Furuno FAR-2805, FR-2805 User Manual

MARINE RADAR

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FAR/FR-2805 Series

Radar ARPA Bacic Spec.

( ) FR-2815
( ) FR-2825
( ) FR-2855
( ) FR-2825W
( ) FR-2855W
( ) FR-2835S
( ) FR-2835SW
( ) FR-2865SW

( ) FAR-2815
( ) FAR-2825
( ) FAR-2855
( ) FAR-2825W
( ) FAR-2855W
( ) FAR-2835S
( ) FAR-2835SW
( ) FAR-2865SW
( ) FA-2805

X-band, 12 kW, TR up
X-band, 25 kW, TR up
X-band, 50 kW, TR up
X-band, 25 kW, TR down
X-band, 50 kW, TR down
S-band, 30 kW, TR up
S-band, 30 kW, TR down
S-band, 60 kW, TR down
Add-on ARPA

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All rights reserved.

PUB. No. OME- 34040

( YOSH)

FIRST EDITION : AUG. 1995

9-52, Ashihara- cho,
Nishinomiya, Japan

Telephone: [phone]
Telefax: 0798-65-4200

Printed in Japan

Your Local Agent/Dealer

X2 : FEB. 22, 2002

FAR/FR-2805 SERIES

DANGER

SAFETY INSTRUCTIONS

WARNING

DANGER

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

Serious injury or even death may result if a rotating antenna strikes
someone standing nearby.

WARNING

Radio Frequency Radiation Hazard

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

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WARNING

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 warn­ing 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.

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.

Do not operate the equipment with wet
hands.

Electrical shock can result.

Keep heater away from equipment.

Heat can alter equipment shape and melt
the power cord, which can cause fire or
electrical shock.

CAUTION

Serious injury or death can
result if someone falls from
the radar scanner mast.

Do not disassemble or modify the
equipment.

Fire, electrical shock or serious injury can
result.

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

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

Do not use the equipment for other than
its intended purpose.

Use of the equipment as a stepping stool,
for example, can result in personal injury
or equipment damage.

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

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

ii

TABLE OF CONTENTS

INTRODUCTION

A Word to the Owner of FURUNO Radar................................................................................ v

About This Manual ..................................................................................................................vi

Features...................................................................................................................................vii

Specifications...........................................................................................................................ix

SYSTEM CONFIGURATION ...............................................................................................xii

1. OPERATION

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

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

1.3 Controls ........................................................................................................................1-2

1.4 CRT Brilliance..............................................................................................................1-6

1.5 Tuning the Receiver......................................................................................................1-6

1.6 On-screen Legends and Markers ..................................................................................1-7

1.7 Degaussing the CRT Screen .........................................................................................1-8

1.8 Initializing the Gyro Readout .......................................................................................1-9

1.9 Presentation Modes.......................................................................................................1-9

1.10 Selecting the Range Scale...........................................................................................1-12

1.11 Selecting the Pulsewidth.............................................................................................1-12

1.12 Adjusting the Sensitivity ............................................................................................1-14

1.13 Suppressing Sea Clutter..............................................................................................1-14

1.14 Suppressing Precipitation Clutter ...............................................................................1-15

1.15 Interference Rejector ..................................................................................................1-15

1.16 Measuring the Range ..................................................................................................1-16

1.17 Measuring the Bearing................................................................................................1-16

1.18 Collision Assessment by Offset EBL .........................................................................1-17

1.19 Measuring Range and Bearing Between Two Targets................................................1-18

1.20 Setting a Guard Zone (Guard Alarm) .........................................................................1-18

1.21 Off-Centering..............................................................................................................1-19

1.22 Echo Stretch................................................................................................................1-20

1.23 Echo Averaging...........................................................................................................1-21

1.24 Electronic Plotting Aid (EPA) ....................................................................................1-22

1.25 Target Trails (Echo Trails) ..........................................................................................1-24

1.26 Parallel Index Lines....................................................................................................1-26

1.27 Anchor Watch .............................................................................................................1-28

1.28 Origin Mark ................................................................................................................1-29

1.29 Zoom...........................................................................................................................1-30

1.30 Markers.......................................................................................................................1-30

1.31 Menu Keys..................................................................................................................1-31

1.32 RADAR 1 and 2 Menu Settings .................................................................................1-32

1.33 Function Keys.............................................................................................................1-33

1.34 EPA Menu...................................................................................................................1-39

1.35 NAV INFORMATION Menu and Navigation Data Display......................................1-40

1.36 Radar Map ..................................................................................................................1-42

1.37 Suppressing Second-trace Echoes ..............................................................................1-43

1.38 Adjusting Relative Brilliance Levels of Screen Data .................................................1-44

iii

1.39 Set and Drift (Set and Rate)........................................................................................1-44

1.40 Display of Ancillary Information ...............................................................................1-45

1.41 Alarms ........................................................................................................................1-46

2. OPERATION OF ARPA

2.1 General .........................................................................................................................2-1

2.2 Keys Used for ARPA ....................................................................................................2-1

2.3 ARPA Menu Operation .................................................................................................2-2

2.4 Start-up Procedure ........................................................................................................2-3

2.5 Automatic Acquisition..................................................................................................2-4

2.6 Manual Acquisition.......................................................................................................2-7

2.7 Changing Plot Symbol Size..........................................................................................2-7

2.8 Adjusting Brilliance of Plot Marks.............................................................................2-10

2.9 Displaying Target Data ...............................................................................................2-10

2.10 Mode and Length of Vectors.......................................................................................2-11

2.11 Past Position Display ..................................................................................................2-11

2.12 Setting CPA/TCPA Alarm Ranges ..............................................................................2-12

2.13 Setting a Guard Zone..................................................................................................2-13

2.14 Operational Warnings .................................................................................................2-14

2.15 Trial Maneuver ...........................................................................................................2-15

2.16 ARPA T rack Test ........................................................................................................2-17

2.17 Criteria for Selecting Targets for Tracking.................................................................2-18

2.18 Factors Affecting ARP A Functions.............................................................................2-19

3. RADAR OBSERVATION

3.1 General .........................................................................................................................3-1

3.2 False Echoes .................................................................................................................3-2

3.3 SART (Search and Rescue Transponder) .....................................................................3-3

3.4 RACON (Radar Beacon) ..............................................................................................3-5

4. MAINTENANCE

4.1 Periodic Maintenance Schedule....................................................................................4-1

4.2 Life Expectancy of Major Parts ....................................................................................4-2

5. TROUBLESHOOTING

5.1 Easy Troubleshooting ...................................................................................................5-1

5.2 Advanced-level Troubleshooting..................................................................................5-2

5.3 Diagnostic Test .............................................................................................................5-5

APPENDIX

A.1 Performance Monitor...................................................................................................A-1

A.2 For Fishing Vessel .......................................................................................................A-2

A.3 Navigation Data (IEC 61162-1 Edition 1 and Edition 2) ............................................A-3

A.4 Sentence Description ...................................................................................................A-7

MENU TREE ............................................................................... MN-1

Declaration of conformity to type
Declaration of Conformity

iv

(FR/FAR-2855, FR/FAR-2855W, FR/FAR-2865SW)

INTRODUCTION

A W ord to the Owner of FURUNO Radar

Thank you for purchasing this FURUNO radar and/or ARPA. 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 50 years,
FURUNO Electric Company has gained an unrivaled reputation as a world leader in the in­dustry. 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 and operating and maintenance in­structions set forth in this manual before attempting 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 procedures.

FR-2805 Series

The FR-2805 Series are available in the following two types:

Regular type and IMO type

The Regular type is for fishing boats and pleasure boats where some more functions are
provided in addition to the functions of IMO type.

Note: You can easily recognize which type your radar/ARPA is by looking at the range scale
provided.

The FURUNO FR-2805 Series of radars are designed to meet the exacting requirements of
international and national standards and regulations including:

–IMO MSC-64 (67) Annex 4: Performance Standards for Radar Equipment
–IMO A.477 (XII): Performance Standards for Radar Equipment
–A. 694 (17): General requirements for shipborne radio equipment forming part of the
global
maritime distress and safety system (GMDSS) and for electronic navigation aids
–IEC 60936-1: Shipborne Radar Operational and Performance Requirements
–IEC 60936-2: Radar for HSC
–IEC 60945: Marine Navigational Equipment General Requirements

FAR-2805 Series ARPA

There are also Regular type and IMO type as in the FR-2805-I series radars. The IMO type
ARPA complies with the following (Regular type also complies with but includes more addi­tional functions convenient for practical uses in fishing):

–IMO Resolution A.823 (19): Performance standards for Automatic Radar Plotting Aids
–A. 694 (17): General requirements for shipborne radio equipment forming part of the
global maritime distress and safety system (GMDSS) and for electronic navigation aids
–Results of NAV 40/WP.3/Add. l which is to be met for new building on or after January 1,
1997
–IEC 60945:1996-11: Marine Navigational Equipment General Requirements
–Us Navigation safety regulations, Labeling requirement in § 164.38(d)(1) of CFR33

v

"This device was designed and manufactured to comply with the International Mari­time Organization (IMO) Performance Standards for Automatic Radar Plotting Aids
(ARPA)."

WARNING

If your ship is 10,000 or more gross tons and scheduled to operate in the navigable waters of
the United States, make sure the above label is attached on the ARPA. Otherwise please
make one yourself by typing and gluing overleaf with the transparent seal.

Precautions on high speed craft

 Assume your ship is making 40 kt and a target ship is approaching at 40 kt right toward

you. Then the relative speed is 80 kt. With the antenna revolving at 42 rpm, the target blip
appears jumping to a new location 59 m nearer. This jump corresponds to 23 mm on the
360 mm display using the 0.25 nm range scale. On such a short range you may lose the
track of target in the midst of sea clutter, random noise or other targets. Use one step larger
range scale.

 ARPA can fail to track a target when the relative speed exceeds 100 kt.

About This Manual

This manual is designed to provide information on operation and maintenance of the FR-2805
series radars as well as fault diagnosis and troubleshooting procedures which may be per­formed by suitably qualified personnel on board.

In producing this manual, we tried to provide as "user friendly" an operation guide as possible
to the many functions of this sophisticated equipment. We would appreciated feedback from
you about this manual. Your comments and suggestions would be valuable inputs for future
improvement.

Categorization by specification

See the table on the next page.

vi

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Features

The new FR-2805 series of radar and the F AR-2805 series of ARPAs are the results of com­bination of the FURUNO's many years of experience in the marine field and the advanced
computer technology. The FR-2805 series and FAR-2805 series are designed to fully meet
the exacting rules of the International Maritime Organization (IMO) for installations on all classes
of vessels.

The display unit employs a 28" diagonal high-resolution green-phosphor CRT. It provides an
effective radar picture of 360 mm diameter leaving sufficient space for on-screen alphanu­meric data.

Target detection is enhanced by the sophisticated signal processing technique such as multi­level quantization (MLQ), echo stretch, echo average, and a built-in radar interference rejec­tor . Audible and visual guard zone alarms are provided as standard. Other ship's movement is
assessed by trails of target echoes or by electronic plotting. The FAR-2805 series ARPA fur­ther provides target assessment by historical plots, vectors and target data table.

On-screen data readouts include CP A, TCPA, range, bearing, speed/course of own ship and
up to 3 targets. The ARPA functions include automatic acquisition of up to 20 targets, or
manual acquisition of 40 targets. In addition, the ARP A features display of a traf fic lane, buoys,
dangerous points, and other important reference points.

vii

General features

 Daylight-bright high-resolution display
 28" diagonal CRT presents radar picture of 360 mm effective diameter with alphanumeric

data area around it

 User friendly operation by combination of tactile backlit touchpads, a trackball and rotary

controls

 Audio-visual alert for targets in guard zone
 Echo trail to assess targets' speed and course by simulated afterglow
 Electronic plotting of up to 10 targets in different symbols (This function is disabled when

ARPA is activated.)

 Electronic parallel index lines
 Interswitch (optional) built in radar or ARPA display unit
 Enhanced visual target detection by Echo Average, Echo Stretch, Interference Rejector,

and multi-level quantization

 Stylish display
 Choice of 10, 25 or 50 kW output for X-band; 30 kW output for S-band, either in the trans-

ceiver aloft (gearbox) or RF down (transceiver in bridge)

 Exclusive FURUNO MIC low noise receiver

ARPA features

 Acquires up to 20 targets automatically plus up to 20 targets manually, or all 40 targets

manually

 Movement of tracked targets shown by true or relative vectors. (Vector length 1 to 99 min.

selected in 1 min. steps.)

 Setting of nav lines, buoy marks and other symbols to enhance navigation safety
 On-screen digital readouts of range, bearing, course, speed, CPA (Closest Point of Ap-

proach), TCPA (Time to CPA), BCR (Bow Crossing Range) and BCT (Bow Crossing Time)
of 2 targets out of all tracked targets.

 Audible and visual alarms against threatening targets coming into operator-selected CPA/

TCPA limits, lost targets, targets, two guard rings, visual alarm against system failure and
target full situation

viii

Specifications

ANTENNA RADIATORS

1. Type

Slotted waveguide array

2. Beamwidth and sidelobe attenuation

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3. Polarization

Horizontal

4. Rotation

FR/FAR-2815/2825: 24/42 rpm
FR/FAR-2825W2855W,
FR/FAR-2835SW/2865SW: 21 rpm (50 Hz),
26 rpm (60 Hz)
FR/FAR-2835S: 21 rpm (50 Hz),
26 rpm (60 Hz),
45 rpm (for HSC)
FR/FAR-2855: 16 rpm (50 Hz),
20 rpm (60 Hz or DC)

RF TRANSCEIVER

1. Frequency

X-band: 9410 MHz ±30 MHz
9415 MHz ±30 MHz(50kW)
S-band: 3050 MHz ±30 MHz

2. Output power

FR/FAR-2815: 12 kW
FR/FAR-2825/2825W: 25 kW
FR/FAR-2855-I/2855W: 50 kW
FR/FAR-2835S-I/2835SW: 30 kW
FR/FAR-2865SW: 60 kW

3. Pulselength/PRF

FR/FAR-2815/2825

Range(nm) Pulselength (µs) PRR (Hz)

0.125, 0.25 0.07 2200

0.5, 0.75 0.07/0.15 2200

1.5 Two from 0.07, 0.15, 0.3 2200/1000
3 Two from 0.15, 0.3, 0.5 2200/1000
6 Two from 0.3, 0.5, 1.2 1000/600
12, 24 Two from 0.5, 1.2 1000/600
48, 96 1.2 600 (48

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FR/FAR-2825W, 2855, 2855W, 2835S,
2835SW, 2865SW:

Range (nm) Pulselength (µs) PRR (Hz)

0.125, 0.25, 0.5 0.08 2200

0.75, 1.5 0.08/0.3* 2200
3 Two from 0.08, 0.3*, 0.6 2200/1100
6 Two from 0.08, 0.3*, 0.6 2200/1100
12, 24 0.6, 1.2 1000/600
48, 96 1.2 600/500
*: In case of FR-2855, FR-2855W, FR-2865SW

0.3 is replaced with 0.2.0

4. I.F.

FA03NS

60 MHz, Logarithmic
S1-M1: 28 MHz
M2-Lpulse: 3 MHz

5. Duplexer

Ferrite circulator with diode limiter for
FR/FAR-2815/2825/2835S/2835sw
Ferrite circulator with TR limiter for FR­2825W/2855/2855W/2865SW

6. Noise figure

FR/FAR-2815/2825/2825W/2855/2855W/
2835S: 6 dB
FR/FAR-2835SW: 4 dB
FR/FAR-2865SW: 4.5 dB

RADAR DISPLAY

1. Picture tube

28" color CRT, Effective radar diameter 360
mm
IMO type: Yellow or green echoes in 16 levels
R-type: Yellow or green echoes in 16 levels or
3 colors depending on echo strengths
Different color for VRM, range rings, alarms,
etc.
Raster scan at 32.25 kHz horizontal, 60 Hz
vertical. Number of scanning lines 1024,
interlaced.

2. Minimum range and discription

35 m

3. Range scales (nm)

IMO type:

0.125 (.025), 0.25 (0.05), 0.5 (0.1), 0.75
(0.25), 1.5 (0.25), 3 (0.5), 6 (1), 12 (2), 24 (4),
48 (8), 96 (16)
R-type:

0.125 (.025), 0.25 (0.05), 0.5 (0.1), 0.75
(0.25), 1.5 (0.25), 3 (0.5), 6 (1), 12 (2), 16 (4),
24 (4), 32 (8), 48 (8), 72 (16), 120 (20)

4. Range accuracy

1% of range in use or 15 m whichever is the
greater

ix

5. Bearing accuracy

±1°

6. Bearing discrimination

Better than 2.5° except S-band 10 ft radiators
(SN-30AF)

7. Presentation modes

Head-up, Head-up TB, North-up, Course-up,
True motion north-up
(Automatically set to HU in case of compass
failure)

8. Variable Range Markers

Two Variable Range Markers, switched

9. Electronic Bearing Lines

Two Electronic Bearing Lines, switched
Range merker on EBL

10. Offcenter

IMO type: Sweep origin can be offcentered
by 75% of range in use in any direction.
Regular type: Any direction up to 100%

5. Collision warning

CPA limit: 0.2 to 10 nm
TCPA limit: 0 to 99 min

6. Guard zone (Guard ring)

2 guard zones (guard rings) of operator­defined width in 0.7 to 32 nm, Sector 1 to
360° any direction

7. Trial maneuver

Simulates the effect on all tracked targets of
own ship maneuver with course, speed and
delay time.

INTERFACING

1. IEC 61162-1

OSD, RSD, TTM, etc. (Listener 2 mA at 2V,
Talker 60 mA max)

2. Analog

RGB video, H/V sync for VDR with optional
board)

11. Target alarm zone

2 TAZ at 3 and 6 nm in width of 0.5 nm, any
sector.

12. Electronic plotting (E-plot)

10 targets manual plotting. Not operative in
ARPA mode.

13. Parallel index lines

2, 3 and 6 lines (selectable on menu)

14. Navigation lines (option)

Two lines to define a navigation channel
(with RP-25)

ARPA FUNCTIONS

1. Acquisition

Instant selection of auto or manual acquisition
in 0.2 to 32 nm, relative speed 100 kt. Auto
20 targets plus manual 20 targets, or Manual
40 targets

2. Tracking

Automatic tracking of all acquired targets on
the display for 5 out of 10 consecutive scans
in 0.1 to 32 nm

3. Prediction of target motion

True or relative vectors, time scaled.
Length: 1 to 99 min

4. Past positions

5 or 10 past positions of tracked targets at
intervals of 2 min

3.Gyrocompass

Built-in interface accepts synchro signal (20­50 V, 50-400 Hz) or stepper signal (20-50
VDC, any polarity).

4. Speed log (IEC 61192-1 interface)

IEC 61192-1 contact closure or 200/400/500
pulses/nm.

POWER SUPPLY

1. FR/FAR-2815/2825

115/230 VAC, 1ø, 470 VA(2815), 500
VA(2825), DC set not available

2. FR/FAR-2825W/2855/2855W

Display unit: 115/230 VAC, 1ø, 500 VA
(2825W), 115 VAC, 1ø, 550 VA (2855/
2855W)
Antenna unit: 115/230 VAC, 1ø, 150 VA
(2825W/2855W), 230 VAC, 3ø, 120 VA, 380/
440 VAC, 3ø, 120 VA (2825W/2855W), 24 V,
30 W (2855)

3. FR/FAR-2835S/2835SW

Display unit: 115/230 VAC, 1ø, 500 W
Antenna unit: 220 VAC, 50-60 Hz, 3ø,
440 VA, 380/440 VAC, 50-60 Hz, 3ø, 440 VA

4. FR/FAR-2865SW

Display unit: 115 VAC, 1ø, 550 VA
Antenna unit: 220 VAC, 3ø, 50-60 Hz, 440
VA, 380/440 VAC, 3ø, 50-60 Hz, 440 VA

x

PROGRAM NUMBER

SPU Board

MAIN: 0359096132
SUB: 0359057134

ARP Board

ARP: 1859038106
SUB: 18590399101

RP Board

0359094111

EQUIPMENT LIST

Standard Supplies

1. Display unit
Radar: RDP-115 (w/RP-25)
ARPA: RDP-115A (w/ARP-25, RP-25)

2. Antenna unit with 30 m antenna cable

3. RF transceiver unit for RF-down system

4. PSU-004 for FR/FAR-2825W/2855W/
2835S/2835SW/2865SW

5. PSU-001 for FR/FAR-2855

6. Standard spare parts and installation
materials

Category of Equipment Units

Equipment for Protected Area

•Display unit

•Power supply unit

•RF transceiver unit

•Interswitch unit
Equipment for Exposed

•Antenna unit

•Performance monitor

Compass safe distance

See each corresponded Installation Manual.

Optional Supplies

1. Waveguide for RF-down system
(Coax cable for S-band)

2. Gyro interface GC-8

3. Interswitch box RJ-7 or 8

4. Performance monitor PM-30* (X-band),
PM-50* (S-band)

5. 42 rpm scanner motor
(FR/FAR-2815/2825 only)

6. 45 rpm scanner motor for HSC
(FAR-2835S only)

7. Video plotter RP-25**

8. ARP A Board ARP-25

9. Hand grip

10. Display pedestal

11. Interface unit IF-2300*
* Necessary in IMO-type Radar and ARPA

** RP-25 (Radar Video Picture) necessary for
all class of SOLAS ships for radar maps and
navlines
*** ARP-25 (Auto Radar Plotter) may not be
necessary on ships below 1,000 GT. Check
with the Administrations.

xi

FR/FAR-2855/2835S

ANTENNA UNIT

RW-6895

RW-4873 (for 2815/2825)

115/230 VAC, 1φ, 50/60 Hz
(Ant and disp for FR/FAR2815/2825)

2C 1.5 m

CO-SPEVV-SB-C

Interface

IF-2300

Interswitch

RJ-7.8

Radar system data
and target data in
IEC61162 chart data, etc.

NAV data (GLL ..)

Speed (VBW, VHW)
TRUE Heading (HDT)

Other Radar system

External Buzzer

xii

ANTENNA UNIT (Turning unit or Gearbox)

ledoMtinuannetnAepytrotoM

5182-RAF/RF

5282-RAF/RF

5582-RAF/RF

W5282-RAF/RF
W5582-RAF/RF

S5382-RAF/RF

WS5382-RAF/RF

3,CAV022/002 )φ

)CDV42,mpr02(0500-BSR5856-MR

3,CAV022/002 φ *)

3,CAV044/083 φ *)

1,CAV044/083 φ *)

3,CAV022/002 )φ

3,CAV022/002 )φ

dnab-SCSH

dnab-SCSH

dnab-SCSH

3,CAV022/002 )φ

3,CAV044/083 )φ

*)CDV42,mpr42(4700-BSR615-G8D
*)CDV42,mpr24(5700-BSR175-G8D
*)CDV42,mpr42(4700-BSR615-G8D
*)CDV42,mpr24(5700-BSR175-G8D

,)zH06(mpr02/)zH05(mpr61(9400-BSR

,)zH06(mpr62/)zH05(mpr12(6700-BSR

,)zH06(mpr62)zH05(mpr12(7700-BSR

,)zH06(mpr62)zH05(mpr12(8700-BSR

,)zH06(mpr62)zH05(mpr12(6200-BSR

,)zH06(mpr62)zH05(mpr12(1300-BSR

3,CAV022,mpr54(8800-BSR ,φ rof)zH05

3,CAV022,mpr54(9800-BSR φ )zH06,

3,CAV044,mpr54(0900-BSR φ )zH06,

,)zH06(mpr62)zH05(mpr12(7200-BSR

,)zH06(mpr62)zH05(mpr12(2300-BSR

2228-BOG

3218-MR

4218-MR

7428-MR

8937-MR

5347-MR

9159-MR

0259-MR

1259-MR

8937-MR

5347-MR

NOTE: The gearboxes marked * work with new radiators (such as XN12AF *). The new radiator
has different physical dimensions at the rotary joint and only fits on the new gear box. The slotted
waveguide array radiators are the same as the current ones. The gearing and motors are the
same as those in the former counterpart. Assembled antenna are compatible to each other within
the same for RF output.

RADIATOR

tf4*FA21-NXepyTtf8*FA42,A4-NXepyT

dnaB-X

tf5.6*FA02,A3,3-NXepyTtf01A5-NXepyT

tf21FA63-NStf01FA03-NSdnaB-S

8700/7700/6700/5700/4700-BSRrof*dekramsrotaidaR:ETON

xiii

WARNING

WARNING

Before turning on the radar, make sure that
there is no one near the antenna unit.
Serious injury or even death may result if
a rotating antenna strikes someone
standing nearby.

1.1 Turning on the Power

1. OPERATION

1.2 Transmitter ON

When the STANDBY status is displayed
on the screen, press the Transmit switch
labeled ST -BY/TX on the control panel of
the display unit.

The radar is initially set to previously used
range and pulsewidth. Other settings such
as brilliance levels, VRMs, EBLs and
menu option selections are also set to
previous settings.

The POWER switch is located at the lower
right corner of the display . Push it to switch
on the radar set. T o turn of f the radar, push
it again; the switch will extend. 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, or the transmitter tube, is warmed
for transmission. When the timer has
reached 0:00, the legend STBY appears
indicating that the radar is now ready to
transmit pulses.

POWER
ON
OFF

Power
switch

Location of power switch

In warm-up and standby condition, you
will see the message BRG SIG MISSING.
This is normal because a bearing signal
is not yet generated when the antenna is
not rotating. ON TIME and TX TIME val­ues shown at the bottom of the screen
are the time counts in hours and tenths
of hour when the radar has been pow­ered on and transmitted.

The Transmit switch toggles the radar be­tween ST ANDBY and TRANSMIT status.
The antenna stops in STANDBY status
and rotates in TRANSMIT status.

Notes:

1) If the antenna does not rotate in
TRANSMIT status, check whether the
antenna switch in the tuning compart­ment is in the OFF position.

2) The magnetron ages with time result­ing in a reduction of output power . It is
highly recommended that the radar be
set to ST ANDBY status when not used
for an extended period of time.

Quick Start

Provided that the radar was once in use with the
transmitter tube (magnetron) still warm, you can
turn the radar into TRANSMIT condition without
3-minutes standby. If the Power Switch has been
turned off by mistake or the like and you wish to
restart the radar promptly, follow the steps
below:

• Turn on the Power Switch not later than 5 sec
after power-off.

• Press the ST-BY switch in the tuning
compartment.

• Press the Transmit Switch STBY/TX.

Antenna switch

VECTOR

ORIGIN

VECTOR

TRUE/

REL

MARK

TIME

ST-BY switch

1-1

1.3 Controls

1-2

FR-2805 Series Radar Display Unit Overview

Main control panel

BRILLIANCE control
Adjusts brightness of
entire screen.

A/C RAIN control
Reduces clutter from
rain, snow and clouds.

A/C SEA control
Reduces sea clutter.

OFF ON

EBL

A/C

AUTO

A/C AUTO key
Reduces sea
clutter at pre­set level. Per­mits manual
override by
A/C SEA and
A/C RAIN
controls.

EBL ON/OFF control
Pressing ON key toggles
between No.1 EBL and
No.2 EBL. Bearing is
read either Relative or
True at the lower left
corner of the screen.

BRILL

FUNC4FUNC1 FUNC2 FUNC3

FUNCTION keys
#1 key: Setup 1
#2 key: Setup 2
#3 key: Setup 3
#4 key: Setup 4

A/C RAIN

A/C SEA

RANGE

GAIN control
Adjusts receiver
sensitivity.

TRANSMIT switch

RANGE keys
Selects range
scales.

OFF ON

ST-BY

GAIN

TX

ACQ

AUDIO

OFF

VRM

Trackball
Shifts cursor
on radar
screen.

ACQ key
Press key after
selecting target by
trackball. The target
will be acquired in
30 sec.

AUDIO OFF key
Silences aural alarm
(except guard alarm)
and ARP-23 (option)
generated alarm.

VRM ON/OFF keys and rotary control
Press ON to activate VRM. Turn
rotary control clockwise to increase
VRM diameter; counterclockwise to
decrease it. Read range at lower-right
hand corner of screen. There are two
VRMs which are toggled by each press
of ON key. Press OFF key to deactivate
each VRM.

GAIN, A/C RAIN, A/C SEA and BRILL controls are of push-and-rotate type. Push in
wanted switch lightly, and it will pop up. Rotate it to the wanted setting and push it in.
The retracted position of the controls provides a better protection for water splash.

1-3

Display controls

Mode Panel

HM

OFF

ORIGIN

GUARD

MARK

ALARM

X2

ZOOM

CU, TM

RESET

ECHO

TRAILS

VECTOR

EBL

TRUE/

OFFSET

REL

BKGR

COLOR

INT

REJECT

HM OFF

Temporarily erases the heading marker.

ECHO TRAILS

Shows trails of target echoes in the form
of simulated afterglow.

MODE

Selects presentation modes: Head-up,
Head-up/TB, North-up, Course-up and
True Motion.

GUARD ALARM

Used for setting the guard alarm.

EBL OFFSET

Activates and deactivates off-centering of
the sweep origin.

MODE

VECTOR

OFF

TIME

CENTER

INDEX
LINES

RINGS

X2 ZOOM

Enlarges a user-selected portion of pic­ture twice as large as normal. (R-type
only)

CU, TM RESET

Resets the heading marker to 000° in
course-up mode; moves own ship posi­tion to 50% radius in stern direction in the
true motion mode.

INT REJECT

Reduces mutual radar interference.

RINGS

Adjusts the brightness of range rings.

BKGR COLOR

Selects the background color.

INDEX LINES

Alternately shows and erases parallel in­dex lines.

1-4

Plotting keypad and tuning compartment

Keys for ARPA (FAR)

ORIGIN

MARK

ORIGIN

TARGET

MARK

DATA

TRIAL

MARK

VECTOR

TRUE/

REL

VECTOR

TARGET

TRUE/

BASED

REL

DATA

LOST

TARGET

CHART

ALIGN

Keys for RP-25 (option)

VECTOR

TIME

VECTOR

AUTO

TIME

PLOT

HISTORY

VIDEO

PLOT

RADAR

MENU

E,AUTO

PLOT

MENU

NAV

MENU

ORIGIN MARK

Show and erases the origin mark (a ref­erence point for range/bearing measure­ment).

VECTOR TRUE/REL

Selects true or relative vector.

VECTOR TIME

Sets vector length in time.

RADAR MENU

Opens and closes RADAR menus.

E-PLOT, AUTO PLOT MENU

Opens and closes E-Plot and optional
AUTO PLOT menus.

NAV MENU

Opens and closes NAV menu.

Keys 0-9

Select plot symbols. Also used for enter­ing numeric data.

AUTO

1 2 3

7 8 9

CANCEL

–

654

ENTER

9

AUTO

MANU

ON

ANTENNA

OFF

DEGAUSS

PM-ON/OFF

Keys for ARPA (optional in R-type)

TARGET DATA

Displays the acquired target data.

TARGET BASED DATA

Own ship's speed is measured relative to
a fixed target.

AUTO PLOT

Activates and deactivates the Auto Plot­ter.

TRIAL

Initiates a trial maneuver.

LOST TARGET

Silences the lost target audible alarm and
erases the lost target symbol.

HISTORY

Shows and erases past positions of
tracked targets.

TUNE

GYRO SET

HOLD

+
–

ERROR

STBY

CANCEL

Terminates plotting of a specified target
or all tracked targets.

ENTER

Used to save settings on menu screen.

Keys for Video Plotter (optional)

MARK Enter/erase marks

CHART ALIGN

Used to align chart data.

VIDEO PLOT

Turns the video plotter on/off.

1-5

1.4 CRT Brilliance

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 conditions, especially be­tween daytime and nighttime.

Brilliance
control

A/C RAIN GAINA/C SEA

BRILL

Note: The CRT brilliance should be ad­justed before adjusting relative brilliance
levels on the BRILLIANCE menu to be
explained later.

1.5 Tuning the Receiver

Auto tune

The radar receiver is tuned automatically
each time the power is turned on, thus
there is no front panel control for tuning
purpose. The tuning indicator and the la­bel AUTO TUNE at the top right corner of
the display unit show the tuning circuit is
working. If the label AUTO TUNE is not
displayed, check that the TUNE selector
in tuning compartment is in the AUTO
position.

2. Push the tune control so that it pops
up.

3. While observing the picture on the 48
mile scale, slowly adjust TUNE control
and find the best tuning point.

4. So the TUNE selector to AUTO and
wait for about 10 seconds or four scan­ner rotations.

5. Make sure that the radar has been set
to the best tuning point. This condition
is where the tuning indicator lights to
about 80% of its total length.

6. Push the TUNE control into the re­tracted position.

Video Lockup Recovery

Video lockup, or picture freeze, can occur unex­pectedly 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 of the power switch and turn it on again
within five seconds.

2. Push the ST-BY switch in the tuning compart­ ment.

3. Push the Transmit switch labeled ST-BY/TX
for Transmit status.

This LED lights if video lockup is associated
with fundamental malfunction of CPU.

Manual tune

If you are not satisfied with the current
auto tune setting, follow these steps to
fine-tune the receiver:

1. Set the TUNE selector in the tuning
compartment to MAN for manual tun­ing.

TUNE control

TUNE selector

VECTOR

ORIGIN

VECTOR

TRUE/

REL

MARK

TIME

1-6

ST-BY switch for
quick start

1.6 On-screen Legends and Markers

Heading

Presentation
mode

Pulselength
Interference

rejector

Echo stretch

No.1 EBL

No.2 EBL

Automatic
clutter

Noise
rejector

Off-center

Range and bearing of
cursor from own ship

Range ring
interval/Range

6/1 NM

1.5 NM

330.0°T
HEAD UP
RM
PULSE 1

310

IR3

300

ES1

290

280

270

260

250

240

230

A/C

AUTO
NOISE
REJ
OFFCENTER

EBL
>287.2°T<

239.6°T

320

220

PI

348.6°T

330

210

340

200

Parallel Index Line

No.1 EBL (upper)
No.2 EBL (lower)

mark

Heading
line

000

180

010

170

350

190

No.1 VRM

No.2 VRM

020

160

Guard zone

AUTO TUNE
ANT 1 MAIN

030

WATCH
11:30

040

1997
02/08

050

13:28*

130

140

150

North marker

Antenna/Radar in use

Tuning indicator

TRU

060

070

080

090

100

110

120

TGT ALARM
TRU TRAIL
30MIN
15:26

VRM
>5.65NM<

2.35NM

TRU

TRU

TRU

CPA 2.9NM TCPA *** MIN
BCR 8.9NM BCT 20MIN

OS
[GPS]
+

GYRO LOG EPSF
AZIMUTH HDG TRIG
VIDEO LOST TARGET
AUTO MAN TGT FULL
GZ COLLOSION SOG

No.1 VRM (upper)
No.2 VRM (lower)

Alarm clock

GYRO 132.7°
LOG 2.2KT

ARPA
REL VECTOR 6MIN

RNG 4.91NM

1

BRG 226.1°T
CSE 263.3°T
SPD 12.4KT

CPA 2.9NM TCPA *** MIN
BCR 8.9NM BCT 20MIN

RNG 4.91NM

2

BRG 226.1°T

CSE 263.3

SPD 12.4KT

CURRENT *.*KT
*.*°T
WIND *.*KT
*.*°R

°T

Target data
display
(See next
page.)

Fixed
range ring

Target alarm
ON

Echo trail
settings

Error Message
appears in red.

1-7

1.7 Degaussing the CRT Screen

Each time the radar is turned on, the de­gaussing circuit automatically demagne­tizes the CRT screen to eliminate color
contamination caused by earth's magne­tism or magnetized ship structure.

degaussed, the screen may be disturbed
momentarily with vertical lines. If you wish
to degauss by manual operation at an
arbitrary time, open and press the "DE­GAUSS" switch.

Gyro
LED

DEGAUSS switch

The screen is also degaussed automati­cally when own ship has made a signifi­cant course change. While being

1-8

VECTOR

ORIGIN

VECTOR

TRUE/

REL

MARK

TIME

Gyro readout
adjustment
switches

1.8 Initializing the Gyro

1.9 Presentation Modes

Readout

Provided that your radar is interfaced with
a gyrocompass, ship's heading is dis­played at the top of the screen. Upon turn­ing on the radar, align the on-screen
GYRO readout with the gyrocompass
reading by the procedure shown below.
Once you have set the initial heading cor­rectly, resetting is not usually required.
However, if the GYRO readout goes
wrong for some reason, repeat the pro­cedure to correct it.

1. Open the tuning compartment and
press the HOLD button. The Gyro LED
lights.

Gyro
LED

DEGAUSS switch

VECTOR

ORIGIN

VECTOR

TRUE/
REL

MARK

TIME

This radar has the following presentation
modes:

Relative Motion (RM)
Head-up: Unstabilised

Head-up TB:Head-up with compass-

stabilized bearing scale
(True Bearing)

Course-up: Compass-stabilized rela-

tive to ship's intended
course

North-up: Compass-stabilized with

reference to north

True Motion (TM)
North-up: Ground or sea stabilized

with compass and speed in­puts

Selecting presentation mode

Gyro readout
adjustment
switches

2. Press the UP or DOWN button to du­plicate the gyrocompass reading at the
on-screen GYRO readout. Each press
of these buttons changes the readout
by 0.1-degree steps. To change the
readout quickly , hold the UP or DOWN
button for over two seconds.

3. Press the HOLD switch when the on­screen GYRO readout has matched
the gyrocompass reading. The Gyro
LED goes out.

Note: The HOLD button is used to disen­gage the built-in gyro interface from the
gyrocompass input in the event that you
have difficulty in fine-adjusting the GYRO
readout due to ship's yawing, for example.
When initializing the GYRO readout at a
berth (where the gyrocompass reading is
usually stable), you may omit steps 1 and
3 above.

Press the MODE key on the mode panel.
Each time the MODE key is pressed, the
presentation mode and mode indication
at the upper-left corner of the screen
change cyclically.

HL

OFF

ORIGIN

GUARD
ALARM

MARK

ECHO

TRAILS

VECTOR

EBL

TRUE/

OFFSET

REL

MODE

VECTOR

OFF

CENTER

TIME

Loss of Gyro Signal

When the gyro signal is lost, the presentation
mode automatically becomes head-up and
the GYRO readout at the screen top shows
asterisks (***.*). The message SET HEADING
appears at the lower-left corner of the screen.
This warning stays on when the gyro signal is
restored, to warn the operator that the readout
may be unreliable. Press the MODE key to
select another presentation mode (the asterisks
are erased at this point). Then, align the GYRO
readout with the gyrocompass reading and press
the CANCEL key to erase the message SET
HEADING.

1-9

Presentation mode,
representative display

Description

North
marker

300

290

280

270

260

250

240

North
marker

300

290

280

270

260

250

240

Heading

000

350

340

330

320

310

230

220

210

200

190

180

line

010

020

030

040

050

060

070

080

090

100

110

120

130

140

150

160

170

Heading

000

010

350

340

330

320

310

230

220

210

200

190

160

170

180

line

020

030

040

050

060

070

080

090

100

110

120

130

140

150

Head-up Mode

A display withouth azimuth stabilization in which
the line connecting the center with the top of the
display indicates own ship's heading.

The target pips are painted at their measured dis­tances and in their directions relative to own ship's
heading.

A short line on the bearing scale is the north marker
indicating compass north. A failure of the gyro
input will cause the north marker to disappear and
the GYRO readout to show asterisks (***.*) and the
message SET HDG appears on the screen.

Course-up Mode

An azimuth stabilized display in which a line connect­ing 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 0-degree position while the
heading marker 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 [CU, TM RESET] key to
reset the picture orientation if you wish to continue
using the course-up mode.

North
marker

300

290

280

270

260

250

240

330

320

310

230

220

210

000

350

340

200

190

180

The bearing scale rotates with
a compass signal.

Heading

010

170

line

020

030

040

050

060

070

080

090

100

110

120

130

140

150

160

Head-up TB (True Bearing) Mode

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.

This mode is available only when the radar is inter­faced with a gyrocompass.

1-10

Presentation mode,
representative display

Description

North
marker

330

320

310

300

290

280

270

260

250

240

230

220

210

330

320

310

300

290

280

270

260

250

240

230

220

210

000

350

340

200

190

180

000

350

340

200

190

180

Heading
line

010

020

030

040

050

060

070

080

090

100

110

120

130

140

150

160

170

010

020

030

040

050

060

070

080

090

100

110

120

130

140

150

160

170

North-up Mode

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 marker changes its
direction according to the ship's heading.

If the gyrocompass fails, the presentation mode
changes to head-up and the north maker disappears.
Also, the GYRO readout shows asterisks (***.*)
and the messageSET HEADING appears at the
lower-left corner of the screen.

True Motion Mode

Own ship and other moving objects move in accord­ance with their true courses and speeds. All fixed
targets, such as landmasses, appear as stationary
echoes.

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 50% radius opposite to
the extension of the heading marker passing through
the display center. Resetting can be made at any
moment before the ship reaches the limit by pressing
the [CU, TM RESET] key. Automatic resetting is
preceded by a beep sound.

If the gyrocompass fails, the presentation mode is
changed to the head-up mode and the north marker
disappears. The GYRO readout at the top of the
screen shows asterisks (***.*) and the message SET
HEADING appears at the lower-left corner of the
screen.

Heading
line

300

290

280

270

260

250

240

350 000 010

340

330

320

310

230

220

210

200

(a) True motion
is selected

North

000 010

maker

020

030

040

050

060

070

080

090

100

110

120

130

140

150

160

170180190

310

300

290

280

270

260

250

240

230

350

340

330

320

220

210

200

020

030

040

050

060

070

080

090

100

110

120

130

140

150

160

170180190

(b) Own ship has reached a
point 75% of display radius

Automatic resetting of sweep center in true motion mode

000 010

350

340

330

320

310

300

290

280

270

260

250

240

230

220

210

200

020

030

040

130

140

150

160

170180190

(c) Own ship is automatically
reset to 50% of radius

050

060

070

080

090

100

110

120

1-11

1.10 Selecting the Range Scale

The display range scale is changed in 13
steps on the R-type (1 1 steps on the IMO­type) by pressing the [+] and [-] keys. The
selected range scale and range ring in­terval are shown at the upper left corner
on the screen.

htdiwesluP

dnegeL

dnab-Xdnab-S

)esluptrohS(S–80.0 µs

)1esluptrohS(1S70.0 µs–
)2esluptrohS(2S51.0 µs–

The display range can be expanded by
75% (100% in R-type) in any direction by
using the off-centering control.

1.11 Selecting the Pulsewidth

The pulsewidth in use is displayed at the
upper-left position of the screen using the
abbreviations shown in the table above.

Appropriate pulsewidths are preset to in­dividual range scales and function keys.
Therefore, you are not usually required
to select them. If you are not satisfied with
the current pulsewidth settings, however ,
it is possible to change them by the Ra­dar menu operation shown below.

You can choose the pulsewidth 1 or 2 on
the scales 0.5 to 24 nm ranges on X­band models (0.75 to 24 nm ranges on
S-band models).

Selecting pulsewidth 1 or 2

1. Press the RADAR MENU key on the
plotting keypad to show the FUNC­TIONS menu.

2. Press the [1] key to select menu item 1
PULSEWIDTH.

3. Press the [1] key to select (or highlight)
PULSEWIDTH 1 OR 2 as appropriate.

4. Press the ENTER key to conclude your
selection followed by the RADAR
MENU key to close the FUNCTION
menu.

)1eslupmuideM(1M3.0 µs3.0 µs
)2eslupmuideM(2M5.0 µs6.0 µs

)eslupgnoL(L2.1 µs2.1 µs

For FR/FAR-2855, 2855W and 2565SW,

0.3 µs becomes 0.2 µs.

Presetting pulsewidths 1 and 2

Pulsewidth 1 and 2 can be preset on the
Pulsewidth 1 and 2 menus. Shown below
are examples of the pulsewidth setup pro­cedure:

1. T o enable selection of S1 (0.07 µs) and
S2 (0.15 µs) pulsewidth on the 0.5 nm
range on an X-band model, select S1
at 0.5 nm on the PULSEWIDTH 1
menu and S2 at 0.5 nm on the PULSE­WIDTH 2 menu.

2. T o enable selection of S2 (0.15 µs) and
M1 (0.3 µs) pulsewidth on the 3 nm
range on an X-band model, select S2
at 3 nm in the PULSEWIDTH 1 menu
and M1 at 3 nm in the PULSEWIDTH
2 menu.

A longer pulse provides an increased de­tection range, but with reduced discrimi­nation. If you need discrimination in
preference to detection, choose a shorter
pulse.

Example: To select S1 (0.07 µs) as
Pulsewidth 1 for the 0.5 nm range, dis­play the PULSEWIDTH 1 menu following
the steps shown above and hit the [2] key
to choose "2 0.5 NM." Further hit the [2]
key until the menu option "S1" is high­lighted to the right of "2 0.5 NM."

1-12

Note: For FR-2815/2825, the menus on

the next page are for the R-type. Refer to
paragraph 1.32 or the menus on the IMO
type.

[RADAR 1]

1 [SYSTEM SETTING 1]
2 EBL1 (R-type only) REL/TRUE
3 EBL2 (R-type only) REL/TRUE
4
5
6 TRAIL REL/TRUE
7 TRAIL GRAD SGL/MULT
8 [PULSEWIDTH 1] (IMO-type only)
9 [PULSEWIDTH 2] (IMO-type only)
0 RADAR2

Hit [9].

1 [RADAR 1]
2 0.5 NM
3 0.75 NM
4 1.5 NM
5 3 NM
6 6 NM
7 12-24 NM

[PULSE WD 1]

Hit [8].

S1/S2
S1/S2
S1/S2/M1
S2/M1/M2
M1/M2/L
M2/L

-- (Blank on S-band)

-- (S/M1 on S-band)

-- (S/M1 on S-band)

-- (S/M1/M2 on S-band)

Hit [RADAR MENU].

[FUNCTIONS 1]

1 PULSE WIDTH
2 ECHO STRETCH
3 ECHO AVERAGE
4 PANEL DIMMER
5 ECHO COLOR
6 SHIP'S SPEED
7 INDEX LINES
8 SET/DRIFT

9 BRILLIANCE
0 [SYSTEM SETTING 1]

1/2
OFF/1/2
OFF/1/2/3
OFF/DIM/M/BRT
YEL/GRN/COLOR*
LOG/NAV*/MAN
NO.2 VRM/MAN
OFF/MAN
SET 000.0
DRIFT 00.0 KT

* R-type only

Hit [0].

1 [RADAR 1]
2 0.5 NM
3 0.75 NM
4 1.5 NM
5 3 NM
6 6 NM
7 12-24 NM

[PULSE WD 2]

S1/S2
S1/S2
S1/S2/M1
S2/M1/M2
M1/M2/L
M2/L

Hit [2].

-- (Blank on S-band)

-- (S/M1 on S-band)

-- (S/M1 on S-band)

-- (S/M1/M2 on S-band)

1 [FUNCTIONS 1]
2 RADAR 1
3 FUNCTION KEY 1
4 FUNCTION KEY 2
5 FUNCTION KEY 3
6 FUNCTION KEY 4
7 RADAR 2
8 ANCHOR WATCH
9
0 [SYSTEM SETTING 2]

[FUNCTIONS 2]

1/2

1-13

1.12 Adjusting the Sensitivity

CAUTION

The GAIN control is used to adjust the
sensitivity of the receiver, and thus the
intensity of echoes as they appear on the
screen. It should be adjusted so that
speckled background noise is just visible
on the screen.

To become acquainted with the way the
GAIN control works, try rotating it between
fully counterclockwise and clockwise po­sitions while observing the radar picture.
You will notice that clockwise rotation in­creases the echo intensity level. A low
gain setting results in the loss of weak
echoes and a reduced detection range. If
you turn the GAIN control too far clock­wise for an excessive gain setting, desired
echoes will be masked in the strong back­ground noise.

A/C SEA control
off

A/C SEA control
adjusted

Automatic anti-clutter control

The easiest way to suppress the surface
clutter is to use the automatic control.
Press the A/C AUTO key next to the EBL
rotary control at the left corner on the con­trol panel. Use of a function key is also a
good method for reducing sea clutter. For
this purpose, presetting is required. Con­sult a FURUNO representative.

GAIN control

OFF ON

A/C

AUTO

EBL

BRILL

A/C RAIN GAINA/C SEA

FUNC4FUNC1 FUNC2 FUNC3

1.13 Suppressing Sea Clutter

In rough weather conditions returns from
the sea surface are received over sev­eral miles around own ship and mask
close targets. This situation can be im­proved by properly adjusting the A/C SEA
(Anti-Clutter Sea) control.

OFF ON

EBL

A/C

AUTO

A/C AUTO key A/C SEA control

BRILL

A/C RAIN GAINA/C SEA

FUNC4FUNC1 FUNC2 FUNC3

CAUTION

The auto A/C function can erase weak
targets.

Manual anti-clutter control

From the fully counterclockwise position,
slowly turn the A/C SEA control clockwise.
For optimum target detection, you should
leave speckles of the surface return
slightly visible.

The anti-clutter sea control is often re­ferred to as STC (Sensitivity Time Con­trol) which decreases the amplification of
the receiver immediately after a radar
pulse is transmitted, and progressively
increases the sensitivity as the range in­creases.

A common mistake is to over-adjust the
A/C SEA control so that the surface clut­ter is completely removed. By rotating
the control fully clockwise, you will see
how dangerous this can be; a dark zone
is created near the center of the screen
and close-in targets can be lost. This dark
zone is even more dangerous if the gain

1-14

has not been properly adjusted. Always
leave a little surface clutter visible on the
screen. If no surface clutter is observed
(on a very calm water), set the control at
the fully counterclockwise position.

1.14 Suppressing Precipitation Clutter

In adverse weather conditions, clouds,
rain or snow produce a lot of spray-like
spurious echoes and impairs target de­tection over a long distance. This situa­tion can be improved by using a function
key provided that it is so programmed. If
the function key fails to offer a favorable
suppression of the rain clutter, adjust the
A/C RAIN control on the front control
panel.

A/C RAIN
control

1.15 Interference Rejector

Mutual radar interference may occur in the
vicinity of another shipborne radar oper­ating in the same frequency band (9 GHz
for X-band, 3 GHz for S-band). 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 reduced by activating the interference
rejector circuit.

The interference rejector is a kind of sig­nal correlation circuit. It compares the re­ceived signals over successive
transmissions and suppresses randomly
occurring signals. There are three levels
of interference rejection depending on the
number of transmissions that are corre­lated. These are indicated by the legends
IR1, IR2 and IR3 at the upper-left posi­tion of the screen.

OFF ON

A/C

AUTO

EBL

BRILL

A/C RAIN GAINA/C SEA

FUNC4FUNC1 FUNC2 FUNC3

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.

A/C RAIN control
OFF

A/C RAIN control
adjusted

Mutual radar interference

Press the INT REJECT key to activate the
interference rejector circuit. Successive
presses of the key increase the effect of
interference rejection, up to level 3. A
fourth press deactivates the interference
rejector. Switch of f the interference rejec­tor when no interference exists; otherwise
weak targets may be lost.

HL

OFF

ORIGIN

GUARD

MARK

ALARM

X2

ZOOM

ECHO

TRAILS

VECTOR

EBL

TRUE/

OFFSET

REL

BKGR

COLOR

MODE

VECTOR

OFF

TIME

CENTER

INDEX
LINES

CU, TM

RESET

INT

REJECT

RINGS

Inside mode panel

1-15