Furuno Marine RADAR FR 1710 User Manual

MARINE RADAR

FR-1710/1725/1760DS

MODEL

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Your Loc al A gent/Deal er

9 - 5 2 , A s h i h a r a - c h o ,

N i s h i n o m i y a , J a p a n

Tel ephone:

Tel efax :

0798- 65- 2111

0798- 65- 4200

FIRST EDITION

NOV. 1998

APR. 9, 2001

Printed in Japan

PUB. No. OME-34530

F R- 1700 S E RIE S

(YOSH)

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SAFETY INSTRUCTIONS

DANGER

Before turning on the radar,

make sure that there is no one

near the antenna.

WARNING

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.

Serious injury or even death may result if

a rotating antenna strikes someone standing

nearby.

Do not operate the equipment with wet

hands.

Electrical shock can result.

WARNING

Keep heater away from equipment.

Radio Frequency Radiation

Hazard

Heat can alter equipment shape and melt

the power cord, which can cause fire or

electrical shock.

The radar scanner emits electromagnetic

radio frequency (RF) energy which can be

harmful, particularly to your eyes. Never

look directly into the scanner aperture from

a close distance while the radar is in oper-

ation or expose yourself to the transmitting

scanner at a close distance.

Distances at which RF radiation levels of

100 and 10 W/m²exist are given in the

table below.

Note: If the scanner unit is installed at a

close distance in front of the wheelhouse,

your administration may require halt of

transmission within a certain sector of

scanner revolution. This is possible Ask

your FURUNO representative or dealer to

provide this feature.

Distance to Distance to

Radiator

type

Model

100W/m

point

10W/m

point

SN4A

SN5A

—

1.2 m

1.0 m

0.15 m

—

FR-1760DS

FR-1710

XN12AF

XN20AF

SN24AF

1.1 m

1.0 m

FR-1725

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Danger/Warning Labels in Display

Unit

WARNING

ELECTRICAL SHOCK HAZARD

Do not open the equipment.

This radar system contains the danger/

warning labels shown below. Do not remove

the labels. If a label is peeling off or is illeg-

ible, contact a FURUNO agent for replace-

ment.

Only qualified personnel

should work inside the

equipment.

WARNING

To avoid electrical shock, do not

remove cover. No user-serviceable

parts inside.

Turn off the radar power

switch before servicing the

scanner unit. Post a warn-

ing sign near the switch

indicating it should not be

turned on while the scanner

unit is being serviced.

Name : Warning Label

Type : 86-003-1011

Code No. : 100-236-230

Prevent the potential risk of

being struck by the rotating

scanner and exposure to

RF radiation hazard.

DANGER

Electrical shock hazard.

Do not touch parts inside

this cover.

Wear a safety belt and hard

hat when working on the

scanner unit.

Name : Danger Label

Type : 14-055-4202

Code No. : 100-245-220

Serious injury or death can

result if someone falls from

the radar scanner mast.

DANGER

Electrical shock hazard.

Turn off power before

servicing.

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 equip-

ment is emitting smoke or fire.

Name : Danger Label

Type : 66-022-2012

Code No. : 100-237-730

Continued use of the equipment can cause

fire or electrical shock.

DANGER

Electrical shock hazard.

Do not touch anode cap

or its cable.

Use the proper fuse.

Fuse rating is shown on the equipment.

Use of a wrong fuse can result in equipment

damage.

Name : Danger Label

Type : 14-055-4201

Code No. : 100-243-450

Keep heater away from equipment.

Heat can alter equipment shape and melt

the power cord, which can cause fire or

electrical shock.

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TABLE OF CONTENTS

INTRODUCTION.................................................................................v

SYSTEM CONFIGURATION.............................................................vi|

MENU TREE ....................................................................................viii

OPERATIONAL OVERVIEW

1.1 Turning on the Power ................................................................................................... 1-1

1.2 Transmitter ON............................................................................................................. 1-1

1.3 Control Description....................................................................................................... 1-2

1.4 CRT Brilliance .............................................................................................................. 1-3

1.5 Control Panel Backlighting ........................................................................................... 1-3

1.6 Tuning the Receiver ..................................................................................................... 1-3

1.7 Degaussing the Screen................................................................................................ 1-4

1.8 Initializing the Compass Readout ................................................................................ 1-4

1.9 On-screen Legends and Markers ................................................................................ 1-5

1.10 Presentation Modes ................................................................................................... 1-6

1.11 Selecting the Range Scale ......................................................................................... 1-8

1.12 Entering Own Ship’s Speed ....................................................................................... 1-9

1.13 Pulselength, Echo Stretch........................................................................................ 1-10

1.14 Adjusting the Sensitivity ........................................................................................... 1-12

1.15 Suppressing Sea Clutter .......................................................................................... 1-12

1.16 Suppressing Precipitation Clutter............................................................................. 1-13

1.17 Interference Rejector ............................................................................................... 1-13

1.18 Measuring the Range............................................................................................... 1-14

1.19 Measuring Bearing ................................................................................................... 1-14

1.20 Collision Assessment by the Offset EBL .................................................................. 1-15

1.21 Measuring Range and Bearing Between Two Targets ............................................. 1-15

1.22 Setting a Target Alarm Zone..................................................................................... 1-16

1.23 Off-centering (shift) .................................................................................................. 1-17

1.24 Echo Averaging ........................................................................................................ 1-18

1.25 Electronic Plotting Aid (EPA) .................................................................................... 1-19

1.26 Target Trails (Echo Trails) ........................................................................................ 1-22

1.27 Parallel Index Lines.................................................................................................. 1-25

1.28 Origin Mark............................................................................................................... 1-25

1.29 Zoom ........................................................................................................................ 1-26

1.30 Markers .................................................................................................................... 1-26

1.31 User Keys (F1, F2, F3) ............................................................................................ 1-27

1.32 Function Keys .......................................................................................................... 1-27

1.33 Suppressing Second-trace Echoes.......................................................................... 1-29

1.34 Adjusting Brilliance of Screen Data .......................................................................... 1-29

1.35 Noise Rejector.......................................................................................................... 1-30

1.36 Time Alarm ............................................................................................................... 1-30

1.37 Enhanced Video....................................................................................................... 1-30

1.38 Degaussing Interval ................................................................................................. 1-31

1.39 Navigation Data........................................................................................................ 1-31

1.40 Video Contrast ......................................................................................................... 1-32

iii

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INTRODUCTION

A Word to the Owner of This FURUNO Radar

Thank you for purchasing this FURUNO radar. We are confident you will discover why FURUNO

has become synonymous with quality and reliability.

Dedicated in the design and manufacture of marine electronics equipment for half a century,

FURUNO Electric Company has gained an unrivaled reputation as a world leader in the in-

dustry. This is the result of our technical excellence as well as our worldwide distribution and

service network.

Please carefully read and follow the safety information set forth in this manual before attempt-

ing to operate the equipment and conduct any maintenance. Your radar set will perform to the

utmost of its ability only if it is operated and maintained in accordance with the correct proce-

dures.

Features

■ FR-1760DS is 60kW, S-band radar, FR-1710 is 10kW, X-band radar and FR-1725 is 25kW,

X-band radar.

■ Daylight-bright rasterscan 17-inch multi-color, high-resolution display

■ New microprocessing technology with high-speed high-density gate array and software

expertise

■ Easy operation by combination of discrete keys, rotary controls, and menu operation, all

logically arranged and configured

■ Electronic Plotting Aid (EPA) fitted standard, Automatic Tracking Aid (ATA) option

■ Reliable CPA and TCPA warning in any plotting mode, accurate target data

■ The Clutter Sweep feature suppresses sea and rain clutters within an operator-selected

area.

■ A Video Plotter (Chart Plotter) and Performance Monitor are also optionally available.

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SYSTEM CONFIGURATION

FR-1760DS

ANTENNA UNIT

SN4A-RSB-0051-N

SN4A-RSB-0051-I

SN5A-RSB-0051-N

SN5A-RSB-0051-I

110/115/

220 VAC,

1φ, 50/60 Hz

Rectifier

RU-3305

For de-icer

100 VAC,

1φ, 50/60 Hz

POWER

SUPPLY

UNIT

100/110/

115 VAC,

1φ, 50/60 Hz

PSU-002

220 VAC,

1φ, 50/60 Hz

Rectifier

RU-1758

440 VAC,

1φ, 50/60 Hz

Rectifier

RU-1803

Serial Data

(I/O)

GPS, etc.

DISPLAY UNIT

RDP-120

Pulse Input

Speed Log

ATA Board

ARP-17

Remote Display

FMD-8010/FMD-811

Water temperature,

water depth

Gyro Converter

GC-8A

Gyrocompass

External

Buzzer

OP03-21

Video Plotter

RP-17 Board

Option

Rectifier

RU-3424

100/110/115/220/230 VAC,

1φ, 50/60 Hz

Ship’s Mains

24/32 VDC

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FR-1710/1725

FR-1710

XN12AF-RSB0074-062 (24 rpm)

XN20AF-RSB0074-062 (24 rpm)

XN12AF-RSB0075-062 (42 rpm)

XN20AF-RSB0075-062 (42 rpm)

ANTENNA UNIT

FR-1725

XN20AF-RSB0074-063 (24 rpm)

XN24AF-RSB0074-063 (24 rpm)

XN20AF-RSB0075-063 (42 rpm)

XN24AF-RSB0075-063 (42 rpm)

Serial Data

(I/O)

GPS, etc.

DISPLAY UNIT

RDP-120

Pulse Input

Speed Log

ATA Board

ARP-17

Remote Display

FMD-8010/FMD-811

Water temperature,

water depth

Gyro Converter

GC-8A

Gyrocompass

External

Buzzer

OP03-21

Video Plotter

RP-17 Board

Option

Rectifier

RU-3424

*: FR-1725 only

Ship’s Mains

24/32 VDC

Note: The display unit is available

in AC or DC specification.

100/110/115/220/230 VAC,

1φ, 50/60 Hz

vii

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MENU TREE

MENU key

TGT TRAIL

15S 30S 1M 3M

6M 15M 30M CONT

: Default

settings

1. TIME

2. MODE

REL TRUE

3. SHADE

MONO MULTI

1. VIDEO PLOT*

4. LEVEL

2 3

2. TGT TRAIL

3. TGT ALARM

4. PANEL DIM

5. ECHO SIG

6. FUNC

5. TRAIL COPY

6. THIN TRAIL

7. THIN MODE

OFF ON

2 3 4

7. PLOT

TGT ALARM

NO1 NO2

8. MARK

1. AREA

9. BRILL

2. MODE1

3. MODE2

OUT

0. OTHER

* Requires Video Plotter

RP-17.

DIMMER

1. PANEL

BRIGHT 7 6

3 2 DIM

ECHO SIG

* COLOR not shown

on HK type radar.

1. TGT COLOR

2. ECHO AVG

3. INT REJ

YEL GRN COLOR*

OFF 0.5 1

OFF

4. N REJ

OFF ON

5. ENHANCE

6. 2ND ECHO

7. CONTRAST

8. CLTR SWEEP

9. SWEEP LVL

OFF ON(LINK) ON(FIX)

0. CNTR ENHANCE OFF ON

FUNC

1. FUNC1

2. FUNC2

3. F•1

4. F•2

5. F•3

6. A/D CURVE A B C D

viii

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PLOT MENU 1

OFF ON

1. MARK DISP

2. ERASE

3. VEC REF

4. VEC TIME

REL TRUE

30S

15M

3M 6M

30M

5. CPA SET

OFF 0.5NM 1NM 1.5NM

2NM

5NM

30S

3NM 4NM

6NM

6. TCPA SET

6M 12M 15M

7. TRACK

8. AUDIO ALARM

9. INTVAL*

0. ↓*

OFF ON

* Requires Automatic Tracking Aid

ARP-17 (Option).

30S

1M 2M 3M 6M

[0]

PLOT MENU 2*

1. ↑

2. AUTO

OFF ON SET

3. GUARD ZONE

4. TRACK TEST

5. LAND DISCRIM 0 1 2 3 4 5

6. TTM

OFF REL TRUE

1MIN 20SCAN

7. VEC START

8. REF TGT VECTOR OFF ON

9. TARGET BASED SPEED

MARK

1. ERASE

2. MODE

REL TRUE

BRILL

PLOTTER BRILL*

1. TGT TRAIL

1. ↑

2. CHARACTER

3. HDG LINE

4. EBL/VRM

5. CURSOR

6. MARK

2. LAND

3. GRID

4. MARK

5. OS TRACK

6. TGT TRACK

7. COLOR

7. PLOT

8. OS SYMB

9. ↓^*

* Requires Video Plotter RP-17 (option).

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OTHER

MAN LOG NAV

1. HDG SET

2. SPD MODE

LOG (S-BT)

LOG (S-WT)

DRIFT SET

1. ↑

3. MAN SPD

4. DRIFT SET

5. DISPLAY

6. MARK/LINE

7. TUNE

2. SET&DRIFT OFF ON

3. SET

4. DRIFT

8. NAV DATA

9. EBL/VRM

0. ↓

DISPLAY

1. ↑

2. NAV DATA

3. DISPLAY

4. SART

OFF ON

MAIN SUB

OFF ON

5. P M

MARK/LINE

1. ↑

2. INDEX LINES

EBL/VRM

3. STERN MARK OFF ON

4. SHIP’S MARK OFF ON

5. BEARING SCALE 360 COMPASS

1. ↑

2. CURS BRG

REL TRUE

NM KM SM

3. EBL1

4. EBL2

5. CURS RNG

6. VRM1

7. VRM2

TUNE

1. ↑

2. MODE

AUTO MAN

3. TUNE SET

NAV DATA

1. ↑

2. NAV SEL

3. EXT WP

4. OS POSN

5. DEPTH

6. TEMP

ANY GPS LC

OFF ON

OFF L/L TD

°C °F

UTC LOCAL

7. TIME DIF

8. LOCAL TIME

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FUNC 1 MENU

1. ↑

2. FUNC SEL

COAST OCEAN

R-SEA RAIN

BIRD-N BIRD-F

3. ECHO AVG

4. INT REJ

OFF 0.5 1

OFF 1 2 3

5. STRETCH

6. N REJ

OFF 1

OFF ON

OFF 1

7. ENHANCE

8. CONTRAST

9. A/C AUTO

OFF ON

[F•2 MENU]

1. TRAIL TIME

26. HUTB MODE

27. TUNE A/M

28. EXT WP

29. OS POSN

30. CURS BRG

31. EBL1 T/R

32. EBL2 T/R

33. CURS RNG

34. VRM1 RNG

35. VRM2 RNG

2. TRAIL MODE

3. TRAIL SHADE

4. TRAIL LEVEL

5. ALARM AREA

6. ALARM MODE

7. PANEL DIMMER

8. TGT COLOR

9. ECHO AVG

10. INT REJ

11. ECHO STRETCH

12. NOISE REJ

13. ECHO ENHANCE

14. 2ND ECHO

15. CONTRAST

16. PLOT MENU

17. MARK MODE

18. BRILL MENU

19. DRIFT MENU

20. NAV DATA

21. DISPLAY

36. CLTR SWEEP

37. MARK MENU

38. DISP MODE

39. A/D CURVE

40. DRIGIN MARK

41. DEST ON CSR

22. SART

23. TIME ALARM

24. STERN MARK

25. OS MARK

Select by VRM knob

and hit ENTER key.

37 and 38 shown with connection of RP-17.

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DEGAUSS

OTHER

1. ↑

2. DEGS INTV

OFF 30S 1M 2M

OFF 45° 90° 135°

2. TEST

3. DEGS DEG

3. DEGAUSS

4. TIME ALARM

5. RANGE

TIME ALARM

6. INSTALL*

1. ↑

2. ALARM INTV

OFF 3M 6M

12M 15M 20M

*: See Installation Manual.

RANGE

1. ↑

2. RANGE

1/8 1/4 1/2

3/4 1 1.5 2 3

8 12 16

24 32 48 72 96 120

FR-1760DS

FR-1710

FR-1725

Max. range: 120 NM

Max. range: 72 NM

Max. range: 96 NM

xii

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OPERATIONAL OVERVIEW

1.1 Turning on the Power

1.2 Transmitter ON

The [POWER] switch is located at the top

left corner of the display unit. Push it to switch

on the radar set. To turn off the radar, push it

again. The screen shows the bearing scale

and digital timer approximately 15 seconds

after power-on. The timer counts down three

minutes of warm-up time. During this period

the magnetron, that is, the transmitter tube,

is warmed for transmission. When the timer

has reached 0:00, the indication STBY ap-

pears, indicating that the radar is now ready

to transmit pulses.

After the power has been turned on and the

magnetron has warmed, STBY (Standby) ap-

pears at the screen center, indicating the ra-

dar is ready to transmit radar pulses.

Press the [STBY/TX] key to transmit.

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 standby by

pressing the [STBY/TX] key. The display

shows STBY when the radar is in standby.

Video Lockup Recovery

POWER

switch

Video freeze-up or lock-up, can occur unex-

pectedly on digital rasterscan radars. This is

mainly caused by heavy spike noise in the

power line and can be noticed by carefully

watching the nearly invisible sweep line.

If you suspect that the picture is not updated

every scan of the antenna or no key entry is

accepted notwithstanding the apparently

normal picture, do Quick Start to restore

normal operation.

1. Turn off the POWER switch and turn it on

again within 10 seconds.

2. Push the Transmit switch labeled STBY/TX

for Transmit status.

Figure 1-1 Location of power switch

DANGER

Before turning on the radar, make sure

that there is no one near the antenna.

Serious injury or even death may result if

a rotating antenna strikes someone standing

nearby.

1-1

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1.3 Control Description

MODE

Selects presentation mode.

TGT

TRAIL

Turns on/off target trails.

ALARM

Enables/disables guard zone.

Off centers picture.

SHIFT

ZOOM

Turns zoom function on/off.

INDEX

LINE

Turns parallel index lines on/off.

EBL

OFFSET

Offset EBL origin to measure range,

bearing between two targets;

predict collision course.

MARK

RINGS

Inscribes mark.

Turns power on/off.

Adjusts brilliance of fixed range

rings.

Chart card slot

(Requires video

plotter.)

Displays previous menu.

Opens/closes menu.

CANCEL

CLEAR

Menu open: Cancels item selected.

Menu closed: Erases mark.

ENTER

Menu open: Registers selection.

Menu closed: Displays data of

selected plot symbol.

SELECT

TRACKBALL

Shifts cursor.

ROTATE: Adjusts gain.

PUSH: Temporarily erases heading line,

markers (stern, north) OS symbol.

ROTATE: Suppresses

sea clutter.

PUSH: Turns on/off

automatic clutter

suppression.

ROTATE: Adjusts

screen brilliance.

PUSH: Selects back-

ground color.

Selects pulse-

length, echo

stretch.

Adjusts radius

of VRM.

ROTATE: Rotates EBL.

PUSH: Degausses

screen.

DEGAUSS (PUSH) BKGND COLOR (PUSH)

TLL (PUSH)

A/C AUTO (PUSH)

HL OFF (PUSH)

-1

-2

-3

BRILL

A/C RAIN

A/C SEA

GAIN

ECHO

ACQ

Manually acquires

target (plotting

function).

EBL

VRM

Alternately selects

No.1 EBL,

No.2 EBL.

RANGE

AUDIO

OFF

STBY

OFF

Silences timer,

ATA and EPA

alarms.

Erases EBL.

Activates

desired

Selects range

scale.

Alternately selects

No.1 VRM, No.2 VRM.

function.

Erases VRM.

Turns on/off

ROTATE: Suppresses menu-selected

Transmit/standby

switch

precipitation clutter.

PUSH: Outputs

target position.

function.

Figure 1-2 Control description

1-2

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1.4 CRT Brilliance

1.6 Tuning the Receiver

Operate the BRILL control on the control

panel of the display unit to adjust the entire

screen brightness. Note that the optimum

point of adjustment varies with ambient light-

ing conditions, especially between daytime

and nighttime.

The radar is set for automatic tuning at the

factory.

Automatic tuning

The radar receiver is tuned automatically

each time the transmitter is turned on. The

tuning indicator and the label AUTO at the

top right corner of the display unit shows the

tuning circuit is working. The receiver may

become detuned, in automatic tuning, if own

ship’s radar receives the radar signal of an-

other shipborne radar. To retune, press the

[STBY/TX] key twice.

1.5 Control Panel Backlighting

1. Press the [MENU] key.

1. VIDEO PLOT

2. TGT TRAIL

3. TGT ALARM

4. PANEL DIM

5. ECHO SIG

6. FUNC

Manual tuning

1. Set up for manual tuning following the

procedure shown below.

7. PLOT

8. MARK

2. While observing the picture on the 48 mile

scale, press and hold down the GAIN

control while slowly adjusting the VRM ro-

tary control to find the best tuning point.

This condition is where the tuning indica-

tor lights to about 80% of its total length.

Note that the tuning indication will never

extend to full length.

9. BRILL

0. OTHER

Figure 1-3 Main menu

2. Press the [4] key twice. The following dis-

play appears.

DIMMER

1. PANEL

BRIGHT

2 DIM

Selection of manual or automatic

tuning

Figure 1-4 Screen for adjustment

of panel dimmer

1. Press the [MENU] key.

3. Press the [1] key to select backlighting

level desired.

2. Press the [0] key twice to display the

OTHER menu.

4. Press the [ENTER/SELECT] key to reg-

ister your selection and the [MENU] key

to close the menu.

OTHER

1. HDG SET

2. SPD MODE

MAN LOG NAV

LOG (S-BT)

LOG (S-WT)

3. MAN SPD

4. DRIFT SET

5. DISPLAY

6. MARK/LINE

7. TUNE

8. NAV DATA

9. EBL/VRM

0. ↓

Figure 1-5 OTHER menu

1-3

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3. Press the [7] key twice to display the

TUNE menu.

1.8 Initializing the Compass

Readout

TUNE

With a compass interfaced with the radar,

ship’s heading is displayed at the top of the

screen. Upon turning on the radar, match the

on-screen HDG readout with the compass

reading by the procedure shown below. Once

you have set the initial heading correctly, re-

setting is not usually required. However, if the

HDG readout goes wrong for some reason,

repeat the procedure to correct it.

1. ↑

2. MODE

AUTO MAN

3. TUNE SET

Figure 1-6 TUNE menu

4. Press the [2] key to select the option

AUTO or MAN from the MODE field.

5. Press the [ENTER/SELECT] key.

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

menu.

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

2. Press the [0] key twice to display the

OTHER menu.

1.7 Degaussing the Screen

OTHER

Each time the radar is turned on, the de-

gaussing circuit automatically demagnetizes

the CRT screen to eliminate color contami-

nation caused by earth’s magnetism or mag-

netized ship structure.

1. HDG SET

2. SPD MODE

MAN LOG NAV

LOG (S-BT)

LOG (S-WT)

3. MAN SPD

4. DRIFT SET

5. DISPLAY

6. MARK/LINE

7. TUNE

The screen is also degaussed automatically

at certain time intervals, which may be se-

lected on the menu. While being degaussed,

the screen may be disturbed momentarily

with vertical lines. If you wish to degauss by

manual operation, push the EBL rotary con-

trol (DEGAUSS control).

8. NAV DATA

9. EBL/VRM

0. ↓

Figure 1-7 OTHER menu

3. Press the [1] key to select HDG SET.

4. Operate the VRM rotary control to dupli-

cate the compass readout on the radar

menu display.

5. Press the [ENTER/SELECT] key.

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

1-4

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1.9 On-screen Legends and Markers

Heading

(Requires heading sensor.)

Heading line

2nd trace echo

Log speed (Requires log device.)

Tuning bar

Range ring interval

Range to cursor

rejector

Range to cursor

2nd Echo

HDG 234.5°

LOG 12.8 KT

AUTO

GAIN setting

8/2 NM

GAIN

A/C SEA

A/C RAIN

BRILL

4.111NM

Bearing to cursor

A/C SEA setting

103.7°R

PULSE MIP

OFF CENT

FUNC1

A/C RAIN setting

BRILL setting

Presentation mode

Pulselength

000

010

350

020

340

030

330

COAST

Offcenter

040

320

Function

Cursor

310

050

300

060

290

Target alarm

zone No. 1

Waypoint marker

No. 1 EBL

No. 2 EBL

Target alarm

zone No. 2

No.1 VRM

No.2 VRM

North marker

110

Range rings

240

120

230

130

Interference

rejector

220

140

IR2

ES1

150

210

Echo stretch

160

200

Guard zone (active one

is circumscribed)

Guard zone mode

Target trail reference

Target trail time,

elapsed time

190

170

180

Noise rejector

Auto clutter

reduction

Echo averaging

GZ1 GZ2

OUT IN

A/C AUTO

EAV1

40.36’N

18.23’E

OS 34°

(L/L)

40°21.211’N

127°21.321’E

135°

REL TRAIL

30S 0 : 16

VRM

VIDEO

RNG 123.9NM

BRG 220°R

TTG 00:20

TTG 00 : 50

CONTRAST1

EBL

Video contrast

TEMP

DEPTH

20.1°C

123.5M

T-ALM 2.093 NM

345.6° R

23.0° R

No. 1 EBL

bearing

9/22 12:34 UTC

No. 1 VRM

range

4.465 NM

02:30

No. 2 VRM

range

Timer alarm

countdown

Date, time

No. 2 EBL

bearing

Water temperature,

water depth

Range, bearing

to waypoint

Cursor position,

time-to-go

Own ship position

Figure 1-8 On-screen legends and markers

Note: The cursor functions to measure the range and bearing to a radar target, and is perma-

nently displayed. It can be returned to the screen center by pressing the VRM rotary control.

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Loss of Compass Signal

1.10 Presentation Modes

When the compass signal is lost, the buzzer

sounds once, the presentation mode becomes

head-up and the compass readout shows

xxx.x°. After restoring the compass signal,

press the [MODE] key to display the compass

readout. Readjust the compass readout as

shown on page 1-4. Also HDG SIGNAL

This radar has the following presentation

modes: Head-up, Head-up/TB, Course-up,

North-up, and True Motion.

Selecting presentation mode

MISSING appears at the bottom of the screen.

Press the [MODE] key on the panel at the

right side of the display unit. Each time the

[MODE] key is pressed, the presentation

mode and mode indication at the upper-left

corner of the screen change cyclically.

Note: When a failure occurs in the gyrocom-

pass, the radar will automatically be switched

to unstabilized presentation mode. All com-

pass related data will read Relative values.

Presentation mode,

representative display

Description

Heading

line

Head-up Mode

Heading

marker

North

000

350

010

020

340

A display without azimuth stabilization in which

the line connecting the center with the top of the

display indicates own ship’s heading.

marker

330

030

320

040

310

300

290

280

050

060

070

080

The target pips are painted at their measured dis-

tances and in their directions relative to own ship’s

heading.

090

100

270

260

A short line on the bearing scale is the north marker

indicating compass north. A failure of the compass

input will cause the north marker to disappear and

the HDG readout to show asterisks xxx.x°.

250

240

110

120

130

230

140

220

210

150

200

160

190

170

180

Heading

marker

Head-up TB (True Bearing) Mode

Heading

line

North

marker

030

020

040

010

050

000

Radar echoes are shown in the same way as in the

head-up mode. The difference from normal head-up

presentation lies in the orientation of the bearing

scale. The bearing scale is compass stabilized, that

is, it rotates in accordance with the compass signal,

enabling you to know own ship’s heading at a glance.

060

350

340

070

080

330

320

310

300

290

280

270

260

090

100

110

120

130

140

150

This mode is available only when the radar is inter-

faced with a compass.

If the compass fails, the bearing scale returns to the

state of head-up mode.

250

160

170

240

180

230

190

220

200

210

The bearing scale rotates with

a compass signal.

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Presentation mode,

representative display

Description

Course-up Mode

Heading

line

marker

North

An azimuth stabilized display in which a line connect-

ing the center with the top of the display indicates own

ship’s intended course (namely, own ship’s previous

heading just before this mode has been selected).

Target pips are painted at their measured distances

and in their directions relative to the intended course

which is maintained at the top of screen while the

heading line moves in accordance with ship’s yawing

and course changes. This mode is useful to avoid

smearing of picture during course change. After a

course change, press the [SHIFT] key to reset the

picture orientation if you wish to continue using the

course-up mode. The heading line gets back to

perpendicular.

030

020

040

010

marker

050

000

060

350

340

070

080

330

320

310

300

290

280

270

260

090

100

110

120

130

140

150

250

160

170

240

180

230

190

220

200

210

North

North-up Mode

Heading

line

Heading

marker

000

350

010

020

In the north-up mode, target pips are painted at their

measured distances and in their true (compass)

directions from own ship, north being maintained

up of the screen. The heading line changes its

direction according to the ship’s heading.

340

330

030

040

320

310

300

290

280

050

060

070

080

If the compass fails, the presentation mode changes

to head-up and the north marker disappears. Also,

the HDG readout shows xxx.x°.

090

100

270

260

250

240

110

120

130

230

140

220

210

150

200

160

190

170

180

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Presentation mode,

representative display

Description

North

True Motion Mode

Heading

line

marker

000

350

010

Heading

marker

020

340

330

Own ship and other moving objects move in accord-

ance with their true courses and speeds. In ground

stablized TM, all fixed targets, such as landmasses,

appear as stationary echoes. In the sea stablized TM

without set and drift input, the landmass can move on

the screen.

030

320

040

310

300

290

280

050

060

070

080

270

260

090

100

When own ship reaches a point corresponding to

75% of the radius of the display, the own ship is

automatically reset to a point of 75% radius opposite

to the extension of the heading line passing through

the display center. Resetting can be made at any

moment before the ship reaches the limit by pressing

the [SHIFT] key. Automatic resetting is preceded by a

beep sound.

250

240

110

120

130

230

220

140

210

150

200

160

190

170

180

If the compass fails, the presentation mode is

changed to the head-up mode and the north marker

disappears. The HDG readout at the top of the

screen shows xxx.x°.

North

marker

350 000 010

340

020

340

020

Heading

line

330

030

330

030

330

030

320

040

310

300

290

280

050

060

070

080

310

300

290

280

050

060

070

080

310

300

290

280

050

060

070

080

270

260

090

100

270

260

090

100

270

260

090

100

250

240

250

240

230

250

240

230

110

120

110

120

110

120

130

230

130

140

130

140

220

140

210

150

200

160

200

160

200

160

190 180 170

(a) True motion

is selected

(b) Own ship has reached a

point 75% of display radius

reset to 75% of radius

Automatic resetting of own ship position in true motion mode

Press the [RANGE] key to select a range

1.11 Selecting the Range Scale

scale. The range, range ring interval and

pulselength appear at the top left corner of

the display.

The range selected automatically determines

the range ring interval, the number of

range rings and pulse repetition rate, for

optimal detection capability in short to long

ranges. You can select pulselength with

the ECHO control. For details, see para-

graph 1.13.

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4. Press the [ENTER/SELECT] key to con-

firm your selection followed by the

[MENU] key to close the menu.

1.12 Entering Own Ship’s

Speed

EPA requires an own ship speed input and

compass signal. The speed can be entered

from a speed log or navaid (automatic) or

through the plotting keypad (manual).

Note: Be sure not to select a LOG option or

NAV when respective equipment is not con-

nected. If the log signal or navaid signal is

not provided, the ship’s speed readout at the

screen top will be blank.

Automatic speed input

Manual speed input

1. Press the [MENU] key and the [0] key

twice to show the OTHER menu.

If the radar is not interfaced with a speed log,

or the speed log does not feed correct speed

enter the ship’s speed as follows:

OTHER

1. HDG SET

2. SPD MODE

MAN LOG NAV

LOG (S-BT)

1. Press the [MENU] key and the [0] key

twice to show the OTHER menu.

LOG (S-WT)

3. MAN SPD

4. DRIFT SET

5. DISPLAY

6. MARK/LINE

7. TUNE

2. Press the [2] key to select MAN from the

SPD MODE field, and then press the [EN-

TER/SELECT] key.

3. Press the [3] key twice to select the MAN

SPD field.

8. NAV DATA

9. EBL/VRM

0. ↓

4. Enter speed with the numeric keys.

5. Press the [ENTER/SELECT] key to con-

firm your selection followed by the

[MENU] key to close the menu.

Figure 1-9 OTHER menu

2. Press the [2] key to select the menu item

SPD MODE.

LOG 10.0KT WT

Or NAV

3. Press the [2] key again to select the LOG

or NAV.

LOG or NAV speed indication

LOG:

Pulse input from speed

log, serial data

Speed data from naviga-

tion equipment

8.5 F ← Fore/Aft

LOG 8.7KT WT

NAV:

0.5 SB ← Port/STBD

LOG (serial data) speed indication

About Ship’s Speed

a: Fore/aft speed

b: Port/starboard speed

c: Speed made good (actual speed)

c’

Pulse signal: a only (water tracking speed)

Serial speed: a and b

Water tracking speed = relative speed

(including error due to wind, current

Ground tracking speed = true speed

(no influence from wind, currents)

Navigator speed: c→c’

Wind,

current

Speed input (c) from navgator (GPS, etc.)

c is converted to fore/aft direction (c’) and

displayed on the radar screen.

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Note: The echo stretch magnifies not only

small target pips but also returns (clutter) from

sea surface, rain and radar interference. For

this reason make sure these types of inter-

ference have been sufficiently suppressed

before activating this function.

1.13 Pulselength, Echo Stretch

The ECHO control selects pulselength, and

echo stretch when it is not turned on with a

user key ([F1], [F2], [F3]). The pulselength in

use is displayed at the upper-left position of

the screen using the abbreviations (suffixed

with “P”) shown in the table on the next page.

Echo stretch level (ES1, ES2) in use appears

at the bottom left position, using the indica-

tion ES1 or ES2.

Enlarged in bearing

(circumferential)

direction with ES1

If a distant target

is hard to see,

use ES 1.

Appropriate pulselengths are preset to indi-

vidual range scales and function keys. There-

fore, you are not usually required to select

them. If you are not satisfied with the current

pulselength settings, however, it is possible

to change them by the ECHO control. The

ECHO control settings which can select the

echo stretch are shown in the table below.

The legend and pulselengths are shown in

below.

Enlarged with ES2

If a target becomes

smaller as it approaches

own ship, use ES 2.

FR-1710/1725

S1P: 0.07 µs

S2P: 0.15 µs

M1P: 0.3 µs

M2P: 0.5 µs

M3P: 0.7 µs

LP: 1.2 µs

FR-1760DS

SP: 0.08 µs

M1P: 0.3 µs

M2P: 0.6 µs

LP: 1.2 µs

Figure 1-10 Echo stretch

On long ranges target echoes tend to shrink

in the bearing direction, making them diffi-

cult to see. On short and medium ranges such

as 1.5, 3 and 6 nm scales, the same size

targets get smaller on screen as they ap-

proach the own ship. These are due to the

inherent property of the radiation pattern of

the antenna. To enhance target video, use

the echo stretch function. There are two

types: echo stretch 1 (ES1) to enlarge in bear-

ing direction for long range detection, and

echo stretch 2 (ES2) to enlarge in range di-

rection.

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Table 1-1a ECHO control setting, pulselength and echo stretch (FR-1710/1725)

Range

–

ECHO Control Position and Pulselength and Echo Stretch Settings

0.25

0.5

0.75

0.125

0.25

–

-3

-2

-1

S1P

S2P

M1P

S1P

S2P

M1P

M2P

M3P

S1P, ES1 S1P, ES1

S1P, ES1

S2P, ES1

M1P, ES1

M2P, ES1

M3P, ES1

LP, ES1

LP, ES2

0.25

–

S1P

S1P, ES1

S2P, ES1

M1P, ES1

M2P, ES1

M3P, ES2

M3P, ES1

LP, ES1

S2P

0.5

0.75

0.5

–

S1P

–

S1P

S1P, ES1

S1P ,ES1

S2P, ES1

M1P, ES1

M2P

M1P

1.5

0.75

S1P

M1P

1.5

S1P

M1P

1.5

S1P, ES1

S2P, ES1

M2P

–

M3P

–

M2P

–

M1P, ES1 M2P, ES1

M3P

LP, ES2

M2P, ES1

M3P

M3P, ES1

LP, ES1

M2P, ES1

LP, ES1

–

LP, ES1

–

LP, ES1

Table 1-1b ECHO control setting, pulselength and echo stretch (FR-1760DS)

Range

–

ECHO Control Position and Pulselength and Echo Stretch Settings

0.25

0.5

0.75

0.125

0.25

–

-3

-2

-1

S1P

M1P

M2P

S1P

M1P

M2P

S1P

M1P

M2P

S1P, ES1 S1P, ES1

S1P, ES1

M1P, ES1

M2P, ES1

LP, ES1

LP, ES2

0.25

–

S1P

0.5

0.75

0.5

–

S1P

–

S1P

S1P, ES1

M1P, ES1

M2P, ES1

M2P, ES2

M2P, ES1

LP, ES1

M1P

1.5

0.75

S1P

1.5

S1P

M1P

1.5

S1P, ES1

M1P, ES1

M2P, ES1

M2P

–

M2P

–

LP, ES2

LP, ES1

–

LP, ES1

120

LP, ES1

–

LP, ES1

120

LP, ES1

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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 lee-

ward, but a little is still visible windward.

1.14 Adjusting the 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.

1. Confirm that the sensitivity is properly

adjusted, and then transmit on short

range.

The proper setting is such that the back-

ground noise is just visible on the screen. If

you set up for too little sensitivity, weak ech-

oes may be missed. On the other hand ex-

cessive 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.

2. Adjust the A/C SEA control so small tar-

gets are distinguishable but some clutter

remains on the display.

To adjust receiver sensitivity, transmit on long

range, and adjust the GAIN control so back-

ground noise is just visible on the screen. The

current gain setting is shown by the “GAIN

bar” at the top right-hand corner of the screen.

A/C SEA control

adjusted

A/C SEA control

off

Figure 1-11 How to adjust

the A/C SEA control

1.15 Suppressing Sea Clutter

Echoes from waves cover the central part of

the display with random signals known as sea

clutter. The higher the waves, and the higher

the scanner above the water, the further the

clutter will extend. When sea clutter masks

the picture, suppress it by the A/C SEA con-

trol, rotate for manual adjustment, push for

automatic adjustment.

Automatic adjustment by the A/C

AUTO control

The A/C AUTO control automatically sup-

presses sea clutter as well as rain clutter.

Push the A/C SEA control to turn on the au-

tomaticA/C circuit.A/C AUTO appears at the

bottom left corner when the A/C AUTO cir-

cuit is on. Fine adjustment of the circuit can

be done with theA/C RAIN andA/C SEAcon-

trols.

Manual adjustment by the A/C SEA

control

The A/C SEA control reduces the amplifica-

tion of echoes at short ranges (where clutter

is the greatest) and progressively increases

amplification as the range increases, so am-

plification will be normal at those ranges

where there is no sea clutter.

CAUTION

Turn off the A/C AUTO feature when its use

is not required; it can erase weak target

echoes.

The proper setting of the A/C SEA control

should be such that the clutter is broken up

into small dots, and small targets become

distinguishable.

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There are three levels of interference rejec-

tion depending on the number of transmis-

sions that are correlated. These are indicated

by the legends IR1, IR2 and IR3 at the lower-

left position of the screen.

1.16 Suppressing Precipitation

Clutter

The vertical beamwidth of the scanner is de-

signed to see surface targets even when the

ship is rolling. However, by this design the

unit will also detect rain clutter (rain, snow,

or hail) in the same manner as normal tar-

gets. Figure 1-12 shows the appearance of

rain clutter on the display.

The A/C RAIN control adjusts the receiver

sensitivity as the A/C SEA control does but

rather in a longer time period (longer range).

Clockwise rotation of this control increases

the anti-clutter effect.

Figure 1-13 Interference

To activate the interference rejector;

1. Press the [MENU] key.

2. Press the [5] key twice to select ECHO

SIG.

ECHO SIG

1. TGT COLOR

2. ECHO AVG

3. INT REJ

YEL GRN COLOR

OFF 0.5 1 2 3

OFF 1 2 3

OFF ON

A/C RAIN control

OFF

A/C RAIN control

adjusted

4. N REJ

Figure 1-12 Effect of A/C RAIN control

5. ENHANCE

6. 2ND ECHO

7. CONTRAST

OFF ON

1 2 3

1.17 Interference Rejector

8. CLTR SWEEP OFF ON(LINK) ON(FIX)

9. SWEEP LVL 1 2 3

Mutual radar interference may occur in the

vicinity of another shipborne radar operating

in the same frequency band (9 GHz). It is

seen on the screen as a number of bright

spikes either in irregular patterns or in the

form of usually curved spoke-like dotted lines

extending from the center to the edge of the

picture. This type of interference can be re-

duced by activating the interference rejector

circuit.

0. CNTR ENHANCE OFF ON

Figure 1-14 ECHO SIG menu

3. Press the [3] key to select interference

rejection level (OFF, 1, 2, or 3) from the

INT REJ field.

4. Press the [ENTER/SELECT] key.

5. Press the [MENU] key.

The interference rejector is a kind of signal

correlation circuit. It compares the received

signals over successive transmissions and

suppresses randomly occurring signals.

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Target

1.18 Measuring the Range

Ring interval

0.55 NM

15.0°R

Measuring range by the fixed range

rings

Cursor

No. 1 VRM

(dotted)

Range and

bearing to

cursor

Use the fixed range rings to obtain a rough

estimate of the range to a target. They are

concentric solid circles about own ship, or the

sweep origin. The number of rings is auto-

matically determined by the selected range

scale and their interval is displayed at the

upper-left position of the screen. The fixed

range rings may be turned on/off and their

brilliance adjusted with the [RINGS] key.

No. 2 VRM

(dashed)

VRM

0.375NM

0.550NM

Active marker is

circumscribed.

Range to

No. 1 VRM

Range to

No. 2 VRM

Figure 1-15 How to measure

range by VRM

Measuring range by the variable

range marker (VRM)

Use the Variable Range Markers (VRMs) for

more accurate measurement of the range to

a target. There are two VRMs, No.1 and No.2,

which appear as dashed rings so that you

can discriminate them from the fixed range

rings. The two VRMs can be distinguished

from each other by different lengths of

dashes.

1.19 Measuring Bearing

Use the Electronic Bearing Lines (EBLs) to

find bearing of a target. There are two EBLs,

No.1 and No.2, which are toggled by suc-

cessive presses of the [EBL ON] key. Each

EBL is a straight dashed line extending out

from the own ship position up to the circum-

ference of the radar picture. The fine dashed

line is the No.1 EBL and the coarse dashed

one is the No.2 EBL.

1. Press the [VRM ON] key to display either

of the VRMs. Successive presses of the

[VRM ON] key toggle the active VRM

between No.1 and No.2 and the currently

active VRM readout is circumscribed.

1. Press the [EBL ON] key to display either

of the EBLs. Successive presses of the

[EBL ON] key toggle the active EBL be-

tween No.1, No.2 and index lines (if dis-

played) and the currently active EBL

readout is circumscribed.

2. Rotate the VRM rotary control clockwise

or counterclockwise to align the active

VRM with the inner edge of the target of

interest and read its distance (unit: nm)

at the lower-right corner of the screen.

Each VRM remains at the same geo-

graphical distance when you operate the

[RANGE] key. This means that the appar-

ent radius of the VRM ring changes in

proportion to the selected range scale.

2. Rotate the EBL rotary control clockwise

or counterclockwise until the active EBL

bisects the target of interest, and read its

bearing at the lower-left corner of the

screen.

3. Press the [EBL OFF] key to erase each

EBL.

3. Press the [VRM OFF] key to erase each

VRM.

The EBL readout is affixed by “R” (relative) if

it is relative to own ship’s heading, or “T” (true)

if it is referenced to the North, as determined

by the item EBL/VRM on the OTHER menu.

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If relative motion is selected, it is also

possible to read CPA (Closest Point of

Approach) by using a VRM as shown in

Figure 1-17(a). If the EBL passes through

the sweep origin (own ship) as illustrated

Figure 1-17(b), the target ship is on a

collision course.

Range and bearing

to cursor

Target

Cursor

0.55 NM

15.0°R

No. 2 EBL

(dashed)

5. To return the EBL origin to the own ship

position, press the [EBL OFFSET] key

again.

EBL

45.5°R

314.0°R

Bearing to

No. 1 EBL

Bearing to

No. 2 EBL

No. 1 EBL

(dotted)

Cursor

Active marker is

circumscribed.

Figure 1-16 How to measure

bearing by EBL

A¹

No.1

VRM

No.1

EBL

1.20 Collision Assessment by

the Offset EBL

VRM

3.85NM

EBL

140.0°R

(a) Evaluating target ship’s course and

CPA in relative motion mode

The origin of the EBL can be placed any-

where with the trackball to enable measure-

ment of range and bearing between any

targets. This function is also useful for as-

sessment of the potential risk of collision.

Cursor

A¹

No.1

EBL

To assess possibility of collision:

1. Press the [EBL ON] key to display or ac-

tivate EBL No.1.

2. Place the cursor (+) on a target of inter-

est (A in the illustrated example) by oper-

ating the trackball.

VRM

0.00nm

EBL

118.2°R

(b) Target ship on collision course

3. Press the [EBL OFFSET] key, and the

origin of the active EBL shifts to the cur-

sor position. Press the [EBL OFFSET] key

again to anchor the EBL origin.

Figure 1-17 How to assess risk of collision

1.21 Measuring Range and

Bearing Between Two

Targets

4. After waiting for a few minutes (at least 3

minutes), operate the EBL rotary control

until the EBL bisects the target at the new

position (A’). The EBL readout shows the

target ship’s course, which may be true

or relative depending on the settings on

the OTHER menu.

1. Press the [EBL ON] key to activate the

No. 1 EBL. Press the [EBLOFFSET] key,

and place the origin of the No.1 EBL on a

target of interest (target 1 in Figure 1-18)

by operating the trackball.

2. Turn the EBL rotary control until the EBL

passes through another target of interest

(target 2 in Figure 1-18).

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3. Turn the VRM rotary control until the

range marker on the No. 1 EBL aligns with

target 2 in Figure 1-18. The active VRM

readout at the lower-right corner of the

screen indicates the distance between the

two targets.

Note: The target alarm is given to targets

having a certain level of echo strength. This

level does not always imply a landmass, reef,

ships or other surface objects but can mean

returns from the sea surface or precipitation.

Properly adjust the GAIN, A/C SEA, and A/C

RAIN controls to reduce noise to avoid gen-

eration of the guard alarm against false tar-

gets.

4. To return the EBL origin to the own ship

position, press the [EBL OFFSET] key

again.

The zone has a fixed width of 0.5 nm in the

radial direction (depth) and is adjustable only

within 3.0 to 6.0 nm from own ship. The outer

and inner boundaries can be set at any dis-

tance. The sector of the zone can be set any-

where between 0 and 360 degrees in any

direction.

You can repeat the same procedure on third

and fourth targets by using the No.2 EBL and

No.2 VRM.

Bearing is shown relative to own ship with

suffix “R” or as a true bearing with suffix “T”

depending on EBL relative/true settings on

the OTHER menu.

To set target alarm zones:

1. Press the [MENU] key.

No. 1 EBL

No. 1 VRM

2. Press the [3] key twice to show the TGT

ALARM menu.

TGT ALARM

EBL

80.0 R

VRM

0.50NM

1. AREA

NO1 NO2

2. MODE1

3. MODE2

OUT

Range between

target A and

target B

Bearing from target A

to target B

Figure 1-19 TGT ALARM menu

Figure 1-18 Measuring range and bearing

between two targets

2. Press the [1] key to select target alarm

zone to use; NO1 or NO2.

3. Press the [ENTER/SELECT] key.

4. Press the [MENU] key.

1.22 Setting a Target Alarm Zone

5. Place the cursor (+) at point “A” (see fig-

ure below) using the trackball. Press the

[GZ ALARM] key. GZ1 (or GZ2) SET ap-

pears. When both alarms are prepared

the active alarm is circumscribed.

CAUTION

The target alarm feature should never be

relied upon as the sole means for detecting

the risk of potential collision. The operator

of a ship is not relieved of the responsibility

to keep lookout for avoiding collisions,

whether or not the radar is in use.

6. Move the cursor (+) to point “B” and press

the [GZALARM] key again. Then, an echo

watch zone as illustrated is created and

the label IN (or OUT) replaces SET at the

lower-right corner of the screen.

The target alarm serves to alert the naviga-

tor to targets (ships, landmasses, etc.) en-

tering a certain area, with visual and audible

alarms.

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outward target alarm is produced when a tar-

get leaves the target alarm zone. (This is not

a target alarm by definition but some users

find this feature valuable.)

Target alarm

zone

Dashed line: No alarm.

Alarm sounds when target

violates alarm setting.

Target alarm

zone

INWARD ALARM

OUTWARD ALARM

Figure 1-20 Target alarm

Figure 1-21 Inward and outward alarms

Note: If you wish to create a target alarm

zone having a 360-degree coverage around

own ship, set point “B” in almost the same

direction (approx. ±3°) as point “A” and press

the [GZ ALARM] key.

1.23 Off-centering (shift)

Own ship position, or sweep origin, can be

displaced to expand the view field without

switching to a larger range scale. The sweep

origin can be off-centered to a point speci-

fied by the cursor, up to 75% of ranges other

than 72, 96 and 120 nm.

Two alarm zones can be set as described

above. To change the active alarm zone, do

steps 1 thru 4 in the above procedure. (When

both alarms are prepared the active alarm is

circumscribed.)

This feature is not available on the longest

range scale or in the true motion mode. The

number of range rings increases keeping the

original range intervals unchanged.

Acknowledging alarm

A target entering the target alarm zone pro-

duces both visual (flashing) and audible

(beeping) alarms. To silence the audible

alarm, press the [AUDIO OFF] key shortly.

ACK replaces IN (or OUT).

To off center the radar picture:

1. Place the cursor at a position where you

wish to move the sweep origin by operat-

ing the trackball.

This will deactivate the audible alarm but will

not stop the flashing of the target in the guard

alarm zone. To reactivate the audible alarm,

press the [GZ ALARM] key again.

2. Press the [SHIFT] key. Then, the sweep

origin is off-centered to the cursor posi-

tion. However, the heading line is left in

the same position.

To silence the audible alarm, you may press

the [AUDIO OFF] key. However, in this case,

the label ACK does not appear.

3. To cancel off-centering, press the [SHIFT]

key again.

Deactivating target alarm zone

Hold the [GZ ALARM] key depressed for at

least 5 seconds.

Cursor

Inward and outward alarms

(b) Press SHIFT

key to offcenter.

(a) Select location

with cursor.

The inward target alarm generates visual and

audible warnings when a target enters the

target alarm zone from any direction. The

Figure 1-22 Off-centered display

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Note: The display is automatically shifted by

75% of the range in use whenever the cur-

sor is placed at an edge of the effective dis-

play area.

3. Press the [2] key to select echo averag-

ing level (OFF, 0.5 1, 2, 3) from the ECHO

AVG field.

OFF: No averaging effect

0.5: Distinguishes small targets from

sea clutter.

1.24 Echo Averaging

Distinguishes targets from sea

clutter and suppresses brilliance

of unstable echoes.

The echo average feature effectively sup-

presses sea clutter. Echoes received from

stable targets such as ships appear on the

screen at almost the same position every ro-

tation of the scanner. On the other hand, un-

stable echoes such as sea clutter appear at

random positions.

Distinguishes small stationary

targets such as navigation buoys.

Stably displays distant targets.

4. Press the [ENTER/SELECT] key to con-

clude your selection followed by the

[MENU] key to close the menu.

To distinguish real target echoes from sea

clutter, echo average performs scan-to-scan

correlation. Correlation is made by storing

and averaging echo signals over successive

picture frames. If an echo is solid and stable,

it is presented in its normal intensity. Sea clut-

ter is averaged over successive scans result-

ing in the reduced brilliance, making it easier

to discriminate real targets from sea clutter.

(a) Echo average OFF

(b) Echo average ON

To properly use the echo average function, it

is recommended to first suppress sea clutter

with the A/C SEA control and then do the fol-

lowing:

Figure 1-24 Echo averaging

Echo averaging uses scan-to-scan signal cor-

relation technique based on the true motion

over the ground of each target. Thus, small

stationary targets such as buoys will be

shown while suppressing random echoes

such as sea clutter. True echo average is not

however effective for picking up small targets

running at high speeds over the ground.

1. Press the [MENU] key.

2. Press the [5] key twice to select the ECHO

SIG menu.

ECHO SIG

1. TGT COLOR

2. ECHO AVG

3. INT REJ

YEL GRN COLOR

OFF 0.5 1 2 3

OFF 1 2 3

OFF ON

Echo average requires log and compass sig-

nals. If you wish to use this feature without a

compass signal, consult a FURUNO repre-

sentative.

4. N REJ

5. ENHANCE

6. 2ND ECHO

7. CONTRAST

OFF ON

Manual speed entry is done at the menu item

MAN SPD on the OTHER menu, which is ac-

cessed by pressing the [MENU] and [0]

(twice) keys.

1 2 3

8. CLTR SWEEP OFF ON(LINK) ON(FIX)

9. SWEEP LVL 1 2 3

0. CNTR ENHANCE OFF ON

Figure 1-23 ECHO SIG menu

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Plotting a target

1.25 Electronic Plotting Aid (EPA)

1. Place the cursor on a target of interest by

operating the trackball.

10 operator-selected targets can be plotted

electronically to assess their motion trend.

Five past positions can be displayed for each

of the plotted targets. If you enter a 6th plot

on a certain target, the oldest plot (past posi-

tion) will be erased.

2. Press the [ACQ] key.Aplot symbol (circle)

and target number (0-9) appears on the

target.

3. Watching the EPA time shown at the right

side of the screen, wait for at least 30

seconds. Place the cursor (+) on the plot

symbol with number and then press the

[ENTER/SELECT] key. The symbol shape

changes from circle to square and the

target number in the data display flashes.

A vector appears when you enter a second

plot for the target and is updated each time a

new plot is entered. The vector shows the

target motion trend based on its latest two

plots.

Target data is shown in the data display area

which shows range, bearing, course, speed,

CPAand TCPAof the last-plotted or selected

target.

4. While the target number is flashing, place

the cursor on the target and press the

[ACQ] key. The plot symbol moves to the

new target position and the previous po-

sition is marked by a small dot.

Target data

Plotting time

5. To acquire other targets, repeat the above

steps selecting different plot symbols.

000

350

010

020

RNG

BRG

CRS

SPD

CPA

TPCA

340

330

030

320

040

TRUE VECTOR

30sec

310

050

060

070

080

See note

below.

300

290

280

6. If the target echo separates from its plot

symbol, repeat steps 3 an 4.

00:25

See note

below.

090

100

270

260

Note: If a target once plotted is not plotted

again within 10 minutes, the warning “UP-

DATE PLOT” and Plot No. will appear on the

upper right margin of the screen and the plot

symbol of the target flashes. If you want to

continue plotting this target, reacquire it within

five minutes. Otherwise, the target will be re-

garded as a “lost target” and its plot symbol

and target data will be erased. The larger the

plotting interval, the less accurate the plot-

ted target data. Plotting of each target should

normally be made every 3 or 6 minutes as

far as possible. You can use the Time Alarm

to warn yourself every 3 or 6 minutes.

250

240

110

120

130

Echo Watch Zone

230

220

140

210

150

200

160

190

170

180

EPA symbols

: Target plotted

: Target plotted and data

indicated.

: Target on a collision course

Note:

Target 2 is on a collision course as the extension

of its vector goes through the own ship position.

Placing the offset EBL will help for assessment.

TCPA is counted up to 99.59 min and beyond

that it is indicated as TCPA > 99.59 MIN.

Figure 1-25 EPA display

Within 30 seconds, you can cancel a last plot

by the [CANCEL/CLEAR] key and make a

re-entry at a different position. After 30 sec-

onds, the last entry is processed to produce

a vector.

Note: The EPA requires speed input (auto-

matic or manual) and a compass signal. The

vector and data are updated on real time be-

tween plot entries, but do not neglect to plot

a new position over a long period of time.

Otherwise, the accuracy will be reduced. Note

that the plots will be lost when the compass

fails; start the plotting exercise again.

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True or relative vector, vector time

Target data

Vectors can be displayed relative to own

ship’s heading (Relative) or with reference

to the North (True). This feature is available

in all presentation modes (compass must be

working correctly). The current vector mode

is indicated at the upper-right corner of the

screen.

The radar calculates motion trends (range,

bearing, course, speed, CPA and TCPA) of

all plotted targets.

In the head-up and head-up true bearing

modes, target bearing, course and speed

shown in the upper-right target data field be-

come true (T) relative to north. The target data

field always displays true bearing, true course

and speed over the ground.

Vector time (or the length of vectors) can be

set to 30 seconds, 1, 3, 6, 15 or 30 minutes

and the selected vector time is indicated at

the upper-right corner of the screen.

Reading the target data

1. Press the [MENU] key followed by the [7]

key twice to select PLOT.

Place the cursor on a plotted target and press

the [ENTER/SELECT] key. Then, the follow-

ing target data is displayed at the right side

of the CRT.

PLOT MENU 1

1. MARK DISP

2. ERASE

OFF ON

RNG/BRG (Range/Bearing): Range and

bearing from own ship to last-plotted target

with suffix “T” (True).

3. VEC REF

4. VEC TIME

REL TRUE

30S 1M 3M

15M 30M

5. CPA SET

OFF 0.5NM 1NM 1.5NM

CSE/SPD (Course/Speed): Course and

speed are displayed for the last-plotted tar-

get with suffix “T” (True).

2NM 3NM

5NM 6NM

4NM

6. TCPA SET

30S 1M 2M 3M

5M 6M 12M 15M

CPA/TCPA: CPA(Closest Point ofApproach)

is the closest range the target will approach

to own ship. TCPA is the time to CPA. Both

CPA and TCPAare automatically calculated.

TCPA is counted up to 99.59 min and be-

yond that it is indicated as TCPA > *99.59

MIN.

7. TRACK

8. AUDIO ALARM

9. INTVAL*

0. ↓*

OFF ON

30S 1M 2M 3M 6M

* Requires ATA Board ARP-17.

Figure 1-26 PLOT menu

Terminating target plotting

2. Press the [3] key to select REL or TRUE

from the VECT REF field as appropriate,

and then press the [ENTER/SELECT]

key.

With the EPA you can plot up to 10 targets.

You may wish to terminate plotting of less

important targets to newly plot other threat-

ening targets.

3. Press the [4] to select appropriate vector

time from the VEC TIME field, and then

press the [ENTER/SELECT] key.

With Trackball: Place the cursor (+) on a

target which you do not want to be tracked

any longer by operating the trackball and

press the [CANCEL/CLEAR] key.

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

The vector tip shows an estimated position

of the target after the selected vector time

elapses. It can be valuable to extend the vec-

tor length to evaluate the risk of collision with

any target.

All Targets: To terminate plotting of all tar-

gets at once:

1. Press the [MENU] key followed by the [7]

key twice.

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2. Press the [2] key twice to select OFF from

the ERASE field.

PLOT MENU 1

OFF ON

1. MARK DISP

2. ERASE

3. Press the [ENTER/SELECT] key followed

by the [MENU] key.

3. VEC REF

4. VEC TIME

REL TRUE

30S 1M 3M

15M 30M

5. CPA SET

OFF 0.5NM 1NM 1.5NM

Setting CPA/TCPA alarm ranges

2NM 3NM

5NM 6NM

4NM

When the predicted CPA of any target be-

comes smaller than a preset CPAalarm range

and its predicted TCPA less than a preset

TCPA alarm limit, the EPA releases an au-

dible alarm and displays the warning label

COLLISION appears on the screen. In addi-

tion, the EPA symbol changes to a triangle

and flashes together with its vector.

6. TCPA SET

30S 1M 2M 3M

5M 6M 12M 15M

7. TRACK

8. AUDIO ALARM

9. INTVAL*

0. ↓*

OFF ON

30S 1M 2M 3M 6M

* Requires ATA Board ARP-17.

Figure 1-27 PLOT menu

Provided that this feature is used correctly, it

will help prevent the risk of collision by alert-

ing you to threatening targets. It is important

that GAIN, A/C SEA, A/C RAIN and other

radar controls are properly adjusted.

3. Press the [5] key for CPA SET or [6] key

for TCPA set.

4. Press the [5] key or [6] key again to se-

lect CPA or TCPA range desired.

CPA/TCPAalarm ranges must be set up prop-

erly taking into consideration the size, ton-

nage, speed, turning performance and other

characteristics of own ship.

5. Press the [ENTER/SELECT] key to reg-

ister your selection.

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

CAUTION

Silencing CPA/TCPA audible alarm

CPA/TCPA Alarm

Press the [AUDIO OFF] key to acknowledge

and silence the CPA/TCPA aural alarm.

The CPA/TCPA alarm feature should never

be relied upon as the sole means for detect-

ing the risk of collision.

The navigator is not relieved of the respon-

sibillity to keep visual lookout for avoiding

collisions, whether or not the radar or other

plotting aid is in use.

The flashing of the triangle plot symbol and

vector remain on the screen until the dan-

gerous situation is gone or you intentionally

terminate tracking of the target by using the

trackball.

Lost target alarm

To set the CPA/TCPA alarm ranges:

1. Press the [MENU] key.

When the system detects a lost target, track-

ing on the target is discontinued and the tar-

get symbol becomes a flashing diamond. The

normal plotting symbol is restored to the tar-

get when the target is manually acquired. If

not reacquired the flashing diamond is auto-

matically erased. To confirm a lost target,

place the cursor on it and press the [CAN-

CEL/CLEAR] key.

2. Press the [7] key twice to display the

PLOT menu.

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ments in accordance with their over-the-

ground speeds and courses.

Past plot points

Past plot points may be marked on the dis-

play with as many as nine dots. You can turn

this display on/off as follows:

1. Press the [MENU] key.

2. Press the [7] key twice to select PLOT.

PLOT MENU 1

1. MARK DISP

2. ERASE

OFF ON

a) True target trails-no smearing

of stationary targets

3. VEC REF

4. VEC TIME

REL TRUE

30S 1M 3M

15M 30M

5. CPA SET

OFF 0.5NM 1NM 1.5NM

2NM 3NM

5NM 6NM

4NM

6. TCPA SET

30S 1M 2M 3M

5M 6M 12M 15M

7. TRACK

8. AUDIO ALARM

9. INTVAL*

0. ↓*

OFF ON

30S 1M 2M 3M 6M

b) Relative target trails-all targets

moving relative to own ship

* Requires ATA Board ARP-17.

Figure 1-29 Target trails

Figure 1-28 PLOT menu

Note: When relative trail on the TM mode,

3. Press the [7] key to select OFF or ON from

the TRACK field as appropriate.

the legend REL TRAIL appears in red.

To select true or relative target trail presen-

tation:

4. Press the [ENTER/SELECT] key to reg-

ister your selection followed by the

[MENU] key to close the menu.

1. Press the [MENU] key.

2. Press the [2] key twice to show the TGT

TRAIL menu.

1.26 Target Trails (Echo Trails)

TGT TRAIL

1. TIME

15S 30S 1M 3M

6M 15M 30M CONT

REL TRUE

It is possible to display the trails of the radar

echoes of targets in the form of synthetic af-

terglow. Target trails are selected either rela-

tive or true and may be sea or ground

stabilized. The simulated afterglow can be se-

lected in a single tone or gradual shading de-

pending on a setting on the TGTTRAILmenu.

Note that afterglow is shown in light yellow

when the echo color is green.

2. MODE

3. SHADE

MONO MULTI

4. LEVEL

2 3

5. TRAIL COPY

6. THIN TRAIL

7. THIN MODE

OFF ON

2 3 4

Figure 1-30 TGT TRAIL menu

True or relative trails

3. Press the [2] key several times to select

REL or TRUE from the MODE field as

appropriate.

You may display target trails relative to north

or own ship heading in Relative Motion. True

motion trails require a compass signal and

own ship speed input to cancel out own ship’s

movement and present true target move-

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4. Press the [ENTER/SELECT] key to con-

firm your selection, then the [MENU] key

to close the menu.

Selecting trail time

1. Press the [MENU] key.

2. Press the [2] key twice to select TGT

TRAIL.

Trail gradation

TGT TRAIL

Target trails may be shown in monotone or

multitone. Gradual shading paints the trails

getting thinner with time just like the after-

glow on an analog PPI radar.

1. TIME

15S 30S 1M 3M

6M 15M 30M CONT

REL TRUE

2. MODE

3. SHADE

MONO MULTI

4. LEVEL

2 3

Monotone

(Single)

Gradual shading

(Multi)

5. TRAIL COPY

6. THIN TRAIL

7. THIN MODE

OFF ON

Figure 1-31 Monotone and multitone

target trails

2 3 4

Figure 1-33 TGT TRAIL menu

1. Press the [MENU] key.

3. Press the [1] key to select time desired

from the TIME field.

2. Press the [2] key twice to select TGT

TRAIL.

4. Press the [ENTER/SELECT] key and the

[MENU] key in order.

TGT TRAIL

1. TIME

15S 30S 1M 3M

6M 15M 30M CONT

REL TRUE

Restoring trails

2. MODE

3. SHADE

MONO MULTI

Trails are cancelled and restarted whenever

the range is changed. However, you can con-

tinue trails on the same range, without re-

starting, when the range is changed to a next

larger or smaller range scale. Note however

that when the range is changed, only those

target trails within the previous range are

continued; no trails are generated for targets

outside of the previous range.

4. LEVEL

2 3

5. TRAIL COPY

6. THIN TRAIL

7. THIN MODE

OFF ON

2 3 4

Figure 1-32 TGT TRAIL menu

3. Press the [3] key to select MONO or

MULTI from the SHADE field as appro-

priate.

No trail generated

for target not within

previous range

4. Press the [ENTER/SELECT] key and the

[MENU] key in order.

Displaying, erasing target trails

Press the [TGT TRAIL] key to activate or de-

activate the target trails feature. The current

target trail setting is displayed at the upper

right-and corner of the screen.

(b) New range

(a) Previous range

Figure 1-34 How trail copy works

To remove trails from the screen, press the

[TGT TRAIL] with a hit-and-release action.

(Trailing continues off screen with target trail

timer counting). Press the key again to

redisplay the trails.

1. Press the [MENU] key.

2. Press the [2] key twice to select TGT

TRAIL.

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3. Press the [5] key to select ON or OFF from

the TRAIL COPY field as appropriate.

Thin trails

Target trails may be painted with thinner lines

if desired. This can be useful when there are

a lot of targets on the screen.

4. Press the [ENTER/SELECT] key and

[MENU] key in order.

1. Press the [MENU] key.

Resetting target trails

2. Press the [2] key twice to select TGT

TRAIL.

To reset (or clear) the target trail memory, hold

the [TGT TRAIL] key depressed for about 3

seconds. Target trails are cleared and the

trailing process restarts from time count zero

at current target trail plot interval. Note that

target trails are also restarted when the shift

feature is turned on or the range is changed.

3. Press the [6] key to show THIN TRAIL ON

or OFF as appropriate.

4. Press the [7] key to select 1, 2, 3 or 4 as

appropriate. When there are a lot of tar-

gets on the screen, select a larger num-

ber (for thinner trails); select a smaller

number when there are few targets. The

default setting is 1.

Trail brilliance

The brilliance of target trails can be adjusted

on the BRILL menu as follows:

5. Press the [ENTER/SELECT] key and

[MENU] key in order.

1. Press the [MENU] key.

Trail afterglow

2. Press the [9] key twice to display the

BRILL menu.

The strength of the synthetic afterglow to re-

main on the display may be selected as fol-

lows:

BRILL

1. TGT TRAIL

2. CHARACTER

3. HDG LINE

4. EBL/VRM

5. CURSOR

6. MARK

1. Press the [MENU] key.

2. Press the [2] key twice to select TGT

TRAIL.

3. Press the [4] key to select desired level

from the LEVEL field; “3” displays only the

highest level of afterglow.

7. PLOT

8. OS SYMB

9. ↓*

4. Press the [ENTER/SELECT] key and

[MENU] key in order.

* Requires RP-17 Board.

Figure 1-35 BRILL menu

3. Press the [1] key twice to select TGT

TRAIL.

4. Operate the VRM rotary control to adjust

brilliance. Current brilliance is shown by

the BRILL bar graph at the top right-hand

corner of the screen.

5. Press the [ENTER/SELECT] key to con-

clude your selection followed by the

[MENU] key to close the menu.

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To use the origin mark:

1.27 Parallel Index Lines

1. Place the cursor (+) at a point where you

want to place a reference mark by oper-

ating the trackball.

Parallel index lines are useful for keeping a

constant distance between own ship and a

coastline or a partner ship when navigating.

The orientation of the index lines is controlled

with the EBL rotary control and the intervals

between the lines adjusted with the VRM ro-

tary control (provided that No.2 VRM is ac-

tive).

2. Press the [MARK] key. The origin mark

appears at the cursor position, of which

range and bearing are indicated at the

upper-right section of the screen.

Origin mark reference

The origin mark can be set relative to own

ship (relative), or referenced to land (sea or

ground stabilized).

Index lines

1. Press the [MENU] key.

2. Press the [8] key twice to select MARK.

MARK

Figure 1-36 Index lines

1. ERASE

2. MODE

REL TRUE

Displaying/erasing the index lines

Figure 1-37 MARK menu

Press the [INDEX LINE] key to display/erase

the index lines. Each press of the key turns

the parallel index lines on (enabling adjust-

ment by VRM, EBL), fixes them on the dis-

play or turns them off.

3. Press the [2] to select the REL or TRUE

from the MODE field as appropriate.

4. Press the [ENTER/SELECT] key.

5. Press the [MENU] key.

Selecting number of index lines to

display

Erasing origin marks

Erasing individual origin marks

Maximum number of the index lines can be

set for 2 or 6 on the MARK/LINE in the

OTHER menu.

Select the origin mark with the cursor and

then press the [CANCEL/CLEAR] key.

Erasing all origin marks

1.28 Origin Mark

1. Press the [MENU] key.

You can mark any reference points, promi-

nent target or a point of particular interest us-

ing the origin mark feature. This mark is

geographically fixed, namely, ground stabi-

lized. Twenty such origin marks can be en-

tered. This function is not available when the

RP-17 board is installed.

2. Press the [8] key twice to select MARK.

3. Press the [1] key twice.

4. Press the [MENU] key.

1-25

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Temporarily erasing heading line, north

marker, stern marker, own ship symbol

1.29 Zoom

The zoom function is useful for enlarging an

area of interest as large as twice the normal

viewing. This performs the range scale re-

duction to a half and the offset at the same

time. Zoom can be used on ranges other than

0.125, 72, 96, 120 nm.

To temporarily extinguish the heading line,

north marker, stern marker and own ship sym-

bol to look at a target which may be obscured

by those markers, press the GAIN control (HL

OFF control). The heading line, north marker,

stern marker and own ship symbol reappear

when the control is released. Note that the

RP screen is also temporarily erased when

the RP-17 is connected.

1. Place the cursor (+) close to the point of

interest by operating the trackball.

2. Press the [ZOOM] key. The area around

the cursor and own ship is enlarged twice

as large as the original size.

North marker

3. To cancel zoom, press and hold down the

[ZOOM] key about two seconds.

The north marker appears as a short dashed

line. In the head-up mode, the north marker

moves around the bearing scale in accor-

dance with the compass signal.

Note: The zoom feature is inoperative when

the display is off centered.

Stern marker

The stern marker (a dot-and-dash line) ap-

pears opposite to the heading line. It can be

displayed/erased on the item MARK/LINE in

the OTHER menu.

Cursor

Own ship symbol

(b) Press ZOOM

key to zoom in.

(a) Cursor placed at

point of interest

The own ship symbol appears at own ship

position. It can be displayed/erased on the

item MARK/LINE in the OTHER menu. The

symbol is scaled to indicate length and beam

of the vessel. If the largest dimension of the

symbol gets smaller than 6 nm, the symbol

will disappear and own ship will be repre-

sented by a small dot or circle. The size of

the symbol is set at installation.

Figure 1-38 Zoom

1.30 Markers

Heading line

The heading line indicates the ship’s head-

ing in all presentation modes, and is a line

from the own ship position to the outer edge

of the radar display area and appears at zero

degrees on the bearing scale in head-up

mode, it changes the orientation depending

on the ship orientation in the north-up and

true motion modes.

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4. Select desired function with the VRM ro-

tary control.

1.31 User Keys (F1, F2, F3)

The user keys [F1], [F2] and [F3] may be pro-

grammed by the operator to display a desired

menu. For example, you can program the [F2]

key to select target trail time whenever the

key is pressed.

5. Press the [ENTER/SELECT] key to reg-

ister your selection, and then press the

[MENU] key to finish.

Activating a user-defined key

The default settings are [F1], echo averag-

ing; [F2], echo stretch and [F3], clutter sweep.

Press a user key. Press the key again to se-

lect option desired.

Presetting the user keys

1. Press the [MENU] key.

1.32 Function Keys

2. Press the [6] key twice to display the

FUNC menu.

The function keys work similar to the auto-

matic dialing feature on a telephone, playing

back control settings just as they were regis-

tered. Instead of manually adjusting controls

to set up for a particular condition, for ex-

ample, navigation in a harbor, you can have

a function key do it for you.

FUNC

1. FUNC1

2. FUNC2

3. F•1

4. F•2

5. F•3

Each function key can be assigned a combi-

nation of particular radar settings that will be

most suited to a specPic navigation purpose,

and an adhesive-backed label (such as

OCEAN, COAST) is usually attached to the

keytop for easy identification of the assigned

purpose.

6. A/D CURVE A B C D

Figure 1-39 FUNC menu

3. Press [3], [4], or [5] key twice depending

on which user key you want to set. For

example, press the [4] key to program the

[F2] key.

[F•2 MENU]

Presetting the function keys

1. TRAIL TIME

26. HUTB MODE

27. TUNE A/M

28. EXT WP

2. TRAIL MODE

3. TRAIL SHADE

4. TRAIL LEVEL

5. ALARM AREA

6. ALARM MODE

7. PANEL DIMMER

8. TGT COLOR

9. ECHO AVG

The radar’s internal computer offers several

navigation setups as outlined in the table on

the next page. For instance, you might want

to select RAIN as the objective of a function

key. Then, when you press that function key

the radar will be instantly set up to operate

under heavy rain conditions.

29. OS POSN

30. CURS BRG

31. EBL1 T/R

32. EBL2 T/R

33. CURS RNG

34. VRM1 RNG

35. VRM2 RNG

36. CLTR SWEEP

37. MARK MENU

38. DISP MODE

39. A/D CURVE

40. ORIGIN MARK

41. DEST ON CSR

10. INT REJ

11. ECHO STRETCH

12. NOISE REJ

13. ECHO ENHANCE

14. 2ND ECHO

15. CONTRAST

16. PLOT MENU

17. MARK MODE

18. BRILL MENU

19. DRIFT MENU

20. NAV DATA

21. DISPLAY

Each setup option defines a combination of

several radar settings for achieving optimum

setup for a particular navigating situation.

Those involved are interference rejector, echo

stretch, echo average, automatic anti-clutter,

noise rejector, video contrast, and enhanced

video.

22. SART

23. TIME ALARM

24. STERN MARK

25. OS MARK

Select by VRM knob

and hit ENTER key.

37 and 38 shown with connection of RP-17.

Figure 1-40 Function menu

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2. Press [1] or [2] key twice to select func-

tion to program. For example, press the

[1] key to program FUNC1. The following

menu appears.

Adjusting these features on a function key

menu changes the original function key set-

tings. To restore the original settings for a

particular function key, it is necessary to dis-

play the relevant function key menu and se-

lect appropriate menu options.

FUNC 1 MENU

1. ↑

Table 1-2 FUNC key objectives

2. FUNC SEL

COAST OCEAN

R-SEA RAIN

Label

Description

BIRD-N BIRD-F

COAST

Optimum setting for short range

detection using a range scale

between 1.5 and 6 nm on calm

seas.

3. ECHO AVG

4. INT REJ

OFF 0.5

OFF 1

5. STRETCH

6. N REJ

OFF 1

OCEAN

R-SEA

RAIN

Optimum setting for long range

detection using a range scale

between 6 and 24 nm.

OFF ON

OFF 1

7. ENHANCE

8. CONTRAST

9. A/C AUTO

Optimum setting for heavy seas

usng a range scale between 3

and 12 nm.

OFF ON

Optimum setting for heavy rain

conditions using a range scale

between 6 and 24 nm.

Figure 1-42 FUNC1 menu

3. Press the [2] key twice to select function

desired.

BIRD-N

BIRD-F

Optimum setting for detecting

birds using a range scale

between 3 and 8 nm.

4. Change other functions (echo avg, int rej,

etc.) if necessary.

Optimum setting for detecting

birds using a range scale

between 16 and 24 nm.

5. Press the [ENTER/SELECT] key to reg-

ister your selection followed by the

[MENU] key to close the menu.

1. Press the [MENU] key followed by the [6]

key twice to display the FUNC menu.

FUNC

1. FUNC1

2. FUNC2

3. F•1

4. F•2

5. F•3

6. A/D CURVE A B C D

Figure 1-41 FUNC menu

Table 1-3 Default function key settings

Default Function Key Settings

Label

3. ECHO 4. INT 5. STRETCH 6. N REJ 7. ENHANCE 8. CON- 9. A/C

AVG

REJ

TRAST

A/UTO

OFF

COAST

OCEAN

R-SEA

RAIN

OFF

0.5

OFF

BIRD-N

BIRD-F

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1.33 Suppressing Second-trace

Echoes

1.34 Adjusting Brilliance of

Screen Data

In certain situations, echoes from very dis-

tant targets may appear as false echoes (sec-

ond-trace echoes) on the screen. This occurs

when the return echo is received one trans-

mission cycle later, that is, after a next radar

pulse has been transmitted.

You can adjust relative brilliance levels of

various marks and alphanumeric readouts

displayed on the screen as follows:

1. Press the [MENU] key.

2. Press the [9] key twice to show the BRILL

menu.

To activate or deactivate the second-trace

echo rejector:

BRILL

1. TGT TRAIL

2. CHARACTER

3. HDG LINE

4. EBL/VRM

5. CURSOR

6. MARK

1. Press the [MENU] key followed by the [5]

key twice to display the ECHO SIG menu.

ECHO SIG

1. TGT COLOR

2. ECHO AVG

3. INT REJ

YEL GRN COLOR

OFF 0.5 1 2 3

OFF 1 2 3

OFF ON

7. PLOT

4. N REJ

8. OS SYMB

9. ↓*

5. ENHANCE

6. 2ND ECHO

7. CONTRAST

OFF ON

* Requires RP-17 Board.

1 2 3

Figure 1-44 BRILL menu

8. CLTR SWEEP OFF ON(LINK) ON(FIX)

9. SWEEP LVL

3. Press appropriate numeric key twice to

select item to adjust. For example, press

the [1] key if you want to change the bril-

liance of target trails.

0. CNTR ENHANCE OFF ON

Figure 1-43 ECHO SIG menu

2. Press the [6] key to select OFF or ON from

the 2ND ECHO field as appropriate.

4. Operate the VRM rotary control to adjust

brilliance. Current brilliance level is dis-

played on the selected item’s bar graph.

The adjustment range is as follows;

3. Press the [ENTER/SELECT] key to con-

clude your selection followed by the

[MENU] key to close the menu.

1. ECHO TRAIL: 10%-50%

2. CHARACTER, 3. HDG LINE: 50%-

100%

4. EBL/VRM, 5. CURSOR, 6. MARK,

7. PLOT, 8. OS SYMB: 0%-100%

5. Press the [ENTER /SELECT] key to con-

clude your selection followed by the

[MENU] key to close the menu.

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2. Press the [2] key to select desired interval

(3, 6, 12, 15, 20 min) from the ALM INTVL

field.

1.35 Noise Rejector

The noise rejector suppresses white noise,

which appears on the screen as many dots

scattered randomly over the display.

3. Press the [ENTER/SELECT] key to con-

clude your selection followed by the

[MENU] key to close the menu.

To suppress white noise:

1. Press the [MENU] key.

1.37 Enhanced Video

2. Press the [5] key twice to show the ECHO

SIG menu.

On long ranges target echoes tend to shrink

in the bearing direction, making them difficult

to see. On short and medium ranges such as

1.5, 3 and 6 nm scales, the same size targets

get smaller on screen as they approach the

own ship. These are due to the inherent prop-

erty of the radiation pattern of the antenna.

To enhance target video, use the enhanced

video function. It enlarges target echoes in

bearing and range direction on 1.5-6 nm

scales.

ECHO SIG

1. TGT COLOR

2. ECHO AVG

3. INT REJ

YEL GRN COLOR

OFF 0.5 1 2 3

OFF 1 2 3

OFF ON

4. N REJ

5. ENHANCE

6. 2ND ECHO

7. CONTRAST

OFF ON

1 2 3

8. CLTR SWEEP OFF ON(LINK) ON(FIX)

9. SWEEP LVL

0. CNTR ENHANCE OFF ON

1. Press the [MENU] key followed by the [5]

key twice to show the ECHO SIG menu.

Figure 1-45 ECHO SIG menu

3. Press the [4] to select OFF or ON from

the N REJ field as appropriate.

ECHO SIG

1. TGT COLOR

2. ECHO AVG

3. INT REJ

YEL GRN COLOR

OFF 0.5 1 2 3

OFF 1 2 3

OFF ON

4. Press the [ENTER/SELECT] key to con-

clude your selection followed by the

[MENU] key to close the menu.

4. N REJ

5. ENHANCE

6. 2ND ECHO

7. CONTRAST

OFF ON

1 2 3

1.36 Time Alarm

8. CLTR SWEEP OFF ON(LINK) ON(FIX)

9. SWEEP LVL

The time alarm gives an aural at a predeter-

mined interval.

0. CNTR ENHANCE OFF ON

To silence the alarm, press the [AUDIO OFF]

key. The label T-ALM turns to normal color

and the timer is reset to initial value and starts

the count-down sequence again.

Figure 1-47 ECHO SIG menu

2. Press the [5] key to select OFF or ON from

the ENHANCE field.

To activate the time alarm:

3. Press the [ENTER/SELECT] key, and then

press the [MENU] key.

1. Press [MENU], [0] twice and [4] twice to

display the TIME ALARM.

TIME ALARM

1. ↑

2. ALARM INTV

OFF 3M 6M

12M 15M 20M

Figure 1-46 TIME ALARM menu

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4. Press the [2] key to select desired de-

gaussing interval (OFF, 1, 5, 10 min) from

the DEGS INTV field, and then press the

[ENTER/SELECT] key.

Echo enlarged in bearing

and range directions

5. Press the [3] key to select desired de-

gaussing degree (45°, 90°, 135°) from the

DEGS DEG field. For example, selecting

45° will automatically degauss the screen

when the ship makes a turn which is be-

tween 45° and 89°.

Figure 1-48 How the enhance

function works

6. Press the [ENTER/SELECT] key followed

by the [MENU] key.

Note: Enhanced video can also be selected

with a user key.

1.39 Navigation Data

1.38 Degaussing Interval

Various navigation data can be displayed

(and their format selected) with connection

of appropriate external sensors. You can se-

lect which navigation data to display as fol-

lows:

The screen is degaussed automatically at

certain time intervals, as well as each time

the radar is turned on, to demagnetize the

CRT screen to eliminate color contamination

caused by earth’s magnetism or magnetized

ship structure. You can select the degauss-

ing interval and the degaussing degree as

follows:

1. Press the [MENU] key, and then the [0]

key twice show the OTHER menu.

2. Press the [8] key twice to select display

the NAV DATA menu.

3. Press appropriate numeric key to turn

data on/off, select format, etc. Press the

[ENTER/SELECT] key after setting each

option. Water temperature and depth dis-

plays are off in the default setting.

1. Press the [MENU] key followed by the [0]

key twice to select OTHER.

2. Press the [0] key twice to select the

OTHER menu.

OTHER

1. ↑

Note 1: OFF in the OS POSN field simply

erases own ship position data; it does not

stop input of nav data from a navigation

device.

2. TEST

3. DEGAUSS

4. TIME ALARM

5. RANGE

Note 2: TIME DIF selects time system to

use; UTC or LOCAL. UTC = Local + Time

Dif.

6. INSTALL

Figure 1-49 OTHER menu

4. Press the [MENU] key.

3. Press the [3] key twice to display the DE-

GAUSS menu.

All navigation data may be turned on/off by

the keying sequence of [MENU], [0] (twice)

and [5].

DEGAUSS

1. ↑

2. DEGS INTV

OFF 30S 1M 2M

3. DEGS DEG

OFF 45° 90° 135°

Figure 1-50 DEGAUSS menu

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3. Press the [8] key to turn on/off the clutter

sweep function, and then press the [EN-

TER/SELECT] key.

1.40 Video Contrast

The video contrast is adjustable in three lev-

els according to the radar video sampling

level. Select the level so that the video con-

trast feature changes the dynamic range of

the video signal to improve picture contrast.

Picture shows up most clearly from the back-

ground.

OFF:

Turns off clutter sweep

feature.

ON(LINK): Sweep area moves with

trackball operation. Sweep

cursor shown by dashed

lines.

ON(FIX): Sweep area is fixed on the

screen. Sweep cursor

1. Press the [MENU] key.

shown by solid lines.

2. Press the [5] key twice to display the

ECHO SIG menu.

4. Press the [9] key (SWEEP LVL) several

times to select level of suppression to use;

“3” provides the highest level of noise sup-

pression.

ECHO SIG

1. TGT COLOR

2. ECHO AVG

3. INT REJ

YEL GRN COLOR

OFF 0.5 1 2 3

OFF 1 2 3

OFF ON

5. Press the [ENTER/SELECT] key to reg-

ister your selection and the [MENU] key

to finish.

4. N REJ

5. ENHANCE

6. 2ND ECHO

7. CONTRAST

OFF ON

6. Operate the trackball to select area to pro-

cess.

OFF ON

1 2 3

8. CLTR SWEEP OFF ON(LINK) ON(FIX)

9. SWEEP LVL

Select area to

process with

square cursor.

0. CNTR ENHANCE OFF ON

Figure 1-51 ECHO SIG menu

3. Press the [7] key to select desired con-

trast level from the CONTRAST field.

4. Press the [ENTER/SELECT] key to reg-

ister you selection and the [MENU] key

to finish.

Figure 1-52 Selection of area to

process with clutter sweep

The clutter sweep feature may also be acti-

vated by a user key.

1.41 Clutter Sweep

The clutter sweep feature suppresses sea

and rain clutters within the trackball-selected

area, to discriminate specific targets from

noise. The user may select the area to pro-

cess and the level of suppression to apply

as follows:

1.42 Outputting Target Position

Target position can be output (in IEC 61162-

1 format) to a video plotter and marked on its

screen with a symbol. Select target with the

trackball and push the A/C RAIN control.

(TLL) This function requires position data and

compass signal.

1. Press the [MENU] key.

2. Press the [5] key twice to select the ECHO

SIG menu.

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3. Press the [5] key twice to select RANGE.

1.43 Background Color

The secondary function of the BRILL control

(BKGND COLOR) is to select the color of the

background, characters, menu, markers and

indications, from the five color combinations

shown in the table below. Each press of the

control selects one of the five color combina-

tions.

RANGE

1. ↑

2. RANGE

1/8 1/4 1/2

3/4 1 1.5 2 3

6 8 12 16

24 32 48 72 96 120

Figure 1-54 RANGE menu

Table 1-4 Available color combinations

4. Press the [2] key to place the underline

under the range scale to select/deselect

and then press the [ENTER/SELECT]

key. Active ranges are highlighted. Repeat

to select/deselect other ranges.

Arrangement

Radar Display

Area

BLK

BLU

BLK

Outside Radar

Display Area

BLK

BLU

BLK

Characters

GRN GRN GRN WHT

RED

5. Press the [MENU] key.

YEL

Menu Highlight

EBL/VRM

Range Rings

Cursor

L-BLU GRN GRN GRN L-BLU

GRN WHT WHT WHT GRN

WHT GRN GRN GRN WHT

GRN WHT WHT WHT GRN

1.45 Selecting Bearing Scale

Format

Heading Line

The bearing scale may be displayed in de-

grees or compass points or degrees as fol-

lows:

Target Alarm

Zone

WHT L-BLU L-BLU L-BLU WHT

North Marker

Stern Marker

WHT L-BLU L-BLU L-BLU WHT

1. Press the [MENU] key.

BLK, Black; BLU, Blue; L-BLU, Light-blue; WHT, White;

GRN, Green, YEL, Yellow

2. Press the [0] key twice to display the

OTHER menu.

3. Press the [6] key twice to display the

MARK/LINE menu.

1.44 Selecting Range Scales

MARK/LINE

1. ↑

Range scales to use may be selected as fol-

lows:

2. INDEX LINES

3. STERN MARK OFF ON

1. Press the [MENU] key.

4. SHIP’S MARK OFF ON

2. Press the [0] key four times to display the

OTHER sub menu.

5. BEARING SCALE

360 COMPASS

Figure 1-55 MARK/LINE menu

OTHER

1. ↑

4. Press the [5] key to select 360 (degrees)

or COMPASS.

2. TEST

3. DEGAUSS

4. TIME ALARM

5. RANGE

5. Press the [ENTER/SELECT] key to reg-

ister your selection and the [MENU] key

to close the menu.

6. INSTALL

Figure 1-53 OTHER sub menu

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1.46 A/D Converter Curve

Setting

1.47 Enlarging Close-in Targets

The center enhance feature enlarges all ech-

oes within the first range on any range.

Video signal threshold level and color output

setting (for the CRT) are executed when the

video signal is converted from analog to digi-

tal. Select the A/D curve according to objec-

tive referring to the table below. The default

setting is A.

1. Press the [MENU] key.

2. Press the [5] key twice to display the

ECHO SIG menu.

3. Press the [0] key to turn CNTR ENHANCE

on or off.

1. Press the [MENU] key.

4. Press the [ENTER/SELECT] key followed

by the [MENU] key.

2. Press the [6] key twice to display the

FUNC menu.

FUNC

1. FUNC1

2. FUNC2

3. F•1

4. F•2

5. F•3

6. A/D CURVE A B C D

Figure 1-56 FUNC menu

3. Press the [6] key to select A/D curve set-

ting, referring to the table below.

4. Press the [ENTER/SELECT] key followed

by the [MENU] key.

Table 1-5 A/D curve settings

A lot of green but Float detection

little red.

Noise is green in Reduce sea reflections

color.

General navigation

Between A and

Normal use: Useful for

target discrimination

Little green but

lot of red.

Long range detection

Buoy detection

Fine noise.

Noise in yellow

and red.

Little green but

lot of red.

Fine noise.

Noise in red.

Long range detection

Buoy detection

Longer range detection

than C

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1.48 Alarms

The table below shows the alarm indications which appear on the display screen.

Table 1-6 Alarms

Fault

Audible alarm

Visual alarm

To quit alarm status

Heading failure

beeps

Heading label reads

"xxx.x° " and the message

Match the on-screen HDG

readout with the actual

"GYRO SIGNAL MISSING" compass reading, if necessary.

appears in red.

To stop audible alarm press

the [AUDIO OFF] key.

Display is automatically

switched to Head-up mode

within 1 min.

Target alarm

Watch alarm

Beeps

Target flashes.

Press [TGT ALARM] key.

(Section 1.22).

WATCH 0:00

Press the [AUDIO OFF] key.

The label WATCH turns to

normal video and the timer is

reset (Section 1.36).

(Label "WATCH TIM" turns

red and time count freezes

at "0:00.").

Own ship lat/lon

Cursor lat/lon

None

"xxx.x" in own ship position Make sure that own ship

field

position data is fed from

external radionav equipment.

"xxx.x" in cursor position

field

System failure

Message "AZI SIGNAL

MISSING" appears. No

radar echoes.

Incorrect

keystroke

Double beep tone None

Correct keystroke is responded

by a single beep provided that

KEY BEEP ON is selected at

installation.

Log failure

2 beeps

LOG "xx.x" and "SLOG

SIGNAL MISSING" appear, Manual Speed mode, or other

If the log has failed, use the

if no log signal is input for

30 sec while own ship

speed has been less than

0.5 kt.

appropriate sensor.

EPFS failure

SOG indication

Continuous beep EPFS in red (EPFS:

Electronic Position-Finding

System). The indication also

appears when the GPS

To silence the beep, press the

[AUDIO OFF] key.

mode is switched between

GPS and DPGS.

None

SOG (in red) appears at

the top right corner when

SOG option is selected on

The radar does not

automatically reset itself to

receive an SOG data even if

the menu but the associated the SDME regains a bottom

SDME fails to detect a

bottom tracking speed and

changes to the "Speed

through the water" (S-WT)

mode automatically.

tracking speed. To erase SOG

indication (red), press [MENU],

[0], [select S-WT], [MENU].

TRUE VECTOR

indication

None

TRUE VECTOR (red)

appears in the second data

cell when the presentation

mode is RM; goes off in the

North-up TM.

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Table 1-6 Alarms (con’t)

Fault

Audible alarm

Visual alarm

To quit alarm status

Video signal

failure

Continuous beep

VIDEO SIGNAL MISSING

appears.

To silence the beep, press the

[AUDIO OFF] key. Buzzer

sounds again when the range

is changed.

Heading line

failure

Continuous beep HL SIGNAL MISSING

appears.

To silence the beep, press the

[AUDIO OFF] key. Buzzer

sounds again when the range

is changed.

EPA plotting

None

UPDATE PLOT informs that Reacquire the flashing target

a target which was once

plotted has not been re-

plotted within 10 minutes.

within 5 min, or disregard the

target if it is not necessary to

track the target.

Target on collision Beeps

course

COLLISION appears when

EPA- or ATA-tracked target terminate tracking of target.

is on collision course.

Take evasive action or

Then, visual indication goes

off.

1.49 Peformance Monitor

The performance monitor (PM-30 for FR-1710/1725, PM-50 for 1760DS) provides an effec-

tive means of general performance check of a radar installation. It works like a transponder.

Installed in the proximity of the radar antenna, it is triggered by part of the transmitted micro-

wave energy and sends back a coded signal to the antenna for display on the radar screen.

Overall performance can be checked from the range, size and number of arcs displayed on

the radar screen. For further details see the operator’s manual of the performance monitor.

To turn on the performance monitor:

1. Press the [MENU] key.

2. Press the [0] key twice to display the OTHER menu.

3. Press the [5] key twice to open the DISPLAY menu.

DISPLAY

1. ↑

2. NAV DATA

3. DISPLAY

4. SART

OFF ON

MAIN SUB

OFF ON

5. P M

Figure 1-57 DISPLAY menu

4. Press the [5] key to select ON or OFF from the P M field as appropriate.

5. Press the [ENTER/SELECT] key followed by the [MENU] key.

When the performance monitor is turned on the radar is automatically set up as follows: IR,

Off; ECHO AVG, Off; ES, Off; A/C AUTO, Off, N REJ, Off, RANGE, 24 nm.

1-36

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RADAR OBSERVATION

For example, if the height of the scanner

above the waterline is 9 meters and the height

of the target is 16 meters, the maximum ra-

dar range is;

2.1 General

Minimum and maximum ranges

Minimum range

R_max= 2.2 x ( 9 + 16 ) = 2.2 x (3 + 4) = 15.4 nm

The minimum range is defined by the short-

est distance at which, using a scale of 1.5 or

0.75 nm, a target having an echoing area of

10 m²is still shown separate from the point

representing the scanner position.

It should be noted that the detection range is

reduced by precipitation (which absorbs the

radar signal).

X-band and S-band

It is mainly dependent on the pulselength,

scanner height, and signal processing such

as main bang suppression and digital quan-

tization. It is a good practice to use a shorter

range scale as far as it gives favorable defi-

nition or clarity of picture. The IMO Resolu-

tion A. 477 (XII) and IEC 936 require the

minimum range to be less than 50 m. All

FURUNO radars satisfy this requirement.

In fair weather, the above equation does not

give a significant difference between X- and

S-band radars. However, in heavy precipita-

tion condition, an S-band radar would have

better detection than an X-band radar.

Radar resolution

There are two important factors in radar

resolution (discrimination): bearing resolution

and range resolution.

Maximum range

The maximum detecting range of the radar,

Rmax, varies considerably depending on sev-

eral factors such as the height of the scan-

ner above the waterline, the height of the

target above the sea, the size, shape and

material of the target, and the atmospheric

conditions.

Bearing resolution

Bearing resolution is the ability of the radar

to display as separate pips the echoes re-

ceived from two targets which are at the same

range and close together. It is proportional

to the scanner length and reciprocally pro-

portional to the wavelength. The length of the

scanner radiator should be chosen for a bear-

ing resolution better than 2.5° (IMO Resolu-

tion). This condition is normally satisfied with

a radiator of 1.2 m (4 ft) or longer in the X-

band. The S-band radar requires a radiator

of about 12 feet (3.6 m) or longer.

Under normal atmospheric conditions, the

maximum range is equal to the radar hori-

zon or a little shorter. The radar horizon is

longer than the optical one by about 6% be-

cause of the diffraction property of the radar

signal. The Rmax is given in the following

equation.

R_max= 2.2 x ( h1 + h2 )

where Rmax: radar horizon (nautical miles)

h1:

h2:

scanner height (m)

target height (m)

Radar horizon

Optical horizon

Figure 2-1 Radar horizon

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Range resolution

2.2 False Echoes

Range resolution is the ability to display as

separate pips the echoes received from two

targets which are on the same bearing and

close to each other. This is determined by

pulselength only. Practically, a 0.08 microsec-

ond pulse offers the discrimination better than

35 m as do so with all FURUNO radars.

Occasionally echo signals appear on the

screen at positions where there is no target

or disappear even if there are targets. They

are, however, recognized if you understand

the reason why they are displayed. Typical

false echoes are shown below.

Test targets for determining the range and

bearing resolution are radar reflectors hav-

ing an echoing area of 10 m².

Multiple echoes

Multiple echoes occur when a transmitted

pulse returns from a solid object like a large

ship, bridge, or breakwater. A second, a third

or more echoes may be observed on the dis-

play at double, triple or other multiples of the

actual range of the target as shown below.

Multiple reflection echoes can be reduced

and often removed by decreasing the gain

(sensitivity) or properly adjusting theA/C SEA

control.

Bearing accuracy

One of the most important features of the ra-

dar is how accurately the bearing of a target

can be measured. The accuracy of bearing

measurement basically depends on the nar-

rowness of the radar beam. However, the

bearing is usually taken relative to the ship’s

heading, and thus, proper adjustment of the

heading line at installation is an important fac-

tor in ensuring bearing accuracy. To minimize

error when measuring the bearing of a tar-

get, put the target echo at the extreme posi-

tion on the screen by selecting a suitable

range.

True

echo

Target

Own ship

Multiple

echo

Range measurement

Figure 2-2 Multiple echoes

Measurement of the range to a target is also

a very important function of the radar. Gen-

erally, there are two means of measuring

range: the fixed range rings and the variable

range marker (VRM). The fixed range rings

appear on the screen with a predetermined

interval and provide a rough estimate of the

range to a target. The variable range marker’s

diameter is increased or decreased so that

the marker touches the inner edge of the tar-

get, allowing the operator to obtain more ac-

curate range measurements.

Sidelobe echoes

Every time the radar pulse is transmitted,

some radiation escapes on each side of the

beam, called “sidelobes.” If a target exists

where it can be detected by the side lobes

as well as the main lobe, the side echoes

may be represented on both sides of the true

echo at the same range. Side lobes show

usually only on short ranges and from strong

targets. They can be reduced through care-

ful reduction of the gain or proper adjustment

of the A/C SEA control.

2-2

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Shadow sectors

Target A

Funnels, stacks, masts, or derricks in the

path of the scanner block the radar beam. If

the angle subtended at the scanner is more

than a few degrees, a non-detecting sector

may be produced. Within this sector targets

can not be detected.

Target B

(Spurious)

Target B

(True)

Figure 2-3 Sidelobe echoes

Virtual image

Radar

antenna

A relatively large target close to your ship may

be represented at two positions on the

screen. One of them is the true echo directly

reflected by the target and the other is a false

echo which is caused by the mirror effect of

a large object on or close to your ship as

shown in the figure below. If your ship comes

close to a large metal bridge, for example,

such a false echo may temporarily be seen

on the screen.

Radar

mast

Shadow sector

Figure 2-5 Shadow sectors

Target ship

Own

ship

2.3 SART (Search and Rescue

Transponder)

A Search and Rescue Transponder (SART)

may be triggered by any X-Band (3 cm) ra-

dar within a range of approximately 8 nm.

Each radar pulse received causes it to trans-

mit a response which is swept repetitively

across the complete radar frequency band.

When interrogated, it first sweeps rapidly (0.4

µs) through the band before beginning a rela-

tively slow sweep (7.5 µs) 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 inter-

rogating 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.

True

echo

Mirror image

of target ship

False

echo

Figure 2-4 Virtual image

2-3

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2. Press the [0] key twice.

When the range to the SART is reduced to

about 1 nm, the radar display may show also

the 12 responses generated during the fast

sweeps. These additional dot responses,

which also are equally spaced by 0.64 nm,

will be interspersed with the original line of

12 dots. They will appear slightly weaker and

smaller than the original dots.

3. Press the [5] key twice select DISPLAY.

DISPLAY

1. ↑

2. NAV DATA

3. DISPLAY

4. SART

OFF ON

MAIN SUB

OFF ON

Screen A: When SART

is distant

Screen B: When SART

is close

Lines of 12 dots

are displayed in

concentric arcs.

Figure 2-8 DISPLAY menu

Echo of SART

24 NM

Radar antenna

beamwidth

4. Press the [4] key several times to select

OFF or ON from the SART field as ap-

propriate.

Echo of

SART

1.5 NM

Position of

SART

5. Press the [ENTER/SELECT] key followed

by the [MENU] key.

Own ship's

position

Own ship's

position

When the SART function is turned on the

range is set to 12 nm, the noise rejector, echo

averaging,AUTOA/C and interference rejec-

tor are turned off, and SART is displayed at

the upper left-hand corner of the screen.

Position of

SART

SART mark

length

Radar receiver

bandwidth

9500 MHz

9200 MHz

Sweep time

7.5 µs

95 µs

Low speed sweep signal

High speed sweep signal

Sweep start

General remarks on receiving SART

Figure 2-6 Appearance of SART signal on

the radar display

SART range errors

When responses from only the 12 low fre-

quency sweeps are visible (when the SART

is at a range greater than about 1 nm), the

position at which the first dot is displayed may

be as much as 0.64 nm beyond the true po-

sition 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.

Showing SART marks on the radar

display

A range scale between 6 and 12 nm with nor-

mal radar settings should display SART sig-

nals. However, this radar has a special feature

which enhances the SART signals.

1. Detune the radar. Press the [MENU] key

followed by the [0] key twice to display the

OTHER menu.

Radar bandwidth

This is normally matched to the radar

pulselength and is usually switched with the

range scale and the associated pulselength.

Narrow bandwidths of 3-5 MHz are used with

long pulses on long range and wide band-

widths of 10-25 MHz with short pulses on

short ranges.

OTHER

1. HDG SET

2. SPD MODE

3. MAN SPD

4. DRIFT SET

5. DISPLAY

6. MARK/LINE

7. TUNE

MAN LOG NAV

Any radar bandwidth of less than 5 MHz will

attenuate the SART signal slightly, so it is

preferable to use a medium bandwidth to

ensure optimum detection of the SART.

8. NAV DATA

9. EBL/VRM

0. ↓

Figure 2-7 OTHER menu

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Radar side lobes

2.4 RACON (Radar Beacon)

As the SART is approached, side lobes from

the radar scanner may show the SART re-

sponses as a series of arcs or concentric

rings. These can be removed by the use of

the anti-clutter sea control although it may

be operationally useful to observe the side

lobes as they may be easier to detect in clut-

ter conditions and also they will confirm that

the SART is near to the ship.

A racon is a radar transponder which emits

a characteristic signal when triggered by a

ship’s radar (usually only the 3 centimeter

band). The signal may be emitted on the

same frequency as that of the triggering ra-

dar, in which case it is superimposed on the

ship's radar display automatically.

The racon signal appears on the PPI as a

radial line originating at a point just beyond

the position of the radar beacon or as a

Morse code signal (figure below) displayed

radially from just beyond the beacon.

Gain

For maximum range SART detection the nor-

mal gain setting for long range detection

should be used, that is, with background

noise speckle visible.

Racon

A/C SEA control

For optimum range SART detection, this con-

trol should be set to the minimum. Care

should be exercised as wanted target in sea

clutter may be obscured. Note also that in

clutter conditions the first few dots of the

SART response may not be detectable, irre-

spective of the setting of the anti-clutter sea

control. In this case, the position of the SART

may be estimated by measuring 9.5 nm miles

from the furthest dot back towards own ship.

Figure 2-9 Appearance of RACON signal

on the radar display

Some sets have automatic/manual anti-clut-

ter sea control facilities in which case the op-

erator should switch to manual.

A/C RAIN control

This should be used normally (to break up

areas of rain) when trying to detect a SART

response which, being a series of dots, is not

affected by the action of the anti-clutter rain

circuitry. Note that Racon responses, which

are often in the form of a long flash, will be

affected by the use of this control.

Some sets have automatic/manual anti-clut-

ter rain control facilities in which case the op-

erator should switch to manual.

Note: This SART information is excerpted

from IMO SN/Circ 197 Operation of Marine

Radar for SART Detection.

2-5

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MAINTENANCE, TROUBLESHOOTING

WARNING

ELECTRICAL SHOCK HAZARD

Do not open the equipment.

Only qualified personnel

should work inside the

equipment.

Turn off the radar power

switch before servicing the

scanner unit. Post a warn-

ing sign near the switch

indicating it should not be

turned on while the scanner

unit is being serviced.

Prevent the potential risk of

being struck by the rotating

scanner and exposure to

RF radiation hazard.

Wear a safety belt and hard

hat when working on the

scanner unit.

Serious injury or death can

result if someone falls from

the radar scanner mast.

3.1 Periodic Maintenance Schedule

Periodic checks and maintenance are important for proper operation of any electronic sys-

tems. This chapter contains maintenance instructions to be followed to obtain optimum per-

formance and the longest possible life of the equipment.

Table 3-1 Maintenance schedule

Interval

Check point Check and measures

Display unit Periodically clean the exterior of

Remarks

Weekly

A CRT screen produces static charge

which attracts dust. DO NOT use

strong solvents like paint thinner or

abrasive cleaners for cleaning.

display unit with a dry soft cloth.

Use of commercially available

CRT cleaner (spray) having

antistatic effect is recommended. Dust and dirt on CRT creates

symptoms similar to poor sensitivity.

(Continued on next page)

3-1

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Table 3-1 Maintenance schedule (con’t)

Interval

Check point Check and measures

Exposed nuts Check for corroded or loosened

Remarks

3 to 6

Sealing compound may be used

months

(for quali- scanner unit

fied tech-

and bolts on

nuts and bolts. If necessary, clean instead of paint. Apply a small

and repaint them thickly. Replace amount of grease between nuts and

them if heavily corroded.

bolts for easy removal in future.

nicians

Scanner

only)

Check for dirt and cracks on

radiator surface. Thick dirt should for cleaning. If you need to remove

Do not use plastic solvent (acetone)

radiator

be wiped off with soft cloth

ice from scanner unit, use a wooden

hammer or plastic head hammer.

Crack on the unit may cause water

ingress, causing serious damages to

dampened with fresh water. if a

crack is found, apply a slight

amount of sealing compound or

adhesive as a temporary remedy, internal circuits.

then call for repair.

Terminal

strips and

plugs in

Open scanner cover to check

terminal strip and plug

connections inside. Also check

the rubber gasket of antenna

covers for deterioration.

When closing scanner covers in

position, be careful not to catch loose

wires between covers and unit.

scanner unit

6 months CRT and

High voltage at CRT and

If CRT anode rubber cap or wire

sheath is cracked, replace it.

For service technician: Wait at

least 3 minutes until high voltage

to one

year

surrounding

components

surrounding components attract

dust in environment which will

cause poor insulation. Ask a

FURUNO representative or dealer components (CRT and HV

to clean internal high-voltage

components.

(for quali-

fied tech-

nicians

only)

capacitors) discharge their residual

charges before accessing them.

Terminal

strips,

Check for loose connections.

Check contacts and plugs for

sockets, earth proper seating, etc.

terminal

3.2 Life Expectancy of Major Parts

Table 3-2 Life expectancy of major parts

Part

Type

Code No.

Life expectancy Radar Type

Magnetron

MG5240F (60 kW) 000-100-240

3,000 hours

FR-1760DS

FR-1710

MG5241

MG5436

000-100-036

000-140-762

FR-1725

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3.3 Fuse Replacement

3.5 Simple Troubleshooting

This paragraph describes how to cure opera-

tional problems, which can be made by ob-

serving the radar picture and using operator

controls and keys without opening the display

unit, antenna unit or other equipment units.

Various fuses are used to protect the equip-

ment from overvoltage (overcurrent) or equip-

ment fault. If the fuse blows find the cause

before replacing. If the fuse blows again after

replacement, request service.

The table below shows user-level

troubleshooting procedures.

CAUTION

Use the proper fuse.

Table 3-5 Easy troubleshooting

Use of a wrong fuse can cause fire or

equipment damage.

Problem

Remedy

No own

Check that SHIP'S MARK ON is

ship marker selected at the MARK/LINE menu

(keying sequence: [MENU], [0], [0]

[6], [6]). Also, own ship

Table 3-3 Fuses

information (length, width, etc.)

should have been entered in initial

settings. Consult a FURUNO

representative or dealer for

details.

Display unit

20A

FR-1760DS

Power Supply

Unit

5A, 2A

FR-1710

FR-1725

Display unit

20A DC unit

10A 100VAC

No picture

Turn the BRILL control clockwise.

220VAC

Color

appears

abnormal

Push the EBL rotary control to

degauss the screen.

No nav data Turn on navigation device.

3.4 Replacement of Batteries

The GYRO CONVERTER Board (option) has

a battery. The battery for the RP Board pre-

serves data when the power is turned off, and

its life is about five years. When the battery

voltage is low, NG (No Good) appears at the

diagnostic test for the RP board. When this

happens, contact your dealer to request re-

placement of the battery.

Table 3-4 Battery replacement information

Board

Name

Battery

Type

Code

Number

RP Board

GC Board

ER3S

000-127-759

000-103-769

CR 1/2 8.L

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3.6 Advanced-level Troubleshooting

This paragraph describes how to cure hardware and software troubles which should be car-

ried out by qualified service personnel.

Note: This radar equipment contains complex modules in which fault diagnosis and repair

down to component level are not practicable by users.

Serviceman qualification

All adjustments of radio transmitter during or coinciding with the installation, servicing, or

maintenance which may affect the proper operation must be performed by or under the imme-

diate supervision and responsibility of a person holding an operator certificate containing a

ship radar endorsement.

This is what the U.S. Codes of Federal Regulations part 80.169 implies (not exact extract).

As such, every administration sets forth its own rule; service personnel must be aware of this

kind of competency requirements.

Service call

When making a service call to your service agent, check S/N and symptom beforehand.

3-4

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Table 3-6 Advanced-level troubleshooting

Problem

Check point and

probable cause

Remedy

Adjust GAIN control with A/C 1. IF amplifier

SEA control set at minimum. 2. Signal cable between

1. Replace IF amplifier.

2. Check continuity and isolation of

coaxial cable. (Note: Disconnect

the plug and lugs at both ends of

coaxial cable before checking it

by ohmmeter.)

Marks and legends appear

but no noise or echo.

antenna and display

3. Video Amplifier Board

3. Check video coax line for secure

connection. If connection is good,

replace SPU Board.

Marks, legends and noise

appear but no echo.

(Transmission leak,

representing own ship

position, is absent.)

1. Magnetron

2. Modulator Board

3. SPU Board

1. Check magnetron current.

2. Replace Modulator Board.

3. Replace SPU Board.

Picture not updated

1. Bearing Signal Generator

Board (scanner unit)

2. SPU Board

1. Check the connection of signal

cable.

2. Replace SPU Board.

3. Turn off and on radar.

3. Video lockup

Incorrect orientation of

picture

1. SPU Board

1. The message "HD SIG

MISSING" appears when the

heading pulse is not received

during stand-by.

2. Gyro Interface

2. Replace gyro interface.

Tuning manually adjusted

but poor sensitivity

1. Deteriorated magnetron

1. With radar transmitting on 48 nm

range, check magnetron

current. If current is below normal

value, magnetron may be

defective. Replace magnetron.

2. Check MIC detecting current. If it

is below normal value, MIC may

have become detuned. MIC must

be tuned.

3. Clean radiator surface.

4. Disable the second-trace rejector

referring to paragraph 1.33.

2. Detuned MIC

3. Dirt on radiator face

4. Second trace rejection is

ON.

Range changed but radar

picture does not change

1. Defective RANGE key

1. Try to hit [+] and [-] RANGE

keys several times. If unsuccess-

ful, replacement of keypad may

be required.

2. SPU Board

3. Mother Board

4. Video lockup

2. Replace SPU Board.

3. Replace Mother Board.

4. Turn off and on radar.

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Table 3-7 Advanced-level troubleshooting (con’t)

Problem

Check point and

probable cause

Remedy

Interference rejector

inoperable (interference

rejection level not displayed)

1. SPU Board

2. Mother Board

1. Replace SPU Board.

2. Replace Mother Board.

Echo stretch ineffective

(Neither "ES1" nor "ES2" is

displayed.)

1. SPU Board

1. Replace SPU Board.

Only 2 parallel index lines

(6 lines wanted)

1. Incorrect setting of index

line interval

1. Set index line interval referring to

paragraph 1.27.

Range rings are not

displayed.

1. Adjust the brilliance of

range rings with the

intensity is increased.

2. SPU Board

1. Replace associated circuit board if

unsuccessful.

2. Replace SPU Board.

Poor discrimination at range 1. Sea clutter control not

functioning properly.

1. Improper setting of A/C SEA

control. If A/C SEA is seen only

at very close range, suspect

inaccurate frequency of

crystal oscillator.

True motion presentation not 1. Poor contact of MODE

1. Try to press MODE key a little

harder.

working correctly.

key.

2. Selection is not accessed.

2. Press MODE key until "TM"

appears.

3. Speed entry is incorrect.

4. TM display inaccurate

3. Enter correct own ship speed

referring to paragraph 1.12.

4. Make sure that speed and compass

inputs are accurate.

Target not tracked correctly 1. Poor definition of targets in

sea clutter

1. Adjust A/C SEA and A/C RAIN

controls referring to paragraphs

1.14 and 1.15.

3-6

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[MENU] key

3.7 Diagnostic Test

A diagnostic test program is provided to en-

able testing of major circuit boards in the ra-

dar display unit. Note that the normal radar

picture is lost during this test.

1. VIDEO PLOT

2. TGT TRAIL

3. TGT ALARM

4. PANEL DIM

5. ECHO SIG

6. FUNC

Proceed as follows to execute the diagnostic

test:

7. PLOT

8. MARK

9. BRILL

1. Press the MENU key to shown the main

menu.

0. OTHER

2. Press the [0] key four times to select the

OTHER sub menu.

[0] key TWICE

OTHER

3. Press the [2] key to select TEST.

Program numbers appear. The diagnos-

tic test is executed and the screen shows

test results as shown on the next page.

OKs appear for normal operation.ARP re-

sults appear only when optional ARP

Board is mounted. If NG (No Good) ap-

pears, corresponding components may be

defective. Consult your dealer.

1. HDG SET

2. SPD MODE

3. MAN SPD

4. DRIFT SET

5. DISPLAY

6. MARK/LINE

7. TUNE

8. NAV DATA

9. EBL/VRM

0. ↓

MAN LOG NAV

5. Small squares and circles displayed on the

test results screen are for testing the keys

and controls. As you operate the keys,

corresponding squares are highlighted, in-

dicating that your control/key operations

are properly recognized.

[0] key TWICE

OTHER

1. ↑

2. TEST

3. DEGAUSS

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

the display circuit. See page 3-9.

4. TIME ALARM

5. RANGE

6. INSTALL

7. To terminate the diagnostic test, press the

[MENU] key.

[2] key TWICE to

start test

Figure 3-1 Sequence for diagnostic test

3-7

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FR-1700 Series TEST

1. Program No.

2. ROM Check

03591511**

3. RAM Check

4. Antenna Rotation

24rpm

5. Tx Trigger Frequency 3000Hz

6. Video Level

7. Video Signal

8. Navigation I/O 1

9. Navigation I/O 2

000

ROM Test

RAM Test

10. NMEA Heading IN OK

11. LOG Pulse IN

ARP Test

1. Program No.

2. ROM Check

3. RAM Check

4. Speed Log

5. Course

18590411** 18590421**

OK 0.0 KT

** Program No.

6. Trigger

0003

0274

0000

7. Video Signal

8. Bearing Pulse

9. Heading Pulse

10. Minimum Hit

11. Scan Time

12. Manual Acq.

13. Auto Acq.

14. FE-Data 1

15. FE-Data 2

Press MENU key to

return to radar picture.

Press MENU key to escape.

Press ENTER key to check CRT.

Control Check

Bar length

increases with

clockwise rotation;

decreases with

counterclockwise

rotation.

Press ENTER/SELECT

key to go picture check

facility.

000

X:000

Y:000

Trackball Confirmation

Figure increments upward

with up, right rotation;

downward with down, left

rotation.

Test

pattern

EBL Control Confirmation

(Figure increments upward

with clockwise rotation;

downward with counterclockwise

rotation.)

VRM Control Confirmation

(Figure increments upward

with clockwise rotation;

downward with counterclockwise

rotation.)

Figure 3-2 Test results screen

3-8

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Select item with tenkey and adjust by VRM knob.

CRT ADJUSTMENT

1. ↑

2. H SIZE

3. H POSITION

4. V SIZE

5. V POSITION

6. PINCUSHION

7. BRIGHTNESS

Figure 3-3 Display circuit test

3-9

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PARTS LOCATION

Cooling Fan

0615-24M

ATA Board ARP-17

(option) 18P9004A

DANGER

Electrical shock

hazard.

Do not touch anode

cap or its cable.

Figure 4-1 Display unit, right side view

Cooling Fan

MMS-06C24DS-R01

RP Board RP-17 (option)

03P9259A

DANGER

Electrical shock

hazard.

Do not touch parts in-

side this cover.

FR-1710: HV Board 03P9017A

FR-1725: HV Board 03P9017B

FR-1710/1725: DC-PTU Board 03P9223A

AC-PTU Board 03P9228A/B

FR-1760DS: DC-PTU Board 03P9223B

Figure 4-2 Display unit,

left side view

4-1

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CRT

SPU Board

03P9230

Figure 4-3 Display unit, top view

GYRO

CONVERTER

Board (option)

64P1106A

Figure 4-4 Display unit, top view

4-2

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FR-1760DS Scanner Unit

STB-2

STB-3

MIC

(ATT Board

ATT-7362

behind MIC)

IF AMP 03P6570

(MBS Board

03P6569 behind

IF AMP)

J910, P910

STB-1

J601, P601

Figure 4-5 Scanner unit, left side view

J829

R811

R812

RF section

MD Board

03P6668

Magnetron

MG5240F

RTB Board

[C] 03P6666

RELAY Board

[A] 03P9004

Pulse transformer

T801

CR808

CR809

Figure 4-6 Scanner unit, right side view

4-3

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FR-1760DS Scanner Unit (con’t)

PULSE GENERATOR

Board [A] MP-3795

Fan motor

B802

Scanner motor

B801

Magnetron

MG5240F

Figure 4-7 Scanner unit, right side view, RF section removed

MAG HTR DET Board

[A] 03P6827

J821

Pulse transformer

T801

Choke coil

L801

CR815

CR814

Relay

K801

K802

K803

CR813

PFN Board

[C]03P6669

MD Board

03P6668

Figure 4-8 RF section, rear view

4-4

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FR-1760DS Power Supply Unit

TX HV Board (2)

03P6810

Transmitter

section

TX HV Board (1)

03P6810

POWER Board

03P6810

Transformer

T804

Fan motor B801

Check meter

Switch S801

RELAY Board

[A] 03P9003

R813

Hour meter

Fuse 801

Terminal board

PTB-2

Terminal board

PTB-1

Fuse 802

Fuse 803

Figure 4-9 FR-1760DS Power supply unit

4-5

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FR-1710/1725 Scanner Unit

S901

MP-3795

Board

TB Board

03P9242

RF Module

Motor

Bow Side

MIC Assy.

IF Board

03P9232

RU-9253 (For RTR-063)

RU-9371 (For RTR-062A)

Diode Limitter

RU-9099

RFC Board

03P9243

* * K W

T R - 0 6 *

RF module (Upper part)

4-6

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MD Board

03P9244

Fan motor assy.

03-1900

J811

J812

Pulse Transformer

RT-9025 (For RTR-062A)

RT-9023 (For RTR-063)

Magnetron

E3566 (For RTR-062A)

MG5436 (For RTR-063)

Module (Lower part)

4-7

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SPECIFICATIONS OF MARINE RADAR

FR-1710/1725/1760DS

1. ANTENNA RADIATORS

(1) Type

Slotted waveguide array

(2) Polarization

(3) Rotation

Horizontal

24 rpm or 42 rpm (FR-1760DS: 24 rpm only)

4 ft (XN12AF), 6.5 ft (XN20AF), 8 ft (XN24AF)

8.1 ft (SN4A), 9 ft (SN5A)

(4) Radiator length

(5) Horizontal Beamwidth

-3 dB:

1.8° (XN12AF), 1.23° (XN20AF), 0.95° (XN24AF)

2.68° (SN4A), 1.23° (SN5A)

-20 dB:

3.1° (XN12AF), 3.1° (XN20AF), 2.5° (XN24AF)

20°

(6) Vertical Beamwidth

(7) Sidelobe attenuation

XN12AF:

-24 dB (within ±10° of main-lobe)

-30 dB (outside ±10° of main-lobe)

-24 dB (within ±20° of main-lobe)

-30 dB (outside ±20° of main-lobe)

-23 dB (within ±20° of main-lobe)

-25 dB (outside ±20° of main-lobe)

-20 dB (within ±20° of main-lobe)

-25 dB (outside ±20° of main-lobe)

XN12AF: 27.5 dB, XN20AF: 30.0 dB, XN24AF: 31.5 dB

SN4A: 26.0 dB, SN5A: 26.4 dB

51.5 m/s relative

XN20AF/XN24AF:

SN4A:

SN5A:

(8) Antenna Gain

(9) Wind Speed

2. RF TRANSCEIVER

(1) Frequency

FR-1710/1725: 9410 MHz ±30 MHz

FR-1760DS: 3050 MHz ±30 MHz

FR-1710: 10 kW, FR-1725: 25 kW, FR-1760DS: 60 kW

-40 dB or less

(2) Output Power

(3) Spurious Response

(4) IF Amplifier

(5) Bandwidth

60 MHz, Logarithmic

FR-1710/1725:

Short 1/2, Middle 1 pulse: 27 MHz

Middle 2/3, Long pulse: 3 MHz

Short pulse: 27 MHz

FR-1760DS:

Middle 1/2, Long pulse: 3 MHz

SP - 1

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(6) Range, Pulselength (PL) & Pulse Repetition Rate (PRR)

FR-1710/1725:

Range (nm)

PRR (Hz)

0.125 0.25 0.5 0.75 1.5

12 24 48 72 96

S1P 3000

S2P 3000

M1P 1500

M2P 1000

M3P 1000

0.07 ms

0.15 ms

0.3 ms

0.5 ms

0.7 ms

600

1.2 ms

*: Second echo trace mode PRR; 500 Hz

Maximum Range: FR-1710: 72 nm, FR-1725: 96 nm

FR-1760DS:

Range (nm)

PRR (Hz)

1900

0.125 0.25 0.5 0.75 1.5

12 24 48 72 96 120

0.08 ms

M1P 1100

M2P 600

0.3 ms

0.6 ms

*: 450 Hz on 120 nm range

(7) Duplexer

600^*

1.2 ms

Ferrite circulator with diode limiter

(8) Noise figure

FR-1710/1725: 6 dB, FR-1760DS: 4dB

3. RADAR DISPLAY

(1) Picture tube

17" color CRT, Effective display diameter: 225 mm

Yellow or green echoes in 16 levels

(2) Scanning

Raster scan at scanning frequency 48.3 kHz horizontal, 60 Hz vertical.

Number of scanning lines 768, non-interlaced.

(3) Range scales and ring intervals

Range(nm) 0.125 0.25 0.5 0.75 1.5

Ring interval(nm) 0.025 0.05 0.1 0.25 0.25 0.5

No. of Rings

12 24 48 72 96 120

12 16 20

Maximum Range: FR-1710: 72 nm, FR-1725: 96 nm, FR-1760DS: 120 nm

(4) Range discrimination

(5) Bearing discrimination

34 m on 1.5 nm range

XN12AF: 2.03°, XN20AF: 1.46°, XN24AF: 1.18°

SN4A: 2.83°, SN5A: 2.53°

(6) Minimum range

28 m

SP - 2

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(7) Bearing accuracy

(8) Range accuracy

(9) Presentation modes

±1°

1% of range in use or 8 m whichever is the greater

Head-up, Head-up TB, North-up, Course-up, True motion north-up

(Gyro signal required except for HU)

(10) Variable Range Markers Two Variable Range Markers, switchable

(11) Electronic Bearing Lines Two Electronic Bearing Lines, switchable

(12) Offcenter

Sweep origin can be offcentered by 75% of range in use in any direction

(Not available for maximum range)

4. POWER SUPPLY

(1) DC Source

FR-1710/1725:

FR-1760DS:

24 rpm: 24/32 VDC: 8.5/6.4 A, 42 rpm: 24/32 VDC: 8.8/6.6 A

24 VDC: 5.6 A

(2) AC Source

FR-1710:

100-115/200-230 VAC, 1 phase, 50-60 Hz

2.3 A (24 rpm), 3.2 A (42 rpm)

FR-1725:

100-115/200-230 VAC, 1 phase, 50-60 Hz

3.2 A (24 rpm), 3.3 A (42 rpm)

FR-1760DS:

Display unit:

24 VDC: 5.6 A

Antenna power supply unit:100-115 VAC: 3.0 A, 1 phase, 50-60 Hz

220/240 VAC, 1 phase, 50-60 Hz (optional rectifier required)

5. DIMENSION AND MASS

See Outline Drawing

6. ENVIRONMENTAL CONDITIONS

(1) Ambient temperature (Complies with IEC 945)

Display unit: -15 to + 55°C

Antenna unit : -25 to + 70°C

(2) Relative humidity

(3) Water proofing

(4) Vibration

95% at 40°C

Display unit (panel): IEC60529 IPX2, Antenna unit: IEC60529 IPX6

±1 mm ±10%, 2(5) to 13.2 Hz,

Maximum acceleration 7 m/s², 13.2 to 100 Hz

(5) Category of Equipment Units

Display unit:

To be installed in a protected area

Antenna power supply unit To be installed in a protected area

Antenna unit:

To be installed in an exposed area

SP - 3

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Performance Monitor:

To be installed in an exposed area

7. COATING COLOR

(1) Display Unit

Panel: N3.0, Chassis: 2.5GY5/1.5

N9.5

(2) Antenna Unit

8. COMPASS SAFE DISTANCE

(1) Display unit

(2) Antenna unit

FR-1710:

Standard: 1.15 m

Steering: 0.90 m

Standard: 1.65 m

Standard: 2.15 m

Standard: 4.40 m

Steering: 1.25 m

Steering: 1.60 m

Steering: 3.30 m

Steering: 0.90 m

FR-1725:

FR-1760DS:

(3) Antenna power supply unit Standard: 1.20 m

SP - 4

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INDEX

A/C AUTO control 1-12

A/C RAIN control 1-13

A/C SEA control 1-12

ACQ key 1-20

GAIN control 1-12

GZ ALARM key 1-17

A/D converter curve setting 1-35

Alarms 1-36

AUDIO OFF key 1-22

Heading line 1-27

Heading marker 1-27

HM OFF control (GAIN control) 1-27

Background color 1-34

Battery replacement 3-3

Bearing measurement 1-14

Bearing scale format 1-34

BRILL control 1-3

Brilliance

INDEX LINE key 1-26

Interference rejector 1-13

Maintenance schedule 3-1

Major parts life expectancy 3-2

MARK key 1-26

screen 1-3

screen data 1-30

Menu tree viii

MODE key 1-6

Multiple echoes 2-2

Clutter sweep 1-33

Compass readout adjustment 1-4

Navigation data 1-32

Noise rejector 1-31

North marker 1-27

DEGAUSS control 1-4

Degaussing interval 1-32

Diagnostic test 3-7

Offcentering 1-17

Origin marks 1-26

EBL OFF key 1-14

EBL OFFSET key 1-15

EBL ON key 1-14

Echo averaging 1-19

ECHO control 1-10

Panel backlighting 1-3

Parallel index lines 1-26

POWER switch 1-1

Echo stretch 1-10

Performance monitor 1-37

Presentation modes 1-6

Pulselength 1-10

Electronic Plotting Aid (EPA) 1-20–1-23

CPA/TCPA ranges 1-22

past plot points 1-23

plotting a target 1-20

silencing audio alarm 1-22

target data 1-21

RACON 2-5

terminating plotting 1-21

true, relative vector 1-21

vector time 1-21

Enhanced video 1-31

Enlarging close-in targets 1-35

RANGE key 1-8

Range measurement 1-14

Range scale 1-8

Range scale preset 1-34

RINGS key 1-14

False echoes 2-2–2-3

Function keys 1-28

Fuse replacement 3-3

SART (Search and Rescue Transponder) 2-3

Second-trace echoes 1-30

Shadow sector 2-3

SHIFT key 1-17

Index-1

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Sidelobe echoes 2-2

Speed input 1-9

STBY/TX key 1-1

Stern marker 1-27

System configuration vi

Target alarm

acknowledging alarm 1-17

deactivating 1-17

inward, outward alarms 1-17

setting 1-16

Target position output 1-33

Target trails

afterglow 1-25

displaying, erasing target trails 1-24

restoring trails 1-24

target gradation 1-24

thin trails 1-25

trail brilliance 1-25

trail time 1-24

true, relative trails 1-23

Time alarm 1-31

Troubleshooting

advanced 3-4

simple 3-3

Tuning 1-3

User keys (F1, F2, F3) 1-28

Video contrast 1-33

Virtual image 2-3

VRM OFF key 1-14

VRM ON key 1-14

Zoom 1-27

ZOOM key 1-27

Index-2

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