading marker Electronic

(12) Sea surface clutter suppression Manual or automatic

(13)

Rain and snow clutter suppression

Manual or automatic

(14) Radar wakes display 15 sec/30 sec/1 min/3 min/6 min/15 min/30 min/

continuous

(15) Center move 66% maximum of PPI’s radius

225

(16) Keys/Controls

・Main panel STBY/OFF key

X-MIT/OFF key

[TUNE] control

[GAIN] control

[SEA] control

[RAIN] control

RANGE key

VRM key

EBL key

BRIL/HL OFF key

MENU key

ENTER key

Cross key

・Software key panel Software key : 4

(17) Software key function ・DISPLAY Screen expansion [EXP]

Center move [CENTER]

Fixed range rings [RR]

Cursor [CUR]

・PROCESS Clutter suppression

[AUTOOFF/A-SEA/A-RAIN]

Interference rejection [IR]

Tune mode [TUNE]

Radar wakes [WKS]

・GUARD Zone make [MAKE]

Alarm setting [ALM]

Sensitivity [SENS]

Alarm mode [ALM]

OFF

OFFOFF

OFF

STBY

STBYSTBY

STBY

OFF

OFFOFF

OFF

X-

-MIT

MITMIT

MIT

▲

▲▲

▲

RANGE

RANGE RANGE

RANGE

▼

▼▼

▼

VRM

VRMVRM

VRM

EBL

EBLEBL

EBL

MENUMENU

ENTER

ENTERENTER

ENTER

HL OFF

HL OFFHL OFF

HL OFF

BRIL

BRILBRIL

BRIL

226

(18) Menu

・FUNCTION EBL1/VRM1 mode setting [EBL1/VRM1]

(Fix [FIX]/Float [FLOAT]/Parallel line [PLINE])

EBL2 setting [EBL2]

VRM2 setting [VRM2]

EBL read out [EBL READOUT]

Zooming of echo image on PPI [ZOOM]

True motion/Relative motion [TM*/RM]

Heading mode [HDG MODE]

(Head-up [H-UP]/North-up [N-UP]*/

Course-up [C-UP]*)

Image process [PROCESS]

・DISPLAY Position display [POSITION]

(Own ship [L/L or TD]/Cursor [CUR L/L]/

Waypoint [WPT L/L])*

Waypoint display [WAYPOINT]

Range unit [RANGE]

(NM/KY/KM)

Timed transmission [TIMED TX]

(Transmission period [TX PERIOD]/

Stand-by period [STBY PERIOD])

・RADAR SET-UP 1 Buzzer volume [BUZZER]

Panel dimness [DIMMER]

Transmitter pulse width [TX PLSE]

(1.5NM/3NM/6NM)

Bearing reference [BEARING]

(Magnetic bearing [MAG]/True bearing [TRUE])*

Multi display unit setting [MULTI DISPLAY]

・RADAR SET-UP 2 Language

(English/Japanese/Chinese/Francais/ Espanol/

Italiano/Norsk/Deutsch/Korea)

227

(19) Input from external device GPS (NMEA0183)

Electric compass or GPS compass (NMEA0183)

NMEA0183 version : v1.5, v2.1, v2.3

Latitude/Longitude : GGA, RMA, RMC, GLL

Waypoint : RMB, BWC

Speed : VTG, RMA, RMC, VHW

Course : VTG, RMA, RMC

Ship’s head : HDT, VHW, HDM, HDG

VARIATION : HDG, RMA, RMC

TD (LoranC time difference) : GLC

GTD

RMA

(20) Output to external device Cursor data (Bearing/Range)

NMEA0183 RSD sentence**

Sub monitor

(Vertical/Horizontal synchronous signal,

video signal)

* You need a connection with navigation device or bearing sensor.

** Data output only when pushing ENTER key.

228

8.4 Rectifier Unit (NBA-797A)

(1) Dimensions

・Width 270mm

・Height 430mm

・Depth 175mm

(2) Mounting Wall type, drip proof structure

(3) Mass Approx. 18kg

(4) Input power AC 100/110/115/200/220/230V±15%

50/60Hz, Single phase

(5) Power consumption 200VA

(6) Output DC 26V, 7A

8.5 Unit-to-unit Spacing

Maximum Cable Length Standard Cable Length

Scanner to display 20m 15m

Display to rectifier (Note) 2m

(Note) About power cable length between display to rectifier, see "9.5.3 Selecting

a Long Cable"



Install each equipment so that the length of the cable between a snanner unit and a

display unit does not exceed 20m. If the regular length is exceeded, it may become

the cause of causing poor adjustment and the defect of a system of operation.

・The standard cables are provided with connectors and plugs.

Attention

229

9 Installation

This chapter has been written for the service technicians to read in case of installation.

WARNING

Only specialized personnel shall perform installation work.

Installation work performed by personnel other than specialized personnel

may cause breakdown of the equipment, poor performance, fire, severe elec-

tric shock and other property and human damages.

9.1 General

Proper installation of a radar unit is essential for extracting full capability of the unit

reliably and for facilitating troubleshooting and maintenance. Follow the guidelines

given below when installing the radar unit.

(a) Install the scanner unit as high as possible while taking its weight into consideration.

(b) Install the display unit in the wheel house for comfortable observation.

conductors with an internal shield. The maximum permissible cable length is 20 m.

Cables larger than 20 m would deteriorate the radar performance of the radar unit.

230

9.2 Installing the Scanner Unit

9.2.1 Selecting the installation location

CAUTION

The scanner unit shall be installed where there are not large obstacles in the

direction of the ship's heading line in the same plane.

If there is a large impediment in the same plane as the scanner unit, this may

cause the generation of folse echoes. In particular, if such folse echoes

appear at the ship's heading line, monitoring will be difficult and this may

cause inadequate forecasting of danger.

Do not install the scanner unit near chimney's or the exhaust of chimneys.

Soot will cause the performance of the radar to decrease and heat may cause

breakdown.

Do not install direction antenna or VHF antenna in the vicinity of the scanner

unit. Doing so may cause noise in the antenna reception.

Consideration should be given to separating the radar cable from the cables

for the direction antenna and VHF antenna.

These cables should never be bundled into one. Doing so may cause noise

in the antenna reception.

9.2.2 Installation procedure

(a) If it is found that there is no height above the roof of the wheel house enough to directly

accommodate a scanner unit, install a pedestal or radar mast.

(b) In addition to a pedestal or radar mast, it is necessary to provide an appropriate staging

for convenience in installation, maintenance, adjustment, and repair of the scanner

unit.

231

(1) Precautions to be observed when installing the scanner unit on a power boat

 The bow of a power boat is kept in a raised position when it is running at a high

speed. Consequently, if the radar's scanner unit is installed horizontally when the

boat is stopped, the following conditions will occur if the trim (elevation angle of the

ship's bow at run time) exceeds 1/2 of the vertical beam width (θ):

• On the front side, the water surface lies outside the beam, weakening the radio

wave that is incident to the target on the water surface. Consequently, the

echo generated by this target is will hardly be visible on the radar screen.

Conversely, on the rear side:

• Since the radio wave that is incident to the water surface is stronger, strong sea

clutter will develop. For vessels on which the trim is 1/2 or greater than the ver-

tical beam width (θ), it is recommended that the scanner unit be installed in

such an orientation that it is tilted forwards.

[When the ship is stopped or running at a slow speed]

[High speed run: the lower part of the beam is almost horizontal.]

Beam width θ

Radar scanner unit

Horizontal line

Beam width θ

Radar scanner unit

Horizontal line

232

(2) Precautions to be observed when installing the scanner unit on a yacht

 A yacht heels on the lee side when a wind with a certain level of force blows.

The following condition occurs if the heel angle exceeds 1/2 of the beam width:

• On the windward side, the water surface lies outside the beam, weakening the

radio wave that is incident to the target on the water surface. Consequently,

the echo generated by this target is will hardly be visible on the radar screen.

Conversely, on the lee side:

• Since the radio wave that is incident to the water surface is stronger, strong sea

clutter will develop. For yachts on which the heel is 1/2 or greater than the ver-

tical beam width (θ) , it is recommended that the scanner unit be installed on a

mounting base so that the scanner unit can be tilted on the left and right sides

according to the heel angle.

Beam width θ

Heel angle Φ

Radar scanner unit

Horizontal line

Wind

233

9.2.3 Connection of cables to be assembled

(1) Radome scanner unit (NKE-249)

234

235

(2) Rotary scanner unit (NKE-250)

236

9.3 Installing the Display Unit

9.3.1 Selecting the installation location

 The display unit should be installed at least 1 meter from the magnet compass.

If the display unit is installed in the vicinity of the magnet compass, the compass

may be affected.

Consider the following points when determining the location of the display unit:

(a) Install the display unit in a location that provides the operator with a convenient

viewing position.

(b) Take after-installation maintenance into consideration.

9.3.2 Installation procedure

(a) Install the display unit by drilling holes using the exterior dimension drawings of the

display unit as reference. Monitoring will be facilitated if the display is positioned so

that the operator faces the ship's heading line (the CRT faces astern).

(b) Wherever possible, select a location that is free of vibration.

9.3.3 Connecting the power cable

(a) Connect the power cable plug to the J1(POWER) connector on the rear panel of the

display unit.

(b) Connect the plug of the cable from the scanner unit to the J2(SC UNIT) connector on the

rear panel of the display unit.

● Use an adequately heavy earth cable when connecting the earth terminal of the

display unit to the ship body.

Attention

237

9.3.4 Display unit rear panel

GPS connector (J3)

3 4 5

1 7

External connector (J4)

Ｆ１

Ｆ１Ｆ１

Ｆ１

Ｆ２

Ｆ２Ｆ２

Ｆ２

Ｅ

ＥＥ

Ｅ

ＥＸＴ２

ＥＸＴ２ＥＸＴ２

ＥＸＴ２

ＥＸＴ１

ＥＸＴ１ＥＸＴ１

ＥＸＴ１

ＧＰＳ

ＧＰＳＧＰＳ

ＧＰＳ

ＰＯＷＥＲ

ＰＯＷＥＲＰＯＷＥＲ

ＰＯＷＥＲ

ＳＣ

ＳＣＳＣ

ＳＣ

ＵＮＩＴ

ＵＮＩＴＵＮＩＴ

ＵＮＩＴ

Ground terminal Power connector (J1) Cable assembly connector (J2)

Fuse (F2)

Fuse (F1)

GPS connector (J3) External

connector (J4)

Rubber stopper

(for connecting the optional ex-

ternal connector (J5))

① +12V

② GND

③ NAVCOM

④ NAVRX

⑤ NAVTX

① DATA+

② DATA-

③ CMPS+

④ CMPS-

⑤ SVD (Image signal)

⑥ SHS (Horizontal synchronization signal)

⑦ SVS (Vertical synchronization signal)

⑧ GND

To GPS or LORAN

To cursor data input device

To electromagnetic compass/ GPS compass

To sub-monitor

238

※ The following should be used as the plug side connector for connecting to J3 and J4

Connector Type JRC Code

For J3 LTWD-06BFFA-L180 5JCAS00031

For J4 LTWD-08BFFA-L180 5JCAS00027

9.3.5 Connection of the external buzzer

CAUTION

Only qualified service personnel should perform external buzzer cabling work.

Erroneous connection may cause breakdown or defective operation.

The 5 pin connector side of the cable equipped with connector (7ZCRD0749) should be

attached to EXT2 on the rear panel of display unit after removing the rubber stopper. The

2 pin connector side should be connected to J5 of the display unit main control circuit

(CMC-1156). The 3 pin connector need not be.

Use the 5 pin connector (Type: LTWD-05BFFA-L180, JRC code: 5JCAS00030) for the plug

side connector connected to EXT2.

J5 (2 pin)

Main control circuit

(CMC-1156)

Power supply circuit

(CBD-1596)

External connector J5 (5 pin)

ttach after removing the rubbe

stopper.

2 pin connector

239

EXT2 Connector (J5)

Example of connection of an external buzzer

Example of Parts

Name Manufacturer Type JRC Code

Relay Takamizawa LZ12H 5KLAC00033

Diode Hitachi V06C 5TXAE00016

① EXTBUZ

② +12V

③

④

⑤

To external buzzer control

Buzzer

EXTBUZ

+12V

12V relay

Protective diode

to EXT2

LTWD-05BFFA-L180

240

9.3.6 Connecting an electromagnetic compass

 Ensure that the output of the inboard power supply and rectifier unit and connection to

the power cable is correct.

Erroneous connection or voltage may cause breakdown.

It is possible to input information on bearing to the radar display unit if you use the elec-

tromagnetic compass with a NMEA0183 output terminal.

(It is impossible to connect if you use the electromagnetic compass without a NMEA0183

output terminal.)

(1) Solder the data cable of electromagnetic compass (with NMEA0183 output) to the 8 pin

connector. The polarity is as shown below and care should be taken in making this

connection.

8 pin connector (pin 3) Electromagnetic compass data (+)

8 pin connector (pin 4) Electromagnetic compass data (-)

Type of LTWD-08BFFA-L180 (JRC code: 5JCS00027) should be used as the 8 pin

connector.

 Unless the connection between the 8 pin connector and data cable is correct,

correct data will not be obtained.

(2) Connect the 8 pin connector to J4 (EXT1) on the rear panel of the display unit.

This completes the cabling of the electromagnetic compass.

Attention

Electromagnetic compass

Ｆ１

Ｆ２

Ｅ

ＥＸＴ２

ＥＸＴ１

ＧＰＳ

ＰＯＷＥＲ

ＳＣＵＮＩＴ

8P connector

(

black

)

Radar display unit rear panel

3 4 5

8 Data －

Data ＋

241

9.4 Modifications to be Made to the Inboard Power Supply



Be sure to use the correctly rated fuse. In the event incorrectly rated fuse is used,

this may cause breakdown in the equipment.

 Make modifications as shown below based on the inboard power supply.

(Fuse for 24V is incorporated upon shipment of the equipment)

1.1.

1. Display unit

Display unit Display unit

Display unit

Fuse rating

F1 F2

Inboard power supply

Rating JRC Code Rating JRC Code

DC12V 6.3A 5ZFAD00336 10A 5ZFAD00539

DC24/32V 3.15A 5ZFAD00227 5A 5ZFAD00364

2. Scanner unit

2. Scanner unit2. Scanner unit

2. Scanner unit

No modifications need to be made with respect to the scanner unit.

Attention

242

9.5 Cable Assemblies

9.5.1 Inter-unit cable (CFQ6774-10/15/20, CFQ6882-10/15/20)

(a) This cable is used to connect the display unit to the scanner unit.

(b) Use the following cables with connectors for this radar equipment.

Cable length JRC Code for JMA-2343 JRC Code for

JMA-2344

Remarks

15m

10m

20m

CFQ6774-15

CFQ6774-10

CFQ6774-20

CFQ6882-15

CFQ6774-10

CFQ6882-20

Standard

Option

Color Number of Conduc-

tors/Diameter (mm)

Signal Name

Shielded wire (conductor) : Black

7/0.20 TI

Shielded wire (shield) TIE

Co-axial cable (conductor) 7/0.20 VD

Co-axial cable (shield) VDE

Red (Thick) 50/0.18 1A

Yellow (Thick) 50/0.18 1A

Blue (Thick) 50/0.18 2A

Purple (Thick) 50/0.18 2A

Green (Thick) 50/0.18 1A

Pink (Thick) 50/0.18 1A

Gray (Thick) 50/0.18 2A

Brown (Thick) 50/0.18 2A

Orange (Middle thick)

34/0.18 BP

Green 7/0.20 BZ

Yellow 7/0.20 COM+

White

Twisted pair

7/0.20 COM-

※The outside diameter size of the cable :11.5±0.5 [mm]

Only JMA-2344

243

9.5.2 Power cable (CFQ-6776)

The radar unit is provided with a 2 m power cable with connectors

Color Number of Conductors

/Diameter

Cross Section

(mm2) Polarity

White 50/0.18 1.25

＋

Black 50/0.18 1.25

－



Ensure that the output of the inboard power supply and rectifier unit and connection to

the power cable is correct.

Erroneous connection or voltage may cause breakdown.

9.5.3 Selecting a long cable

 The effective voltage of the input to the radar is the voltage at the inboard power

supply minus the voltage drop caused by the power cable. Too thin or long a

power cable incurs a large voltage drop and may not be able to supply adequate

power to the radar. In is recommended that the following guidelines be observed

when selecting the power cable for your radar:

(a) Consider the possible voltage regulation of the inboard power supply (Vs).

(b) Use the following equation to calculate the voltage drop:

V=2LRKI

L：represents the cable length.

R：represents the direct-current resistance (<Ω>/m) at 20<℃>

K：represents the conductor resistance temperature coefficient (= 1.22)

I ：Maximum peak current (A)

(Imax) of several cables.

Cable Type R (20℃) Imax (45℃, continuous)

CVVS2×1.25 16.7 Ω.km 13A

CVVS2×2.0 9.42 Ω/km 19A

CVVS2×3.5 5.30 Ω/km 26A

The cable to be used must possess a sufficient permissible current (Imax) characteristic.

Attention

244

9.6 After-installation Adjustments

9.6.1 Installation-time check

(a) After completing the installation procedure, it is necessary to check the radar unit to

verify that all installation steps have been conducted as instructed. In particular,

check for correct cabling, for normal component operating state, for water leakage in the

scanner unit, and for proper grounding of braided shielding cable.

9.6.2 Functional checks

(a) After completing the installation-time check and before checking the operation of the

radar, make sure that the output voltages of the inboard power supply fall within their

permissible range.

(b) Read "3 Basic Operation" carefully and thoroughly and make sure that the radar

functions normally. Then, manipulate all controls and menu functions to ensure that

they function normally.

"9.7 Adjustment Procedures" carefully and follow the instructions given in that section.

9.6.3 Adjustment items

(a) Radar's bearing adjustment is mandatory.

(b)

If the control is not positioned near the center of the scale during tuning or if tuning fails,

make a coarse tuning from the "TUNE PRESET" menu.

actual range, adjust the range from the "DISPLAY TIMING" menu.

(d) The "BUZZER" menu can be used to adjust the volume of the alarming buzzer.

(e) The "STC PRESET" menu can be used to adjust the STC.

245

9.6.4 Rectifier unit

● The rectifier unit can run on inboard voltages of 100/110/115 VAC and 200/220/230

VAC provided that connections at the input terminals on the NBA-797A T701 are

changed. The figures below show how to change the connections at the input ter-

minals.

100/110/115 VAC 200/220/230 VAC

[Reconnecting the NBA-797A input terminals]

Reconnect according to the input voltage.

115V

110V

100V

This terminal must not be reconnected.

Reconnect according to the input voltage.

230V

220V

200V

This terminal must not be reconnected.

246

9.7 Adjustment Procedures

9.7.1 General adjustments

1. Adjustments to be made when a part is replaced

1. Adjustments to be made when a part is replaced1. Adjustments to be made when a part is replaced

1. Adjustments to be made when a part is replaced

Adjustments need to be performed when major parts of the radar unit. are replaced.

(a) When the V101 magnetron is replaced Tuning

(b) When the E101 front end is replaced Tuning

When the CRT monitor PCB is replaced Brilliance level adjustment

Focus adjustment

＊: When exchanging V901 (CRT), the Direction coil implement in the stuck condition.

Incidentally, It is possible to arrange in cathode-ray tube monitor chassis (CKJ-159)

2. CRT monitor off center adjustment

2. CRT monitor off center adjustment2. CRT monitor off center adjustment

2. CRT monitor off center adjustment

(a) This adjustment must be performed on the centering magnet (permanent magnet)

located immediately behind the deflection coil. This permanent magnet is made up of

two doughnut-like disks.

(b) Turn the centering knob so that the neck of the Cathod-ray tube is in alignment with the

center of the PPI screen.

3. Adjusting the brilliance level of the CRT monitor screen.

3. Adjusting the brilliance level of the CRT monitor screen.3. Adjusting the brilliance level of the CRT monitor screen.

3. Adjusting the brilliance level of the CRT monitor screen.

(a) Set the brilliance level of the CRT monitor screen to its maximum from the menu.

● Please refer to "3.2.1 Changing the brightness of the screen" for the method of ad-

justment.

(b) Turn potentiometer R451 on the CRT monitor PCB so that no raster appears in the

non-displayable area. (Turn the potentiometer slowly since the circuit's sensitivity is

very high.)

4. Adjusting the focus of the CRT monitor screen

4. Adjusting the focus of the CRT monitor screen4. Adjusting the focus of the CRT monitor screen

4. Adjusting the focus of the CRT monitor screen

(a) Turn potentiometer R951 on the neck PCB in the display unit so that the range rings

and video images appear most clearly.

247

9.7.2 Adjusting the scanner unit

The scanner unit has several locations that need adjustment. They are factory set and

normally need not be adjusted by the user. If it is necessary to make functional checks

during inspection or repair, make the adjustments that are explained below.

WARNING

Hi-voltage Caution

High-tension voltages of 4,000 volts or higher are present at the modulator

units (CME-307 or CME-308). The modulator unit must be accessed only by

qualified service engineers.

Inadvertent manipulation may result in severe electric shock.

1. Adjusting the AVR output voltage from the modulator

1. Adjusting the AVR output voltage from the modulator1. Adjusting the AVR output voltage from the modulator

1. Adjusting the AVR output voltage from the modulator

(a) Place the radar unit into the transmission state (the range scale set to 12NM), connect a

VOM across J203-14PIN on the CME-307 or CME-308 and the GND terminal, and

adjust RV2 so that the output voltage reads +8 volts.

2. Adjusting the tuning indicator level of the receiver

2. Adjusting the tuning indicator level of the receiver2. Adjusting the tuning indicator level of the receiver

2. Adjusting the tuning indicator level of the receiver

(a) If the tuning mode is set to "AUTO", reset it to "MANUAL".

(b) Tune the receiver with the range scale set to 12 NM.

9.7.3 Adjusting the display unit

The display unit has several locations that need adjustment. They are factory set and

normally need not be adjusted by the user. If it is necessary to make functional checks

during inspection or repair, make the adjustments that are explained below.

1. Adjusti

1. Adjusti1. Adjusti

1. Adjusting the brilliance level

ng the brilliance levelng the brilliance level

ng the brilliance level

(a) Set the brilliance level of the screen to its maximum from the [BRIL] key.

(b) Turn potentiometer R451 on the CRT monitor PCB so that no raster appears in the

non-displayable area. (Turn the potentiometer slowly since the circuit's sensitivity is

very high.)

2. Adjusting the focus of the CRT monitor screen

2. Adjusting the focus of the CRT monitor screen2. Adjusting the focus of the CRT monitor screen

2. Adjusting the focus of the CRT monitor screen

(a) Turn potentiometer R951 on the neck PCB in the display unit so that the range rings

and video images appear most clearly.

248

3. Adjusting the tilt angle of the display unit

3. Adjusting the tilt angle of the display unit3. Adjusting the tilt angle of the display unit

3. Adjusting the tilt angle of the display unit

(a) The angle of the screen can be adjusted by loosening the lock screw on the deflection coil

assembly at the neck of the CRT tube and turning the entire screen. The user can also

adjust the screen position using the centering magnet.

4. Adjusting the C

4. Adjusting the C4. Adjusting the C

4. Adjusting the CRT display

RT displayRT display

RT display

In addition to adjustment steps 1. to 3. explained above, CRT monitor adjustments in-

clude the following:

(a) Horizontal level adjustment CCN-366, L400

(b) Vertical size adjustment CCN-366, R353（V. S IZ E）

(d) Focus adjustment CCN-366, R951

WARNING

Hi-voltage Caution

The CRT monitor (CCN-366) generates high electric voltage about 10kV and

on service personnel should touch parts inside the display.

Inadvertent manipulation may result in severe electric shock.

5. Adjusting the AVR output voltage

5. Adjusting the AVR output voltage5. Adjusting the AVR output voltage

5. Adjusting the AVR output voltage

(a) Connect a high-precision voltmeter across pin TP1+3.3V on the CBD-1596 power supply

and the chassis, adjust potentiometer +3.3ADJ so that the output voltage reads +3.3±

0.02V.

● Be sure to connect the scanner unit when making this adjustment.

Attention

249

9.8 Initial Settings

This section will explain the method of initial setting of the radar unit. Initial setting

needs to be undertaken prior to initial use.

Initial setting includes:

(a) INITIAL SETTING 1

• Tuning preset (TUNE PRESET)

• Bearing adjustment (BEARING)

• 0 NM adjustment (DISPLAY TIMING)

• Main bang suppression level (MBS LEVEL)

• Main bang suppression range (MBS RANGE)

• Sensitivity preset (GAIN PRESET)

• Comparator preset (COMPARATOR PRESET)

• Sea surface clutter preset (STC PRESET)

• Antenna height preset (ANTENNA HEIGHT)

• GPS preset (GPS PRESET)

(b) INITIAL SETTING 2

• Setting the TD reception number (SET TD NUMBER)

• Simulator image display (SIMULATOR)

 Be sure to undertake initial setting prior to initial use.

 Unless initial setting has been undertaken, it is not possible to display the target or

measure the distance or bearing of a target correctly.

 INITIAL SETTING 1, the initial setting menu that is used here, is displayed by

pushing the ＥＮＴＥＲ key and ＭＥＮＵ key simultaneously.

Attention

250

9.8.1 Adjustment of the receiver

 This adjustment need not be changed in general as the equipment is adjusted

ex-factory.

 If the adjustment is changed inadvertently, it will not be possible to obtain the op-

timum tuning even when the TUNE control is operated.

1. Tune preset

1. Tune preset1. Tune preset

1. Tune preset

Here, rough adjustment of the tune will be undertaken.

(a)

Set the range to 12NM pushing the "▲(up)" or "▼ (down)" on the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

(b) Push the soft key

ＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳ

Ｍ－ＴＵＮＥ

Ｍ－ＴＵＮＥＭ－ＴＵＮＥ

Ｍ－ＴＵＮＥ

The method of tuning has been set to "manual".

(If the mode is already in manual tuning, this operation is not required.)

(d) Push the

ＭＥＮＵ

ＭＥＮＵＭＥＮＵ

ＭＥＮＵ

key and close the soft key menu.

(e) Push the

Ｘ－ＭＩＴ／ＯＦＦ

Ｘ－ＭＩＴ／ＯＦＦＸ－ＭＩＴ／ＯＦＦ

Ｘ－ＭＩＴ／ＯＦＦ

switch and wait for 10 minutes or more.

Transmission will begin.

After about 10 minutes, the transmission frequency will stabilize.

(f) Turn the [TUNE] control to the mid position.

(g) Select "TUNE PRESET" in the line "RECEIVER ADJUST" - the menu "INITIAL

SETTING 1".

(h) Pushing the "▲ (up)" or "▼ (down)" on the ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ key, adjust so that

the PPI image becomes the maximum size.

(i) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The adjustment has been completed.

251

2. Adjusting the central frequency

2. Adjusting the central frequency2. Adjusting the central frequency

2. Adjusting the central frequency

Adjustment is undertaken so that the image is largest when the deflection of the tune

level indicator is at the maximum.

(a) Undertake operations (a) through (e) of "1.Tune Preset".

(b) Adjust the image to the maximum using the [TUNE] control.

"INITIAL SETTING 1".

(d) Adjust to maximize the deflection of the tune level indicator pushing the "▲ (up)"

or "▼ (down)" on the ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ key.

(e) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The adjustment has been completed.

3. Adjusting the level of the tune level indicator

3. Adjusting the level of the tune level indicator3. Adjusting the level of the tune level indicator

3. Adjusting the level of the tune level indicator

Adjust the scale to correspond to the maximum deflection of the tune level indicator bar.

(a) Undertake operations (a) through (e) of "1.Tune Preset".

(b) Using the [TUNE] control, adjust to maximize the deflection of the tune level in-

dicator.

TIAL SETTING 1".

(d) Adjust so that the deflection of the tune level indicator is 80% to 90% of the

indicator area pushing the "▲ (up)" or "▼ (down)" on the ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ key.

(e) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The adjustment has been completed.

252

9.8.2 Adjusting the noise level

This operation adjusts the basic level of the echo that is displayed on the PPI screen.

 This adjustment need not be changed in general as the equipment is adjusted ex

factory.

 If the adjustment is changed inadvertently, it will not be possible to obtain optimum

images as a phenomenon causing reduction in sensitivity may be generated.

(a) Select "COMPARATOR PRESET" in the menu "INITIAL SETTING 1".

(b) Adjust the noise level pushing the "▲ (up)" or "▼ (down)" on the ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ key.

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The noise level adjustment has been completed.

9.8.3 Adjusting the bearing

This operation adjusts the bearing on the PPI screen.

(a) Select "RM" in the line "TM/RM" - the menu "FUNCTION".

If the mode is already in RM, this operation is not required.

(b) Select "H-UP" in the line "HDG MODE" - the menu "FUNCTION".

If the mode is already in H-UP, this operation is not required.

Select an image of a target within 1NM to 2NM that can be seen with the naked eye and

that is not moving.

(d) Measure the bearing of the target from the ship's bow using the ship's compass.

For example, assume the target is stationary at a bearing of 25 degrees from the ship's bow.

(e) Select "BEARING" in the menu "INITIAL SETTING 1".

The EBL for bearing adjustment will be displayed.

This EBL is different from #1EBL or #2EBL.

Attention

253

(f) Push the cross key, and align the EBL to the image of target's echo.

(g) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

(h) Using the cross key, align the EBL to the bearing of the target measured in (d).

The PPI screen also rotates with the EBL.

(i) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The bearing adjustment has been completed.

9.8.4 0 NM adjustment (Initial setting of distance)

This operation is for calibrating distance on the PPL screen.

(a) Select "RM" in the line "TM/RM" - the menu "FUNCTION".

If the mode is already in RM, this operation is not required.

(b) Select "H-UP" in the line "HDG MODE" - the menu "FUNCTION".

If the mode is already in H-UP, this operation is not required.

(c)

Adjust the range to 0.125NM pushing the "▲ (up)" or "▼ (down)" on the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

(d) Determine the target.

Select a target from among echo image on the PPI with respect to which the distance

from the ship is known.

In this case, it is assumed that a stationary target 0.08NM from the ship has been se-

lected.

(e) Push the

ＶＲＭ

ＶＲＭＶＲＭ

ＶＲＭ

key.

#1VRM/#2VRM will be displayed.

In the event #1VRM is to be used, select "FIX" in the line "EBL1/VRM1" - the menu

"FUNCTION".

(f)

Using the up and down functions of the cross key, adjust the VRM to the distance to the target.

Adjust to the actual distance to the target.

(g) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

(h) Select "DISPLAY TUNING" in the menu "INITIAL SETTING 1".

254

(i) Adjust the proximate perimeter of the target to the distance to the VRM pushing the "▲

(up)" or "▼ (down)" on the ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ key.

(j) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The 0 NM adjustment has been completed.

Reference:

Reference:Reference:

Reference:

When

WhenWhen

When

there

therethere

there

isis

nono

target

targettarget

target

with

withwith

with

known

knownknown

known

distance

distancedistance

distance

from

fromfrom

from

the

thethe

the

ship.

ship.ship.

ship.

If there is no target with known distance from the ship, it is possible to undertake 0 NM

adjustment using the following simplified method.

(A) Steps (a) through (c) are the same as with a target of known distance.

(B) Select a target that represents a long linear line such as the shoreline or embankment.

(D) Adjust so that the target becomes a straight line on the PPI screen pushing the "▲

(up)" or "▼ (down)" on the ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ key.

The distance is too great The distance is just right The distance is too short

(E) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The 0 NM adjustment has been completed.

9.8.5 Setting the antenna height

This operation sets the height of the antenna from the sea surface.

(a) Select "ANTENNA HEIGHT" in the menu "INITIAL SETTING 1".

Position of the ship Ship's heading marker

Target

255

(b) Select the height of the radar antenna among "UNDER 5m", "5m TO 10m", and "MORE

THAN 10m".

9.8.6 Presetting the sensitivity

This operation sets the maximum sensitivity when [GAIN] control is turned.

This adjustment should not be undertaken without reason.

When undertaking this adjustment, also undertake "9.8.2. Adjustment of the Noise Level".

(a) Push the soft key

ＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹ

(b) Push the soft key 1 and select

ＥＸＰ

ＥＸＰＥＸＰ

ＥＸＰ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

(d) Turn the [SEA] control to the minimum (turn to maximum counterclockwise).

(e) Turn the [GAIN] control to the maximum (turn to maximum clockwise).

This maximizes the strength of the echo on the PPI screen.

(f) Select "GAIN PRESET" in the menu "INITIAL SETTING 1".

(g)

Adjust the sensitivity level pushing the "▲ (up)" or "▼ (down)" on the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

(h) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The maximum level of gain has been set.

9.8.7 Presetting the sea clutter

This operation sets the maximum level of suppression when the [SEA] control is turned.

This adjustment should not be undertaken without reason.

(a) Set the range to 0.125NM pushing the "▼ (down)" on the ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ key.

(b) Undertake tuning adjustment using the [TUNE] control.

ＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹ

256

(d) Push the soft key 1 and select

ＥＸＰ

ＥＸＰＥＸＰ

ＥＸＰ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

(e) Turn the [GAIN] control to the maximum (turn to maximum clockwise).

(f) Turn the [RAIN] control to the minimum (turn to maximum counterclockwise).

(g) Turn the [SEA] control to the maximum (turn to maximum clockwise).

The strength of the echo on the PPI screen is maximized with sea surface clutter sup-

pression maximized.

(h) Select "STC PRESET" in the menu "INITIAL SETTING 1".

(i)

Adjust the level of suppression pushing the "▲ (up)" or "▼ (down)" on the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

The PPI screen near the center adjusts to the grade projected slightly.

(j) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

Suppression of sea surface clutter has been set at the maximum level.

9.8.8 Suppression of main bang

This adjustment is undertaken to suppress main bang that is the reflected signal from

three dimensional circuits such as the wave guide that normally appears at the center of

the radar display as a circle.

Optimum adjustment is achieved when the main bang image remains lightly on the

screen.

 This adjustment should not be undertaken without reason. Erroneous adjust-

ment may cause targets that are proximate to be erased from the screen.

(a) Set the range to 0.125NM pushing the "▼ (down)" on the the ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ key.

(b) Select "OFF" in the line "PROCESS" - the menu "FUNCTION".

ＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹＤＩＳＰＬＡＹ

ＤＩＳＰＬＡＹ

Attention

257

(d) Push the soft key 1 and select

ＥＸＰ

ＥＸＰＥＸＰ

ＥＸＰ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

(e) Push the the soft key

ＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳＰＲＯＣＥＳＳ

ＰＲＯＣＥＳＳ

(f) Push the soft key 1 and select

ＡＵＴＯ

ＡＵＴＯＡＵＴＯ

ＡＵＴＯ

ＯＦＦ

ＯＦＦＯＦＦ

ＯＦＦ

(g) Turn the [GAIN] control to the maximum (turn to maximum clockwise).

(h) Turn the [SEA] control to the mid position.

(i) Turn the [RAIN] control to the minimum (turn to maximum counterclockwise).

(j) Select "MBS LEVEL" in the menu "INITIAL SETTING 1".

(k)

Adjust the suppression level pushing the "▲ (up)" or "▼ (down)" on the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

(l) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The suppression level of the main bang has been determined.

(

) Select "MBS RANGE" in the menu "INITIAL SETTING 1".

(n)

Adjust the suppression range pushing the "▲ (up)" or "▼ (down)" on the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

(o) Push the

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

Adjustment of the suppression range of the main bang has been completed.

9.8.9 Display of simulator image

By activating this function, it is possible to display a demonstration screen on the PPI

screen.

 To make the setting of this function effective, the power must be once switched off.

(a) Push the

ＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦ

key.

The display will enter the standby mode.

258

(b) Select "INITIAL SETTING 2" in the menu "INITIAL SETTING 1".

9.8.10 Setting the TD reception number

This operation is for selecting the number of the TD (LORAN C time difference) to be

received.

(a) Select "INITIAL SETTING 2" in the menu "INITIAL SETTING 1".

(b) Move the cursor to the extent of the value shown in the "SET TB NUMBER" - the menu

"INITIAL SETTING 2".

(d) Select the TD number to be received pushing the "▲ (up)" or "▲ (down)"

on the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

When the numbers are selected, the following field data of NMEA is displayed.

1: TD1 field of the GTD/GLC sentence.

2: TD2 field of the GTD/GLC sentence.

3: TD3 field of the GTD/GLC sentence.

4: TD4 field of the GTD/GLC sentence.

5: TD5 field of the GTD/GLC sentence.

A: A field of the RMA sentence

B: B field of the RMA sentence

259

9.8.11 GPS/DGPS

1. Initial setting of GPS

1. Initial setting of GPS1. Initial setting of GPS

1. Initial setting of GPS

This operation is for undertaking initial setting of GPS. The GPS receiver measures posi-

tion without initial setting but 10 or more minutes may be required after initial setting.

● Content of settings

Ship position : Approximate latitude and longitude is sufficient

Exclusion satellite : When unhealth satellite is used, precision may deteriorate.

The satellite number input here is not used for measuring the

position.

Geodetic system : Japan is "02"

Antenna height : Input the height of the antenna from the sea surface.

Fix mode : Since the height of the antenna is fix in the case of an ocean

going vessel, greater stability in position is obtained in 2D (two

dimensions).

DOP level : If only position results with high precision are intended to be

used, designate 10 or less or 5 or less.

Position average :

When variance in position needs to be minimized, select

ＬＯＮＧ

ＬＯＮＧＬＯＮＧ

ＬＯＮＧ

When response needs to be maximized select

ＮＯＮＥ

ＮＯＮＥＮＯＮＥ

ＮＯＮＥ

. However,

with this latter setting, variance will increase.

(a) Select "GPS" in the line "GPS PRESET" - the menu "INITIAL SETTING 1".

The menu "GPS" will be displayed.

(b)

Select the items in the cross key and change the set value using the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

In order to change the ship's "N/S" or "E/W" position using the left and right keys

of the cross key.

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The setting has been determined.

(d) Select "SEND DATA" in the menu "GPS".

The GPS setting will be implemented.

2. Initial setting of DGPS

2. Initial setting of DGPS2. Initial setting of DGPS

2. Initial setting of DGPS

In the event high precision position determination is intended using DGPS, it is nec-

essary to set the beacon receiver.

260

● Setting mode

MANUAL : This operation sets the frequency and baud rate of the beacon receiver.

This allows receipt of DGPS at an early stage but receipt is not possible

unless the ship is in the beacon receipt area that is set.

AUTO : Automatic search of the beacon transmission station is undertaken for

receipt. Time is required for this search.

(a) Select "DGPS" in the line "GPS PRESET" - the menu "INITIAL SETTING 1".

The menu "DGPS PRESET" will appear.

(b)

Select the items in the cross key and change

the

set value using the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

Changing "N/S" and "E/W" of the ship's position is also set pushing the "▲ (up)"

or "▼ (down)" on the

ＲＡＮＧＥ

ＲＡＮＧＥＲＡＮＧＥ

ＲＡＮＧＥ

key.

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key.

The setting has been determined.

(d) Select "SEND DATA" in the menu "DGPS PRESET".

The DGPS setting will be implemented.

3. Status of reception of GPS and DGPS

3. Status of reception of GPS and DGPS3. Status of reception of GPS and DGPS

3. Status of reception of GPS and DGPS

This operation displays the status of reception of the GPS receiver and DGPS receiver.

(a)

Select "CONDITION" in the line "GPS PRESET" - the menu "INITIAL SETTING 1".

The status of reception of the GPS receiver and DGPS receiver will be displayed.

The display of the reception status of GPS will display the conditions of the following items

only when the sensor type receiver such as JLR-4310 is connected and operating normally.

● Items

Ship position : When the ship's position is determined, the latitude and lon-

gitude of the position will be displayed.

GPS internal time : The world time as measured by the GPS receiver will be dis-

played.

Altitude : The altitude of the ship will be displayed. However, when

the fix mode is 2D (two dimension), the height of the antenna

that was input at initial setting will be displayed.

DOP : The precision of the results of the measurement will be dis-

played. If the value is 20 or above, the precision is poor.

261

Reception satellite : The number of the satellite used for the measurement will be

displayed.

Bearing, elevation angle

: The bearing and elevation angle of the satellite will be dis-

played.

Signal strength : The strength of the signal of the satellite from which signals

are being received will be displayed. If the value is 20 or

less, the satellite may not be usable for measurements.

The following items will be displayed only when a beacon receiver is connected and

operating normally.

● Items

Frequency : The frequency of the beacon station from which signals are

being received will be displayed.

Baud rate : The baud rate of the beacon station from which signals are

being received will be displayed.

RSSI : The reception strength of the beacon station from which sig-

nals are being received will be displayed. If the value is 100

or less, the beacon may be not possible to receive signals.

262

List of Geodetic Systems

No. Name

0 WGS-84

1 WGS-72

2 Japan

3 North American 1927 (U.S)

4 North American 1927 (Canada & Alaska)

5 European 1950 (Europe)

6 Australian geodetic 1966 (Australia)

7 Ordance Survery of Great Britain (England)

8 NAD-83

9 － (no use)

10 － (no use)

11 ADINDAN (Etiopia & Sudan)

12 ARC 1950 (Botswana)

13 AUSTRALIAN GEODETIC 1984 (Australia)

14 BERMUDA 1957 (the Bermudas)

15 BOGOTA OBSERVATORY (Columbia)

16 CAMPO INCHAUSPE

17 CHATHAM 1971

18 CHUA ASTRO (Paraguay)

19 CORREGO ALEGRE (Brazil)

20 DJAKARTA (VATAVIA) (Sumata)

21 EUROPEAN 1979 (Europe)

22 GEODETIC DATUM 1949 (New Zealand)

23 GUAM 1963 (Guam)

24 HAYFORD 1910 (Finland)

25 HJORSEY 1955 (Ice land)

26 INDIAN (India & Nepal)

27 IRELAND

28 KERTAU 1948 (West Malaysia)

29 L.C.5 ASTRO (Cayman Black Island)

30 LIBERIA 1964 (Liberia)

31 LUZON (Philippines)

32 MERCHICH (Morocco)

33 MINNA (Cameroon)

263

34 NAHRWAN (Oman)

35 NAPARIMA, BWI (Trinidad and Tobago)

36 OLD EGYPTIAN (egypt)

37 OLD HAWAIIAN (the Hawaii Island)

38 PICO DE LAS NIEVES (the Canary Island)

39 PROVISIONAL SOUTH AMERICAN 1956 (South America)

40 PROVISIONAL SOUTH CHILEAN 1963 (Southern Chile)

41 PUETRO RICO (Puerto Rico and V irgin Island)

42 QORNOQ (South Greenland)

43 RT90 (Sweden)

44 SANTA BRAZ (Sao Maguel, Santa Maria Island)

45 SOUTH AMERICAN 1969 (South America)

46 SOUTHWEST BASE (Faial,Graciosa,Pico,Jorge and terceira Island)

47 TIMBALAI 1948 (Brunei and East Malaysia)

264

9.9 Returning to the Initial Setting Conditions

In the event such phenomena as the distorted screen or the keys becoming inoperable

occurs while the radar is in use, the following procedures shall be taken to initialize the

system.

 When initialization is undertaken, all setting excluding the menu "INITIAL SET-

TING 1" and "INITIAL SETTING 2" will be reset to the ex-factory shipment condi-

tions.

(a) Push the

ＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦ

key and

Ｘ－ＭＩＴ／ＯＦＦ

Ｘ－ＭＩＴ／ＯＦＦＸ－ＭＩＴ／ＯＦＦ

Ｘ－ＭＩＴ／ＯＦＦ

key simultaneously.

Power is turned off.

(b) Push the

ＭＥＮＵ

ＭＥＮＵＭＥＮＵ

ＭＥＮＵ

key,

ＥＮＴＥＲ

ＥＮＴＥＲＥＮＴＥＲ

ＥＮＴＥＲ

key and

ＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦＳＴＢＹ／ＯＦＦ

ＳＴＢＹ／ＯＦＦ

key

simultaneously.

Power will be turned on as in normal operation for turning on power.

Attention

265

9.10 Maintenance

9.10.1 General maintenance

It is necessary to perform the maintenance services listed below to keep the radar unit

in good working conditions. Proper maintenance of the radar unit minimizes the possi-

bility of machine failures. The maintenance operations that are common to all compo-

nents of the radar unit are listed below.

1. Cleaning

1. Cleaning1. Cleaning

1. Cleaning

Remove dirt, dust, or water-spray from the radar unit enclosure and keep it as clean as

possible. Use a dry lint-free cloth.

2. Screw inspection

2. Screw inspection2. Screw inspection

2. Screw inspection

Check the screws used to assemble and secure the components of the radar unit for

loose connection.

3. Cabling check

3. Cabling check3. Cabling check

3. Cabling check

Check the cables connecting between the components (between the scanner unit and

display unit, display unit and power supply, and display unit and optional devices) for

poor connection.

WARNING

Before starting maintenance work, be sure to turn off the main power source.

If a rectifier unit is used, in particular, turn off power to the display unit. Note

that voltages from the rectifier unit are always present even if the radar is

stopped. It may result in sereve electric shock or breakdown.

266

9.10.2 Scanner unit

WARNING

When performing maintenance or inspection of the scanner unit, be sure to

shut off the safety switch of the scanner unit after turning off the power of the

display unit. Failure to do this may cause severe electric shock or

breakdown or the sudden movement of the scanner unit may cause bodily

injury or breakdown.

CAUTION

Since the magnetron in the modulator circuit emits strong magnetism, watches

or magnetic cards should not be brought into close proximity of the modulator

circuit. Doing so may cause breakdown and destruction of data contained in

such items.

1. Radiation unit

1. Radiation unit1. Radiation unit

1. Radiation unit

(a) A radiation surface of radiation unit (JMA-2343: Whole surface of the radome cover /

JMA-2344: Front side of radiation unit) contaminated by smoke, dust, or paint would

cause attenuation or reflections of radio waves, resulting in reduced radar performance.

Periodically check the radome scanner unit. If it proves dirty, wipe the radome surface

with a soft lint-free cloth moistened with alcohol or damped cloth.

CAUTION

Never use such solvent as Thinner, Gasoline, Benzen, Trichlene or Kentene

for cleaning. Those solvents deteriorate the surface.

267

2. Rotary drive block (JMA

2. Rotary drive block (JMA2. Rotary drive block (JMA

2. Rotary drive block (JMA-

-2344)

2344)2344)

2344)

(a) Lubricating gears

Apply grease to gears evenly using a knife or brush. This lubrication needs to be per-

formed at least semiannually. The shorter the lubrication period, the longer the gears will

endure.

Use Mobilux 2 from Mobile Oil Co., Ltd. or equivalent.

(b) Drive motor (JMA-2344)

(α) Reduction gears

The reduction gears need no lubrication unless it is subject to oil leakage. If

they are disassembled for overhaul, replenish lubricant "Beacon 325" from Esso

Standard.

(β) Motor

The life time of the brush unit is 2,000 hours. The brush needs to be replaced if

1/2 of the overall length is worn.

The commuter needs to be kept clean. If any carbon power fixed on the com-

muter cannot be removed with a dry cloth, burnish it with a sand paper # 150 to

#400.

The carbon brush can be removed by removing the caps located on both sides of

the bottom portion of the motor.

Description Type JRC code Quantity

Carbon Brush 54531-01 BRXP05247 2

Check the scanner unit mounting molts occasionally and apply paint semiannually to

protect them from corrosion.

Carbon brush

Contact with the commuter

Spring

268

9.10.3 Display unit

Cleaning the Display Unit Screen

Cleaning the Display Unit ScreenCleaning the Display Unit Screen

Cleaning the Display Unit Screen

● Dust on the CRT tube would reduce the glass transparency and make the vide

image dim. Wipe the screen surface with a soft lint-free cloth (made of flannel or

cotton). A cloth moistened with an antistatic agent would cause little problem.

When using it, wipe softly; never rub the screen surface with force.

Japan Radio NKE250 Marine Radar User Manual Manual 2 of 4 for CKENKE250

Japan Radio Co Ltd. Marine Radar Manual 2 of 4 for CKENKE250

Contents

Manual 2 of 4 for CKENKE250

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