MARINE RADAR
FR-7062/7112/7252
MODEL
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SAFETY INSTRUCTIONS
DANGER
Stay away from transmitting antenna.
The radar antenna emits microwave radiation which can be harmful to the
human body, particularly the eyes. Never look directly into the antenna
radiator from a distance of less than 1 m when the radar is in operation.
Radio Frequency Radiation Hazard
The radar antenna emits electromagnetic radio frequency (RF) energy which can be
harmful, particularly to your eyes. Never look directly into the antenna aperture from a
close distance while the radar is in operation or expose yourself to the transmitting
antenna at a close distance.
Distances at which RF radiation levels of 100 and 10 W/m2 exist are given in the table
below.
Note: If the antenna unit is installed at a close distance in front of the wheel house,
your administration may require halt of transmission within a certain sector of antenna
revolution. This is possible—Ask your FURUNO representative or dealer to provide
this feature.
2
Distance to 100 W/m
point
Distance to 10 W/m2
point
Model
Radiator type
XN12A (4')
XN13A (6')
XN12A (4')
XN13A (6')
XN12A (4')
XN13A (6')
Worst case 2.5 m
Worst case 2.3 m
FR7062
Nil
(X-bnd, 6 kW)
Worst case 0.5 m Worst case 7.5 m
Worst case 0.3 m Worst case 7.0 m
Worst case 0.8 m Worst case 9.5 m
Worst case 0.7 m Worst case 9.0 m
FR7112
(X-bnd, 12 kW)
FR7252
(X-bnd, 25 kW)
i
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DANGER
Before turning on the radar
make sure no one is near the
scanner unit.
WARNING
Use the proper fuse.
Fuse rating is shown in the chapter 5.
Use of a wrong fuse can result in equipment
damage
Prevent the potential risk of
someone begin struck by the
rotating antenna and exposure
to RF radiation hazard.
Do not operate the equipment with wet
hands.
Electrical shock can result.
WARNING
CAUTION
No one navigation device should ever be
solely replied upon for the navigation of
a vessel.
Do not open the equipment.
Improper handling can result in electrical
shock. Only qualified personnel shold
work inside the equipment.
Always confirm position against all available
aids to navigation, for safety of vessel and
crew.
Do not disassemble or modify the
equipment.
The guard alarm is a useful anti-collision
aid, but does not relieve the operator of the
responsibility to also keep a visual lookout
for possible collision situations. The alarm
should never be used as the sole means for
detecting possible collision situations.
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.
Continued use of the equipment can
cause fire or electrical shock.
Do not place liquid-filled containers on
the top of the equipment.
Fire or electrical shock can result if a liquid
spills into the equipment.
ii
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SART (Search and Rescue Transponder)
ASearch and Rescue Transponder (SART) may be triggered by any X-Band (3 cm) radar
within a range of approximately 8 n.miles. Each radar pulse received causes it to transmit
a response which is swept repetitively across the complete radar frequency band. When
interrogated, it first sweeps rapidly (0.4 µsec) through the band before beginning a rela-
tively slow sweep (7.5 µsec) through the band back to the starting frequency. This process
is repeated for a total of twelve complete cycles. At some point in each sweep, the SART
frequency will match that of the interrogating radar and be within the pass band of the
radar receiver. If the SART is within range, the frequency match during each of the 12 slow
sweeps will produce a response on the radar display, thus a line of 12 dots equally spaced
by about 0.64 nautical miles will be shown.
When the radar to the SART is reduced to about 1 n.miles, the radar display may show
also the 12 respopnses generated during the fast sweeps. These additional dot responses,
which also are equaly spaced by 0.64 nautical miles, will be interspersed with the original
line of 12 dots. They will appear slightly weaker and smaler than the original dots.
Screen B: When SART
is close
Screen A: When SART
is distant
Radar antenna
beamwidth
Position
of SART
SART mark
length
Radar receiver
bandwidth
9500 MHz
9200 MHz
Sweep time
95 µs
7.5 µs
Low frequency sweep signal
Fast sweep signal
Sweep
starting
Showing SART marks on the radar display
To show the SART marks only on the radar display, detune the radar receiver by the
manual tuning out of best tuning condition. This erases or weakens all normal radar ech-
oes, but, the SART marks are not erased because the SART response signal scans over
all frequencies in the 9 GHz band. When the radar approaches the SART in operation, the
SART marks will enlarge to large arcs, blurring a large part of the screen. Reduce the
sensitivity and adjust the sea clutter control of the radar.
iii
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Summary to detect SART response
1. Use range scale of 6 or 12 nm as the spacing between the SART responses is about
0.6 nm (1125 m) to distinguish the SART.
2. Turn off the A/C AUTO function.
3. Turn off the Interference Rejector.
General remarks on receiving SART
Radar range scale
When looking for a SART it is preferable to use either the 6 or 12 nautical mile range scale.
This is because the total displayed length of the SART response of 12 (or 24) dots may
extend approximately 9.5 nautical miles beyond the position of the SART and it is neces-
sary to see a number of response dots to distinguish the SART from other responses.
SART range errors
When responses from only the 12 low frequency sweeps are visible (when the SART is at
a range greater than about 1 n.mile), the position at which the first dot is displayed may be
as mush as 0.64 n.mile beyond the true position of the SART. When the range closes so
that the fast sweep responses are seen also, the first of these will be no more than 150
meters beyond the true position.
iv
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FOREWORD
Congratulations on your choice of the
FURUNO FR-7062/7112/7252 Marine Radar.
We are confident you will see why the
FURUNO name has become synonymous with
quality and reliability.
Features
Your radar has a large variety of functions, all
contained in a remarkably small cabinet.
The main features of the model FR-7062 are
For over 40 years FURUNO Electric Company
has enjoyed an enviable reputation for innova-
tive and dependable marine electronics equip-
ment. This dedication to excellence is furthered
by our extensive global network of agents and
dealers.
¡ Traditional FURUNO reliability and qual-
ity in a compact, lightweight and low-cost
radar.
¡ Durable brushless antenna motor.
¡ On-screen alphanumeric readout of all op-
Your radar is designed and constructed to meet
the rigorous demands of the marine environ-
ment. However, no machine can perform its
intended function unless properly operated and
maintained. Please carefully read and follow
the recommended procedures for operation and
maintenance.
erational information.
¡ Standard features include EBL (Electronic
Bearing Line), VRM (Variable Range
Marker), Guard Alarm, Display Off Center,
and Echo Trail.
¡ Watchman feature periodically transmits the
radar to check for radar targets which may
have entered the alarm zone.
We would appreciate hearing from you, the end-
user, about whether we are achieving our pur-
poses.
¡ Ship’s position in latitude and longitude and
Loran C TDs, range and bearing to a
waypoint, speed, heading, and course can be
shown in the bottom text area. (Requires a
navigation aid which can output such data
in IEC 1162 format.)
Thank you for considering and purchasing
FURUNO equipment.
Note: In this manual, "N-type" means Nether-
lands specification radar.
¡ Zoom feature provided.
¡ Auto Plotter ARP-10 (option) acquires and
tracks up to 10 targets, and is installed in the
display unit.
¡ Cursor position data (TLL) can be output to
a plotter (option).
v
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TABLE OF CONTENTS
3.2 Index Lines ......................................3-1
3.3 Suppressing Radar Interference .......3-2
3.4 Selecting Pulsewidth........................3-2
3.5 Displaying Navigation Data ............3-3
3.6 Echo Trail.........................................3-4
3.7 Guard Alarm ....................................3-4
3.8 Watchman ........................................3-6
3.9 OTHER MENU Description............3-7
3.10 Function Keys ................................3-8
3.11 Adjusting Brilliance of Markers ....3-8
3.12 Suppressing Second-Trace Echoes 3-8
3.13 Suppressing Noise .........................3-8
3.14 Outputting Target Position .............3-8
3.15 Tuning the Receiver .......................3-8
FOREWORD ............................... v
MENU TREE ............................. vii
SYSTEM CONFIGURATION.... viii
1. PRINCIPLE OF OPERATION
1.1 What is Radar?.................................1-1
1.2 How Ships Determined Position
Before Radar ...................................1-1
1.3 How Radar Determines Range ........1-1
1.4 How Radar Determines Bearing ......1-1
1.5 Radar Wave Speed and Antenna
Rotation Speed ................................1-1
1.6 The Radar Display ...........................1-1
4. FALSE ECHOES
2. BASIC OPERATION
4.1 Multiple Echoes ...............................4-1
4.2 Side-lobe Echoes .............................4-1
4.3 Indirect Echoes ................................4-2
4.4 Blind and Shadow Sectors ...............4-2
2.1 Control Description .........................2-1
2.2 Display Indications and Markers .....2-2
2.3 Turning the Radar On/Off................2-3
2.4 Transmitting .....................................2-3
2.5 Stand-by ...........................................2-3
2.6 Selecting the Range .........................2-4
2.7 Adjusting Picture Brilliance.............2-4
2.8 Adjusting Receiver Sensitivity ........2-4
5. MAINTENANCE & TROUBLE-
SHOOTING
5.1 Preventative Maintenance................5-1
5.2 Replacing the Fuse...........................5-1
5.3 Troubleshooting ...............................5-2
5.4 Self Test ...........................................5-3
5.5 Life Expectancy of Magnetron ........5-3
2.9 Adjusting the A/C SEA Control
(reducing sea clutter).......................2-4
2.10 Adjusting the A/C RAIN Control
(reducing rain clutter)......................2-5
2.11 Selecting the Presentation Mode....2-6
6. ARP-10 (OPTION)
2.12 Erasing the Heading Marker,
6.1 General.............................................6-2
6.2 Keys Used for Auto Plotter ..............6-2
6.3 Activating the Auto Plotter ..............6-3
6.4 Manual Acquisition..........................6-4
6.5 Automatic Acquisition .....................6-4
6.6 Terminating Tracking of Targets......6-5
6.7 Displaying Target Data ....................6-5
6.8 Mode and Length of Vectors............6-6
North Marker..................................2-6
2.13 Magnifying Long Range Echoes
(echo stretch) ...................................2-6
2.14 Measuring the Range .....................2-7
2.15 Measuring the Bearing...................2-7
2.16 Using the Offset EBL ....................2-8
2.17 Shifting (off centering) the Picture 2-9
2.18 Zoom ..............................................2-9
SPECIFICATIONS ................ SP-1
INDEX .....................................IN-1
Declaration of Conformity
3. ADVANCED OPERATION
3.1 Basic Menu Operation .....................3-1
vi
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MENU TREE
MENU KEY
RINGS (Off, 1, 2, 3, max)
INDEX LINE (Off, On)
DISP DATA (NAV, Auto plotter, NAV and Auto plotter)
INT REJECT (Off, On)
ARP-10 MENU
OTHER MENU
1. Display
2. All Cancel
3. Vector Ref
4. Vector Length
5. History
Panel Dimmer (1, 2, 3, 4)
Mark Brill (1, 2, 3, 4)
HD Mark (1, 2, 3, 4)
Characters (1, 2, 3, 4)
Trail Tone (Single, Multi)
Pulselength (Short, Long)
Noise Reject (Off, On)
Trail Time
1.
2.
3.
4.
5.
6.
7.
8.
6. CPA SET
7. TCPA SET
8. AUTO ACQ
(With ARP-10 only.)
(15sec, 30sec, 1min, 3min, 6min, 15min, 30min, Cont)
Tune (Auto, Manual)
WPT Mark (Off, On)
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
EBL Ref (Rel, True)
VRM Unit (nm, km, sm)†
Watchman (Off, 5min, 10min, 20min)
STBY Disp (Norm, Econo, Nav)
Guard Mode (In, Out)
Own Position (L/L, TD)
Cursor Posi (B/R, L/L)
Alm Sense LV (Low, Mid, High)
Dead Sector (Off, On)
Range
(1/8, 1/4, 1/2, 3/4, 1, 1.5, 2, 3, 4, 6, 8, 12, 16, 24, 36, 48, 64, 72, 96)*
2nd Rej (Off, On)
Self Test
21.
22.
23.
Installation Setup
= Default setting
*Maximum range
FR-7062: 64
FR-7112: 72
FR-7252: 96
†: Not available on N-type radar.
vii
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SYSTEM CONFIGURATION
Scanner Unit
FR-7062
XN12A-RSB-0070-059
XN13A-RSB-0070-059
XN12A-RSB-0073-059
FR-7112
XN12A-RSB-0072-060
XN13A-RSB-0072-060
XN12A-RSB-0073-060
FR-7252
XN12A-RSB-0072-061
XN13A-RSB-0072-061
XN12A-RSB-0073-061
Radar Plotter
RP-110
Navigation
device
IEC 1162* (In/Out)
IEC 1162* (In/Out)
Display Unit
FR-7062/7112: RDP-122
FR-7252: RDP-123
Slave Display
FMD-811/8010
Video Sounder
Gyro
compass
Gyro Converter
AD-100
Auto Plotter
External Alarm
Buzzer OP03-21
#
ARP-10
Integrated Heading
Sensor PG-1000
Remote Display
FMD-1800
CVD Converter
RP-6065B
*Equivalent to NMEA 0183
Option
Rectifier
RU-3423,
RU-1746B-2
†RU-1746B-2 is available for FR-7252
using XN12A (48 rpm) and XN13A.
†
# Available with 24 rpm antenna only.
115/230 VAC
1ø, 50/60 Hz
FR-7062/7112: 12/24/32 VDC
FR-7252:
24/32 VDC
viii
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1. PRINCIPLE OF OPERATION
1.1 What is Radar?
1.4 How Radar Determines
Bearing
The term “RADAR” is an acronym meaning
RAdio Detection And Ranging. Although the
basic principles of radar were developed dur-
ing World War II, echoes as an aid to naviga-
tion is not a new development.
The bearing to a target found by the radar is
determined by the direction in which the radar
scanner antenna is pointing when it emits an
electronic pulse and then receives a returning
echo. Each time the scanner rotates pulses are
transmitted in the full 360 degree circle, each
pulse at a slightly different bearing from the
previous one. Therefore, if one knows the di-
rection in which the signal is sent out, one knows
the direction from which the echo must return.
1.2 How Ships Determined
Position Before Radar
Before the invention of radar, when running in
fog near a rugged shoreline, ships would sound
a short blast on their whistles, fire a shot, or
strike a bell. The time between the origination
of the sound and the returning of the echo indi-
cated how far the ship was from the cliffs or the
shore. The direction from which the echo was
heard indicated the relative bearing of the shore.
1.5 Radar Wave Speed and
Antenna Rotation Speed
Note that the speed of the radar waves out to
the target and back again as echoes is extremely
fast compared to the speed of rotation of the
antenna. By the time radar echoes have returned
to the scanner, the amount of scanner rotation
after initial transmission of the radar pulse is
extremely small.
1.3 How Radar Determines Range
Radar determines the distance to the target by
calculating the time difference between the
transmission of a radar signal and the reception
of the reflected echo. It is a known fact that ra-
dar waves travel at a nearly constant speed of
162,000 nautical miles per second. Therefore
the time required for a transmitted signal to
travel to the target and return as an echo to the
source is a measure of the distance to the tar-
get. Note that the echo makes a complete round
trip, but only half the time of travel is needed to
determine the one-way distance to the target.
This radar automatically takes this into account
in making the range calculation.
1.6 The Radar Display
The range and bearing of a target are displayed
on what is called a Plan Position Indicator (PPI).
This display is essentially a polar diagram, with
the transmitting ship’s position at the center.
Images of target echoes are received and dis-
played at their relative bearings, and at their
distance from the PPI center.
With a continuous display of the images of tar-
gets, the motion of the transmitting ship is also
displayed.
1-1
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Heading marker
Targets
Range and bearing
of a target, relative
to own ship, are
readable on the PPI.
A
D
A
D
B
B
C
C
Own ship
in center
Own ship
(radar)
(A) Bird's eye view of situation
(B) Radar picture of (A)
Figure 1-1 How radar works
1-2
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2. BASIC OPERATION
2.1 Control Description
Turns power on.
Press together with [STBY/TX] key
to turn power off.
(Control) Adjusts sensitivity of radar
receiver.
(Switch) Temporarily erases heading
marker (and north marker if displayed).
GAIN
POWER
HM OFF(PUSH)
Alternates between stand-by and
OFF
A/C SEA
transmit.
STBY
T X
(Control) Reduces sea clutter.
(Switch) Automatically reduces sea
and rain clutters.
A/C AUTO(PUSH)
NAV data and ARPA data can be
displayed individually or together.*
ECONOMY
A/C RAIN
F 1
ES(PUSH)
(Control) Reduces rain clutters.
(Switch) Enlarges echoes.
Suppresses electrical noise.*
F 2
Selects radar range.
RANGE
Selects presentation mode among
HU, CU, NU, and TM.
Adjusts display brilliance.
BRILL
MODE
(Long press) Doubles size of area
between your vessel and location
selected by cursor.
Sets/cancels guard alarm; silences
audible alarm.
SHIFT
ZOOM
GUARD
ALARM
Measures range and bearing
between two targets; predicts
collision course.
(Short press) Shifts your vessel's
position to cursor location.
ECHO
TRAIL
EBL
OFFSET
EBL 1
EBL 2
VRM 1
VRM 2
TLL
Displays target movement in
afterglow.
Turns corresponding VRM on/off.
(Long press) Outputs target data position
data to plotter.
(Short press) Alternately displays cursor
position display in lat/long or bearing/range.
(Functuion is available when nav data
is not displayed.)
Turns corresponding EBL on/off.
SELECT
CANCEL
(Long press) Terminates plotting of
the target selected with cursor.†
(Short press) Displays the data of
target selected with the cursor.†
ACQ
ENTER
MENU
Opens/closes menus.
(1) Acquires the target selected with
the cursor.†
(2) Registers selection on menus.
Trackball
(1) Shifts cursor, EBL and VRM.
(2) Sets guard zone.
(3) Selects items and options on
menu.
* Default switch function.
† Requires ARP-10 (option).
(4) Shifts origin of EBL and VRM.
Figure 2-1 Control panel
2-1
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2.2 Display Indication and Markers
Tuning status (P.3-8)
Tuning bar (P.3-8)
Echo trail elapsed time (P.3-4)
Heading (requires heading data)
Heading marker (P.2-6)
Echo trail time (P.3-4)
Guard Zone (P.3-4)
Zoom (P.2-9) or
Off center (P.2-9)
Range (P.2-4)
HDG 234.5°
TRAIL
AUTO
0. 125NM
0. 0625
SP
25 : 38 30min
Range ring interval (P.2-4)
Pulselength (P.2-4)
G (OUT)
ZOOM
ES1
Echo Stretch (P.2-6)
EBL2 (P.2-7)
HU RM
2ND
Display mode (P.2-6)
2nd-trace echo
suppressor (P.3-8)
ECHO
Guard zone area (P.3-4)
EBL1 (P.2-7)
Range ring (P.2-7)
VRM1 (P.2-7)
VRM2 (P.2-7)
Cursor (P.2-7)
Index lines (P.3-1)
North marker (P.2-6)
Noise rejector
(P.3-8)
NR
IR2
A/C
A/C AUTO (P.2-5)
AUTO
VRM
EBL/PI
345.6 R
23.0 R
0.048NM
0.100NM
EBL1 bearing (P.2-8)
EBL2 bearing (P.2-8)
13.5 R
0.142NM
Interference rejector
(P.3-2)
Cursor bearing (P.2-8)
VRM1 range (P.2-7)
VRM2 range (P.2-7)
Cursor range (P.2-7)
Figure 2-2 Display indications
2-2
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2.3 Turning the Radar On/Off
2.5 Stand-by
Press the [POWER] key to turn the radar on.
When you won’t be using the radar for an ex-
tended period, but you want to keep it in a state
of readiness, place it in stand-by by pressing
the [STBY/TX] key. The display shows
“STBY,” (default setting) navigation data, or
goes into the economy mode. (You can select
stand-by condition on the menu. More on menu
operation later.)
To turn the radar off, press the [POWER] key
together with the [STBY/TX] key.
When the radar is turned on, the control panel
lights and a timer displays the time remaining
for warm up of the magnetron (the device which
produces radar pulses), counting down from
1:30 to 0:01 (2:00 to 0:01 for FR-7252).
Economy mode
2.4 Transmitting
The CRT can be set to automatically turn itself
off when in stand-by, to reduce power consump-
tion. This feature is called the “economy mode”.
When the economy mode is on, the
“ECONOMY” indication under the [STBY/TX]
key lights.
After the power is turned on and the magnetron
has warmed up, STBY (Stand-By) appears at
the screen center. This means the radar is now
fully operational.
Press the [STBY TX] key to transmit.
Navigation data display during
stand-by
When transmitting, any echoes from targets
appear on the display. This radar displays ech-
oes in eight tones of green according to echo
strength.
If a navigation aid inputs navigation data to this
radar, navigation data can be displayed during
stand-by. You can turn the navigation data dis-
play on/off through the menu. Figure 2-3 shows
a typical navigation data display during stand-
by.
SPEED
TRIP
Time-to-go to Stand-by
Trip distance since power on
ST-BY
000.3 nm
Speed
10.5
kt
DEPTH
TEMPERA+TU1RE7.3
Depth
125
Temperature
m
°C
E
TO Waypoint bearing
Heading
HDG
092.5°
Course
CRS 180.0°M
*
Time-to-go to
TO Waypoint
WPT
BRG
RNG
TTG
01:08
45.0° M
12.0NM
*
N
S
Bearing to TO
OWN SHIP
Waypoint
LAT 30°00.00N
LON 135°00.00E
Ship's position in
latitude and longitude
and Loran TDs
TD
36378.1
59096.4
Range to TO Waypoint
XTE
R 0.3NM
Cross Track Error
"
" shows direction
and amount of error.
W
L
XTE
XTE
R
0.5
1.0
1.0
0.5
: "M" is not displayed on N-type radar.
*
Figure 2-3 Typical navigation data display
during stand-by
2-3
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Note 1:Availability of a particular display item
depends on incoming data.
2.8 Adjusting Receiver Sensitivity
The [GAIN] control adjusts the sensitivity of
the receiver. It works in precisely the same
manner as the volume control of a broadcast
receiver, amplifying the signals received.
Note 2:When Range to Waypoint reaches 0.1
nm, the WPT mark jumps to dead
ahead even though a difference may
exist between heading and BRG to
WPT.
The proper setting is such that the background
noise is just visible on the screen. If you set up
for too little sensitivity, weak echoes may be
missed. On the other hand excessive sensitivity
yields too much background noise; strong tar-
gets may be missed because of the poor con-
trast between desired echoes and the
background noise on the display.
Note 3:When cross track error exceeds 1 nm
on either side, the XTE mark starts
blinking.
2.6 Selecting the Range
The range selected automatically determines the
range ring interval, the number of range rings,
pulselength and pulse repetition rate, for opti-
mal detection capability in short to long ranges.
To adjust receiver sensitivity, transmit on long
range, and adjust the [GAIN] control so back-
ground noise is just visible on the screen.
2.9 Adjusting the A/C SEA
You can select which ranges and pulselength
(for 1.5 and 3 mile ranges) to use through the
menu. The range, range ring interval and
pulselength appear at the top left-hand corner
of the display.
Control (reducing sea clutter)
Echoes from waves can be troublesome, cover-
ing the central part of the display with random
signals known as “sea clutter”. The higher the
waves, and the higher the antenna above the wa-
ter, the further the clutter will extend. Sea clut-
ter appears on the display as many small echoes
which might affect radar performance. (See the
left-hand figure in Figure 2-4.) When sea clut-
ter masks the picture, adjust the A/C SEA con-
trol to reduce the clutter.
Selecting the range
Press the [- RANGE +] key. The range and range
ring interval appear at the top left corner on the
display.
Tips for selecting the range
¡ When navigating in or around crowded har-
bors, select a short range to watch for pos-
sible collision situations.
How the A/C SEA control works
The [A/C SEA] control reduces the amplifica-
tion of echoes at short ranges (where clutter is
the greatest) and progressively increases am-
plification as the range increases, so amplifica-
tion will be normal at those ranges where there
is no sea clutter.
¡ If you select a lower range while on open
water, increase the range occasionally to
watch for vessels that may be heading your
way.
2.7 Adjusting Picture Brilliance
The [BRILL] key adjusts the brilliance of the
radar picture in sixteen levels.
Press the [BRILL] key to set the brilliance level.
The current level momentarily appears on the
screen.
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Adjusting the A/C SEA control
2.10 Adjusting the A/C RAIN
Control
The proper setting of the A/C SEA should be
such that the clutter is broken up into small dots,
and small targets become distinguishable.
(reducing rain clutter)
The vertical beamwidth of the antenna 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, hail, etc.) in
the same manner as normal targets. Figure 2-5
shows the appearance of rain clutter on the dis-
play.
If the control is set too low, targets will be hid-
den in the clutter, while if it is set too high, both
sea clutter and targets will disappear from the
display. In most cases adjust the control until
clutter has disappeared to leeward, but a little
is still visible windward.
1. Confirm that the sensitivity is properly ad-
justed, and then transmit on short range.
Adjusting A/C RAIN
When rain clutter masks echoes, adjust the [A/
C RAIN] control. This control splits up these
unwanted echoes into a speckled pattern, mak-
ing recognition of solid targets easier.
2. Adjust the [A/C SEA] control so small tar-
gets are distinguishable but some clutter re-
mains on the display.
Appearance of
rain clutter
A/C RAIN control adjusted;
rain clutter suppressed.
Sea clutter at
display center
A/C SEA control adjusted;
sea clutter suppressed.
Figure 2-5 Effect of A/C RAIN
Figure 2-4 How to adjust the A/C SEA control
Tip for adjusting the A/C SEA
Note: In addition to reducing clutter, the [A/C
RAIN] control can be used in fine
weather to clarify the picture when navi
gating in confined waters. However,
with the circuit activated the receiver is
less sensitive. Therefore, turn off the
circuit when its function is not required.
A common mistake is to over-adjust the circuit
so all the clutter is removed. As an example set
up for maximum A/C SEA. You will see how
the center of the display becomes dark. This
dark zone can be dangerous (targets may be
missed), especially if the sensitivity is not prop-
erly adjusted. Always leave a little clutter vis-
ible on the display to be sure weak echoes will
not be suppressed. If there is no clutter visible
on the display, turn off the circuit.
Automatic adjustments of A/C SEA
and A/C RAIN
Push the [A/C SEA (A/C AUTO)] control. “A/
C AUTO” appears at the bottom left-hand cor-
ner of the display when the A/C AUTO circuit
is on. You can fine tune by adjusting the [A/C
SEA], [A/C RAIN] and [GAIN] controls.
CAUTION
Turn off the A/C SEA control when
its use is not required; the control
can erase weak targets.
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ally mask a target. To view the target, you can
temporarily erase the heading marker and north
marker by pressing and holding down the
[GAIN (HM OFF)] control. Release the con-
trol to re-display the markers.
2.11 Selecting the Presentation
Mode
This radar provides four presentation modes:
head-up, course-up, north-up and true motion.
Press the [MODE] key.
With heading sensor connection, the display and
the display mode indication at the top left-hand
corner of the display change in the sequence of
HU RM (Head-up), CU RM (Course-up), NU
RM (North-up) and NU TM (True Motion)
when the [MODE] key is pressed. If there is no
heading sensor connection, the display mode is
always HU RM.
Heading
marker
North marker
Figure 2-6 Heading marker and north marker
Note: The radar begins operation with last
selected display mode (except Course-
up) whenever the unit is turned on.
Note however that Head-up is selected
when Course-up was the last-used
mode.
2.13 Magnifying Long Range
Echoes (echo stretch)
Normally, the reflected echoes from long range
targets appear on the display as weaker and
smaller blips even though they are compensated
by the radar’s internal circuitry. The echo stretch
function magnifies these small blips in all
ranges. Two types of echo stretch are available:
ES1 which stretches echoes in bearing direc-
tion and ES2 which stretches them in both range
and bearing directions.
Head-up
The picture is oriented so the heading marker
is at the top of the display. This mode is useful
for navigation in congested waters.
Course-up
The Course-up mode shows ship’s heading by
the heading marker, at the top of the display. To
get heading desired, steer vessel in direction de-
sired, and then show “CU RM” at the top left-
hand corner of the display.
To turn the echo stretch on or off, press the
[A/C RAIN (ES)] control. Each press changes
the echo stretch function in the sequence of
ES1, ES2 and OFF. ES1 or ES2 appears at
the top right-hand corner of display when
echo stretch is on.
North-up
North is at the top of the display and the head-
ing marker moves with ship’s heading. This
mode is useful for determining ship’s position
and as a navigation monitor on a nautical chart.
The picture is stabilized against yaw of vessel,
thereby reducing smear of target echoes. Bear-
ing signal is required from a heading sensor.
Bearing
direction
Bearing
direction
Range
direction
True motion
Echo stretch 2
Echo stretch 1
True motion displays own ship and moving
objects in their true motion. Bearing signal and
speed signal are required from heading sensor
and speed sensor.
Figure 2-7 Echo stretch
Note1:This function magnifies not only targets
but also sea clutter and radar
interference. For this reason be sure the
controls for adjustment of sea clutter
and radar interference are properly
adjusted before activating the echo
stretch.
2.12 Erasing the Heading Marker,
North Marker
The heading marker or north marker (available
with gyrocompass connection) may occasion-
Note 2: ES2 is not available on short ranges.
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2.14 Measuring the Range
Range
6.0 NM
2.0
Range ring
interval
You can measure the range to a target three
ways: by the range rings, by the cursor, and by
the VRM (Variable Range Marker).
Target
Cursor
VRM1
VRM2
Measuring range by range rings
Count the number of rings between the center
of the display and the target. Check the range
ring interval and judge the distance of the echo
from the inner edge of the nearest ring.
VRM1
range
VRM
4.0 NM
3.0 NM
Cursor range
4.0 NM
VRM2
range
To turn the rings on or off, see the menu opera-
tion later (Chapter 3).
Figure 2-9 Measuring range by the cursor
and VRM
Measuring range by cursor
Operate the trackball to place the cursor inter-
section on the inside edge of the target echo,
The range to the target, as well as the bearing,
appears at the bottom of the display.
Note: You can display the range readout of
the VRM and cursor in nautical miles,
statute miles or kilometers. For details
see the next chapter.
Measuring by VRM
1. Press either [VRM 1] or [VRM 2] key. The
readout of the active marker is circum-
scribed.
2.15 Measuring the Bearing
There are two ways to measure the bearing to a
target: by the cursor, and by the EBL(Electronic
Bearing Line).
VRM
5.3 NM
12.5 NM
EBL
345.6°R
23.0°R
Measuring bearing by cursor
Operate the trackball to bisect the target with
the cursor intersection. The bearing to the tar-
get appears at the bottom of the display.
Figure 2-8 Display bottom, showing location
of EBL and VRM readouts
Measuring by EBL
1. Press the [EBL 1] or [EBL 2] key.
2. Operate the trackball to place the outside
edge of the VRM on the inside edge of the
target.The trackball must be operated within
five seconds after pressing a [VRM] key, oth-
erwise the corresponding VRM cannot be
operated. Press the [VRM] key again to ad-
just the VRM.
2. Operate the trackball to bisect the target with
the EBL.
The trackball must be operated within five
seconds after pressing an [EBL] key, other-
wise the corresponding EBL cannot be oper-
ated. Press the [EBL] key again to adjust the
EBL.
3. Check the VRM readout at the bottom right-
hand corner of the display to find the range
to the target.
3. Check the EBL readout at the bottom left-
hand corner of the display to find the bear-
ing to the target.
4. To anchor the VRM, press the [VRM] key
again.
4. To anchor the EBL, press the corresponding
[EBL] key again.
To erase the VRM, press and hold down the
corresponding [VRM] key about two seconds.
To erase the EBL and its readout, press and hold
down the corresponding [EBL] key about two
seconds.
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5. Operate the trackball to pass EBL1 through
the center of the target.
6.0 NM
2.0
Target
If the target tracks along the EBL towards the
center of the display (your vessel’s position),
the target may be on a collision course.
Cursor
EBL1
To cancel the offset EBL, press the [EBL OFF-
SET] key.
EBL2
Cursor
Bearing
6.0 NM
2.0
EBL
40.0° R
135.0° R
EBL1 bearing
EBL1 bearing
EBL1 origin
(initial position
of target)
40.0°R 4.0 NM
Figure 2-10 How to measure bearing by EBL
and cursor
Target moved
Offset EBL
(EBL1)
here.
Note: The bearing readout for the EBL and
the cursor can be displayed in relative
or true bearing (true bearing requires
heading sensor input). For North-up
and Course-up display modes the
bearing reference is always true.
EBL
70.0° R
VRM
6.0 NM
EBL1
bearing
VRM1
range
Figure 2-11 Predicting collision course by
using the offset EBL
Tips for measuring bearing
Measuring range and bearing between
two targets
¡ Bearing measurements of smaller targets are
more accurate; the center of larger target pips
is not as easily identified.
The procedure which follows shows how to
measure the range and bearing between target
“A” and target “B” in Figure 2-12.
¡ Bearings of stationary or slower moving tar-
gets are more accurate than bearings of faster
moving targets.
1. Operate the trackball to place the cursor on
the center of target “A”.
¡ To minimize bearing errors keep echoes in
the outer half of the picture by changing the
range scale; angular difference becomes dif-
ficult to resolve as a target approaches the
center of the display.
2. Press the [EBL 1] key to turn on EBL1.
3. Press the [EBL OFFSET] key. EBL1’s ori-
gin shifts to cursor location.
4. Press the [EBL 1] key.
2.16 Using the Offset EBL
5. Operate the trackball to bisect target “B” with
EBL1. Check the EBL1 readout to find the
bearing between target “A” and target “B”.
The offset EBL provides two functions: predict
collision course of radar target and measure the
range and the bearing between two targets.
6. Press the [VRM 1] key to turn on VRM1.
Operate the trackball to place the outside
edge of VRM1 on the inside edge of target
“B”. Check the VRM readout to find the
range between target “A” and target “B”.
Predicting collision course
1. Operate the trackball to place the cursor on
the center of the target.
2. Press the [EBL 1] key to turn on EBL1.
3. Press the [EBL OFFSET] key. EBL1’s ori-
gin shifts to cursor location.
4. After waiting several minutes, press the
[EBL 1] key again.
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To cancel, press the [EBL OFFSET] key.
2.18 Zoom
The zoom feature allows you to double the size
of the area between your vessel and any loca-
tion within the current range to take a closer
look at an area of interest.
EBL1
B
VRM1
A
1. Select location with the cursor.
2. Press and hold down the [SHIFT/ZOOM]
key about two seconds. ZOOM appears at
the top right corner when the zoom function
is on.
VRM
4.5 NM
EBL1
bearing
70.0° R
VRM1
range
Figure 2-12 Measuring the range and bearing
between two targets by using the offset EBL
Cursor
Cursor
2.17 Shifting (off centering) the
Picture
Your vessel’s position can be shifted up to 75%
of the range in use to view the situation around
your vessel without changing the range or size
of targets.
2
1
Press [F1] to zoom.
Place cursor
where desired.
Figure 2-14 Zoom function
Note: Zoom is cancelled when range or
presentation mode is changed.
1. Operate the trackball to set cursor where de-
sired.
2. Press the [SHIFT/ZOOM] key.
Cancelling zoom
OFFCENTER appears at the top right cor-
ner of the display when the picture is shifted.
Press the [SHIFT/ZOOM] key again.
Cursor
Cursor
1 Place cursor
2 Press SHIFT ZOOM
where desired.
key to off center display.
Figure 2-13 Shifting the picture
Cancelling shifted picture
Press the [SHIFT/ZOOM] key again.
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3. ADVANCED OPERATION
3.1 Basic Menu Operation
3.2 Index Lines
The menu mostly contains less-often used func-
tions which once preset do not require regular
adjustment. To open or close the menu, press
the [MENU] key. You can select items on the
menu with the trackball. The complete menu
appears at begining of this manual.
The index lines are useful for maintaining a
constant distance between own ship and a coast-
line or partner ship. They are linked with EBL2
and VRM2.
EBL2
1. Press the [MENU] key to display the main
menu.
Index lines
SSel by T-ball & press ENT.S
DISP
DATA
INT
REJECT
INDEX
LINE
RINGS
Change brill
from 3 to max.
ARP-10
MENU
OTHER
MENU
Figure 3-1 Main menu
Figure 3-3 Index lines
2. Operate the trackball to select the item. For
example, select RINGS. A message appears
at the bottom of the menu window.
Turning the index lines on/off
1. Press the [MENU] key.
2. Select “INDEX LINE” by the trackball.
3. Press the [ACQ/ENTER] key to select set-
ting. Each time this key is pressed,
the message changes. For the RINGS menu,
the message sequence is as shown below.
3. Select “Index Line on” by pressing the
[ACQ/ENTER] key.
4. Press the [ACQ/ENTER] key to confirm.
5. Press the [MENU] key to close the menu.
Change brill from Off to 1.
Change brill from 1 to 2.
Change brill from 2 to 3.
Change brill from 3 to max.
Change brill from max to Off.
“PI” indication appears next to EBL at the left
bottom corner of the screen.
To turn the index lines off, select “Index Line
off” and press the [ACQ/ENTER] key.
Rotating the index lines
1. Press the [EBL 2] key to activate EBL2.
2. Operate the trackball.
Adjusting the index lines interval
1. Press the [VRM 2] key to activate VRM2.
2. Operate the trackball.
Figure 3-2 Messages for RINGS menu
4. Press the [MENU] key to close the menu.
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3.3 Suppressing Radar
Interference
3.4 Selecting Pulsewidth
Pulsewidth is the transmission time of a single
radar pulse. The longer the pulsewidth the
greater the direction range capability, however
range accuracy and range resolution are re-
duced.
Radar interference may occur when near another
shipborne radar operating in the same frequency
band as your radar. Its on-screen appearance is
many bright dots either scattered at random or
in the form of dotted lines extending from the
center to the edge of the display. Figure 3-4 il-
lustrates interference in the from of curved
spokes. Interference effects are distinguishable
form normal echoes because they do not ap-
pear in the same place on successive rotations
of the antenna.
Pulsewidth can be selected to short or long on
the 1.5 and 3 nautical mile ranges.
1. Press the [MENU] key.
2. Select “OTHER MENU” and press the
[ACQ/ENTER] key.
[ OTHERS ]
TX
Select item by T-ball
and press ENTER key.
1 . Panel Dimmer
2 . Mark Brill
1
2
3
3
3
3
4
4
4
4
1
2
3 . HD Mark
1
2
4 . Characters
5 . Trail Tone
6 . Pulselength
7 . Noise Reject
8 . Trail Time
1
2
Single
Short
Off
15sec
Multi
Long
On
30sec 1min
3min 6min
15min 30min Cont
9 . Tune
Auto
Off
Manual
On
Figure 3-4 Radar interference
10. WPT Mark
11. EBL Ref
Rel
nm
True
Four levels of interference are available, includ-
ing off; IR1, IR2, IR3 and OFF. IR3 provides
the highest level of rejection.
†
12. VRM Unit
km
sm
13. Watchman
14. STBY Disp
15. Guard Mode
16. Own Position
17. Cursor Posi
Off
5min
10min 2200mminin
Norm
In
Econo Nav
Out
TD
L/L
L/L
1. Press the [MENU] key.
R/B
2. Select “INT REJECT” and press the [ACQ/
ENTER] key.
18. Alm Sense LV
19. Dead Sector
20. Range
Low
Med
On
Hig
1
Off
1/8 1/4
1/ 2 3/4
1.5
*
*
*
3
6
12
24 36 48
64 72 96
16
2
4
8
3. Select level desired by pressing the [ACQ/
ENTER] key.
21. 2nd Rej
22. Self Test
Off
On
23. Installation Setup
4. Press the [MENU] key to close the menu.
†: Not displayed on N-type radar; VRM unit is fixed for nm.
IR and level selected appears at the bottom right
corner on the display when the interference re-
jection circuit is turned on.
*Max. range is;
FR-7062: 64
FR-7112: 72
FR-7252: 96
Figure 3-5 OTHER MENU
3. Select “6. Pulselength” by operating the
trackball.
4. Select Short or Long by operating the
trackball.
5. Press the [ACQ/ENTER] key.
6. Press the [MENU] key to close the menu.
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To turn navigation data on or off
3.5 Displaying Navigation Data
Press the [F1] key if its function is set for DISP
DATA (default setting), or select DATA DISP
on the menu.
Navigation data can be displayed at the screen
bottom if this radar receives navigation input
in IEC 1162 format. Navigation data include;
¡ Position in latitude and longitude or Loran-
C time difference
¡ Range, bearing and time-to-go to both
waypoint selected on the navigator and the
cursor
¡ Speed.
(If the navigation input includes destination
data, waypoint position is denoted on the radar
display by a dashed ring.)
AUTO
TRAIL
HDG 234.5°
25:38
0. 125NM
30min
G (OUT)
ZOOM
ES1
0.0625
SP
HU RM
Waypoint Mark
A/C
AUTO
EBL/PI
345.6°R
23.0°R
VRM
"M" is not displayed on
N-type radar.
0.048NM
0.100NM
13.5°R
0.142NM
OWN SHIP
34° 56. 12N
135° 34. 56E
SPD 35.0KT
+
CURSOR
WAYPOINT
0.09 NM
Navigation
Data
34° 29. 98N
136° 35. 77E
TTG 01:00
50.0°M
TTG 00:20
Figure 3-6 Typical navigation data display
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Changing trail attributes
3.6 Echo Trail
Trail gradation and trail time can be selected
on the OTHER MENU.
You can show the movement of all radar tar-
gets relative to your vessel in afterglow. This
function is useful for alerting you to possible
collision situations.
Table 3-1 Trailing attributes
Items in
OTHERS
menu
Starting echo trail
Description
Press the [ECHO TRAIL] key.
TRAIL, the echo trail time selected (on
“OTHER MENU”) and elapsed time appear at
the top right-hand corner of the display. Then,
afterglow starts extending from all targets.
Trails can be shown in
single or multiple
gradations. Multiple paints
trails getting thinner with
time just like the afterglow
on an analog PPI radar.
Trail Tone
Trail Time
Multiple
Single
Trails can be set for 15
sec., 30sec., 1min., 3min.,
6min., 15min., 30min., or
continuous.
Figure 3-7 How the echo trail feature works
Note: Trails are restarted when range or
mode is changed or zoom or shift is
turned on.
3.7 Guard Alarm
The guard alarm allows the operator to set the
desired range and bearing for a guard zone.
When ships, islands, landmasses, etc. violate the
guard zone an audible alarm sounds and the
offending target blinks to call the operator’s at-
tention.
Fixed time trail
1. When the elapsed time clock counts up to
the trail time selected, the elapsed time dis-
play freezes.
2. The oldest portions of trails are erased so
only the latest trail, equal in length to the
trail time selected, is shown.
Selection of guard zone type
The guard alarm can be set to sound when a
target enters or exits the guard zone. You can
select which type of guard alarm you want
through the menu.
3. Trail continues.
For example, the one minute trail time is se-
lected. When the elapsed time clock counts up
to 60 seconds, the elapsed time display freezes
at “60,” but the latest one minute of trail is
erased and then trail continues.
In alarm
The alarm sounds on targets entering the guard
zone. “G (IN)” appears at the top right-hand
corner when the In alarm is selected.
Continuous trail
Out alarm
The maximum continuous trail time is 99 min-
utes and 59 seconds. When the elapsed time
clock counts up to that time the elapsed time
display is reset to zero and trail begins again.
The alarm sounds on targets exiting the guard
zone. “G (OUT)” appears at the top right-hand
corner when the Out alarm is selected.
Cancelling echo trail
Press the [ECHO TRAIL] key again.
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Asterisk blinking
Guard zone
* G (IN)
to set
A
Dashed line:
no alarm
A
B
D
C
Drag cursor
here.
Guard
zone
IN ALARM
OUT ALARM
(1) Mentally create
the guard zone to set.
(2) Drag cursor to
top left corner of
zone and press
[GUARD ALARM].
Figure 3-8 In and Out alarm
Setting a guard zone
Preparation
G (IN)
G (IN)
1. Press the [MENU] key, and then select
“OTHER MENU,” and press the [ACQ/EN-
TER] key.
Guard
zone
C
Drag cursor
here.
2. Select “15. Guard Mode” and “In” (alarm
on target entering zone) or “Out” (alarm on
target exiting zone) by operating the
trackball.
(3) Drag cursor to
bottom right corner
of zone and press
[GUARD ALARM].
(4) Guard zone
completed.
3. Press the [ACQ/ENTER] key.
4. Press the [MENU] key to close the menu.
To set a guard zone
Figure 3-9 How to set the guard zone
Silencing the audible alarm
1. Mentally create the guard zone you want to
set. For example, the guard zone shown in
Figure 3-9 (1).
Any radar targets violating the guard zone will
trigger the audible alarm. You can silence the
audible alarm by pressing the [GUARD
ALARM] key. When this is done, “G(ACKN)”
replaces “G(IN).” This means the alarm is ac-
knowledged. Press the key again to reactivate
the alarm.
2. Operate the trackball to set the cursor on
point A or B. Press the [GUARD ALARM]
key. “*G (IN)” or “*G (OUT)”, with aster-
isk blinking, appears at the top right-hand
corner of the display. See Figure 3-9 (2). (The
asterisk indicates the guard zone is partially
set.)
Cancelling the guard zone and alarm
Press and hold down the [GUARD ALARM]
key until the guard zone disappears.
3. Operate the trackball to set the cursor on
point C or D. See Figure 3-9 (3).
4. Press the [GUARD ALARM] key. The as-
terisk disappears. See Figure 3-9 (4).
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Notes on the guard alarm
Turning on watchman
¡ The alarm is a useful anti-collision aid, but
does not relieve the operator of the respon-
sibility to also keep a visual lookout for pos-
sible collision situations.
1. Create a guard zone (usually 360 degrees)
with the guard alarm function.
2. Press the [MENU] key.
3. Select “OTHER MENU”.
4. Press the [ACQ/ENTER] key.
5. Select “13. Watchman”.
¡ When the radar range is less than one half of
the guard zone range, the guard zone disap-
pears and “G (IN)” or “G (OUT)” appears
in inverse video. If this happens, raise range
to re-display the guard zone.
6. Operate the trackball to select watchman rest
period; 5 minutes, 10 minutes or 20 minutes.
¡ A target echo does not always mean a land-
mass, reef, ships or surface objects but can
imply returns from sea surface or precipita-
tion. As the level of these returns varies with
environment, the operator should properly
adjust the A/C SEA, A/C RAIN and GAIN
to be sure the alarm system does not over-
look target echoes.
7. Press the [ACQ/ENTER] key.
8. Press the [MENU] key to close the menu.
“WATCHMAN” appears at the top of the
screen, the radar transmits for one minute to
check for targets inside the guard zone, and then
the CRT shuts off and the radar goes into stand-
by.
3.8 Watchman
Cancelling watchman
The watchman function periodically transmits
the radar for one minute to check for targets in
a guard zone. If it finds change in the zone from
the previous transmission the audible alarm
sounds and the radar transmits continuously.
This feature is useful when you do not need the
radar’s function continuously but want to be
alerted to radar targets in a specific area.
Go into the “OTHER MENU” , and set “13.
Watchman” for off.
Note 1:Watchman can be used without a guard
zone.
Note 2:The alarm sounds just before the radar
starts and stops transmitting.
Tx
St-by
St-by
Tx
1 min
5, 10 or
20 min
1 min
5, 10 or
20 min
Watchman
starts.
Figure 3-10 How watchman works
How watchman works
When the time selected for the watchman rest
period has elapsed, the radar automatically
transmits for one minute to check the condition
inside the guard zone. If there is no change, the
radar goes into stand-by (“WATCHMAN” ap-
pears during stand-by.) If there is change, the
radar sounds the audible alarm, cancels the
watchman function and transmits continuously.
3-6
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3.9 OTHER MENU Description
The table below summarizes the OTHER MENU.
Table 3-2 OTHER MENU Description
Description
Selects level of panel backlight.
Item
1. Panel Dimmer
2. Mark Brill
Selects brilliance of VRM, EBL, cursor, guard zone and WP
marks.
3. HD Mark
Selects brilliance of heading marker.
Selects brilliance of characters.
Selects gradations of echo trails.
Selects pulselength for 1.5 and 3 mile ranges.
Select “On” to reject noise.
4. Characters*
5. Trail Tone
6. Pulselength
7. Noise Reject
8. Trail Time
9. Tune
Selects the trail time.
Selects automatic or manual tuning.
To tune manually;
1. Select “Manual” by the trackball.
2. Press the [ACQ/ENTER] key to enable manual tuning.
3. While pressing and holding down the [GAIN] control, operate
the trackball. (adjustment range;
FR7062:1.0-11.9V, FR7112/7252:1.0-32 V)
4. Press the [MENU] key to close the menu.
“MANUAL” appears at the top right-hand corner when manual
tuning is in effect.
10. WPT Mark
Selects “On” to display the waypoint mark.
11. EBL Ref
Selects EBL reference for relative or true.
12. VRM Unit†
Selects distance unit of VRM and cursor for nm, km or sm.
13. Watchman
14. STBY Disp
Turns watchman on (set rest period) or off.
Selects the condition at stand-by; display “STBY” or navigation
data, or go into the economy mode.
15. Guard Mode
16. Own Position
Selects condition which triggers guard alarm; in or out.
Displays the own ship's position in lat/long or Loran C TDs.
(Requires NAV data.)
17. Cursor Posi
18. Alm Sense LV
19. Dead Sector
Displays the cursor position in range/bearing or lat/long.
Selects minimum echo strength which triggers guard alarm.
Select “On” to display the dead sector, which shows the area
where the radar is not transmitted.
20. Range
Selects ranges to use.
21. 2nd Rej
22. Self Test
Select “On” to suppress second-trace echoes.
Tests keys, ROM and RAM, checks antenna rotation speed, and
displays program no.
23. Installation Setup For technicians.
*: Level 1 and 2 are same brilliance while the menu is displayed. The brilliance changes after
the menu is erased.
†: Can not be selected on N-type radar; VRM unit is fixed for nm.
3-7
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3.10 Function Keys
3.12 Suppressing Second-Trace
Echoes
The function keys (F1 and F2) work like the
auto-dialing feature of a telephone, automati-
cally executing the function assigned to them.
The assigned function can be turned on/off by
pressing appropriate function key again.
In certain situations, echoes from very distant
targets may appear as false echoes (second-trace
echoes) on the screen. This occurs when the re-
turn echo is received one transmission cycle
later, namely, after a next radar pulse has been
transmitted. To suppress them, select “2nd Rej
On” on the OTHER MENU.
Default settings
F1: Display NAV/ARPA data
F2: Noise rejector
3.13 Suppressing Noise
How to program function keys
1. Press the [MENU] key.
Electrical noise can be suppressed by turning
on “7. NOISE REJ” on the OTHER MENU.
2. Press [F1] or [F2] to open the function menu.
This function is available by pressing the [F2]
key (default setting).
[ SETTING FOR F1 KNOB ]
SSel by T-ball & press ENT.S
Press MENU key to escape.
3.14 Outputting Target Position
DISP
DATA
INT
REJECT
STBY
DISP
RINGS
Target position data can be output to a plotter
in IEC 1162 format. Press and hold down the
[TLL] key to output the data. This function re-
quires position data and heading signal.
PULSE
LENGTH
NOISE
REJECT
TRAIL
TIME
TRAIL
TONE
TUNE
A/M
GUARD
IN/OUT
ALARM
LEVEL
DEAD
SECTOR
3.15 Tuning the Receiver
MARK
BRILL
WATCH
MAN
PANEL
CHARA
CTERS
DIMMER
The radar receiver can be tuned automatically
or manually, and the default tuning method is
automatic. In automatic tuning, the radar is au-
tomatically tuned everytime the radar is
switched to “Tx” and the indication “TUNING”
appears during tuning.
EBL
REF
OTHER
MENU
VRM
UNIT
INDEX
LINE
WPT
MARK
OWN
POSITN
CURSOR
POSITN
ARP-10
MENU
The tuning bar at the top right-hand corner of
the display shows tuning condition. Generally,
the longer the tuning bar the better the tuning
condition, however the length of the bar changes
with number of radar echoes, range and other
factors. Current tuning method is shown above
the tuning bar as either “AUTO” or
“MANUAL.”
ALL
VECTOR
LENGTH
VECTOR
REF
ARP-10
DISP
CANCEL
HIS
TORY
NO
FNCTN
COLLI
SION
AUTO
ACQ
Figure 3-10 Function menu
3. Select function desired.
For how to tune the receiver manually, see "9.
Tune" on page 3-7.
4. Press the [ACQ/ENTER] key.
5. Press the [MENU] key to close the menu.
Note: Automatic tuning may not work
properly if own ship’s radar receives the
radar wave of another ship’s radar.
If this is the case, the radar will be out
of tune. Press the [STBY/TX] key twice
to retune.
3.11 Adjusting Brilliance of
Markers
“2. Mark Brill” on the OTHER MENU adjusts
the brilliance of markers such as the cursor.
3-8
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4. FALSE ECHOES
Occasionally false echoes appear on the screen
at positions where there is no target. In some
cases the effects can be reduced or eliminated.
The operator should familiarize himself or her-
self with the appearance and effects of these
false echoes, so as not to confuse them with
echoes from legitimate contacts.
4.2 Side-lobe Echoes
Every time the antenna rotates, some radiation
escapes on each side of the beam—called
“side-lobes.” If a target exists where it can be
detected by the side-lobes as well as the
main-lobe, the side-lobe echoes may be repre-
sented on both sides of the true echo at the same
range, as shown in Figure 4-2. Side-lobes show
usually only at short ranges and from strong tar-
gets. They can be reduced through careful re-
duction of the sensitivity or proper adjustment
of the A/C SEA.
4.1 Multiple Echoes
Multiple echoes occur when a short range,
strong echo is received from a ship, bridge, or
breakwater. A second, a third or more echoes
may be observed on the display at double, triple
or other multiples of the actual range of the tar-
get as shown in Figure 4-1. Multiple reflection
echoes can be reduced and often removed by
decreasing the sensitivity or properly adjusting
the A/C SEA.
True echo
Main-lobe
Side-lobe
Spurious
target
True
echo
Antenna
Figure 4-2 Side-lobe echoes
Own ship
Multiple
echo
Figure 4-1 Multiple echoes
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4.3 Indirect Echoes
4.4 Blind and Shadow Sectors
Indirect echoes may be returned from either a
passing ship or returned from a reflecting sur-
face on your own ship, for example, a stack. In
both cases, the echo will return from a legiti-
mate contact to the antenna by the same indi-
rect path. The echo will appear on the same
bearing of the reflected surface, but at the same
range as the direct echo. Figure 4-3 illustrates
the effect of an indirect echo. Indirect echoes
may be recognized as follows:
Funnels, stacks, masts, or derricks in the path
of antenna may reduce the intensity of the ra-
dar beam. If the angle subtended at the antenna
is more than a few degrees a blind sector may
be produced. Within the blind sector small tar-
gets at close range may not be detected while
larger targets at much greater ranges may be
detected. See Figure 4-4.
Vessel taller
Mast, etc. in
than wharf
path of radar
beam
• they usually occur in a shadow sector
Wharf
• they appear on the bearing of the obstruc-
tion but at the range of the legitimate con-
tact
• when plotted, their movements are usually
abnormal, and
Wharf
• their shapes may indicate they are not direct
echoes.
Blind sector
(no echo)
Size of blind sector
depends on target
size and range.
Heading
line
Direct
path
Figure 4-4 Blind and shadow sectors
Target
Indirect
path
Obstruction
(mast, funnel.
etc.)
Antenna
Target
True
echo
Indirect
path
Indirect
Direct
path
echo
Heading
line
Own
ship
True
echo
Bridge
Indirect
echo
Indirect
echo
Figure 4-3 Indirect echoes
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5. MAINTENANCE & TROUBLESHOOTING
This chapter tells you how to keep your radar in
good working order. Before reviewing this chap-
ter please read the safety information which fol-
lows.
A maintenance program should be established and
should at least include the items listed in Table 5-
1.
5.2 Replacing the Fuse
DANGER
Turn off the power before
The fuse in the fuse holder at the back of the dis-
play unit protects the equipment against reverse
polarity of ship's mains, overcurrent, and equip-
ment fault. If the fuse blows, find the cause be-
fore replacing it. Never use an incorrect fuse -
serious damage to the equipment may result and
void the warranty.
performing any maintenance or
troubleshooting procedure.
Hazardous voltages can shock, burn or cause death.
Only qualified personnel totally famillier with electrical
circuits should work inside the units.
RF RADIATION HAZARD
FR-7062/7112 is shipped with a 15Afuse for 12V
ship's mains. If the ship's mains is 24/32V, change
the fuse to 10 A (supplied).
The radar scanner emits high frequency
radio radiation which can be harmful,
particularly to your eyes.
Never look directly into the scanner from a distance of
less than two feet when the radar is in operation as
you could injure the cornea of your eyes. Always
make sure the radar is set to stand-by or is turned off
before starting work on the scanner unit.
FR-7252 is supplied with a 10A fuse for 24/32
V ship's mains.
CAUTION
Use the proper fuse.
5.1 Preventive Maintenance
Regular maintenance is important for good per-
formance. Always keep the equipment as free as
possible from dirt, dust, and water splashes. Make
sure all screws securing the components are prop-
erly tightened.
Use of a wrong fuse can result in
equipment damage.
Table 5-1 Recommended maintenance program
Period
Item
Check point
Remarks
3 to 6
months
Exposed
nuts and
bolts on
Check for corroded or loosened
nuts and bolts. If necessary,
clean and repaint them thickly.
Sealing compound may be used
instead of paint. Apply a small
amount of grease between nuts
and bolts for easy removal in
future.
scanner unit Replace them if heavily
corroded.
Scanner
radiator
Check for dirt and cracks on
radiator surface. Thick dirt should (acetone) for cleaning. If you
be wiped off with soft cloth
dampened with fresh water. If a
crack is found, apply a slight
amount of sealing compound or
adhesive as a temporary
Do not use plastic solvent
need to remove ice from scanner
unit, use a wooden hammer or
plastic head hammer. Crack on
the unit may cause water
ingress, causing serious
damages to internal circuits.
remedy, then call for repair.
6 months Display unit Check for tight connection and
to 1 year connectors corrosion.
If corroded, contact your dealer
for replacement.
5-1
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5.3 Troubleshooting
Table 5-2 contains simple troubleshooting pro-
cedures which you can follow to try to restore
normal operation. If you cannot restore normal
operation, do not attempt to check inside any unit
of the radar system. Any repair work is best left
to a qualified technician.
Table 5-2 Troubleshooting table
Then...
the control panel does • try adjusting the control panel back-
If...
But...
you pressed the
[POWER] key to turn not light
on the radar
lighting on the OTHERS menu.
• battery may have discharged.
• check fuse in power cable.
nothing appears on
• try adjusting the brilliance.
the display or display
contrast is poor
characters are
distorted
• request service.
the radar has
warmed up and you rotate
pressed the
[STBY TX] key to
transmit
the scanner does not
• the problem may be in scanner unit.
Request service.
characters and
indications are
abnormal
• have a qualified technician check the
set.
you have adjusted
the gain with A/C
RAIN and A/C SEA
off
neither noise nor
targets appear
(indications and
markers do)
• check signal cable for damage.
neither indications nor • check signal cable for damage.
markers appear (noise
and targets do)
the sweep (radial line
sweeping around the
display) is not
• the problem may be in the scanner
unit. Request service.
synchronized with
scanner rotation
there is no change in • request service.
sensitivity
a key is pressed
nothing happens
• key may be faulty. Request service.
5-2
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6. Press the [ACQ/ENTER] key to check the
display circuit. The following pattern
should appear.
5.4 Self Test
The self test facility checks the keyboard, ROM
and RAM for proper operation.
<Press MENU for OTHERS menu.>
1. Press the [MENU] key.
2. Select “OTHER MENU”.
3. Select “22. Self Test” and press the [ACQ/
ENTER] key. The following display appears.
[Self Test]
Key test: Press each key and
check on-screen indication
lights.
Figure 5-2 Test pattern
ARP-10 TEST
ROM
RAM
OK 18590271xx
OK
7. To return to the Self Test menu, press the
[MENU] key.
SPEED OK NAV 0.0KT
COURSE OK
TRIGGER NG
167.6°
VIDEO
BP
HP
NG
OK
OK
8. To escape from the self test, press the [MENU]
key.
MIN-HIT
0003
0854
00
00
0000
SCAN-TIME
MAN-ACQ
AUTO-ACQ
FE-DATA1
FE-DATA2
0000
5.5 Life Expectancy of
Magnetron
Program No. : 0359146-1xx
ROM
RAM
: OK
: OK
The following table shows the life expectancy of
the magnetrons.
Hours in use : 000006.9H
Tx hours : 000001.1H
<Press MENU for OTHER menu.>
Table 5-3 Life expectancy of magnetrons
Figure 5-1 Self test screen
Model
Type
Code no.
Life expectancy
E3560
000-139-050
4. The ROM and RAM are automatically
checked. If NG (No Good) appears to the right
of ROM or RAM indication, contact your
dealer for advice. ARP-10 TEST results ap-
pear only when optional ARP-10 board is
mounted.
FR-7062
MG5389 000-135-146
MG5241 000-100-036
2,000-3,000 hours
(Including stand-by)
FR-7112
FR-7252
E3566
M1458
–
000-140-344
MG5436 000-140-762
5. To check the keyboard, press any key except
[ACQ/ENTER] and [POWER] keys. The
pressed key's on-screen location lights in black
while the key is pressed, if the key is operat-
ing properly.
5-3
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6. ARP-10 (OPTION)
WARNING
CAUTION
The plotting accuracy and response of
this auto plotter meets IMO standards.
Tracking accuracy is affected by the
following:
No one navigational aid should be relied
upon for the safety of vessel and crew.
The navigator has the responsibility to
check all aids available to confirm
position. Electronic aids are not
a substitute for basic navigational
principles and common sense.
• Tracking accuracy is affected by course
change. One to two minutes is required to
restore vectors to full accuracy after an
abrupt course change. (The actual
amount depends on gyrocompass
specifications.)
• The amount of tracking delay is inversely
proportional to the relative speed of the
target. Delay is on the order of 15—30
seconds for high relative speed; 30—60
seconds for low relative speed.
• This auto plotter automatically tracks an
automatically or manually acquired radar
target and calculates its course and
speed, indicating them by a vector. Since
the data generated by the auto plotter
are based on what radar targets are
selected, the radar must always be
optimally tuned for use with the auto
plotter, to ensure required targets will not
be lost or unwanted targets such as sea
returns and noise will not be acquired
and tracked.
Display accuracy is affected by the
following:
• Echo intensity
• A target does not always mean a land-
mass, reef, ships or other surface vessels
but can imply returns from sea surface
and clutter. As the level of clutter changes
with environment, the operator should
properly adjust the A/C SEA, A/C RAIN
and GAIN controls to be sure target
echoes are not eliminated from the
radar screen.
• Radar transmission pulsewidth
• Radar bearing error
• Gyrocompass error
• Course change (own ship or target)
6-1
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6.1 General
6.2 Keys Used for Auto Plotter
The Auto Plotter ARP-10 is an optional circuit
board which is accommodated in the display
unit of the FR-7062 radar.
TheAuto plotter utilizes the following touchpad
keys. Given below is a brief description of these
keys.
The Auto Plotter permits manual or automatic
acquisition and automatic tracking of up to 10
radar targets. An internal microprocessor cal-
culate target data such as speed and course and
displays the results in alphanumeric and by vec-
tors. To ensure the reliability of the displayed
target data, the radar must be properly adjusted
for minimum sea returns and noise.
MENU:
Displays/Erases the main menu.
SELECT/CANCEL:
(Long press) Terminates plotting of the target
selected with the cursor.
(Short press) Displays the data of target selected
with the cursor.
Principal specifications
ACQ/ENTER:
Acquisition and tracking
Acquires the target selected with the cursor.
• Acquisition of up to 10 targets between 0.2
ARP-10 MENU operation
The ARP-10 MENU includes the followings:
Display:
and 16 nm.
• Automatic tracking of up to 10 acquired tar-
gets between 0.1 and 16 nm.
Turns on/off the plot symbols, past positions
and target data.
Vectors
Vector length: 30 s, 1, 3, 6, 15, 30 min.
Orientation: True velocity or relative velocity
All Cancel:
Cancels the tracking of all targets.
Past positions
Vector Ref:
5 past positions at intervals of 15, 30 s, 1, 2, 3,
6 min.
Selects relative vector or true vectors.
Alarm
Vector Length:
Visual and audible alarms against targets vio-
lating CPA/TCPA limits; visual alarm against
lost targets.
Selects vector time.
History:
Selects past position plot interval.
Target discrimination
CPA Set:
A target measuring about 800 m or more in the
radial or circumferential direction is regarded
as a landmass and not acquired or tracked. Ech-
oes smaller than about 800 m are regarded as
true targets.
Selects CPA alarm limit. When a target is pre-
dicted to come within this limit, an aural alarm
sounds and at the same time the corresponding
target symbol changes to a blinking triangle.
Note: If the preset CPA limit is set at OFF, a
target which is on collision course will not pro-
duce an alarm.
NOTICE
Heading data required for plotting
function.
TCPA Set:
Selects TCPA alarm limit.
Auto ACQ:
Turns on/off Auto Acquisition Area.
6-2
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6.3 Activating the Auto Plotter
[ ARP MENU ]
Select item by T-ball
and press ENTER key.
To activate theARP-10, follow the steps shown
below.
1 . Display
Off
On
2 . All Cancel
3 . Vector Ref
4 . Vector Length
1. Adjust the GAIN, A/C SEA and A/C RAIN
controls for proper radar picture.
Rel
True
30sec 1min
15min 30min
30sec 1min
6min
3min
Off
6min
15sec
3min
0.5nm 1nm
5nm
2. Press the [MENU] key to open the main
menu.
5 . History
2min
Off
6 . CPA Set
7 . TCPA Set
8 . Auto ACQ
2nm
3. Operate the trackball to select “ARP-10
MENU”.
6nm
3nm
30sec 1min
2min
6min
On
3min
4min
Off
5min
12min
4. Press the [ACQ/ENTER] key. The menu
shown in Figure 6-1 appears.
Figure 6-1 ARP menu
5. Operate the trackball to select the menu item
“1. Display”.
6. Operate the trackball to select “On”.
7. Press the [ACQ/ENTER] key.
8. Press the [MENU] key to close the menu.
Target is being tracked but is not selected
for data readout
AUTO
TRAIL
HDG 234.5°
Threatening
target
25:38
30min
8
2 NM
G (OUT)
AUTO TARGET
ZOOM
ES1
FULL
Target Full
Mark
SP
HU RM
Target selected
for data reading
(large square)
Auto
Acquisition
Area
Lost Target
A/C
AUTO
EBL/PI
345.6°R
23.0°R
VRM
0.048NM
0.100NM
13.5°R
0.142NM
COURSE 287.8°T
BEARING 42.5°T
TRUE VECTOR
15 MIN
SPEED 12.5 KT
RANGE 5.36 NM
ARPA Data Area
TCPA
12:35
CPA
2 NM
Figure 6-2 ARP display
6-3
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Note 3: When auto acquisition mode (Auto
ACQ) is on, up to five targets can be acquired.
For details, see 6.5 Automatic Acquision.
Deactivating the auto plotter
1. Press the [MENU] key.
2. Open the “ARP-10 MENU”.
3. Operate the trackball to select the “1. Dis-
play”.
WARNING
4. Operate the trackball to select “Off”.
5. Press the [ACQ/ENTER] key.
When a tracked target nears another
tracked target, the targets may be
"swapped." When two targets come close
to each other, one of the two can become
a "lost target." Should this happen,
6. Press the [MENU] key to close the menu.
reacquisition of the "lost target" is required
after the two targets have separated.
6.4 Manual Acquisition
Follow the steps below to manually acquire a
target. Up to 10 targets can be manually ac-
quired.
6.5 Automatic Acquisition
1. Place the cursor (+) on a target of interest by
operating the trackball.
The ARP-10 can acquire up to five targets au-
tomatically by setting the AutoAcquisition area
predefined in the system. If Auto ACQ is se-
lected after more than five targets have been
manually acquired, only the remaining capac-
ity of targets can be automatically are acquired.
For example; when seven targets acquired
manually, then the Auto ACQ is switched on,
only three targets can be acquire automatically.
When five targets have been automatically ac-
quired, “AUTO TARGET FULL” message ap-
pears at top left corner seven on the display.
2. Press the [ACQ/ENTER] key.
The plot symbol changes its shape according to
the status as below. A vector appears in about
one minute after acquisition indicating the
target’s motion trend. If the target is consistently
detected for three minutes, the plot symbol
changes to a solid mark. If acquisition fails, the
target symbol blinks and disappears shortly.
SQUARE (dotted)
Setting auto acquisition area
Immediately after acquisition - Plot symbol
shown in broken lines.
Auto acquisition area is predefined between 2.0
and 2.5 nm in range and 45º on either side of
the heading maker in bearing. If a target comes
into this area, it is acquired automatically.
SQUARE (dotted with a vector)
One minute after acquisition - Vector still unre-
liable.
CIRCLE (Solid with a vector)
3 minutes after acquisition - Plot symbol
changes to a solid circle indicating the stable
tracking condition.
LARGE SQUARE
Figure 6-4 Auto acquisition area
The plot symbol of a target being tracked be-
comes twice as large as the normal symbol when
the target is selected for data reading.
Follow the steps below to activate the auto ac-
quisition area.
1. Open the “ARP-10 MENU”.
Note 1: The target to be acquired should be
within 0.2 to 16 nm from own ship and not ob-
scured by sea or rain clutter.
2. Select “8. Auto ACQ” by operating the
trackball.
Note 2: When you want to acquire 11th target,
cancel tracking one of less important targets.
3. Operate the trackball to select “On”.
4. Press the [ACQ/ENTER] key.
5. Press the [MENU] key to close the menu.
6-4
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6.6 Terminating Tracking of
Targets
When the ARP-10 has acquired 10 targets, no
more acquisition occurs unless targets are lost.
Should this happen, cancel tracking of indi-
vidual targets or all targets by the procedure
described below.
Place the cursor on a wanted target and press
the [SELECT/CANCEL] key. Data on the se-
lected target is displayed at the bottom of the
screen. The symbol of the selected target gets
twice as large as the normal circle. The data in-
cludes the following;
Individual targets
Place the cursor (+) on the target which you do
not want to be tracked any longer by operating
the trackball and press and hold down the [SE-
LECT/CANCEL] key.
RNG/BRG (Range/Bearing): Range and bear-
ing from own ship to the last-plotted or selected
target position with suffix “T” (True) or “M”
(Magnetic). For true bearings suffix “T” is used
in case of gyrocompass input and suffix “M” is
used in case of magnetic compass input.
All targets
Tracking of all targets can be canceled from the
ARP-10 MENU.
1. Open the “ARP-10 MENU”.
2. Select “2. All Cancel”.
Note: “M” is not displayed on N-type radar.
3. Press the [ACQ/ENTER] key.
COURSE/SPEED (Course/Speed): Course
and speed are displayed for the last-plotted or
selected target with suffix “T” (True) or “M”
(Magnetic). For true bearings suffix “T” is used
in case of gyrocompass input and suffix “M” is
used in case of magnetic compass input.
6.7 Displaying Target Data
The ARP-10 calculates motion trends (range,
bearing, course, speed, CPA and TCPA) of all
targets being tracked at the ARPA Data area.
Note: “M” is not displayed on N-type radar.
To turn ARPA data on;
CPA (Closest Point of Approach): The clos-
est range a target will approach to own ship.
Do not confuse it with the operator preset CPA
alarm limit.
1. Press the [MENU] key.
2. Select the “DISP DATA”.
3. Press the [ACQ/ENTER] key to select the
message for “ARP” or “NAV and ARP”.
TCPA: The time to CPAmeasured with present
speeds of own ship and the targets. Both CPA
and TCPA are automatically calculated. When
a target ship has passed clear of own ship, the
CPA is displayed and the TCPA appears as
“**.*”. TCPA is counted up to 99.9 min. and
beyond this it is indicated as TCPA>99.9 min.
4. Press the [ACQ/ENTER] key to set.
5. Press the [MENU] key to close the menu.
6-5
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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 ra-
dar controls are properly adjusted and theARP-
10 is set up so that it can track targets effectively.
6.8 Mode and Length of Vectors
True or relative vector
Target vectors are displayed in relative or true
mode. Own ship does not have a vector in rela-
tive mode.
CPA/TCPA alarm ranges must be set up prop-
erly taking into consideration the size, tonnage,
speed, turning performance and other charac-
teristics of own ship.
Vector length
From the ARP-10 MENU, Vector Length can
be set to 30 seconds, 1, 3, 6, 15 or 30 minutes
and the selected vector time is indicated on the
screen.
The vector tip shows an estimated position of
the target after the selected vector time elapses.
It can be valuable to extend the vector length to
evaluate the risk of collision with any target.
Past position display
The ARP-10 displays equally time-spaced dots
(maximum 5 dots) marking the past positions
of any targets being tracked.
Follow the steps shown below to set the CPA/
TCPA alarm ranges:
If a target changes its speed, the spacing will be
uneven. If it changes course, its plotted course
will not be a straight line in TM mode.
1. Open the “ARP-10 MENU”.
2. On the “CPA Set” line, select a CPA limit
desired. (Off, 0.5, 1, 2, 3, 5, 6 nm)
Operational warnings
There are two main situations which cause the
ARP-10 to trigger visual and audible alarms:
3. Press the [ACQ/ENTER] key.
4. On the “TCPASet” line, select a TCPAlimit
desired. (30s, 1, 2, 3, 4, 5, 6, 12M)
• CPA/TCPA alarm
• Lost target alarm
CPA/TCPA alarm
5. Press the [ACQ/ENTER] key.
6. Press the [MENU] key to close the menu.
Visual and audible alarms are generated when
the predicted CPA and TCPA of any target be-
come less than their preset limits. The audible
alarm continues for 10 seconds.
The flashing of the triangle plot symbol and
vector remains on the screen until the danger-
ous situation is no longer present or you inten-
tionally terminate tracking of the target by using
the [SELECT/CANCEL] key.
The ARP-10 continuously monitors the pre-
dicted range at the Closest Point of Approach
(CPA) and predicted time to CPA (TCPA) of
each tracked target to own ship.
Lost target alarm
When the system detects a loss of a tracked tar-
get, the target symbol becomes a flashing dia-
mond.
When the predicted CPAof any target becomes
smaller than a preset CPA alarm range and its
predicted TCPA less than a preset TCPA alarm
limit, the ARP-10 releases an audible alarm. In
addition, the target plot symbol changes to a
triangle and flashes together with its vector.
6-6
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SPECIFICATIONS OF MARINE RADAR
FR-7062/7112/7252
1. GENERAL
(1) Indication System
PPI Daylight display, raster scan, 8 tones in monochrome
(2) Range, Pulselength (PL) & Pulse Repetition Rate (PRR)
(range max. FR-7062: 64 nm, FR-7112: 72 nm, FR-7252: 96 nm)
Range (nautical miles)
PL PRR
0.125 0.25 0.5 0.75
1
1.5
2
3
4
6
8
12 16 24 36 48 64 72 96
SP 2100 Hz
MP 1200 Hz
LP 600 Hz*
0.08 µs
0.3 µs
0.8 µs
*550 Hz on 48 nm to 72 nm range, or 500 Hz on 96 nm range
(3) Range Resolution
(4) Bearing Discrimination
(5) Minimum Range
Better than 20 m
XN12A: within 1.9º, XN13A: within 1.2º
25 m (0.25 NM range)
Within 1º
(6) Bearing Accuracy
(7) Range Ring Accuracy
0.9 % of range or 8 m, whichever is the greater
2. SCANNER UNIT
(1) Radiator
Slotted waveguide array
Horizontal
(2) Polarization
(3) Antenna Rotation Speed 24 rpm nominal: XN12A (100 kt max.), XN13A (100 kt max.)
48 rpm nominal: XN12A (70 kt max.)
(4) Radiator Length
(5) Horizontal Beamwidth
(6) Vertical Beamwidth
(7) Sidelobe Attenuation
XN12A:
XN12A:120 cm, XN13A: 180 cm
XN12A: 1.9°, XN13A: 1.2°
22°
Within ±20° of main-lobe: less than -24 dB
Outside ±20° of main-lobe: less than -30 dB
Within ±10° of main-lobe: less than -24 dB
Outside ±10° of main-lobe: less than -30 dB
XN13A:
3. TRANSCEIVER MODULE
(1) Frequency
9410 MHz ±30MHz (X band)
P0N
(2) Modulation
(3) Peak Output Power
(4) Modulator
FR-7062: 6 kW, FR-7112: 12 kW, FR-7252: 25 kW
FET Switching Method
SP - 1
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(5) Intermediate Frequency
(6) Tuning
60 MHz
Automatic or manual
(for manual, select manual tuning on menu and tune by trackball)
MIC (Microwave IC)
(7) Receiver Front End
(8) Bandwidth
Tx pulselength 0.08 s and 0.3 s: 25 MHz
Tx pulselength 0.8 s: 3 MHz
Circulator with diode limiter
(9) Duplexer
4. DISPLAY UNIT
(1) Indication System
(2) Picture Tube
PPI Daylight display, raster scan, 8 colors
12 inch rectangular (184 mm x 245 mm) monochrome CRT
effective display area more than 180 mm
(3) Range, Range Interval, Number of Rings
(range max. FR-7062: 64 nm, FR-7112: 72 nm, FR-7252: 96 nm)
Range (NM)
0.125 0.25 0.5 0.75 1 1.5 2
3
4
1
4
6
2
3
8 12 16 24 36 48 64 72 96
Ring Interval (NM) 0.0625 0.125 0.125 0.25 0.25 0.5 0.5 1
2
4
3
4
4
4
6 12 12 16 18 24
Number of Rings
(4) Markers
2
2
4
3
4
3
4
3
4
3
4
4
4
4
Heading Line, Bearing Scale, Range Rings,
Variable Range Marker (VRM1, VRM2),
Electronic Bearing Line (EBL1, EBL2),
Tuning Bar, Cursor, Parallel Cursor,
Alarm Zone, Waypoint Mark (navigation input required),
North Mark (heading sensor input required)
(5) Alphanumeric Indications Range, Range Ring Interval, Pulselength(SP, MP, LP),
Display Mode(HU, CU, NU, TM),
Interference Rejection(IR1, IR2, IR3),
Variable Range Marker(VRM1, VRM2),
Electronic Bearing Line (EBL1, EBL2),
Automatic A/C SEA (A/C AUTO), Stand-by (ST-BY),
Radar Alarm (G(IN), G(OUT), G(ACKN)),
Echo Stretch (ES1, ES2), Cursor Range, Bearing or L/L Position,
Echo Tailing (TRAIL), Trailing Time, Trailing Elapsed Time,
Navigation Data(navigation input required),
Heading (HDC, heading sensor input required)
NMEA0183 (Ver.1.5/2.0), current loop
(6) Input Data
Own ship’s position:
GGA>RMC>RMA>GLL (GLL is available Ver.1.5 only)
Speed:
RMC>RMA>VTG>VHW
Heading (True):
HDT>HDG*1>HDM*1>VHW>VHW*1
SP - 2
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Heading (Magnetic):
Course (True):
HDM>HDG*1>HDT*1>VHW>VHW*1
RMC>RMA>VTG
Course (Magnetic):
VTG>RMC>RMA
Waypoint(Range, Bearing): RMB>BWC>BWR
Loran time difference:
Water depth:
Water temperature:
Time:
RMA>GLC>GTD
DPT>DBT>DBK>DBS
MTW>MDA
ZDA
XTE:
RMB>XTE>APB
*1: calculate by magnetic drift.
NMEA0183(Ver.1.5/2.0), RS-422
TLL (target data) and RSD
(7) Output Data
5. ENVIRONMENTAL CONDITION
(1) Ambient Temperature
Scanner Unit: -25°C to +70°C
Display Unit: -15°C to +55°C
95 % or less at +40°C
(2) Relative Humidity
(3) Waterproofing
Scanner Unit
IPX6
Display Unit
Chassis: not specified
Panel: IPX4
6. POWER SUPPLY & POWER CONSUMPTION
(1) Power Supply
FR-7062/7112: 12/24/32 VDC (10.8 to 41.6 VDC)
FR-7252: 24/32 VDC (21.6 to 41.6 VDC)
(2) Voltage and Current
FR-7062
XN12A(24rpm): 12 VDC/7.5A, 24VDC/3.8A, 32VDC/2.8A
XN12A(48rpm): 12 VDC/8.8A, 24VDC/4.4A, 32VDC/3.3A
XN13A(24rpm): 12VDC/10A, 24VDC/5A, 32VDC/3.8A
XN12A(24rpm): 12 VDC/8.3A, 24VDC/4.2A, 32VDC/3.1A
XN12A(48rpm): 12 VDC/10A, 24VDC/5A, 32VDC/3.8A
XN13A(24rpm): 12 VDC/10.8A, 24VDC/5.4A, 32VDC/4.1A
XN12A(24rpm): 24VDC/5.2A, 32VDC/3.9A
FR-7112
FR-7252
XN12A(48rpm): 24VDC/5.8A, 32VDC/4.4A
XN13A(24rpm): 24VDC/6.3A, 32VDC/4.7A
(3) Power Consumption
FR-7062
XN12A(24rpm): 70 W to 90 W(100 kt)
XN12A(48rpm): 85 W to 105 W(70 kt)
SP - 3
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XN13A(24rpm): 80 W to 120 W(100 kt)
XN12A(24rpm): 85 W to 100 W(100 kt)
XN12A(48rpm): 95 W to 120 W(70 kt)
XN13A(24rpm): 90 W to 130 W(100 kt)
XN12A(24rpm): 105 W to 125 W(100 kt)
XN12A(48rpm): 120 W to 140 W(70 kt)
XN13A(24rpm): 115 W to 150 W(100 kt)
FR-7112
FR-7252
7. DIMENSIONS AND MASS
See Outline Drawings
8. CORTING COLOR
(1) Display Unit
Panel: N3.0
Chassis: 2.5GY5/1.5
N9.5
(2) Scanner Unit
9. COMPASS SAFE DISTANCE
(1) Display Unit
(2) Scanner Unit
FR-7062/7112
FR-7252
Standard: 1.1 m
Steering: 0.8 m
Standard: 1.0 m
Standard: 1.7 m
Steering: 0.8 m
Steering: 1.3 m
10. ARP MODULE (OPTION)
(1) Acquisition Range
(2) Tracking Range
0.2 to 16 NM
0.1 to 16 NM
(3) Maximum Number of Target 10
(4) Acquisition Time
(5) Alarm Timing
Within 5 sec (scanner rotation: 24 rpm)
Lost target (blink mark, collision alert)
(6) Vector Length
30 sec; 1, 3, 6, 15 or 30 min (selected on menu)
15, 30 sec; 1, 2, 3 or 6 min (selected on menu)
Distance, Bearing, Course, Speed, CPA, TCPA
(7) Plotting Interval
(8) Numeric Data Indication
(9) Acquisition Available Speed 100 kt relative
SP - 4
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Index
A
O
Acquisition............................................... 6-4
A/C RAIN................................................ 2-5
A/C SEA ................................................ 2-4
ARPA....................................................... 6-2
OTHER MENU ...................................... 3-7
Offcenter ................................................. 2-9
Offset EBL ............................................... 2-8
P
B
Presentation Mode .................................. 2-6
Preventitive Maintenance....................... 5-1
Program No............................................. 5-3
Pulsewidth............................................... 2-4
Pulselength ............................................. 2-4
Bearing.................................................... 2-7
Blind Sectors ........................................... 4-4
Brilliance........................................... 2-4, 3-8
C
R
Course Up ............................................... 2-6
CPA/TCPA alarm ..................................... 6-6
Cursor ..................................................... 2-7
Range...................................................... 2-4
Range Ring ............................................. 2-4
E
S
EBL ........................................................ 2-7
Echo Stretch............................................ 2-6
Echo Trail .............................................. 3-4
Echonomy Mode ..................................... 2-3
SART.......................................................... iii
Second-trace echoes .............................. 3-8
Self Test .................................................. 5-3
Sensitivity ................................................ 2-4
Shadow Sectors ...................................... 4-2
Side-lobe Echoes .................................. 4-1
Stand-by.................................................. 2-3
F
Function Keys ........................................ 3-8
Fuse ........................................................ 5-1
T
G
TLL .......................................................... 3-8
Trail tone ................................................. 3-4
Transmitting ............................................ 2-3
Troubleshooting .................................... 5-2
Turning On and Off.................................. 2-3
Gain......................................................... 2-4
Guard Alarm .......................................... 3-4
Guard zone ............................................. 3-4
H
V
Head Up .................................................. 2-6
Heading Marker....................................... 2-6
Vector length ........................................... 6-6
Vector mode ............................................ 6-6
VRM ........................................................ 2-7
I
Index Line................................................ 3-1
Indirect Echoes ....................................... 4-2
Interference ........................................... 3-2
W
Watcnman ............................................... 3-6
L
Z
Lost target alarm ..................................... 6-6
Zoom ....................................................... 2-9
M
Magnetron ............................................. 5-3
Multiple Echoes....................................... 4-1
MENU TREE ........................................... vii
N
Navigation Data.............................. 2-3, 3-3
Noise ....................................................... 3-8
North Marker ........................................... 2-6
North Up.................................................. 2-6
IN-1
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