Furuno 1761 MARK-3 User Manual
(
C
9-52, Ashihara-cho,
Nishinomiya, Japan
Telephone: 0798-65-2111
Telefax: 0798-65-4200
All rights reserved.
Printed in Japan
Your Local Agent/Dealer
FIRST EDITION : AUG. 1998
D : JUL. 10, 2001
PUB. No. OME-34810
YOSH)
MODEL 1761 MARK-3
SAFETY INSTRUCTIONS
DANGER
Stay away from transmitting antenna.
The radar antenna emits microwave radiation which can be harmful to the
human body, particularly the eyes. Never look directly into the antenna
radiator from a distance of less than 1 m when the radar is in operation.
Radio Frequency Radiation Hazard
The radar antenna emits electromagnetic radio frequency (RF) energy which can be
harmful, particularly to your eyes. Never look directly into the antenna aperture from a
close distance while the radar is in operation or expose yourself to the transmitting
antenna at a close distance.
Distances at which RF radiation levels of 100 and 10 W/m
below.
Note: If the antenna unit is installed at a close distance in front of the wheel house,
your administration may require halt of transmission within a certain sector of antenna
revolution. This is possible—Ask your FURUNO representative or dealer to provide
this feature.
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DANGER
WARNING
Before turning on the radar
make sure no one is near the
scanner unit.
Prevent the potential risk of
someone begin struck by the
rotating antenna and exposure
to RF radiation hazard.
WARNING
Do not open the equipment.
Improper handling can result in electrical
shock. Only qualified personnel shold
work inside the equipment.
Do not disassemble or modify the
equipment.
Fire electrical shock or serious injury can
result.
Turn off the power immediately if water
leaks into the equipment or the equipment is emitting smoke or fire.
Use the proper fuse.
Fuse rating is shown in the chapter 5.
Use of a wrong fuse can result in equipment
damage
Do not operate the equipment with wet
hands.
Electrical shock can result.
CAUTION
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.
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.
Two warning labels are attached to the display
unit and scanner unit. Do not remove these labels.
If labels are peeling off or are illegible, contact
a FURUNO agent or dealer.
<Display Unit>
Name: Warning Label (1)
Type: 86-003-1011-0
Code no.: 100-236-230
<Scanner Unit>
Name: Radiation Warning
Label
Type: 03-142-3201-0
Code no.: 100-266-890
WARNING
To avoid electrical shock, do not
remove cover. No user-serviceable
parts inside.
WARNING
Radiation hazard. Only qualified
personnel should work inside scanner.
Confirm that TX has stopped before
opening scanner.
ii
FOREWORD
Congratulations on your choice of the
FURUNO MODEL 1761 MARK-3 Marine Radar. We are confident you will see why the
FURUNO name has become synonymous
with quality and reliability.
For over 50 years FURUNO Electric Company has enjoyed an enviable reputation for
innovative and dependable marine electronics equipment. This dedication to excellence
is furthered by our extensive global network
of agents and dealers.
Your radar is designed and constructed to
meet the rigorous demands of the marine environment. However, no machine can perform its intended function unless properly
installed and maintained. Please carefully
read and follow the recommended procedures for installation, operation and maintenance.
While this unit can be installed by the purchaser, any purchaser who has doubts about
his or her technical abilities may wish to have
the unit installed by a FURUNO representative or other qualified technician. The importance of a through installation can not be
overemphasized.
Features
Your radar has a large variety of functions,
all contained in a remarkably small cabinet.
The main features of the MODEL 1761
MARK-3 are:
¡ Traditional FURUNO reliability and qual-
ity in a compact, lightweight and low-cost
radar.
¡ Durable brushless antenna motor.
¡ On-screen alphanumeric readout of all op-
erational information.
¡ Standard features include EBL (Electronic
Bearing Line), VRM (Variable Range
Marker), Guard Alarm, Display Off Center, and Echo Trail.
¡ Watchman feature periodically transmits
the radar to check for radar targets which
may be entering the alarm zone.
¡ Ship’s position in latitude and longitude,
range and bearing to a waypoint, and
ship’s speed/heading/course can be
shown in the bottom text area. (Requires
a navigation aid which can output such
data in IEC 61162 format.)
We would appreciate hearing from you, the
end-user, about whether we are achieving
our purposes.
Thank you for considering and purchasing
FURUNO equipment.
¡ Zoom feature provided.
iii
TABLE OF CONTENTS
FOREWORD.............................. iii
MENU TREE ............................... v
TABLE OF CONTENTS BY
INDICATION, MARKER............. vi
SYSTEM CONFIGURATION..... vii
1. PRINCIPLE OF OPERATION
1.1 What is Radar? .............................. 1-1
1.2 How Ships Determined Position Before
Radar ............................................. 1-1
1.3 How Radar Determines Range ...... 1-1
1.4 How Radar Determines Bearing .... 1-1
1.5 Radar Wave Speed and Antenna
Rotation Speed .............................. 1-1
1.6 The Radar Display ......................... 1-1
2.21 Adjusting Control Panel Brilliance......
..................................................... 2-8
2.22 Selecting Ranges ......................... 2-9
2.23 EBL/Cursor Bearing Reference ... 2-9
2.24 Guard Alarm................................. 2-9
2.25 Watchman .................................. 2-10
2.26 Plotting ........................................2-11
2.27 Navigation Data Display..............2-11
3. FALSE ECHOES
3.1 Multiple Echoes.............................. 3-1
3.2 Side-lobe Echoes ........................... 3-1
3.3 Indirect Echoes .............................. 3-2
3.4 Blind and Shadow Sectors............. 3-2
3.5 SART (Search and Rescue
Transponder) ................................. 3-3
4. MAINTENANCE & TROUBLESHOOTING
2. OPERATION
2.1 Control Description......................... 2-1
2.2 Turning the Radar On/Off............... 2-2
2.3 Transmitting.................................... 2-2
2.4 Stand-by......................................... 2-2
2.5 Selecting the Range....................... 2-2
2.6 Adjusting Picture Brilliance............. 2-2
2.7 Adjusting Receiver Sensitivity ........ 2-2
2.8 Adjusting the A/C SEA Control
(reducing sea clutter)..................... 2-3
2.9 Adjusting the A/C RAIN Control
(reducing rain clutter)..................... 2-4
2.10 Adjusting FTC............................... 2-4
2.11 Turning the Radar Receiver ......... 2-4
2.12 Erasing the Heading Marker ........ 2-4
2.13 Select the Cursor Data Display.... 2-5
2.14 Turning the Range Ring On/Off ... 2-5
2.15 Measuring the Range................... 2-5
2.16 Measuring the Bearing................. 2-5
2.17 Shifting and Zooming the Display ......
..................................................... 2-6
2.18 Menu Operation ........................... 2-7
2.19 Echo Stretch................................. 2-8
2.20 Suppressing Radar Interference .. 2-8
4.1 Preventive Maintenance ................ 4-1
4.2 Replacing the Fuse ........................ 4-1
4.3 Troubleshooting.............................. 4-2
4.4 Life Expectancy of Magnetron ....... 4-3
SPECIFICATIONS ................ SP-1
INDEX .....................................IN-1
iv
MENU TREE
MENU KEY
1. ECHO STRETCH (ON, OFF)
2. I. REJECT (OFF, ON)
3. PANEL DIMMER (0, 1, 2, 3, 4)
4. PLOT INTVL (CONT, 30S, 1M, 3M, 6M)
5. PLOT BRILL (LOW,
6. RANGE (NM) set with (RING)
(1/4, 1/2, 3/4, 1, 1.5, 2, 3, 4, 6, 8, 12, 16, 24, 48)
7. WATCHMAN (OFF, 5M, 10M, 20M)
8. NAV DATA (ON, OFF)
9. EBL/+CURSOR (TRUE, REL)
@
HIGH)
v
Plotting (P.2-11)
TABLE OF CONTENTS BY
INDICATION, MARKER
Elapsed time (P.2-11)
Plotting interval (P.2-11)
Tuning indicator (P.2-11)
MAG (or GYRO) BEARING (option)
Heading marker (P.2-4)
Range (P.2-2)
Range ring interval (P.2-2)
Shift (or Zoom) (P.2-6)
Watchman (P.2-10)
Guard zone (P.2-9)
Cursor (P.2-5, 6)
3.0 NM
SHIFT
12 NM
MAG 115.0
WATCHMAN
¡
PLOT 3M
18:25 ES
GUARD
*
FTC
IR
Echo stretch (P.2-8)
Guard alarm (P.3-4)
FTC (P.2-4)
Interference rejector (P.2-8)
EBL (P.2-6)
Range ring (P.2-3, 2-5)
EBL1 bearing (P.2-6)
EBL
¡
45.6 R
¡
315.1 R
9.05 NM
Cursor data(P.2-5)
Bearing /Range or
Latitude/Longitude
vi
VRM
2.62 NM
VRM range (P.2-5)
SYSTEM CONFIGURATION
Scanner Unit
XN10A-RSB-0070-065
Navigation
IEC 61162* (In/Out)
device
Gyrocompass
*Equivalent to NMEA 0183
Option
Gyro Converter
AD-100
Intergrated Heading
Sensor PG-1000
Display Unit
RDP-099
12 VDC: 10A
24/32 VDC: 5A
12/24/32 VDC
External Alarm
Buzzer OP03-21
Rectifier
RU-3423
115/230 VAC
vii
1. PRINCIPLE OF OPERATION
1.1 What is Radar?
The term “RADAR” is an acronym meaning
RAdio Detection And Ranging. Although the
basic principles of radar were developed during World War II, echoes as an aid to navigation is not a new development.
1.2 How Ships Determined Position Before Radar
Before the invention of radar, when running
in fog near a rugged shoreline, ships would
sound a short blast on their whistles, fire a
shot, or strike a bell. The time between the
origination of the sound and the returning of
the echo indicated how far the ship was from
the cliffs or the shore. The direction from
which the echo was heard indicated the relative bearing of the shore.
1.3 How Radar Determines Range
1.4 How Radar Determines Bearing
The bearing to a target found by the radar is
determined by the direction in which the radar scanner antenna is pointing when it emits
an electronic pulse and then receives a returning echo. Each time the scanner rotates
pulses are transmitted in the full 360 degree
circle, each pulse at a slightly different bearing from the previous one. Therefore, if one
knows the direction in which the signal is sent
out, one knows the direction from which the
echo must return.
1.5 Radar Wave Speed and Scanner 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 scanner. 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.
Radar determines the distance to the target
by calculating the time difference between the
transmission of a radar signal and the reception of the reflected echo. It is a known fact
that radar waves travel at a nearly constant
speed of 162,000 nautical miles per second.
Therefore the time required for a transmitted
signal to travel to the target and return as an
echo to the source is a measure of the distance to the target. Note that the echo makes
a complete round trip, but only half the time
of travel is needed to determine the one-way
distance to the target. This radar automatically takes this into account in making the
range calculation.
1.6 The Radar Display
The range and bearing of a target is displayed
on what is called a Plan Position Indicator
(PPI). This display is essentially a polar diagram, with the transmitting ship’s position at
the center. Images of target echoes are received and displayed at their relative bearings, and at their distance from the PPI center.
With a continuous display of the images of
targets, the motion of the transmitting ship is
also displayed.
1-1
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