Furuno GR-80 User Manual
DGPS BEACON RECEIVER
MODEL
GR-80
A
(
C
9-52, Ashihara-cho,
Nishinomiya, Japan
Telephone: 0798-65-2111
Telefax: 0798-65-4200
ll rights reserved.
Printed in Japan
Your Local Agent/Dealer
FIRST EDITION : APR. 1997
H : MAR. 13, 2001
PUB. No. OME-43830
GR-80
YOSH)
SAFETY INSTRUCTIONS
WARNING
Do not open the equipment.
Hazardous voltage which can
cause electrical shock, burn or
serious injury exists inside the
equipment. Do not work inside
the equipment unless familiar
with electrical circuits.
CAUTION
Position should always be checked
against other sources to confirm
reliability.
GPS position and velocity accuracies are
controlled by the U.S. Department of
Defense.
Turn off the equipment whenever you
feel it is abnormal.
Continued use may damage the equipment.
The useable temperature range of the
display unit is -15°C to +55°C.
Use in temperature out of the above range
may damage the equipment.
Confirm that the power supply voltage
is compatible with the voltage rating
of the equipment.
Connection to the wrong power supply
can cause fire or equipment damage. The
voltage rating appears on the label at the
rear of the display unit.
Keep the compass safe distance.
Standard compass
0.3 m 0.2 m
Steering compass
TABLE OF CONTENTS
FOREWORD............................................. 1
A Word to GR-80 Owners....................... 1
Features ................................................... 1
SPECIFICATIONS .................................... 2
SYSTEM CONFIGURATION .................. 3
HOW DGPS WORKS ............................... 4
INSTALLATION....................................... 5
Antenna Installation ................................ 5
Receiver Installation ............................... 6
Connections............................................. 6
Interface Format...................................... 7
Initial Settings ......................................... 8
OPERATION ............................................. 9
Turning the Power On/Off ......................9
Controls and Indications .........................9
Menu Operation .................................... 10
Adjusting Brilliance, Contrast ...............11
Manual Operation ..................................11
Automatic Operation..............................11
Displaying Position............................... 12
Station Scan Time Out .......................... 12
Displaying Signal Strength and
Signal-to-Noise Ratio............................ 12
Remote Control..................................... 12
TROUBLESHOOTING .......................... 13
Troubleshooting Table .......................... 13
Diagnostic T est...................................... 14
DGPS REFERENCE STATIONS............ 15
EQUIPMENT LISTS............................... 21
CONNECTABLE FURUNO
EQUIPMENT .......................................... 22
REMEDY FOR THE INTERFERENCE
TO A VHF RADIOTELEPHONE ........... 23
OUTLINE DRAWING .......................... D-1
INTERCONNECTION DIAGRAM ......S-1
SCHEMATIC DIAGRAM ..................... S-2
Declaration of Conformity
FOREWORD
A Word to GR-80 Owners
FURUNO Electric Company thanks you for
purchasing the GR-80 DGPS Beacon Receiver. We are confident you will discover
why the FURUNO name has become synonymous with quality and reliability.
For over 50 years FURUNO Electric Company has enjoyed an enviable reputation for
quality and reliability throughout the world.
This dedication to excellence is furthered by
our extensive global network of agents and
dealers.
Y our DGPS beacon receiver 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 installation, operation and troubleshooting procedures set forth in this manual.
W e would appreciate feedback from you, the
end-user, about whether we are achieving
our purposes.
Thank you for considering and purchasing
FURUNO.
Features
The GR-80 receives differential error correction messages (RTCM SC104 format)
which are broadcast by public radio beacons
operating in the 283.5 to 325 kHz frequency
range. The differential error correction messages are output via a serial port for use in
the associated GPS receiver, resulting in differentially correction position data with better than 10 meter accuracy.
The GR-80 may be controlled from the front
panel, or remotely via the serial I/O port.
The I/O protocol is NMEA 0183. Output
format is RS-232C or RS-422 (default).
1
SPECIFICATIONS
Performance
Frequency range 283.5 – 325.0 kHz
Freq. resolution 0.5 kHz
Receiver Single superhetero-
dyne
IF frequency 455 kHz
Input sensitivity 6 dBµV (MSK rate
100 bps, 10
-3
bit error)
Data Processing
Modulation MSK
Data coding Dual Costas loop
MSK rate 25, 50, 100, 200 bps
(auto or manual,
selectable)
Beacon Antenna (std. supply)
Gain 6 dB
Protection Can withstand 30
Vrms input for more
than 15 minutes in the
range of 100 kHz to
28 MHz
Interface (protocol)
Interface (position input)
Position input NMEA 0183
Hardware spec. Current loop
Baud rate 4800 bps (fixed)
Power Requirements
Power Forward switching
(floating)
Input voltage 10.2 to 31.2 VDC
Power consumptionLess than 5 W
Mechanical
Dimensions (mm) 105(W) x 60(H) x
200(D)
Mass 1 kg
Color 2.5GY5/1.5 (Gray)
Environmental Conditions
Display unit -15°C to +55°C
Antenna unit -20°C to +70°C
Humidity Receiver: 95% (40°C)
Antenna:
Water resistance Receiver: IPX-2
Antenna: IPX-6
100% (40°C)
Data protocol RTCM SC104
Status protocol NMEA 0183
Control protocol NMEA 0183
Level RS-422 or RS-232C
(selectable)
Baud rate 300, 600, 1200, 2400,
4800, 9600, 14400,
19200 bps (selectable)
2
SYSTEM CONFIGURATION
FURUNO
DGPS BEACON RECEIVER GR-80
MENU
FREQ
STN
▼
▲
ENT
RESET
LOCK
RECTIFIER
PR-62
Ship's Mains
12/24 VDC
100/110/200/220 VAC
GPS Navigator
(GPS Plotter)
RECEIVER
ANTENNA
COUPLER
GPS Antenna Unit
Whip Antenna
3
HOW DGPS WORKS
Position accuracy for civil users of GPS is
limited to about 50 meters. This limitation
exists not only because of the US Department of Defense's intentional downgrading
of the accuracy but also because of signal
attenuation and clock error inherent in both
GPS satellites and GPS receivers. With Differential GPS (DGPS), however, differential corrections can improve position
accuracy to better than 10 meters.
Differential GPS is based upon accurate
knowledge of the accurate geographical location of a reference station which is used
to compute corrections to GPS parameters,
error sources and resultant positions. These
differential corrections are transmitted to
GPS users, who apply the corrections to their
received GPS signals or computed position.
The DGPS reference stations are fixed at a
geodetically surveyed position. The reference station tracks all satellites in view,
downloads ephemeric data from them, and
computes corrections based on its measurement and geodetic position. These corrections are then broadcast to GPS users by
radio beacons (transmitters) to improve their
position solution.
The radio beacons broadcast in the frequency range of 283.5–325 kHz and have a
transmitting range from 40 nm to 300 nm
depending on radio beacon.
Reference
station
GPS signal
Radio beacon
(transmitter)
GPS satellite
Corrected data
GPS
receiver
DGPS Beacon receiver
(GR-80)
Figure 1 DGPS concept
4
INSTALLATION
Ground the equipment to
prevent loss of sensitivity.
CAUTION
GR-80
*Cable Assy.
RG-10UY
*: Antenna Cable Set parts
*N-P-7
*TNC-SA-JJ
*Cable Assy.
Antenna Installation
Siting considerations
• Install the antenna vertically and as high
and far away from surrounding obstacles
as possible.
• Separate the antenna at least three meters
from any transmitter antennas which are
radiating at significant RF power levels.
Mounting the antenna coupler
It can be mounted two ways:
• The threaded antenna base accepts a standard antenna mount with a 1"-14 straight
thread. Mount the antenna on a length of
pipe with a 1"-14 threaded end. DO NOT
USE TOOLS TO FASTEN THE ANTENNA TO ITS MOUNTING; ONLY
HAND TIGHTEN. Route the antenna
cable (antenna extension cable) inside the
pipe.
• Attach the antenna coupler to a steel mast
with hose clamps (option).
Spring
washer
Whip
antenna
Ground
If the preamp unit is attached to a steel mast,
run a ground wire between the ground terminal on the preamp unit and a stainless steel
bolt welded to the mast. The ground wire
should be as short as possible. (It is also recommended to ground the preamp unit when
it is attached to a non-metallic mast.)
Connection of antenna cable
The antenna cable (15 m) is attached to the
preamp unit. When optional 30 m or 60 m
cable is used, tape the junction with selfvulcanizing tape and vinyl tape to waterproof the cable. Finally , attach cable tie near
ends of tape to prevent unwinding.
Figure 2 Attachment of antenna coupler
Mounting of whip antenna
Screw in the whip antenna in the hole at the
top of the preamp unit. Coat junction with
silicone rubber.
Hose
clamps
Steel mast
Ground
terminal
to steel mast
Figure 3 How to tape the antenna cable
Connection of RG-10UY cable
Use the Antenna Cable Set (option) to connect the RG-10UY cable.
5
Receiver Unit Installation
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050-3000FPS6A-JM306-711-000m5,P6
050-3000FPS7A-JM037-631-000m5,P7
Connections
Siting considerations
The receiver can be mounted on a tabletop,
on the overhead or in a panel (requires optional flush mount kit). When selecting a
mounting location keep the following points
in mind;
• Locate the receiver away from rain and
water splash.
• Keep the receiver away from heat
sources.
• Install the receiver out of direct sunlight.
• The viewing angle of the front panel is
±45°.
• Leave at least 100 mm space behind the
receiver and 80 mm space at the sides to
permit easy access to connectors at the
rear and knobs at the sides.
Tabletop or overhead mounting
1. Fix the hanger to the mounting location
with tapping screws.
2. Loosely screw knobs into the receiver.
Set the receiver to the hanger and tighten
knobs.
Power cable
connector
I/O cable
connector
2A POWER DATA ANT
Fuse
(2A)
+-
10.2-31.2 VDC
Ground terminal
Antenna ca
connector
Figure 5 Connections on rear
panel of receiver
Power cable
A power cable, complete with connector, is
supplied. Connect the leads to the power
supply; red wire to positive (+) terminal and
black wire to negative (–) terminal.
The receiver does not have a power switch.
We recommend that a switch be dedicated
to the receiver on the mains switchboard.
Antenna cable
Flush mounting (option)
See outline draing at the end of the manual.
Note: Remove gasket at right and left sides
of receiver before mounting in panel.
FURUNO DGPS BEACON
Gasket
(both sides)
Figure 4 GR-80 receiver unit
Note: For flush mounting, use only the
screws supplied with the flush mount kit to
fix the receiver. Use of other screws may
damage the equipment.
Connect the cable to the ANT connector.
I/O input cable
The 7-pin DATA connector connects the
GPS navigator. A signal cable is supplied
with the navigator; attach the connector
(FM14-7P) supplied with the GR-80 to the
cable. For no signal cable the following
cables are optionally available:
Note: If the GR-80 is causing interference
to a VHF radiotelephone, follow the proce
dure on page 23.
6
Pin arrangement on the DAT A connector is
shown below. For connection at the GPS
navigator, see its manual.
For RS-232C
Pin# Signal Description
1 TXD Output data
Ground
Connect a ground wire between the ground
terminal at the rear of the receiver and a suitable ground point.
Interface Format
2 NC No connection
3 RXD Input data
4 NC No connection
5 RX-H
6 RX-C
7 FG Ground
* For auto L/L mode. See page 11.
* Nav Data
(current loop)
* Nav Data
(current loop)
For RS-422
Pin# Signal Description
1 TXD(+) Output data (H)
2 TXD(-) Output data (C)
The interface format can be RS-232C or RS422 and the default format is RS-422. For
RS-232C, do the following:
1. Disconnect cables at the rear of the receiver.
2. Unscrews eight screws to remove the receiver.
3. Disconnect cables connected to the front
panel.
4. Remove printed circuit board from rear
of the receiver .
5. On the MAIN Board (08P3192), unplug
the connector plugged into J3 (RS-422)
and plug it into J4 (RS-232C).
08P3192
3 RXD(+) Input data (H)
4 RXD(-) Input data (C)
5 RX-H
6 RX-C
7 FG Ground
* For auto L/L mode. See page 11.
* Nav Data
(current loop)
* Nav Data
(current loop)
J3
J4
RS-232C RS-422
Figure 6 MAIN Board
6. Reassemble the receiver.
7
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