Furuno FR-7112, FR-7062, FR-7252 User Manual 2

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Page 1

MARINE RADAR

MODEL

FR-7062/7112/7252

Page 2

(

9-52, Ashihara-cho, Nishinomiya, Japan

Telephone: 0798-65-2111 Telefax: 0798-65-4200

ll rights reserved.

Printed in Japan

Your Local Agent/Dealer

FIRST EDITION : APR. 1998 E : JAN. 25, 2001

PUB. No. OME-34590

YOSH)

FR-7062/7122/7252

Page 3

SAFETY INSTRUCTIONS

DANGER

Stay away from transmitting antenna.

The radar antenna emits microwave radiation which can be harmful to the human body, particularly the eyes. Never look directly into the antenna radiator from a distance of less than 1 m when the radar is in operation.

Radio Frequency Radiation Hazard

The radar antenna emits electromagnetic radio frequency (RF) energy which can be harmful, particularly to your eyes. Never look directly into the antenna aperture from a close distance while the radar is in operation or expose yourself to the transmitting antenna at a close distance.

Distances at which RF radiation levels of 100 and 10 W/m below.

Note: If the antenna unit is installed at a close distance in front of the wheel house, your administration may require halt of transmission within a certain sector of antenna revolution. This is possible—Ask your FURUNO representative or dealer to provide this feature.

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Page 4

DANGER

WARNING

Before turning on the radar make sure no one is near the scanner unit.

Prevent the potential risk of someone begin struck by the rotating antenna and exposure to RF radiation hazard.

WARNING

Do not open the equipment.

Improper handling can result in electrical shock. Only qualified personnel shold work inside the equipment.

Do not disassemble or modify the equipment.

Fire electrical shock or serious injury can result.

Turn off the power immediately if water leaks into the equipment or the equipment is emitting smoke or fire.

Use the proper fuse.

Fuse rating is shown in the chapter 5. Use of a wrong fuse can result in equipment damage

Do not operate the equipment with wet hands.

Electrical shock can result.

CAUTION

No one navigation device should ever be solely replied upon for the navigation of a vessel.

Always confirm position against all available aids to navigation, for safety of vessel and crew.

The guard alarm is a useful anti-collision aid, but does not relieve the operator of the responsibility to also keep a visual lookout for possible collision situations. The alarm should never be used as the sole means for detecting possible collision situations.

Continued use of the equipment can cause fire or electrical shock.

Do not place liquid-filled containers on the top of the equipment.

Fire or electrical shock can result if a liquid spills into the equipment.

Page 5

SART (Search and Rescue Transponder)

A Search and Rescue Transponder (SART) may be triggered by any X-Band (3 cm) radar within a range of approximately 8 n.miles. Each radar pulse received causes it to transmit a response which is swept repetitively across the complete radar frequency band. When interrogated, it first sweeps rapidly (0.4 µsec) through the band before beginning a relatively slow sweep (7.5 µsec) through the band back to the starting frequency . This process is repeated for a total of twelve complete cycles. At some point in each sweep, the SART frequency will match that of the interrogating radar and be within the pass band of the radar receiver . If the SART is within range, the frequency match during each of the 12 slow sweeps will produce a response on the radar display , thus a line of 12 dots equally spaced by about 0.64 nautical miles will be shown.

When the radar to the SART is reduced to about 1 n.miles, the radar display may show also the 12 respopnses generated during the fast sweeps. These additional dot responses, which also are equaly spaced by 0.64 nautical miles, will be interspersed with the original line of 12 dots. They will appear slightly weaker and smaler than the original dots.

Screen A: When SART is distant

Radar antenna beamwidth

Position of SART

SART mark

9500 MHz 9200 MHz

Sweep starting

length

Sweep time

7.5 µs

Low frequency sweep signal

Fast sweep signal

Screen B: When SART is close

Radar receiver bandwidth

95 µs

Showing SART marks on the radar display

To show the SART marks only on the radar display, detune the radar receiver by the manual tuning out of best tuning condition. This erases or weakens all normal radar echoes, but, the SART marks are not erased because the SAR T response signal scans over all frequencies in the 9 GHz band. When the radar approaches the SART in operation, the SART marks will enlarge to large arcs, blurring a large part of the screen. Reduce the sensitivity and adjust the sea clutter control of the radar.

iii

Page 6

Summary to detect SART response

1. Use range scale of 6 or 12 nm as the spacing between the SART responses is about

0.6 nm (1125 m) to distinguish the SART.

2. Turn off the A/C AUTO function.

3. Turn off the Interference Rejector.

General remarks on receiving SART

Radar range scale

When looking for a SART it is preferable to use either the 6 or 12 nautical mile range scale. This is because the total displayed length of the SART response of 12 (or 24) dots may extend approximately 9.5 nautical miles beyond the position of the SART and it is necessary to see a number of response dots to distinguish the SART from other responses.

SART range errors

When responses from only the 12 low frequency sweeps are visible (when the SART is at a range greater than about 1 n.mile), the position at which the first dot is displayed may be as mush as 0.64 n.mile beyond the true position of the SART. When the range closes so that the fast sweep responses are seen also, the first of these will be no more than 150 meters beyond the true position.

Page 7

FOREWORD

Congratulations on your choice of the FURUNO FR-7062/7112/7252 Marine Radar. We are confident you will see why the FURUNO name has become synonymous with quality and reliability.

For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for innovative and dependable marine electronics equipment. This dedication to excellence is furthered by our extensive global network of agents and dealers.

Y our radar is designed and constructed to meet the rigorous demands of the marine environment. However, no machine can perform its intended function unless properly operated and maintained. Please carefully read and follow the recommended procedures for operation and maintenance.

W e would appreciate hearing from you, the enduser, about whether we are achieving our purposes.

Thank you for considering and purchasing FURUNO equipment.

Note: In this manual, "N-type" means Netherlands specification radar.

Features

Your radar has a large variety of functions, all contained in a remarkably small cabinet.

The main features of the model FR-7062 are ¡ Traditional FURUNO reliability and qual-

ity in a compact, lightweight and low-cost radar.

¡ Durable brushless antenna motor. ¡ On-screen alphanumeric readout of all op-

erational information.

¡ Standard features include EBL (Electronic

Bearing Line), VRM (Variable Range Marker), Guard Alarm, Display Off Center, and Echo Trail.

¡ W atchman feature periodically transmits the

radar to check for radar targets which may have entered the alarm zone.

¡ Ship’ s position in latitude and longitude and

Loran C TDs, range and bearing to a waypoint, speed, heading, and course can be shown in the bottom text area. (Requires a navigation aid which can output such data in IEC 1162 format.)

¡ Zoom feature provided. ¡ Auto Plotter ARP-10 (option) acquires and

tracks up to 10 targets, and is installed in the display unit.

¡ Cursor position data (TLL) can be output to

a plotter (option).

Page 8

FOREWORD............................... v

MENU TREE ............................. vii

SYSTEM CONFIGURATION.... viii

1. PRINCIPLE OF OPERATION

1.1 What is Radar?.................................1-1

1.2 How Ships Determined Position

Before Radar ...................................1-1

1.3 How Radar Determines Range ........1-1

1.4 How Radar Determines Bearing......1-1

1.5 Radar Wave Speed and Antenna

Rotation Speed ................................1-1

1.6 The Radar Display ...........................1-1

2. BASIC OPERATION

2.1 Control Description .........................2-1

2.2 Display Indications and Markers .....2-2

2.3 Turning the Radar On/Off................2-3

2.4 Transmitting.....................................2-3

2.5 Stand-by...........................................2-3

2.6 Selecting the Range .........................2-4

2.7 Adjusting Picture Brilliance.............2-4

2.8 Adjusting Receiver Sensitivity ........2-4

2.9 Adjusting the A/C SEA Control

(reducing sea clutter).......................2-4

2.10 Adjusting the A/C RAIN Control

(reducing rain clutter)......................2-5

2.11 Selecting the Presentation Mode....2-6

2.12 Erasing the Heading Marker,

North Marker..................................2-6

2.13 Magnifying Long Range Echoes

(echo stretch)...................................2-6

2.14 Measuring the Range .....................2-7

2.15 Measuring the Bearing...................2-7

2.16 Using the Offset EBL ....................2-8

2.17 Shifting (off centering) the Picture 2-9

2.18 Zoom..............................................2-9

3. ADV ANCED OPERA TION

3.1 Basic Menu Operation .....................3-1

3.2 Index Lines ......................................3-1

3.3 Suppressing Radar Interference .......3-2

3.4 Selecting Pulsewidth........................3-2

3.5 Displaying Navigation Data ............3-3

3.6 Echo Trail.........................................3-4

3.7 Guard Alarm ....................................3-4

3.8 Watchman ........................................3-6

3.9 OTHER MENU Description............3-7

3.10 Function Keys................................3-8

3.11 Adjusting Brilliance of Markers ....3-8

3.12 Suppressing Second-Trace Echoes 3-8

3.13 Suppressing Noise .........................3-8

3.14 Outputting Target Position.............3-8

3.15 Tuning the Receiver.......................3-8

4. FALSE ECHOES

4.1 Multiple Echoes ...............................4-1

4.2 Side-lobe Echoes .............................4-1

4.3 Indirect Echoes ................................4-2

4.4 Blind and Shadow Sectors ...............4-2

5. MAINTENANCE & TROUBLESHOOTING

5.1 Preventative Maintenance................5-1

5.2 Replacing the Fuse...........................5-1

5.3 Troubleshooting ...............................5-2

5.4 Self Test ...........................................5-3

5.5 Life Expectancy of Magnetron ........5-3

6. ARP-10 (OPTION)

6.1 General.............................................6-2

6.2 Keys Used for Auto Plotter..............6-2

6.3 Activating the Auto Plotter ..............6-3

6.4 Manual Acquisition..........................6-4

6.5 Automatic Acquisition .....................6-4

6.6 Terminating Tracking of Targets......6-5

6.7 Displaying Target Data ....................6-5

6.8 Mode and Length of Vectors............6-6

SPECIFICATIONS ................ SP-1

INDEX .....................................IN-1

Declaration of Conformity

Page 9

MENU TREE

MENU KEY

RINGS (Off, 1, 2, 3, max) INDEX LINE (Off, On) DISP DATA (NAV, Auto plotter, NAV and Auto plotter) INT REJECT (Off, On) ARP-10 MENU OTHER MENU

Panel Dimmer (1, 2, 3, 4)

1. Mark Brill (1, 2, 3, 4)

2. HD Mark (1, 2, 3, 4)

3. Characters (1, 2, 3, 4)

4. Trail Tone (Single, Multi)

5. Pulselength (Short, Long)

6. Noise Reject (Off, On)

7. Trail Time

8. (15sec, 30sec, 1min, 3min, 6min, 15min, 30min, Cont) Tune (Auto, Manual)

9. WPT Mark (Off, On)

10. EBL Ref (Rel, True)

11. VRM Unit (nm, km, sm)†

12. Watchman (Off, 5min, 10min, 20min)

13. STBY Disp (Norm, Econo, Nav)

14. Guard Mode (In, Out)

15. Own Position (L/L, TD)

16. Cursor Posi (B/R, L/L)

17. Alm Sense LV (Low, Mid, High)

18. Dead Sector (Off, On)

19. Range

20. (1/8, 1/4, 1/2, 3/4, 1, 1.5, 2, 3, 4, 6, 8, 12, 16, 24, 36, 48, 64, 72, 96)* 2nd Rej (Off, On)

21. Self Test

22. Installation Setup

23.

1. Display

2. All Cancel

3. Vector Ref

4. Vector Length

5. History

6. CPA SET

7. TCPA SET

8. AUTO ACQ

(With ARP-10 only.)

= Default setting

*Maximum range FR-7062: 64 FR-7112: 72 FR-7252: 96

†: Not available on N-type radar.

vii

Page 10

SYSTEM CONFIGURATION

Scanner Unit

FR-7062 XN12A-RSB-0070-059 XN13A-RSB-0070-059 XN12A-RSB-0073-059

FR-7112 XN12A-RSB-0072-060 XN13A-RSB-0072-060 XN12A-RSB-0073-060

FR-7252 XN12A-RSB-0072-061 XN13A-RSB-0072-061 XN12A-RSB-0073-061

Navigation

IEC 1162* (In/Out)

device

Video Sounder

Gyro compass

*Equivalent to NMEA 0183

Option

†RU-1746B-2 is available for FR-7252 using XN12A (48 rpm) and XN13A.

# Available with 24 rpm antenna only.

IEC 1162* (In/Out)

Gyro Converter

AD-100

Integrated Heading

Sensor PG-1000

Display Unit

FR-7062/7112: RDP-122 FR-7252: RDP-123

Auto Plotter

ARP-10

FR-7062/7112: 12/24/32 VDC FR-7252: 24/32 VDC

Radar Plotter

Slave Display FMD-811/8010

External Alarm Buzzer OP03-21

CVD Converter

RP-6065B

Rectifier RU-3423, RU-1746B-2

115/230 VAC

1ø, 50/60 Hz

RP-110

Remote Display FMD-1800

†

viii

Page 11

1. PRINCIPLE OF OPERATION

1.1 What is Radar?

The term “RADAR” is an acronym meaning RAdio Detection And Ranging. Although the basic principles of radar were developed during World War II, echoes as an aid to navigation is not a new development.

1.2 How Ships Determined Position Before Radar

Before the invention of radar , when running in fog near a rugged shoreline, ships would sound a short blast on their whistles, fire a shot, or strike a bell. The time between the origination of the sound and the returning of the echo indicated how far the ship was from the cliffs or the shore. The direction from which the echo was heard indicated the relative bearing of the shore.

1.3 How Radar Determines Range

Radar determines the distance to the target by calculating the time difference between the transmission of a radar signal and the reception of the reflected echo. It is a known fact that radar waves travel at a nearly constant speed of 162,000 nautical miles per second. Therefore the time required for a transmitted signal to travel to the target and return as an echo to the source is a measure of the distance to the target. Note that the echo makes a complete round trip, but only half the time of travel is needed to determine the one-way distance to the target. This radar automatically takes this into account in making the range calculation.

1.4 How Radar Determines Bearing

The bearing to a target found by the radar is determined by the direction in which the radar scanner antenna is pointing when it emits an electronic pulse and then receives a returning echo. Each time the scanner rotates pulses are transmitted in the full 360 degree circle, each pulse at a slightly different bearing from the previous one. Therefore, if one knows the direction in which the signal is sent out, one knows the direction from which the echo must return.

1.5 Radar Wave Speed and Antenna Rotation Speed

Note that the speed of the radar waves out to the target and back again as echoes is extremely fast compared to the speed of rotation of the antenna. By the time radar echoes have returned to the scanner, the amount of scanner rotation after initial transmission of the radar pulse is extremely small.

1.6 The Radar Display

The range and bearing of a target are displayed on what is called a Plan Position Indicator (PPI). This display is essentially a polar diagram, with the transmitting ship’s position at the center. Images of target echoes are received and displayed at their relative bearings, and at their distance from the PPI center.

With a continuous display of the images of tar gets, the motion of the transmitting ship is also displayed.

1-1

Page 12

Targets

Heading marker

Range and bearing of a target, relative to own ship, are

readable on the PPI.

Own ship (radar)

(A) Bird's eye view of situation

Own ship in center

(B) Radar picture of (A)

Figure 1-1 How radar works

1-2

Page 13

2. BASIC OPERATION

POWER

F 1

F 2

BRILL

SHIFT

ZOOM

ECHO TRAIL

MODE

GUARD

ALARM

EBL

OFFSET

SELECT CANCEL

ACQ

ENTER

EBL 1 VRM 1

VRM 2

TLL

EBL 2

RANGE

OFF

ECONOMY

STBY

T X

GAIN

HM OFF(PUSH)

A/C SEA

A/C AUTO(PUSH)

ES(PUSH)

A/C RAIN

Turns power on. Press together with [STBY/TX] key to turn power off.

Alternates between stand-by and transmit.

NAV data and ARPA data can be displayed individually or together.*

Suppresses electrical noise.*

Selects radar range. Adjusts display brilliance.

(Long press) Doubles size of area between your vessel and location selected by cursor. (Short press) Shifts your vessel's position to cursor location.

(Control) Adjusts sensitivity of radar receiver. (Switch) Temporarily erases heading marker (and north marker if displayed).

(Control) Reduces sea clutter. (Switch) Automatically reduces sea and rain clutters.

(Control) Reduces rain clutters. (Switch) Enlarges echoes.

Selects presentation mode among HU, CU, NU, and TM.

Sets/cancels guard alarm; silences audible alarm.

Measures range and bearing between two targets; predicts collision course.

Turns corresponding VRM on/off.

Opens/closes menus.

Trackball (1) Shifts cursor, EBL and VRM. (2) Sets guard zone. (3) Selects items and options on

menu.

(4) Shifts origin of EBL and VRM.

Displays target movement in afterglow.

Turns corresponding EBL on/off. (Long press) Terminates plotting of

the target selected with cursor.† (Short press) Displays the data of target selected with the cursor.†

(1) Acquires the target selected with

the cursor.†

(2) Registers selection on menus.

* Default switch function. † Requires ARP-10 (option).

(Long press) Outputs target data position data to plotter. (Short press) Alternately displays cursor position display in lat/long or bearing/range. (Functuion is available when nav data is not displayed.)

2.1 Control Description

Figure 2-1 Control panel

2-1

Page 14

2.2 Display Indication and Markers

Echo trail elapsed time (P.3-4)

Heading (requires heading data)

Range (P.2-4)

Range ring interval (P.2-4)

Pulselength (P.2-4)

Display mode (P.2-6)

2nd-trace echo suppressor (P.3-8)

Guard zone area (P.3-4)

EBL1 (P.2-7)

VRM2 (P.2-7)

Heading marker (P.2-6)

0. 125

0. 0625 SP

HU RM

2ND ECHO

HDG 234.5°

TRAIL

25 : 38

AUTO

30min

G (OUT)

ZOOM

ES1

Tuning status (P.3-8)

Tuning bar (P.3-8)

Echo trail time (P.3-4)

Guard Zone (P.3-4)

Zoom (P.2-9) or Off center (P.2-9)

Echo Stretch (P.2-6)

EBL2 (P.2-7)

Range ring (P.2-7)

VRM1 (P.2-7)

Index lines (P.3-1)

Cursor (P.2-7)

A/C AUTO (P.2-5)

EBL1 bearing (P.2-8) EBL2 bearing (P.2-8)

A/C AUTO EBL/PI

345.6 R

23.0 R

Cursor bearing (P.2-8)

Cursor range (P.2-7)

Figure 2-2 Display indications

13.5 R

0.142NM

IR2

VRM

0.048NM

0.100NM

North marker (P.2-6)

Noise rejector (P.3-8)

Interference rejector (P.3-2)

VRM1 range (P.2-7) VRM2 range (P.2-7)

2-2

Page 15

2.3 Turning the Radar On/Off

2.5 Stand-by

Press the [POWER] key to turn the radar on. To turn the radar off, press the [POWER] key

together with the [STBY/TX] key. When the radar is turned on, the control panel

lights and a timer displays the time remaining for warm up of the magnetron (the device which produces radar pulses), counting down from 1:30 to 0:01 (2:00 to 0:01 for FR-7252).

2.4 Transmitting

After the power is turned on and the magnetron has warmed up, STBY (Stand-By) appears at the screen center. This means the radar is now fully operational.

Press the [STBY TX] key to transmit. When transmitting, any echoes from targets

appear on the display. This radar displays echoes in eight tones of green according to echo strength.

When you won’t be using the radar for an extended period, but you want to keep it in a state of readiness, place it in stand-by by pressing the [STBY/TX] key. The display shows “STBY,” (default setting) navigation data, or goes into the economy mode. (You can select stand-by condition on the menu. More on menu operation later.)

Economy mode

The CRT can be set to automatically turn itself off when in stand-by , to reduce power consumption. This feature is called the “economy mode”. When the economy mode is on, the “ECONOMY” indication under the [STBY/TX] key lights.

Navigation data display during stand-by

If a navigation aid inputs navigation data to this radar, navigation data can be displayed during stand-by. You can turn the navigation data display on/off through the menu. Figure 2-3 shows a typical navigation data display during standby.

Speed

Depth

TO Waypoint bearing

Time-to-go to TO Waypoint

Bearing to TO Waypoint

Range to TO Waypoint

SPEED

10.5

DEPTH TEMPERATURE

Heading

1.0

XTE

125

0.5

HDG

092.5°

CRS 180.0°M

WPT TTG 01:08

BRG

45.0° M

RNG

12.0NM

OWN SHIP

LAT 30°00.00N LON 135°00.00E

TD 36378.1

59096.4

XTE

R 0.3NM

TRIP

ST-BY

000.3 nm

+17.3

°C

XTE

0.5

: "M" is not displayed on N-type radar.

Time-to-go to Stand-by

Trip distance since power on

Temperature

Course

Ship's position in latitude and longitude and Loran TDs

Cross Track Error " " shows direction and amount of error.

1.0

Figure 2-3 Typical navigation data display

during stand-by

2-3

Page 16

Note 1:Availability of a particular display item

depends on incoming data.

Note 2:When Range to Waypoint reaches 0.1

nm, the WPT mark jumps to dead ahead even though a difference may exist between heading and BRG to WPT.

Note 3:When cross track error exceeds 1 nm

on either side, the XTE mark starts blinking.

2.6 Selecting the Range

2.8 Adjusting Receiver Sensitivity

The [GAIN] control adjusts the sensitivity of the receiver. It works in precisely the same manner as the volume control of a broadcast receiver, amplifying the signals received.

The proper setting is such that the background noise is just visible on the screen. If you set up for too little sensitivity, weak echoes may be missed. On the other hand excessive sensitivity yields too much background noise; strong targets may be missed because of the poor contrast between desired echoes and the background noise on the display.

The range selected automatically determines the range ring interval, the number of range rings, pulselength and pulse repetition rate, for optimal detection capability in short to long ranges.

You can select which ranges and pulselength (for 1.5 and 3 mile ranges) to use through the menu. The range, range ring interval and pulselength appear at the top left-hand corner of the display.

Selecting the range

Press the [- RANGE +] key . The range and range ring interval appear at the top left corner on the display .

Tips for selecting the range

¡ When navigating in or around crowded har-

bors, select a short range to watch for possible collision situations.

¡ If you select a lower range while on open

water, increase the range occasionally to watch for vessels that may be heading your way.

2.7 Adjusting Picture Brilliance

To adjust receiver sensitivity, transmit on long range, and adjust the [GAIN] control so background noise is just visible on the screen.

2.9 Adjusting the A/C SEA Control (reducing sea clutter)

Echoes from waves can be troublesome, covering the central part of the display with random signals known as “sea clutter”. The higher the waves, and the higher the antenna above the water, the further the clutter will extend. Sea clutter appears on the display as many small echoes which might affect radar performance. (See the left-hand figure in Figure 2-4.) When sea clutter masks the picture, adjust the A/C SEA control to reduce the clutter.

How the A/C SEA control works

The [A/C SEA] control reduces the amplification of echoes at short ranges (where clutter is the greatest) and progressively increases amplification as the range increases, so amplification will be normal at those ranges where there is no sea clutter.

The [BRILL] key adjusts the brilliance of the radar picture in sixteen levels.

Press the [BRILL] key to set the brilliance level. The current level momentarily appears on the screen.

2-4

Page 17

Adjusting the A/C SEA control

The proper setting of the A/C SEA should be such that the clutter is broken up into small dots, and small targets become distinguishable.

If the control is set too low, targets will be hidden in the clutter , while if it is set too high, both sea clutter and targets will disappear from the display. In most cases adjust the control until clutter has disappeared to leeward, but a little is still visible windward.

1. Confirm that the sensitivity is properly adjusted, and then transmit on short range.

2. Adjust the [A/C SEA] control so small targets are distinguishable but some clutter remains on the display.

2.10 Adjusting the A/C RAIN Control (reducing rain clutter)

The vertical beamwidth of the antenna is designed to see surface targets even when the ship is rolling. However, by this design the unit will also detect rain clutter (rain, snow , hail, etc.) in the same manner as normal targets. Figure 2-5 shows the appearance of rain clutter on the display .

Adjusting A/C RAIN

When rain clutter masks echoes, adjust the [A/ C RAIN] control. This control splits up these unwanted echoes into a speckled pattern, making recognition of solid targets easier.

Sea clutter at

display center

A/C SEA control adjusted;

sea clutter suppressed.

Figure 2-4 How to adjust the A/C SEA control

Tip for adjusting the A/C SEA

A common mistake is to over-adjust the circuit so all the clutter is removed. As an example set up for maximum A/C SEA. You will see how the center of the display becomes dark. This dark zone can be dangerous (targets may be missed), especially if the sensitivity is not properly adjusted. Always leave a little clutter visible on the display to be sure weak echoes will not be suppressed. If there is no clutter visible on the display, turn off the circuit.

CAUTION

Turn off the A/C SEA control when its use is not required; the control can erase weak targets.

Appearance of

rain clutter

A/C RAIN control adjusted;

rain clutter suppressed.

Figure 2-5 Effect of A/C RAIN

Note: In addition to reducing clutter, the [A/C

RAIN] control can be used in fine weather to clarify the picture when navi gating in confined waters. However, with the circuit activated the receiver is less sensitive. Therefore, turn off the circuit when its function is not required.

Automatic adjustments of A/C SEA and A/C RAIN

Push the [A/C SEA (A/C AUTO)] control. “A/ C AUTO” appears at the bottom left-hand corner of the display when the A/C AUTO circuit is on. You can fine tune by adjusting the [A/C SEA], [A/C RAIN] and [GAIN] controls.

2-5

Page 18

2.11 Selecting the Presentation Mode

This radar provides four presentation modes: head-up, course-up, north-up and true motion.

Press the [MODE] key.

ally mask a target. To view the target, you can temporarily erase the heading marker and north marker by pressing and holding down the [GAIN (HM OFF)] control. Release the control to re-display the markers.

W ith heading sensor connection, the display and the display mode indication at the top left-hand corner of the display change in the sequence of HU RM (Head-up), CU RM (Course-up), NU RM (North-up) and NU TM (True Motion) when the [MODE] key is pressed. If there is no heading sensor connection, the display mode is always HU RM.

Note: The radar begins operation with last

selected display mode (except Courseup) whenever the unit is turned on. Note however that Head-up is selected when Course-up was the last-used mode.

Head-up

The picture is oriented so the heading marker is at the top of the display. This mode is useful for navigation in congested waters.

Course-up

The Course-up mode shows ship’s heading by the heading marker , at the top of the display. T o get heading desired, steer vessel in direction desired, and then show “CU RM” at the top lefthand corner of the display.

North-up

Heading marker

North marker

Figure 2-6 Heading marker and north marker

2.13 Magnifying Long Range Echoes (echo stretch)

Normally, the reflected echoes from long range targets appear on the display as weaker and smaller blips even though they are compensated by the radar’s internal circuitry . The echo stretch function magnifies these small blips in all ranges. T wo types of echo stretch are available: ES1 which stretches echoes in bearing direction and ES2 which stretches them in both range and bearing directions.

To turn the echo stretch on or off, press the [A/C RAIN (ES)] control. Each press changes the echo stretch function in the sequence of ES1, ES2 and OFF. ES1 or ES2 appears at the top right-hand corner of display when echo stretch is on.

North is at the top of the display and the heading marker moves with ship’s heading. This mode is useful for determining ship’s position and as a navigation monitor on a nautical chart. The picture is stabilized against yaw of vessel, thereby reducing smear of target echoes. Bearing signal is required from a heading sensor.

True motion

True motion displays own ship and moving objects in their true motion. Bearing signal and speed signal are required from heading sensor and speed sensor.

2.12 Erasing the Heading Marker, North Marker

The heading marker or north marker (available with gyrocompass connection) may occasion-

2-6

Bearing direction

Echo stretch 1

Bearing direction

Range direction

Echo stretch 2

Figure 2-7 Echo stretch

Note1:This function magnifies not only targets

but also sea clutter and radar interference. For this reason be sure the controls for adjustment of sea clutter and radar interference are properly adjusted before activating the echo stretch.

Note 2: ES2 is not available on short ranges.

Page 19

2.14 Measuring the Range

You can measure the range to a target three ways: by the range rings, by the cursor, and by the VRM (Variable Range Marker).

Measuring range by range rings

Count the number of rings between the center of the display and the target. Check the range ring interval and judge the distance of the echo from the inner edge of the nearest ring.

T o turn the rings on or of f, see the menu operation later (Chapter 3).

Range

Range ring

interval

Target

Cursor

Cursor range

6.0 NM

2.0

4.0 NM

VRM

4.0 NM

3.0 NM

VRM1

VRM2

VRM1 range

VRM2 range

Measuring range by cursor

Operate the trackball to place the cursor intersection on the inside edge of the target echo, The range to the target, as well as the bearing, appears at the bottom of the display.

Measuring by VRM

1. Press either [VRM 1] or [VRM 2] key. The readout of the active marker is circumscribed.

EBL

345.6°R

23.0°R

VRM

5.3 NM

12.5 NM

Figure 2-8 Display bottom, showing location

of EBL and VRM readouts

2. Operate the trackball to place the outside edge of the VRM on the inside edge of the target. The trackball must be operated within five seconds after pressing a [VRM] key , otherwise the corresponding VRM cannot be operated. Press the [VRM] key again to adjust the VRM.

3. Check the VRM readout at the bottom righthand corner of the display to find the range to the target.

4. To anchor the VRM, press the [VRM] key again.

To erase the VRM, press and hold down the corresponding [VRM] key about two seconds.

Figure 2-9 Measuring range by the cursor

and VRM

Note: You can display the range readout of

the VRM and cursor in nautical miles, statute miles or kilometers. For details see the next chapter.

2.15 Measuring the Bearing

There are two ways to measure the bearing to a target: by the cursor, and by the EBL (Electronic Bearing Line).

Measuring bearing by cursor

Operate the trackball to bisect the target with the cursor intersection. The bearing to the target appears at the bottom of the display.

Measuring by EBL

1. Press the [EBL 1] or [EBL 2] key.

2. Operate the trackball to bisect the target with the EBL.

The trackball must be operated within five seconds after pressing an [EBL] key, otherwise the corresponding EBL cannot be oper ated. Press the [EBL] key again to adjust the EBL.

3. Check the EBL readout at the bottom lefthand corner of the display to find the bearing to the target.

4. To anchor the EBL, press the corresponding [EBL] key again.

T o erase the EBL and its readout, press and hold down the corresponding [EBL] key about two seconds.

2-7

Page 20

6.0 NM

2.0

Target

Cursor

EBL1

5. Operate the trackball to pass EBL1 through the center of the target.

If the target tracks along the EBL towards the center of the display (your vessel’s position), the target may be on a collision course.

EBL2

Cursor Bearing

EBL1 bearing EBL1 bearing

EBL

40.0° R

135.0° R

40.0°R 4.0 NM

Figure 2-10 How to measure bearing by EBL

and cursor

Note: The bearing readout for the EBL and

the cursor can be displayed in relative or true bearing (true bearing requires heading sensor input). For North-up and Course-up display modes the bearing reference is always true.

Tips for measuring bearing

¡ Bearing measurements of smaller targets are

more accurate; the center of larger target pips is not as easily identified.

¡ Bearings of stationary or slower moving tar-

gets are more accurate than bearings of faster moving targets.

¡ To minimize bearing errors keep echoes in

the outer half of the picture by changing the range scale; angular difference becomes difficult to resolve as a target approaches the center of the display.

T o cancel the offset EBL, press the [EBL OFFSET] key.

6.0 NM

2.0

EBL1 origin

(initial position

of target)

Target moved

here.

EBL1

bearing

EBL

70.0° R

VRM

6.0 NM

Offset EBL (EBL1)

VRM1 range

Figure 2-11 Predicting collision course by

using the offset EBL

Measuring range and bearing between two targets

The procedure which follows shows how to measure the range and bearing between target “A” and target “B” in Figure 2-12.

1. Operate the trackball to place the cursor on the center of target “A”.

2. Press the [EBL 1] key to turn on EBL1.

3. Press the [EBL OFFSET] key. EBL1’s origin shifts to cursor location.

2.16 Using the Offset EBL

The offset EBL provides two functions: predict collision course of radar target and measure the range and the bearing between two targets.

Predicting collision course

1. Operate the trackball to place the cursor on the center of the target.

2. Press the [EBL 1] key to turn on EBL1.

3. Press the [EBL OFFSET] key. EBL1’s origin shifts to cursor location.

4. After waiting several minutes, press the [EBL 1] key again.

2-8

4. Press the [EBL 1] key.

5. Operate the trackball to bisect target “B” with EBL1. Check the EBL1 readout to find the bearing between target “A” and target “B”.

6. Press the [VRM 1] key to turn on VRM1. Operate the trackball to place the outside edge of VRM1 on the inside edge of target “B”. Check the VRM readout to find the range between target “A” and target “B”.

Page 21

To cancel, press the [EBL OFFSET] key.

Cursor

Place cursor where desired.

Press [F1] to zoom.

Cursor

2.18 Zoom

EBL1

VRM1

VRM

VRM1 range

EBL1

bearing

70.0° R

4.5 NM

Figure 2-12 Measuring the range and bearing

between two targets by using the offset EBL

2.17 Shifting (off centering) the Picture

Y our vessel’ s position can be shifted up to 75% of the range in use to view the situation around your vessel without changing the range or size of targets.

The zoom feature allows you to double the size of the area between your vessel and any location within the current range to take a closer look at an area of interest.

1. Select location with the cursor.

2. Press and hold down the [SHIFT/ZOOM]

key about two seconds. ZOOM appears at the top right corner when the zoom function is on.

Figure 2-14 Zoom function

1. Operate the trackball to set cursor where desired.

2. Press the [SHIFT/ZOOM] key. OFFCENTER appears at the top right cor-

ner of the display when the picture is shifted.

Cursor Cursor

1 Place cursor

where desired.

2 Press SHIFT ZOOM

key to off center display.

Figure 2-13 Shifting the picture

Cancelling shifted picture

Press the [SHIFT/ZOOM] key again.

Note: Zoom is cancelled when range or

presentation mode is changed.

Cancelling zoom

Press the [SHIFT/ZOOM] key again.

2-9

Page 22

3. ADV ANCED OPERA TION

3.1 Basic Menu Operation

The menu mostly contains less-often used functions which once preset do not require regular adjustment. To open or close the menu, press the [MENU] key. You can select items on the menu with the trackball. The complete menu appears at begining of this manual.

1. Press the [MENU] key to display the main menu.

SSel by T-ball & press ENT.S

RINGS

Change brill from 3 to max.

INDEX LINE

DISP DATA

ARP-10 MENU

Figure 3-1 Main menu

2. Operate the trackball to select the item. For example, select RINGS. A message appears at the bottom of the menu window.

INT

REJECT

OTHER MENU

3.2 Index Lines

The index lines are useful for maintaining a constant distance between own ship and a coastline or partner ship. They are linked with EBL2 and VRM2.

EBL2

Index lines

Figure 3-3 Index lines

Turning the index lines on/off

1. Press the [MENU] key.

3. Press the [ACQ/ENTER] key to select setting. Each time this key is pressed, the message changes. For the RINGS menu, the message sequence is as shown below.

Change brill from Off to 1.

Change brill from 1 to 2.

Change brill from 2 to 3.

Change brill from 3 to max.

Change brill from max to Off.

Figure 3-2 Messages for RINGS menu

2. Select “INDEX LINE” by the trackball.

3. Select “Index Line on” by pressing the [ACQ/ENTER] key.

4. Press the [ACQ/ENTER] key to confirm.

5. Press the [MENU] key to close the menu.

“PI” indication appears next to EBL at the left bottom corner of the screen.

To turn the index lines off, select “Index Line off” and press the [ACQ/ENTER] key.

Rotating the index lines

1. Press the [EBL 2] key to activate EBL2.

2. Operate the trackball.

Adjusting the index lines interval

1. Press the [VRM 2] key to activate VRM2.

2. Operate the trackball.

4. Press the [MENU] key to close the menu.

3-1

Page 23

3.3 Suppressing Radar Interference

Radar interference may occur when near another shipborne radar operating in the same frequency band as your radar. Its on-screen appearance is many bright dots either scattered at random or in the form of dotted lines extending from the center to the edge of the display. Figure 3-4 illustrates interference in the from of curved spokes. Interference effects are distinguishable form normal echoes because they do not appear in the same place on successive rotations of the antenna.

3.4 Selecting Pulsewidth

Pulsewidth is the transmission time of a single radar pulse. The longer the pulsewidth the greater the direction range capability, however range accuracy and range resolution are reduced.

Pulsewidth can be selected to short or long on the 1.5 and 3 nautical mile ranges.

1. Press the [MENU] key.

2. Select “OTHER MENU” and press the [ACQ/ENTER] key.

Figure 3-4 Radar interference

Four levels of interference are available, including off; IR1, IR2, IR3 and OFF. IR3 provides the highest level of rejection.

1. Press the [MENU] key.

2. Select “INT REJECT” and press the [ACQ/ ENTER] key.

3. Select level desired by pressing the [ACQ/ ENTER] key.

4. Press the [MENU] key to close the menu.

Select item by T-ball

and press ENTER key.

1 . Panel Dimmer 2 . Mark Brill 3 . HD Mark 4 . Characters 5 . Trail Tone 6 . Pulselength 7 . Noise Reject 8 . Trail Time

9 . Tune

10. WPT Mark

11. EBL Ref

12. VRM Unit

13. Watchman

14. STBY Disp

15. Guard Mode

16. Own Position

17. Cursor Posi

18. Alm Sense LV

19. Dead Sector

20. Range

21. 2nd Rej

22. Self Test

23. Installation Setup

3min 6min 15min 30min Cont

†

4 6 8

[ OTHERS ]

1 1 1 1

Single

Short

Off 15sec

Auto Off Rel nm Off Norm In L/L R/B Low Off

1/8

1/4

Off

2 2 2 2 Multi

Long

On 30sec

Manual On True km 5min Econo Out TD L/L Med On

1/2

3 3 3 3

1min

sm 10min 20min Nav

Hig

3/4

1.5

24 36 48

4 4 4 4

20min

IR and level selected appears at the bottom right corner on the display when the interference rejection circuit is turned on.

3-2

†: Not displayed on N-type radar; VRM unit is fixed for nm.

*Max. range is; FR-7062: 64 FR-7112: 72 FR-7252: 96

Figure 3-5 OTHER MENU

3. Select “6. Pulselength” by operating the trackball.

4. Select Short or Long by operating the trackball.

5. Press the [ACQ/ENTER] key.

6. Press the [MENU] key to close the menu.

Page 24

3.5 Displaying Navigation Data

Navigation data can be displayed at the screen bottom if this radar receives navigation input in IEC 1162 format. Navigation data include;

¡ Position in latitude and longitude or Loran-

C time difference

¡ Range, bearing and time-to-go to both

waypoint selected on the navigator and the cursor

¡ Speed. (If the navigation input includes destination

data, waypoint position is denoted on the radar display by a dashed ring.)

To turn navigation data on or off

Press the [F1] key if its function is set for DISP DATA (default setting), or select DATA DISP on the menu.

0. 125

0.0625

HU RM

A/C AUTO EBL/PI

345.6 R

OWN SHIP 34° 56. 12N 135° 34. 56E SPD 35.0KT

23.0 R

HDG 234.5°

13.5 R° + CURSOR

34° 29. 98N 136° 35. 77E TTG 01:00

0.142NM

TRAIL

25:38

WAYPOINT

0.09 NM

50.0°M TTG 00:20

AUTO

30min

G (OUT)

ZOOM

ES1

VRM

0.048NM

0.100NM

Waypoint Mark

"M" is not displayed on N-type radar.

Navigation Data

Figure 3-6 Typical navigation data display

3-3

Page 25

3.6 Echo Trail

You can show the movement of all radar targets relative to your vessel in afterglow. This function is useful for alerting you to possible collision situations.

Changing trail attributes

Trail gradation and trail time can be selected on the OTHER MENU.

Table 3-1 Trailing attributes

Starting echo trail

Press the [ECHO TRAIL] key. TRAIL, the echo trail time selected (on

“OTHER MENU”) and elapsed time appear at the top right-hand corner of the display. Then, afterglow starts extending from all targets.

Figure 3-7 How the echo trail feature works

Note: Trails are restarted when range or

mode is changed or zoom or shift is turned on.

Fixed time trail

1. When the elapsed time clock counts up to the trail time selected, the elapsed time display freezes.

2. The oldest portions of trails are erased so only the latest trail, equal in length to the trail time selected, is shown.

3. Trail continues.

For example, the one minute trail time is selected. When the elapsed time clock counts up to 60 seconds, the elapsed time display freezes at “60,” but the latest one minute of trail is erased and then trail continues.

Continuous trail

The maximum continuous trail time is 99 minutes and 59 seconds. When the elapsed time clock counts up to that time the elapsed time display is reset to zero and trail begins again.

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3.7 Guard Alarm

The guard alarm allows the operator to set the desired range and bearing for a guard zone. When ships, islands, landmasses, etc. violate the guard zone an audible alarm sounds and the offending target blinks to call the operator’s attention.

Selection of guard zone type

The guard alarm can be set to sound when a target enters or exits the guard zone. You can select which type of guard alarm you want through the menu.

In alarm

The alarm sounds on targets entering the guard zone. “G (IN)” appears at the top right-hand corner when the In alarm is selected.

Out alarm

The alarm sounds on targets exiting the guard zone. “G (OUT)” appears at the top right-hand corner when the Out alarm is selected.

Cancelling echo trail

Press the [ECHO TRAIL] key again.

3-4

Page 26

Dashed line:

no alarm

Asterisk blinking

Guard zone

to set

D C

* G (IN)

Guard

zone

IN ALARM

OUT ALARM

Figure 3-8 In and Out alarm

Setting a guard zone

Preparation

1. Press the [MENU] key, and then select

“OTHER MENU,” and press the [ACQ/ENTER] key.

2. Select “15. Guard Mode” and “In” (alarm

on target entering zone) or “Out” (alarm on target exiting zone) by operating the trackball.

3. Press the [ACQ/ENTER] key.

4. Press the [MENU] key to close the menu.

To set a guard zone

1. Mentally create the guard zone you want to

set. For example, the guard zone shown in Figure 3-9 (1).

2. Operate the trackball to set the cursor on

point A or B. Press the [GUARD ALARM] key. “*G (IN)” or “*G (OUT)”, with asterisk blinking, appears at the top right-hand corner of the display . See Figure 3-9 (2). (The asterisk indicates the guard zone is partially set.)

3. Operate the trackball to set the cursor on

point C or D. See Figure 3-9 (3).

Drag cursor here.

Guard zone

(2) Drag cursor to

top left corner of zone and press [GUARD ALARM].

G (IN)

Drag cursor here.

(3) Drag cursor to

bottom right corner of zone and press [GUARD ALARM].

(1) Mentally create

the guard zone to set.

G (IN)

(4) Guard zone

completed.

Figure 3-9 How to set the guard zone

Silencing the audible alarm

Any radar targets violating the guard zone will trigger the audible alarm. You can silence the audible alarm by pressing the [GUARD ALARM] key. When this is done, “G(ACKN)” replaces “G(IN).” This means the alarm is acknowledged. Press the key again to reactivate the alarm.

Cancelling the guard zone and alarm

Press and hold down the [GUARD ALARM] key until the guard zone disappears.

4. Press the [GUARD ALARM] key. The as-

terisk disappears. See Figure 3-9 (4).

3-5

Page 27

Notes on the guard alarm

Turning on watchman

¡ The alarm is a useful anti-collision aid, but

does not relieve the operator of the responsibility to also keep a visual lookout for possible collision situations.

¡ When the radar range is less than one half of

the guard zone range, the guard zone disappears and “G (IN)” or “G (OUT)” appears in inverse video. If this happens, raise range to re-display the guard zone.

¡ A target echo does not always mean a land-

mass, reef, ships or surface objects but can imply returns from sea surface or precipitation. As the level of these returns varies with environment, the operator should properly adjust the A/C SEA, A/C RAIN and GAIN to be sure the alarm system does not overlook target echoes.

3.8 Watchman

The watchman function periodically transmits the radar for one minute to check for targets in a guard zone. If it finds change in the zone from the previous transmission the audible alarm sounds and the radar transmits continuously. This feature is useful when you do not need the radar’s function continuously but want to be alerted to radar targets in a specific area.

1. Create a guard zone (usually 360 degrees) with the guard alarm function.

2. Press the [MENU] key.

3. Select “OTHER MENU”.

4. Press the [ACQ/ENTER] key.

5. Select “13. Watchman”.

6. Operate the trackball to select watchman rest period; 5 minutes, 10 minutes or 20 minutes.

7. Press the [ACQ/ENTER] key.

8. Press the [MENU] key to close the menu.

“WATCHMAN” appears at the top of the screen, the radar transmits for one minute to check for targets inside the guard zone, and then the CRT shuts off and the radar goes into standby.

Cancelling watchman

Go into the “OTHER MENU” , and set “13. Watchman” for off.

Note 1:Watchman can be used without a guard

zone.

Note 2:The alarm sounds just before the radar

starts and stops transmitting.

1 min

Watchman starts.

St-by

5, 10 or 20 min

1 min

St-by

5, 10 or 20 min

Figure 3-10 How watchman works

How watchman works

When the time selected for the watchman rest period has elapsed, the radar automatically transmits for one minute to check the condition inside the guard zone. If there is no change, the radar goes into stand-by (“WATCHMAN” appears during stand-by.) If there is change, the radar sounds the audible alarm, cancels the watchman function and transmits continuously .

3-6

Page 28

3.9 OTHER MENU Description

The table below summarizes the OTHER MENU.

Table 3-2 OTHER MENU Description

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*: Level 1 and 2 are same brilliance while the menu is displayed. The brilliance changes after

the menu is erased.

†: Can not be selected on N-type radar; VRM unit is fixed for nm.

3-7

Page 29

3.10 Function Keys

The function keys (F1 and F2) work like the auto-dialing feature of a telephone, automatically executing the function assigned to them. The assigned function can be turned on/off by pressing appropriate function key again.

Default settings

F1: Display NAV/ARPA data F2: Noise rejector

How to program function keys

1. Press the [MENU] key.

2. Press [F1] or [F2] to open the function menu.

[ SETTING FOR F1 KNOB ]

SSel by T-ball & press ENT.S

Press MENU key to escape.

RINGS

NOISE REJECT

TUNE A/M

WATCH MAN

OTHER MENU

WPT MARK

DISP DATA

PULSE LENGTH

GUARD IN/OUT

PANEL DIMMER

EBL REF

OWN

POSITN

STBY DISP

TRAIL TIME

ALARM LEVEL

MARK BRILL

VRM UNIT

CURSOR

POSITN

INT

REJECT

TRAIL TONE

DEAD

SECTOR

CHARA CTERS

INDEX LINE

ARP-10 MENU

3.12 Suppressing Second-Trace

Echoes

In certain situations, echoes from very distant targets may appear as false echoes (second-trace echoes) on the screen. This occurs when the return echo is received one transmission cycle later, namely, after a next radar pulse has been transmitted. T o suppress them, select “2nd Rej On” on the OTHER MENU.

3.13 Suppressing Noise

Electrical noise can be suppressed by turning on “7. NOISE REJ” on the OTHER MENU.

This function is available by pressing the [F2] key (default setting).

3.14 Outputting Target Position

Target position data can be output to a plotter in IEC 1162 format. Press and hold down the [TLL] key to output the data. This function requires position data and heading signal.

3.15 Tuning the Receiver

The radar receiver can be tuned automatically or manually, and the default tuning method is automatic. In automatic tuning, the radar is automatically tuned everytime the radar is switched to “Tx” and the indication “TUNING” appears during tuning.

ARP-10 DISP

HIS TORY

ALL

CANCEL

COLLI SION

VECTOR LENGTH

AUTO ACQ

VECTOR REF

FNCTN

Figure 3-10 Function menu

3. Select function desired.

4. Press the [ACQ/ENTER] key.

5. Press the [MENU] key to close the menu.

3.11 Adjusting Brilliance of Markers

“2. Mark Brill” on the OTHER MENU adjusts the brilliance of markers such as the cursor.

The tuning bar at the top right-hand corner of the display shows tuning condition. Generally, the longer the tuning bar the better the tuning condition, however the length of the bar changes with number of radar echoes, range and other factors. Current tuning method is shown above the tuning bar as either “AUTO” or “MANUAL.”

For how to tune the receiver manually, see "9. Tune" on page 3-7.

Note: Automatic tuning may not work

properly if own ship’s radar receives the radar wave of another ship’s radar. If this is the case, the radar will be out of tune. Press the [STBY/TX] key twice to retune.

3-8

Page 30

4. FALSE ECHOES

Occasionally false echoes appear on the screen at positions where there is no target. In some cases the effects can be reduced or eliminated. The operator should familiarize himself or herself with the appearance and effects of these false echoes, so as not to confuse them with echoes from legitimate contacts.

4.1 Multiple Echoes

Multiple echoes occur when a short range, strong echo is received from a ship, bridge, or breakwater. A second, a third or more echoes may be observed on the display at double, triple or other multiples of the actual range of the target as shown in Figure 4-1. Multiple reflection echoes can be reduced and often removed by decreasing the sensitivity or properly adjusting the A/C SEA.

True echo

4.2 Side-lobe Echoes

Every time the antenna rotates, some radiation escapes on each side of the beam—called “side-lobes.” If a target exists where it can be detected by the side-lobes as well as the main-lobe, the side-lobe echoes may be represented on both sides of the true echo at the same range, as shown in Figure 4-2. Side-lobes show usually only at short ranges and from strong targets. They can be reduced through careful reduction of the sensitivity or proper adjustment of the A/C SEA.

Main-lobe

Side-lobe

Spurious target

Antenna

True echo

Own ship

Figure 4-2 Side-lobe echoes

Multiple echo

Figure 4-1 Multiple echoes

4-1

Page 31

4.3 Indirect Echoes

4.4 Blind and Shadow Sectors

Indirect echoes may be returned from either a passing ship or returned from a reflecting surface on your own ship, for example, a stack. In both cases, the echo will return from a legitimate contact to the antenna by the same indirect path. The echo will appear on the same bearing of the reflected surface, but at the same range as the direct echo. Figure 4-3 illustrates the effect of an indirect echo. Indirect echoes may be recognized as follows:

• they usually occur in a shadow sector

• they appear on the bearing of the obstruction but at the range of the legitimate contact

• when plotted, their movements are usually abnormal, and

• their shapes may indicate they are not direct echoes.

Direct path

Target

Heading line

Funnels, stacks, masts, or derricks in the path of antenna may reduce the intensity of the radar beam. If the angle subtended at the antenna is more than a few degrees a blind sector may be produced. Within the blind sector small targets at close range may not be detected while larger targets at much greater ranges may be detected. See Figure 4-4.

Vessel taller than wharf

Wharf

Blind sector (no echo)

Mast, etc. in path of radar beam

Size of blind sector depends on target size and range.

Figure 4-4 Blind and shadow sectors

Indirect path

Obstruction

Antenna

Target

Bridge

Indirect echo

(mast, funnel. etc.)

Direct path

Own ship

True echo

Figure 4-3 Indirect echoes

Indirect echo

Heading line

Indirect echo

True echo

4-2

Page 32

5. MAINTENANCE & TROUBLESHOOTING

This chapter tells you how to keep your radar in good working order. Before reviewing this chapter please read the safety information which follows.

DANGER

Turn off the power before performing any maintenance or troubleshooting procedure.

Hazardous voltages can shock, burn or cause death. Only qualified personnel totally famillier with electrical circuits should work inside the units.

RF RADIATION HAZARD

The radar scanner emits high frequency radio radiation which can be harmful, particularly to your eyes.

Never look directly into the scanner from a distance of less than two feet when the radar is in operation as you could injure the cornea of your eyes. Always make sure the radar is set to stand-by or is turned off before starting work on the scanner unit.

A maintenance program should be established and should at least include the items listed in T able 5-

5.2 Replacing the Fuse

The fuse in the fuse holder at the back of the display unit protects the equipment against reverse polarity of ship's mains, overcurrent, and equipment fault. If the fuse blows, find the cause before replacing it. Never use an incorrect fuse serious damage to the equipment may result and void the warranty.

FR-7062/7112 is shipped with a 15 A fuse for 12V ship's mains. If the ship's mains is 24/32V , change the fuse to 10 A (supplied).

FR-7252 is supplied with a 10A fuse for 24/32 V ship's mains.

5.1 Preventive Maintenance

Regular maintenance is important for good performance. Always keep the equipment as free as possible from dirt, dust, and water splashes. Make sure all screws securing the components are properly tightened.

Table 5-1 Recommended maintenance program

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6ot3

shtnom

desopxE dnastun

nostlob

tinurennacs

.dedorroc

rennacS

rotaidar

CAUTION

Use the proper fuse.

Use of a wrong fuse can result in equipment damage.

denesoolrodedorrocrofkcehC

,yrassecenfI.stlobdnastun

.ylkcihtmehttniaperdnanaelc

ylivaehfimehtecalpeR

.erutuf

noskcarcdnatridrofkcehC

dluohstridkcihT.ecafrusrotaidar

htolctfoshtiwffodepiweb

afI.retawhserfhtiwdenepmad

thgilsaylppa,dnuofsikcarc

rodnuopmocgnilaesfotnuoma

yraropmetasaevisehda

.riaperrofllacneht,ydemer

morfecievomerotdeenrennacs

suoiresgnisuac,ssergni

desuebyamdnuopmocgnilaeS

llamsaylppA.tniapfodaetsni

stunneewtebesaergfotnuoma

nilavomerysaerofstlobdna

tnevloscitsalpesutonoD

uoyfI.gninaelcrof)enoteca(

roremmahnedoowaesu,tinu nokcarC.remmahdaehcitsalp

retawesuacyamtinueht

.stiucriclanretniotsegamad

shtnom6 raey1ot

tinuyalpsiD

srotcennoc

.noisorroc

dnanoitcennocthgitrofkcehC

.tnemecalperrof

relaedruoytcatnoc,dedorrocfI

5-1

Page 33

5.3 Troubleshooting

Table 5-2 contains simple troubleshooting procedures which you can follow to try to restore normal operation. If you cannot restore normal operation, do not attempt to check inside any unit of the radar system. Any repair work is best left to a qualified technician.

Table 5-2 Troubleshooting table

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ehtdesserpuoy

nrutotyek]REWOP[

radarehtno

sahradareht

uoydnapudemraw

ehtdesserp

otyek]XTYBTS[

timsnart

detsujdaevahuoy

C/Ahtiwniageht

AESC/AdnaNIAR

ffo

thgilton

roopsitsartnoc

erasretcarahc

detrotsid

etator

dnasretcarahc

erasnoitacidni

lamronba

raeppastegrat

dnasnoitacidni(

)odsrekram

)odstegratdna

seodlenaplortnoceht

.elbacrewopniesufkcehc•

nosraeppagnihton

yalpsidroyalpsideht

.ecivrestseuqer•

tonseodrennacseht

.ecivrestseuqeR

.tes

ronesionrehtien

ronsnoitacidnirehtien esion(raeppasrekram

.ecnaillirbehtgnitsujdayrt•

niebyammelborpeht•rennacs.tinu

-kcablenaplortnocehtgnitsujdayrt•

.unemSREHTOehtnognithgil

.degrahcsidevahyamyrettab•

ehtkcehcnaicinhcetdeifilauqaevah•

.egamadrofelbaclangiskcehc•

5-2

enillaidar(peewseht

ehtdnuoragnipeews

tonsi)yalpsid

htiwdezinorhcnys

rennacsnoitator

niegnahconsiereht

ytivitisnes

desserpsiyekasneppahgnihton.ecivrestseuqeR.ytluafebyamyek•

ehtniebyammelborpeht•rennacs

.ecivrestseuqeR.tinu

.ecivrestseuqer•

Page 34

5.4 Self Test

The self test facility checks the keyboard, ROM and RAM for proper operation.

1. Press the [MENU] key.

2. Select “OTHER MENU”.

3. Select “22. Self Test” and press the [ACQ/

ENTER] key . The following display appears.

[Self Test]

Key test: Press each key and check on-screen indication lights.

ARP-10 TEST ROM OK 18590271xx RAM OK SPEED OK NAV 0.0KT COURSE OK 167.6° TRIGGER NG VIDEO NG BP OK HP OK MIN-HIT 0003 SCAN-TIME 0854 MAN-ACQ 00 AUTO-ACQ 00 FE-DATA1 0000 FE-DATA2 0000

6. Press the [ACQ/ENTER] key to check the

display circuit. The following pattern should appear.

Figure 5-2 Test pattern

7. To return to the Self Test menu, press the [MENU] key.

8. To escape from the self test, press the [MENU] key.

5.5 Life Expectancy of

Program No. ROM RAM Hours in use Tx hours

: 0359146-1xx : OK : OK : 000006.9H : 000001.1H

Figure 5-1 Self test screen

4. The ROM and RAM are automatically checked. If NG (No Good) appears to the right of ROM or RAM indication, contact your dealer for advice. ARP-10 TEST results appear only when optional ARP-10 board is mounted.

5. To check the keyboard, press any key except [ACQ/ENTER] and [POWER] keys. The pressed key's on-screen location lights in black while the key is pressed, if the key is operating properly.

Magnetron

The following table shows the life expectancy of the magnetrons.

Table 5-3 Life expectancy of magnetrons

ledoMepyT.onedoCycnatcepxeefiL

2607-RF

2117-RF

2527-RF

0653E050-931-000

9835GM641-531-000 1425GM630-001-000

6653E–

8541M443-041-000

6345GM267-041-000

sruoh000,3-000,2

)yb-dnatsgnidulcnI(

5-3

Page 35

6. ARP-10 (OPTION)

WARNING

No one navigational aid should be relied upon for the safety of vessel and crew. The navigator has the responsibility to check all aids available to confirm position. Electronic aids are not a substitute for basic navigational principles and common sense.

• This auto plotter automatically tracks an automatically or manually acquired radar target and calculates its course and speed, indicating them by a vector. Since the data generated by the auto plotter are based on what radar targets are selected, the radar must always be optimally tuned for use with the auto plotter, to ensure required targets will not be lost or unwanted targets such as sea returns and noise will not be acquired and tracked.

• A target does not always mean a land mass, reef, ships or other surface vessels but can imply returns from sea surface and clutter. As the level of clutter changes with environment, the operator should properly adjust the A/C SEA, A/C RAIN and GAIN controls to be sure target echoes are not eliminated from the radar screen.

CAUTION

The plotting accuracy and response of this auto plotter meets IMO standards. Tracking accuracy is affected by the following:

• Tracking accuracy is affected by course change. One to two minutes is required to restore vectors to full accuracy after an abrupt course change. (The actual amount depends on gyrocompass specifications.)

• The amount of tracking delay is inversely proportional to the relative speed of the target. Delay is on the order of 15—30 seconds for high relative speed; 30—60 seconds for low relative speed.

Display accuracy is affected by the following:

• Echo intensity

• Radar transmission pulsewidth

• Radar bearing error

• Gyrocompass error

• Course change (own ship or target)

6-1

Page 36

6.1 General

6.2 Keys Used for Auto Plotter

The Auto Plotter ARP-10 is an optional circuit board which is accommodated in the display unit of the FR-7062 radar.

The Auto Plotter permits manual or automatic acquisition and automatic tracking of up to 10 radar targets. An internal microprocessor calculate target data such as speed and course and displays the results in alphanumeric and by vectors. To ensure the reliability of the displayed target data, the radar must be properly adjusted for minimum sea returns and noise.

Principal specifications

Acquisition and tracking

• Acquisition of up to 10 targets between 0.2

and 16 nm.

• Automatic tracking of up to 10 acquired tar-

gets between 0.1 and 16 nm.

Vectors

Vector length: 30 s, 1, 3, 6, 15, 30 min. Orientation: True velocity or relative velocity

Past positions

5 past positions at intervals of 15, 30 s, 1, 2, 3, 6 min.

The Auto plotter utilizes the following touchpad keys. Given below is a brief description of these keys.

MENU:

Displays/Erases the main menu.

SELECT/CANCEL:

(Long press) Terminates plotting of the target selected with the cursor.

(Short press) Displays the data of target selected with the cursor.

ACQ/ENTER:

Acquires the target selected with the cursor.

ARP-10 MENU operation

The ARP-10 MENU includes the followings:

Display:

Turns on/off the plot symbols, past positions and target data.

All Cancel:

Cancels the tracking of all targets.

Vector Ref:

Selects relative vector or true vectors.

Alarm

Visual and audible alarms against targets violating CPA/TCPA limits; visual alarm against lost targets.

Target discrimination

A target measuring about 800 m or more in the radial or circumferential direction is regarded as a landmass and not acquired or tracked. Echoes smaller than about 800 m are regarded as true targets.

NOTICE

Heading data required for plotting function.

Vector Length:

Selects vector time.

History:

Selects past position plot interval.

CPA Set:

Selects CPA alarm limit. When a target is predicted to come within this limit, an aural alarm sounds and at the same time the corresponding target symbol changes to a blinking triangle.

Note: If the preset CPA limit is set at OFF, a target which is on collision course will not produce an alarm.

TCPA Set:

Selects TCPA alarm limit.

Auto ACQ:

Turns on/off Auto Acquisition Area.

6-2

Page 37

6.3 Activating the Auto Plotter

T o activate the ARP-10, follow the steps shown below .

1. Adjust the GAIN, A/C SEA and A/C RAIN

controls for proper radar picture.

2. Press the [MENU] key to open the main

menu.

3. Operate the trackball to select “ARP-10

MENU”.

4. Press the [ACQ/ENTER] key. The menu

shown in Figure 6-1 appears.

and press ENTER key.

1 . Display 2 . All Cancel 3 . Vector Ref 4 . Vector Length

5 . History

6 . CPA Set

7 . TCPA Set

8 . Auto ACQ

[ ARP MENU ]

Select item by T-ball

Off

Rel

3min 6min

Off 15sec

2min 3min

Off 0.5nm

3nm 5nm

30sec 1min

4min 5min

Off

True

30sec

15min 30sec 6min 1nm 6nm 2min 6min On

1min

30min

1min

2nm

3min 12min

5. Operate the trackball to select the menu item “1. Display”.

6. Operate the trackball to select “On”.

7. Press the [ACQ/ENTER] key.

8. Press the [MENU] key to close the menu.

Target is being tracked but is not selected for data readout

HDG 234.5

Target Full Mark

Lost Target

AUTO TARGET

FULL

SP HU RM

Figure 6-1 ARP menu

AUTO

TRAIL

25:38

30min

G (OUT)

ZOOM

ES1

Threatening target

Target selected for data reading (large square)

Auto Acquisition Area

A/C AUTO EBL/PI

345.6

23.0

TRUE VECTOR 15 MIN

13.5

BEARING 42.5°T RANGE 5.36 NM CPA 2 NM

0.142NM

0.048NM

0.100NM

COURSE 287.8°T SPEED 12.5 KT TCPA 12:35

Figure 6-2 ARP display

VRM

ARPA Data Area

6-3

Page 38

Deactivating the auto plotter

1. Press the [MENU] key.

2. Open the “ARP-10 MENU”.

3. Operate the trackball to select the “1. Display”.

Note 3: When auto acquisition mode (Auto ACQ) is on, up to five targets can be acquired. For details, see 6.5 Automatic Acquision.

WARNING

4. Operate the trackball to select “Off”.

5. Press the [ACQ/ENTER] key.

6. Press the [MENU] key to close the menu.

6.4 Manual Acquisition

Follow the steps below to manually acquire a target. Up to 10 targets can be manually acquired.

1. Place the cursor (+) on a target of interest by operating the trackball.

2. Press the [ACQ/ENTER] key.

The plot symbol changes its shape according to the status as below. A vector appears in about one minute after acquisition indicating the target’ s motion trend. If the target is consistently detected for three minutes, the plot symbol changes to a solid mark. If acquisition fails, the target symbol blinks and disappears shortly.

When a tracked target nears another tracked target, the targets may be "swapped." When two targets come close to each other, one of the two can become a "lost target." Should this happen, reacquisition of the "lost target" is required after the two targets have separated.

6.5 Automatic Acquisition

The ARP-10 can acquire up to five targets automatically by setting the Auto Acquisition area predefined in the system. If Auto ACQ is selected after more than five targets have been manually acquired, only the remaining capacity of targets can be automatically are acquired. For example; when seven targets acquired manually, then the Auto ACQ is switched on, only three targets can be acquire automatically . When five targets have been automatically acquired, “AUTO TARGET FULL” message appears at top left corner seven on the display.

SQUARE (dotted)

Immediately after acquisition - Plot symbol shown in broken lines.

SQUARE (dotted with a vector)

One minute after acquisition - Vector still unreliable.

CIRCLE (Solid with a vector)

3 minutes after acquisition - Plot symbol changes to a solid circle indicating the stable tracking condition.

LARGE SQUARE

The plot symbol of a target being tracked becomes twice as large as the normal symbol when the target is selected for data reading.

Note 1: The target to be acquired should be within 0.2 to 16 nm from own ship and not obscured by sea or rain clutter.

Note 2: When you want to acquire 1 1th target, cancel tracking one of less important targets.

Setting auto acquisition area

Auto acquisition area is predefined between 2.0 and 2.5 nm in range and 45º on either side of the heading maker in bearing. If a target comes into this area, it is acquired automatically.

Figure 6-4 Auto acquisition area

Follow the steps below to activate the auto acquisition area.

1. Open the “ARP-10 MENU”.

2. Select “8. Auto ACQ” by operating the trackball.

3. Operate the trackball to select “On”.

4. Press the [ACQ/ENTER] key.

6-4

5. Press the [MENU] key to close the menu.

Page 39

6.6 Terminating Tracking of Targets

When the ARP-10 has acquired 10 targets, no more acquisition occurs unless targets are lost. Should this happen, cancel tracking of individual targets or all targets by the procedure described below.

Individual targets

Place the cursor (+) on the target which you do not want to be tracked any longer by operating the trackball and press and hold down the [SELECT/CANCEL] key.

All targets

Tracking of all tar gets can be canceled from the ARP-10 MENU.

1. Open the “ARP-10 MENU”.

Place the cursor on a wanted target and press the [SELECT/CANCEL] key. Data on the selected target is displayed at the bottom of the screen. The symbol of the selected target gets twice as large as the normal circle. The data includes the following;

RNG/BRG (Range/Bearing): Range and bearing from own ship to the last-plotted or selected target position with suffix “T” (True) or “M” (Magnetic). For true bearings suffix “T” is used in case of gyrocompass input and suffix “M” is used in case of magnetic compass input.

2. Select “2. All Cancel”.

3. Press the [ACQ/ENTER] key.

6.7 Displaying Target Data

The ARP-10 calculates motion trends (range, bearing, course, speed, CPA and TCPA) of all targets being tracked at the ARPA Data area.

To turn ARPA data on;

1. Press the [MENU] key.

2. Select the “DISP DATA”.

3. Press the [ACQ/ENTER] key to select the

message for “ARP” or “NAV and ARP”.

4. Press the [ACQ/ENTER] key to set.

5. Press the [MENU] key to close the menu.

Note: “M” is not displayed on N-type radar.

COURSE/SPEED (Course/Speed): Course and speed are displayed for the last-plotted or selected target with suffix “T” (True) or “M” (Magnetic). For true bearings suffix “T” is used in case of gyrocompass input and suffix “M” is used in case of magnetic compass input.

Note: “M” is not displayed on N-type radar.

CPA (Closest Point of Approach): The closest range a target will approach to own ship. Do not confuse it with the operator preset CPA alarm limit.

TCPA: The time to CP A measured with present speeds of own ship and the targets. Both CPA and TCPA are automatically calculated. When a target ship has passed clear of own ship, the CPA is displayed and the TCPA appears as “**.*”. TCPA is counted up to 99.9 min. and beyond this it is indicated as TCPA>99.9 min.

6-5

Page 40

6.8 Mode and Length of Vectors

True or relative vector

Target vectors are displayed in relative or true mode. Own ship does not have a vector in relative mode.

Vector length

From the ARP-10 MENU, Vector Length can be set to 30 seconds, 1, 3, 6, 15 or 30 minutes and the selected vector time is indicated on the screen.

The vector tip shows an estimated position of the target after the selected vector time elapses. It can be valuable to extend the vector length to evaluate the risk of collision with any target.

Past position display

The ARP-10 displays equally time-spaced dots (maximum 5 dots) marking the past positions of any targets being tracked.

If a target changes its speed, the spacing will be uneven. If it changes course, its plotted course will not be a straight line in TM mode.

Operational warnings

There are two main situations which cause the ARP-10 to trigger visual and audible alarms:

• CPA/TCPA alarm

• Lost target alarm

CPA/TCPA alarm

Visual and audible alarms are generated when the predicted CPA and TCPA of any target become less than their preset limits. The audible alarm continues for 10 seconds.

The ARP-10 continuously monitors the predicted range at the Closest Point of Approach (CPA) and predicted time to CPA (TCPA) of each tracked target to own ship.

When the predicted CP A of any tar get becomes smaller than a preset CPA alarm range and its predicted TCPA less than a preset TCPA alarm limit, the ARP-10 releases an audible alarm. In addition, the target plot symbol changes to a triangle and flashes together with its vector.

Provided that this feature is used correctly, it will help prevent the risk of collision by alerting you to threatening targets. It is important that GAIN, A/C SEA, A/C RAIN and other radar controls are properly adjusted and the ARP10 is set up so that it can track targets effectively .

CPA/TCPA alarm ranges must be set up properly taking into consideration the size, tonnage, speed, turning performance and other characteristics of own ship.

Follow the steps shown below to set the CPA/ TCPA alarm ranges:

1. Open the “ARP-10 MENU”.

2. On the “CPA Set” line, select a CPA limit desired. (Off, 0.5, 1, 2, 3, 5, 6 nm)

3. Press the [ACQ/ENTER] key.

4. On the “TCP A Set” line, select a TCP A limit desired. (30s, 1, 2, 3, 4, 5, 6, 12M)

5. Press the [ACQ/ENTER] key.

6. Press the [MENU] key to close the menu.

The flashing of the triangle plot symbol and vector remains on the screen until the dangerous situation is no longer present or you intentionally terminate tracking of the target by using the [SELECT/CANCEL] key.

Lost target alarm

When the system detects a loss of a tracked target, the target symbol becomes a flashing diamond.

6-6

Page 41

SPECIFICATIONS OF MARINE RADAR

FR-7062/7112/7252

1. GENERAL

(1) Indication System PPI Daylight display, raster scan, 8 tones in monochrome (2) Range, Pulselength (PL) & Pulse Repetition Rate (PRR)

(range max. FR-7062: 64 nm, FR-7112: 72 nm, FR-7252: 96 nm)

Range (nautical miles) PL PRR 0.125 0.25 0.5 0.75 1 1.5 2 3 4 6 8 12 16 24 36 48 64 72 96 SP 2100 Hz 0.08 µs MP 1200 Hz 0.3 µs LP 600 Hz* 0.8 µs

*550 Hz on 48 nm to 72 nm range, or 500 Hz on 96 nm range

(3) Range Resolution Better than 20 m (4) Bearing Discrimination XN12A: within 1.9º, XN13A: within 1.2º (5) Minimum Range 25 m (0.25 NM range) (6) Bearing Accuracy Within 1º (7) Range Ring Accuracy 0.9 % of range or 8 m, whichever is the greater

2. SCANNER UNIT

(1) Radiator Slotted waveguide array (2) Polarization Horizontal (3) Antenna Rotation Speed 24 rpm nominal: XN12A (100 kt max.), XN13A (100 kt max.) 48 rpm nominal: XN12A (70 kt max.) (4) Radiator Length XN12A:120 cm, XN13A: 180 cm (5) Horizontal Beamwidth XN12A: 1.9°, XN13A: 1.2° (6) Vertical Beamwidth 22° (7) Sidelobe Attenuation

XN12A: Within ±20° of main-lobe: less than -24 dB Outside ±20° of main-lobe: less than -30 dB XN13A: Within ±10° of main-lobe: less than -24 dB Outside ±10° of main-lobe: less than -30 dB

3. TRANSCEIVER MODULE

(1) Frequency 9410 MHz ±30MHz (X band) (2) Modulation P0N (3) Peak Output Power FR-7062: 6 kW, FR-7112: 12 kW, FR-7252: 25 kW (4) Modulator FET Switching Method

SP - 1

Page 42

(5) Intermediate Frequency 60 MHz (6) Tuning Automatic or manual

(for manual, select manual tuning on menu and tune by trackball)

(7) Receiver Front End MIC (Microwave IC) (8) Bandwidth Tx pulselength 0.08 s and 0.3 s: 25 MHz

Tx pulselength 0.8 s: 3 MHz

(9) Duplexer Circulator with diode limiter

4. DISPLAY UNIT

(1) Indication System PPI Daylight display, raster scan, 8 colors (2) Picture Tube 12 inch rectangular (184 mm x 245 mm) monochrome CRT

effective display area more than 180 mm

(3) Range, Range Interval, Number of Rings

(range max. FR-7062: 64 nm, FR-7112: 72 nm, FR-7252: 96 nm)

Range (NM) 0.125 0.25 0.5 0.75 1 1.5 2 3 4 6 8 12 16 24 36 48 64 72 96 Ring Interval (NM) 0.0625 0.125 0.125 0.25 0.25 0.5 0.5 1 1 2 2 3 4 6 12 12 16 18 24 Number of Rings 2 2 4 3 4 3 4 3 4 3 4 4 4 4 3 4 4 4 4

(4) Markers Heading Line, Bearing Scale, Range Rings,

Variable Range Marker (VRM1, VRM2), Electronic Bearing Line (EBL1, EBL2), Tuning Bar, Cursor, Parallel Cursor, Alarm Zone, Waypoint Mark (navigation input required), North Mark (heading sensor input required)

(5) Alphanumeric Indications Range, Range Ring Interval, Pulselength(SP, MP, LP),

Display Mode(HU, CU, NU, TM),

Interference Rejection(IR1, IR2, IR3),

Variable Range Marker(VRM1, VRM2), Electronic Bearing Line (EBL1, EBL2), Automatic A/C SEA (A/C AUTO), Stand-by (ST-BY), Radar Alarm (G(IN), G(OUT), G(ACKN)), Echo Stretch (ES1, ES2), Cursor Range, Bearing or L/L Position, Echo Tailing (TRAIL), Trailing Time, Trailing Elapsed Time, Navigation Data(navigation input required), Heading (HDC, heading sensor input required)

(6) Input Data NMEA0183 (Ver.1.5/2.0), current loop

Own ship’s position: GGA>RMC>RMA>GLL (GLL is available Ver.1.5 only)

Speed: RMC>RMA>VTG>VHW

Heading (True): HDT>HDG*1>HDM*1>VHW>VHW

SP - 2

Page 43

Heading (Magnetic): HDM>HDG

>HDT*1>VHW>VHW*1 Course (True): RMC>RMA>VTG Course (Magnetic): VTG>RMC>RMA Waypoint(Range, Bearing): RMB>BWC>BWR Loran time difference: RMA>GLC>GTD Water depth: DPT>DBT>DBK>DBS Water temperature: MTW>MDA Time: ZDA XTE: RMB>XTE>APB *1: calculate by magnetic drift.

(7) Output Data NMEA0183(Ver.1.5/2.0), RS-422

TLL (target data) and RSD

5. ENVIRONMENTAL CONDITI ON

(1) Ambient Temperature Scanner Unit: -25°C to +70°C Display Unit: -15°C to +55°C (2) Relative Humidity 95 % or less at +40°C (3) Waterproofing

Scanner Unit IPX6 Display Unit Chassis: not specified Panel: IPX4

6. POWER SUPPLY & POW ER CONSUMPTION

(1) Power Supply FR-7062/7112: 12/24/32 VDC (10.8 to 41.6 VDC)

FR-7252: 24/32 VDC (21.6 to 41.6 VDC)

(2) Voltage and Current

FR-7062 XN12A(24rpm): 12 VDC/7.5A, 24VDC/3.8A, 32VDC/2.8A XN12A(48rpm): 12 VDC/8.8A, 24VDC/4.4A, 32VDC/3.3A XN13A(24rpm): 12VDC/10A, 24VDC/5A, 32VDC/3.8A FR-7112 XN12A(24rpm): 12 VDC/8.3A, 24VDC/4.2A, 32VDC/3.1A XN12A(48rpm): 12 VDC/10A, 24VDC/5A, 32VDC/3.8A XN13A(24rpm): 12 VDC/10.8A, 24VDC/5.4A, 32VDC/4.1A FR-7252 XN12A(24rpm): 24VDC/5.2A, 32VDC/3.9A XN12A(48rpm): 24VDC/5.8A, 32VDC/4.4A XN13A(24rpm): 24VDC/6.3A, 32VDC/4.7A

(3) Power Consumption

FR-7062 XN12A(24rpm): 70 W to 90 W(100 kt) XN12A(48rpm): 85 W to 105 W(70 kt)

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XN13A(24rpm): 80 W to 120 W(100 kt)

FR-7112 XN12A(24rpm): 85 W to 100 W(100 kt)

XN12A(48rpm): 95 W to 120 W(70 kt) XN13A(24rpm): 90 W to 130 W(100 kt)

FR-7252 XN12A(24rpm): 105 W to 125 W(100 kt)

XN12A(48rpm): 120 W to 140 W(70 kt) XN13A(24rpm): 115 W to 150 W(100 kt)

7. DIMENSIONS AND MASS

See Outline Drawings

8. CORTING COLOR (1) Display Unit Panel: N3.0

Chassis: 2.5GY5/1.5

(2) Scanner Unit N9.5

9. COMPASS SAFE DISTANCE

(1) Display Unit Standard: 1.1 m Steering: 0.8 m (2) Scanner Unit

FR-7062/7112 Standard: 1.0 m Steering: 0.8 m FR-7252 Standard: 1.7 m Steering: 1.3 m

10. ARP MODULE (OPTION)

(1) Acquisition Range 0.2 to 16 NM (2) Tracking Range 0.1 to 16 NM (3) Maximum Number of Target 10 (4) Acquisition Time Within 5 sec (scanner rotation: 24 rpm) (5) Alarm Timing Lost target (blink mark, collision alert) (6) Vector Length 30 sec; 1, 3, 6, 15 or 30 min (selected on menu) (7) Plotting Interval 15, 30 sec; 1, 2, 3 or 6 min (selected on menu) (8) Numeric Data Indication Distance, Bearing, Course, Speed, CPA, TCPA (9) Acquisition Available Speed 100 kt relative

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Index

Acquisition............................................... 6-4

A/C RAIN................................................ 2-5

A/C SEA................................................ 2-4

ARPA....................................................... 6-2

Bearing.................................................... 2-7

Blind Sectors........................................... 4-4

Brilliance........................................... 2-4, 3-8

Course Up ............................................... 2-6

CPA/TCPA alarm..................................... 6-6

Cursor ..................................................... 2-7

EBL ........................................................ 2-7

Echo Stretch............................................ 2-6

Echo T rail.............................................. 3-4

Echonomy Mode ..................................... 2-3

Function Keys ........................................ 3-8

Fuse ........................................................ 5-1

Gain......................................................... 2-4

Guard Alarm.......................................... 3-4

Guard zone ............................................. 3-4

Head Up.................................................. 2-6

Heading Marker....................................... 2-6

Index Line................................................ 3-1

Indirect Echoes ....................................... 4-2

Interference ........................................... 3-2

OTHER MENU...................................... 3-7

Offcenter ................................................. 2-9

Offset EBL............................................... 2-8

Presentation Mode.................................. 2-6

Preventitive Maintenance....................... 5-1

Program No............................................. 5-3

Pulsewidth............................................... 2-4

Pulselength ............................................. 2-4

Range...................................................... 2-4

Range Ring ............................................. 2-4

SART.......................................................... iii

Second-trace echoes .............................. 3-8

Self T est .................................................. 5-3

Sensitivity................................................ 2-4

Shadow Sectors ...................................... 4-2

Side-lobe Echoes .................................. 4-1

Stand-by.................................................. 2-3

TLL.......................................................... 3-8

Trail tone ................................................. 3-4

Transmitting ............................................ 2-3

Troubleshooting .................................... 5-2

Turning On and Off.................................. 2-3

Vector length ........................................... 6-6

Vector mode............................................ 6-6

VRM ........................................................ 2-7

Watcnman ............................................... 3-6

Lost target alarm ..................................... 6-6

Magnetron ............................................. 5-3

Multiple Echoes....................................... 4-1

MENU TREE........................................... vii

Navigation Data.............................. 2-3, 3-3

Noise....................................................... 3-8

North Marker ........................................... 2-6

North Up.................................................. 2-6

Zoom....................................................... 2-9

IN-1

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Furuno FR-7112, FR-7062, FR-7252 User Manual 2

Specifications and Main Features

Frequently Asked Questions

User Manual

FOREWORD

Features

TABLE OF CONTENTS

MENU TREE

SYSTEM CONFIGURATION

1. PRINCIPLE OF OPERATION

1.1 What is Radar?

1.2 How Ships Determined Position Before Radar

1.3 How Radar Determines Range

1.4 How Radar Determines Bearing

1.5 Radar Wave Speed and Antenna Rotation Speed

1.6 The Radar Display

2. BASIC OPERATION

2.1 Control Description

2.3 Turning the Radar On/Off

2.5 Stand-by

2.4 Transmitting

2.6 Selecting the Range

2.8 Adjusting Receiver Sensitivity

2.7 Adjusting Picture Brilliance

2.9 Adjusting the A/C SEA Control (reducing sea clutter)

2.10 Adjusting the A/C RAIN Control (reducing rain clutter)

2.11 Selecting the Presentation Mode

2.13 Magnifying Long Range Echoes (echo stretch)

2.12 Erasing the Heading Marker, North Marker

2.14 Measuring the Range

2.15 Measuring the Bearing

2.16 Using the Offset EBL

2.18 Zoom

2.17 Shifting (off centering) the Picture

3. ADV ANCED OPERA TION

3.1 Basic Menu Operation

3.2 Index Lines

3.3 Suppressing Radar Interference

3.4 Selecting Pulsewidth

3.5 Displaying Navigation Data

3.6 Echo Trail

3.7 Guard Alarm

3.8 Watchman

3.9 OTHER MENU Description

3.10 Function Keys

3.13 Suppressing Noise

3.14 Outputting Target Position

3.15 Tuning the Receiver

3.11 Adjusting Brilliance of Markers

4. FALSE ECHOES

4.1 Multiple Echoes

4.2 Side-lobe Echoes

4.3 Indirect Echoes

4.4 Blind and Shadow Sectors

5. MAINTENANCE & TROUBLESHOOTING

5.2 Replacing the Fuse

5.3 Troubleshooting

5.4 Self Test

6. ARP-10 (OPTION)

6.1 General

6.2 Keys Used for Auto Plotter

6.3 Activating the Auto Plotter

6.4 Manual Acquisition

6.5 Automatic Acquisition

6.6 Terminating Tracking of Targets

6.7 Displaying Target Data

6.8 Mode and Length of Vectors

Index