Furuno 1832 User Manual

Back

(

9-52, Ashihara-cho, Nishinomiya, Japan

Telephone: 0798-65-2111 Telefax: 0798-65-4200

Printed in Japan

PUB. No. OME-34410

HIMA)

MODEL1832/1932/1942

Your Local Agent/Dealer

FIRST EDITION : JAN. 1997 P : OCT. 17, 2001

SAFETY INSTRUCTIONS

Use the proper fuse.

Use of a wrong fuse can result in fire or permanent equipment damage.

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

Personal injury can result if the equipment is used as a chair or stepping stool, for example.

Do not place objects on the top of the equipment.

The equipment can overheat or personal injury can result if the object falls.

CAUTION

"DANGER", "WARNING" and "CAUTION" notices appear throughout this manual. It is the responsibility of the operator and the installer of the equipment to read, understand and follow these notices. If you have any questions regarding these safety instructions, please contact a FURUNO agent or dealer.

WARNING

Do not open the equipment.

Hazardous voltage which can cause electrical shock, burn or serious injury exists inside the equipment. Only qualified personnel should work inside the equipment.

Wear a safety belt and hard hat when working on the antenna unit.

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

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.

WARNING

Do not disassemble or modify the equipment.

Fire electrical shock or serious injury can result.

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

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

Do not place liquid-filled containers on the top of the equipment.

Fire or electrical shock can result if a liquid spills into the equipment.

Turn off the radar power switch before servicing the antenna unit. Post a warning sign near the switch indicating it should not be turned on while the antenna unit is being serviced.

Prevent the potential risk of someone begin struck by the rotating antenna and exposure to RF radiation hazard.

iiiiiiiiiiiii

FOREWORD

Congratulations on your choice of the FURUNO MODEL 1832/1932/1942 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.

Y our 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.

W e would appreciate hearing from you, the enduser, about whether we are achieving our purposes.

Thank you for considering and purchasing FURUNO equipment.

Features

Your radar has a large variety of functions, all contained in a remarkably small cabinet.

The main features of the MODEL 1832/1932/ 1942 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.

¡ W atchman feature periodically transmits the

radar to check for radar targets which may be entering the alarm zone.

¡ Ship’s position in latitude and longitude and

Loran C Time Differences, 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 1162 format.)

¡ Zoom feature provided.

iii

FOREWORD...................................iii

SPECIFICATIONS ...........................v

EQUIPMENT LIST ........................viii

CONFIGURATION OF

MODEL 1832/1932/1942 .............x

1. PRINCIPLE OF OPERATION ......1

1.1 What is Radar?.................................... 1

1.2 How Ships Determined Position Before

Radar ..................................................1

1.3 How Radar Determines Range ........... 1

1.4 How Radar Determines Bearing.........1

1.5 Radar Wave Speed and Antenna Rota-

tion Speed...........................................1

1.6 The Radar Display ..............................1

2. BASIC OPERATION ....................3

2.1 Control Description ............................ 3

2.2 Display Indications and Markers ........ 4

2.3 Turning the Radar On and Off ............5

2.4 Transmitting........................................5

2.5 Stand-by..............................................5

2.6 Selecting the Range ............................ 6

2.7 Adjusting Picture Brilliance................6

2.8 Adjusting Receiver Sensitivity ...........6

2.9 Adjusting the A/C SEA Control (reduc-

ing sea clutter) .................................... 6

2.10 Adjusting the A/C RAIN Control

(reducing rain clutter).........................7

2.11 Erasing the Heading Line, North Mark

..........................................................8

2.12 Measuring the Range ........................8

2.13 Measuring the Bearing...................... 9

2.14 Using the Offset EBL ....................... 9

2.15 Shifting (off centering) the Picture . 10

2.16 Zoom............................................... 11

3. MENU OPERATION...................12

3.1 Basic Menu Operation ......................12

3.2 Selecting the Presentation Mode ...... 12

3.3 Magnifying Long Range Echoes (echo

stretch).............................................. 13

3.4 Echo Trail.......................................... 13

3.5 Suppressing Radar Interference ........ 14

3.6 Selecting Pulsewidth......................... 15

3.7 Guard Alarm .....................................15

3.8 Watchman ......................................... 16

3.9 Displaying Navigation Data ............. 17

3.10 OTHER MENU Description........... 18

3.11 Function Keys................................. 19

3.12 Suppressing Noise .......................... 19

3.13 Adjusting Brilliance of Markers .....19

3.14 Outputting Target Position.............. 19

4. FALS ECHOES ..........................20

4.1 Multiple Echoes ................................ 20

4.2 Side-lobe Echoes .............................. 20

4.3 Indirect Echoes ................................. 20

4.4 Blind and Shadow Sectors ................ 21

5. MAINTENANCE & TROUBLE-

SHOOTING ................................22

5.1 Preventitive Maintenance ................. 22

5.2 Replacing the Fuse............................ 22

5.3 Troubleshooting................................ 23

5.4 Self Test ............................................ 24

5.5 Life Expectancy of Magnetron .........24

6. INSTALLATION .........................25

6.1 Antenna Unit Installation.................. 25

6.2 Display Unit Installation...................30

6.3 Exchange of Fuse for 24/32V Power

Supply .............................................. 32

6.4 Checking the Installation ..................32

6.5 Adjustments ...................................... 32

MENU TREE ............................. AP-1

ARP-10 (OPTION) .................... AP-2

Declaration of Conformity

MODEL 1832 SPECIFICATIONS

ANTENNA UNIT

1. Radiator: Printed array

2. Radiator length: 60 cm

3. Horizontal beamwidth: 3.9°

4. Vertical beamwidth: 20°

5. Sidelobe:

Within ± 20° of mainlobe; less than -18 dB Outside ± 20° of mainlobe; less than -23 dB

6. Polarization: Horizontal

7. Antenna rotation speed: 24 rpm

8. Wind resistance: Relative wind speed 100 knots (51.5 m/s)

TRANSCEIVER MODULE (contained in radome)

1. Transmitting tube: MG5248, E3571 or

MAF1421B

2. Frequency:

9410 MHz ±30 MHz

3. Peak output power: 4 kW nominal

4. Pulselength & pulse repetition rate:

0.08 µs, 2100 Hz (0.125, 0.25, 0.5, 0.75, 1.5)

0.3 µs, 1200 Hz (1.5, 2, 3)

0.8 µs, 600Hz (3, 4, 6, 8, 12, 16, 24, 36)

5. Warmup time: 1:30

6. Modulator: FET switching

method

7. I.F.: 60 MHz

8. Tuning: 3Automatic or

manual

9. Receiver front end:

MIC (Microwave IC)

10. Bandwidth: Tx pulselength 0.3 µs and 0.08 µs: 25 MHz

Tx pulselength 0.8 µs: 3 MHz

11. Duplexer: Circulator with diode

limiter

DISPLAY UNIT

monochrome CRT

3. Range scale (nm): Range, Range interval and no. of Rings:

0.125 (0.0625, 2), 0.25 (0.125, 4), 0.75 (0.25, 3), 1 (0.25, 4), 1.5 (0.5, 3), 2 (0.5, 4), 3 (1, 3), 4 (1, 4), 6 (2, 3), 8 (2, 4), 12 (3, 4), 16 (4, 4), 24 (6, 4), 36 (12, 3)

4. Bearing resolution: 4°

5. Bearing accuracy: Within 1°

6. Range discrimination: Better than 20 m

7. Range ring accuracy:

0.9 % or range in use or 8 m, whichever is larger

8. Minimum range: Better than 25 m

9. Markers:

Heading line, Bearing scale, Range ring, VRM 1/2, EBL 1/2, Tuning indicator, Cursor, Alarm zone, North mark (heading sensor input required)

10. Alphanumeric indication:

Range, Range ring interval, Pulselength (SP, MP, LP), Display mode (HU, CU, NU, TM), Interference rejection (IR1, IR2, IR3), VRM (1,2), EBL (1, 2), Automatic A/C SEA (A/C AUTO), Stand-by (ST-BY), Radar alarm: G(IN)/G(OUT)/G(ACKN), Echo stretch (ES1, ES2), Range to cursor, Bearing to cursor, Echo trailing (TRAIL), Trail time, Trail elapsed time, Navigation data (navigation input required), heading (HDG, heading sensor input required)

11. Vibration: Vibration Total amplitude

5 to 12.5 Hz ± 1.6 mm 12 to 25 Hz ± 0.35 mm 25 to 50 Hz ± 0.10 mm

12. T emperature:

Antenna unit; -25 °C to + 70 °C Display unit; -15 °C to + 55 °C

13. Humidity:

Relative humidity 93% or less at + 40°C

14. W aterproofing: Antenna unit;

IPX6 Display unit; IPX5

15. Power supply & power consumption:

12 V, 24 V or 32 VDC (10.2 V to 41.6 VDC) 50W

16. Protection feature:

Protection against reverse polarity, overvoltage, overcurrent, and internal fault

17. Compass safe distance:

1. Indication system: PPI raster scan

2. Display: 10-inch rectangular

MODEL 1932

MODEL 1942

SPECIFICATIONS

ANTENNA UNIT

1. Radiator: Slotted waveguide array

2. Radiator length: 100 cm

3. Horizontal beamwidth: 3.9°

4. Vertical beamwidth: 27°

5. Sidelobe:

Within ± 20° of mainlobe; less than -24 dB Outside ± 20° of mainlobe; less than -30 dB

6. Polarization: Horizontal

7. Antenna rotation speed: 24 rpm

8. Wind resistance:

Relative wind speed 100 knots (51.5 m/s)

TRANSCEIVER MODULE (contained in antenna)

SPECIFICATIONS

ANTENNA UNIT

1. Radiator: Slotted waveguide array

2. Radiator length: 120 cm

3. Horizontal beamwidth: 1.9°

4. Vertical beamwidth: 22°

5. Sidelobe:

Within ± 20° of mainlobe; less than -24 dB Outside ± 20° of mainlobe; less than -30 dB

6. Polarization: Horizontal

7. Antenna rotation speed: 24 rpm

8. Wind resistance:

Relative wind speed 100 knots (51.5 m/s)

TRANSCEIVER MODULE (contained in antenna)

1. Pulselength & pulse repetition rate:

0.08 µs, 2100 Hz (0.125, 0.25, 0.5, 0.75, 1.5)

0.3 µs, 1200 Hz (1.5, 2, 3)

0.8 µs, 600Hz (3, 4, 6, 8, 12, 16, 24, 36, 48)

2. Others: See MODEL 1832.

DISPLAY UNIT

1. Range scale (nm):

Range, Range interval and no. of Rings:

0.125 (0.0625, 2), 0.25 (0.125, 4), 0.75 (0.25, 3), 1 (0.25, 4), 1.5 (0.5, 3), 2 (0.5, 4), 3 (1, 3), 4 (1, 4), 6 (2, 3), 8 (2, 4), 12 (3, 4), 16 (4, 4), 24 (6, 4), 36 (12, 3), 48 (12, 4)

2. Compass safe distance:

Standard compass Steering compass

Display unit 0.75 m 0.6 m

Antenna unit 1.1 m 0.8 m

3. Others: See MODEL 1832.

1. Transmitting tube: MG5389 or E3560

2. Peak output power: 6 kW nominal

3. Pulselength & pulse repetition rate:

0.08 µs, 2100 Hz (0.125, 0.25, 0.5, 0.75, 1.5)

0.3 µs, 1200 Hz (1.5, 2, 3)

0.8 µs, 600Hz (3, 4, 6, 8, 12, 16, 24, 36, 48, 64)

4. Bandwidth:

Tx pulselength 0.3 µs and 0.08 µs: 25 MHz Tx pulselength 0.8 µs: 5 MHz

5. Others: See MODEL 1832.

DISPLAY UNIT

1. Range scale (nm):

Range, Range interval and no. of Rings:

0.125 (0.0625, 2), 0.25 (0.125, 4), 0.75 (0.25, 3), 1 (0.25, 4), 1.5 (0.5, 3), 2 (0.5, 4), 3 (1, 3), 4 (1, 4), 6 (2, 3), 8 (2, 4), 12 (3, 4), 16 (4, 4), 24 (6, 4), 36 (12, 3), 48 (12, 4), 64 (16, 4)

2. Compass safe distance:

Standard compass Steering compass

Display unit 0.75 m 0.6 m

Antenna unit 1.0 m 0.74 m

3. Power supply & power comsumption:

12 V, 24 V or 32 VDC (10.2 V to 41.6 VDC) 52W

INTERFACE IEC 1162

ARPA FUNCTION

(NMEA0183)

(Input)

Own ship's position:

GGA>RMA>RMC>GLL

Speed:

RMA>RMC>VTG>VHW

Heading (True):

HDT>HDG*>HDM*>VHW>VHW*

Heading (Magnetic): HDM>HDG*>HDT*>VHW>VHW* Course (True): RMA>RMC>VTG Course (Magnetic):

VTG>RMA*>RMC* Waypoint (Range, Bearing): RMB>BWC>BWR Loran time difference: RMA>GLC>GTD Water depth: DPT>DBT Water temperature: MDA>MTW XTE: RMB>XTE>APB *: Calculated value based Magnetic variation.

(Output)

TLL: On using "TLL" Key. RSD: An interval of four seconds. TTM: ARP-10 (Option)

(OPTION)

1. Internal Board ARP-10

2. Acquisition Instant selection of auto or manual acquisi-

tion in 0.2 - 16 nm, relative speed 100kt.

3. Tracking Automatic tracking of up to 10 acquired

targets betwen 0.1 to 16 nm.

4. Prediction of target motion True or relative vectors, time scaled.

5. Past position 10 past positions of tracked targets.

6. Alarm Lost target. CPA/

TCPA

7. Automatic tracking range

0.1 - 16 nm

8. Target information (one target selected)

¡Distance and bearing from own ship to

target

¡Moving direction and speed ¡CPA (estimated Closest Point of Approach)

and TCPA (estimated Time to CPA)

9. Vector length 30 sec. - 30 min.

10. Plotting interval 15 sec. - 6 min.

vii

EQUIPMENT LIST

Complete Set

MODEL 1832

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1tinUannetnA750-1700-BSR1

4seirasseccA00460-30PF278-680-000tes1 5

MODEL 1932/1942

1tinUannetnA

5straPerapS00221-30PS569-680-000tes1

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)enotceles(

straPerapS00221-30PS569-680-000

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)enotceles(

seirasseccA

00961-30PC348-680-000 01961-30PC448-680-000m51.yssaelbac.gis 02961-30PC548-680-000m02.yssaelbac.gis 03961-30PC648-680-000m03.yssaelbac.gis

A450-1600-BSR12391LEDOMroF A550-2600-BSR12491LEDOMroF

811-PDR1

00071-30PC848-680-000 01071-30PC948-680-000m51.yssaelbac.gis 02071-30PC058-680-000m02.yssaelbac.gis 03071-30PC158-680-000m03.yssaelbac.gis

00460-30PF278-680-000tes1

tes1

m01.yssaelbac.gis

Optional Equipment

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1draoBPRA01-PRA258-680-0001

reifitceR26-RP484-310-000

584-310-000CAV011,2381

3243-UR344-030-0001 CA,2491/2391

3sneLgniyfingaM0051-121-30000-934-8001

4tiKtnuoMhsulF541-30PO060-674-8001

5)1(tekcarBgnitnuoM29-30PO070-544-8001 2381LEDOMroF 6rezzuBlanretxE12-30PO790-030-0001.1etoneeS*

.yssAelbaC050-3000FPS6A-JM306-711-000

001-9000FPS6A-JM632-521-000 001-7000FPS6A-JM732-521-000

Note 1) Even though the display unit meets waterproof standard IPX-5, the connection of external buzzer, radar plotter and/or remote display can affect waterproofness. Watertight integrity cannot be guaranteed. When these modification has been done, the display unit should not be mounted where exposed.

Note 2) Conversion from MCP connector (square type) to MJ connector (circular type).

001-21000FPS6A-JM718-331-000 050-21000FPS6A-JM424-431-000 500-6000FPL42B-JM834-041-000.2etoneeS*

684-310-000CAV022,2381 784-310-000CAV032,2381

CAV001,2381

viii

Installation Materials

CP03-169xx (Model 1832)

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1m01elbaClangiS001-2000FPL42B-JM279-831-000

m51elbaClangiS051-2000FPL42B-JM079-831-000 m02elbaClangiS002-2000FPL42B-JM479-831-000 m03elbaClangiS003-2000FPL42B-JM379-831-000

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CP03-170xx (Model 1932/1942)

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2elbaCrewoP2339S30829-831-0001

3rehsaWlaeSXD3501WC120-058-0004 4tloBxeH403SUS06x21M191-268-0004 5tuNxeH403SUS21M211-368-0004

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403SUS52x01M803-268-000

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m51elbaClangiS051-2000FPL42B-JM079-831-000 m02elbaClangiS002-2000FPL42B-JM479-831-000 m03elbaClangiS003-2000FPL42B-JM379-831-000

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Spare Parts (SP03-12200)

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1esuFV521CAA5A-OBGF460-945-0002

2esuFV521CAA01OBGF560-945-0002

3)A5(lebaL0-2151-921-30087-842-0011 CDV23/42roF

ylppus

Accessories (FP03-06400)

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4.yssAdooH01840-30PF004-144-8001

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CONFIGURATION OF MODEL 1832/1932/1942

Antenna Unit

NAV

Video Sounder

Gyro

*Equivalent to NMEA 0183

IEC 1162* (In/Out)

IEC 1162* (In)

Gyro Converter

AD-100

: Option : Local Supply

(1832)

Display Unit

RDP-118

Auto Plotter

ARP-10

12 VDC: 5A 24 VDC: 10A

(1932/1942)

Remote Display

FMD-811/1800

External Alarm

Buzzer OP03-21

Rectifier PR-62(1832), RU-3423(1932/1942)

12/24/32 VDC

Note: Even though the display unit meets waterproof standard IPX-5, the connection of external buzzer , radar plotter and/or remote display can affect waterproofness. W atertight integrity cannot be guaranteed. When these modification has been done, the display unit should not be mounted where exposed.

115/230 VAC

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

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.

1.4 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 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.

1.6 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 tar gets, the motion of the transmitting ship is also displayed.

Targets

Heading line

Range and bearing of a target, relative to own ship, are

readable on the PPI.

Own ship (radar)

(A) Bird's eye view of situation

Own ship in center

(B) Radar picture of (A)

Figure 1-1 How radar works

2.1 Control Description

2. BASIC OPERATION

Brief press: Displays the data of target selected with the cursor.

Long press: Terminates plotting of the target selected with the cursor.

Opens/closes menus. Selects

EBL1/EBL2/VRM1/VRM2. Control:

Adjusts sensitivity. Switch:

Temporarily erases heading line (and north mark if displayed).

Control: Reduces sea clutter.

Switch*: (Long press) Shifts your vessel’s position to cursor location. (Brief press) Doubles size of area between your vessel and location selected by cursor.

Control: Reduces rain clutter.

Switch*: Displaces the EBL origin.

SELECT

CANCEL

RANGE

EBL/VRM SELECT

GAIN

HM-OFF

A/C SEA

A/C RAIN

ACQ

ENTER

GUARD

EBL/VRM

CONTROL

TLL

A/C AUTO

BRILL

ST BY

POWER

Omnipad Shifts cursor, VRM and EBL; select items and options on menu.

(1) Acquires the target selected

with the ominipad.

(2) Registers selection on

menus.

Sets guard zone area.

Selects radar range.

Enables/erases EBL1/EBL2/EBL3/EBL4.

Outputs target position data.

Automatically reduces sea and rain clutters.

Adjusts display brilliance.

Sets radar in stand-by; transmits radar pulse.

Turns power on/off.

Lights when the economy mode is on.

*Default switch function.

Figure 2-1 Control panel

2.2 Display Indication and Markers

Heading (requires heading data)

Range (P.6) Range ring interval (P.6)

Pulselength (P.6) Display mode (P.12)

Cursor (P.8, 9)

Guard zone area (P.15)

EBL1 (P.9) VRM1 (P.8)

Echo trail elapsed time (P.13)

Heading line (P.8)

. 125NM .

0625 SP HU

HDG 234.5°

TRAIL

25 : 38

AUTO

30M

G (OUT)

ZOOM

ES1

OFFCENTER

Tuning indicator (P.6)

Echo trail time (P.13) Guard Zone (P.15) Zoom (P.11) Echo Stretch (P.13)

Off center (P.10)

EBL2 (P.9)

Range ring (P.8)

VRM2 (P.8)

North mark (P.8)

A/C AUTO (P.7)

EBL1 bearing (P.9)

EBL2 bearing (P.9)

A/C AUTO EBL

345.6 R

23.0 R

Cursor bearing (P.9)

Cursor range (P.8)

Figure 2-2 Display indications

13.5 R°

0.142NM

IR2

VRM

0.048NM

0.100NM

Interference rejector (P.14)

VRM1 range (P.8)

VRM2 range (P.8)

2.3 Turning the Radar On/Off

2.5 Stand-by

Press the [POWER] key to turn the radar on or off.

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.

2.4 Transmitting

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. In stand-by the radar is available for use at anytime - but no radar waves are being transmitted.

Press the [STBY TX] key to transmit. When transmitting, any echoes from targets

appear on the display. This radar displays echoes in eight tones of green according to echo strength.

When you won’t be using the radar for an extended period, but you want to keep it in a state of readiness, place it in stand-by by pressing the [STBY TX] key. The display shows “STBY,” navigation data, or goes into the economy mode depending on menu setting. (More on menu operation later.)

Economy mode

The CR T can be set to automatically turn itself off when in stand-by , to reduce power consumption. This feature is called the “economy mode.” Power consumption in the economy mode is 28 W. When the economy mode is on, the lamp next to the [POWER] key lights.

Navigation data display during stand-by

If a navigation aid inputs navigation data to this radar, navigation data can be displayed during stand-by. You can turn the navigation data display on/off through the menu. Figure 2-3 shows a typical navigation data display during standby.

Speed

Depth

To Waypoint bearing Heading

Time-to-go to TO Waypoint

Bearing TO Waypoint

Range to TO Waypoint

SPEED

10.5

DEPTH TEMPERATURE

Heading

1.0

XTE

125

0.5

WPT TTG 01:08

BRG RNG

LAT 30°00.00N LON 135°00.00E

HDG

092.5°

CRS 180.0°M

45.0° M

12.0NM

OWN SHIP

TD 36378.1

59096.4

XTE

R 0.3NM

TRIP

000.3 nm

+17.3

0.5

ST-BY

°C

Time-to-go to Stand-by

Trip distance since power on

Course

Ship's position in latitude and longitude and Loran TDs

Cross Track Error

XTE

Mark " " shows

direction and amount of error.

1.0

Figure 2-3 Typical navigation data display

during stand-by

Note 1: Availability of a particular display item

depends on incoming data.

2.8 Adjusting Receiver Sensitivity

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.

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 optimal detection capability in short to long ranges.

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.

To select a 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 possible collision situations.

¡ If you select a lower range while on open

water, increase the range occasionally to watch for vessels that may be heading your way.

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.

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 targets may be missed because of the poor contrast between desired echoes and the background noise on the display.

To adjust receiver sensitivity, transmit on long range, and adjust the [GAIN] control so background noise is just visible on the screen.

2.9 Adjusting the A/C SEA Control (reducing sea clutter)

Echoes from waves can be troublesome, covering the central part of the display with random signals known as “sea clutter.” The higher the waves, and the higher the scanner above the water, the further the clutter will extend. Sea clutter appears on the display as many small echoes which might affect radar performance. (See the left-hand figure in Figure 2-4.) When sea clutter masks the picture, adjust the A/C SEA control to reduce the clutter.

How the A/C SEA control works

The [A/C SEA] control reduces the amplification of echoes at short ranges (where clutter is the greatest) and progressively increases amplification as the range increases, so amplification will be normal at those ranges where there is no sea clutter.

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.

Adjusting the A/C SEA 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.

If the control is set too low , tar gets will be hidden in the clutter, while if it is set too high, both sea clutter and targets will disappear from the display. In most cases adjust the control until clutter has disappeared to leeward, but a little is still visible windward.

2.10 Adjusting the A/C RAIN Control (reducing rain clutter)

The vertical beamwidth of the antenna is designed 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 display.

1. Confirm that the sensitivity is properly adjusted, and then transmit on short range.

2. Adjust the [A/C SEA] control so small targets are distinguishable but some clutter remains on the display.

Sea clutter at

display center

A/C SEA control adjusted;

sea clutter suppressed.

Figure 2-4 How to adjust the A/C SEA control

Tip for adjusting the A/C SEA

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, making recognition of solid targets easier.

Appearance of

rain clutter

A/C RAIN control adjusted;

rain clutter suppressed.

Figure 2-5 Effect of A/C RAIN

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 properly adjusted. Always leave a little clutter visible 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.

Note: In addition to reducing clutter, the [A/C

RAIN] control can be used in fine weather to clarify the picture when navigating in confined waters. However, with the circuit activated the receiver is less sensitive. Therefore, turn off the circuit when its function is not required.

Automatic adjustments of A/C SEA and A/C RAIN

Push the [A/C AUTO] key. “A/C AUTO” appears at the bottom left-hand corner of the display when the A/C AUT O circuit is on. You can fine tune by adjusting the [A/C SEA], [A/C RAIN] and [GAIN] controls.

2.11 Erasing the Heading Line, North Mark

The heading line or north mark (available with gyrocompass connection) may occasionally mask a target. To view the target, you can temporarily erase the heading line and north mark by pressing and holding down the [GAIN (HM OFF)] control. Release the control to re-display the marks.

Heading line

North mark

Figure 2-6 Heading line and north mark

2.12 Measuring the Range

You can measure the range to a target three ways: by the range rings, by the cursor, and by the VRM (Variable Range Marker).

By range ring

EBL

345.6°R

23.0°R

VRM

5.3°NM

12.5°NM

Figure 2-7 Display bottom, showing location

of EBL and VRM readouts

2. Press the [EBL/VRM CONTROL] key to enable control of the VRM by the omnipad.

3. Operate the omnipad to place the outside edge of the VRM on the inside edge of the target.

4. Check the VRM readout at the bottom righthand corner of the display to find the range to the target.

5. To anchor the VRM, press the [EBL/VRM CONTROL] key.

To erase the VRM, press and hold down the [EBL/VRM CONTROL] key about two seconds.

Range

Range ring

interval

Target

Cursor

6.0 NM

2.0

VRM1

VRM2

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.

By cursor

Operate the omnipad to place the cursor intersection 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.

By VRM

1. Press the [EBL/VRM SELECT] key to circumscribe a VRM readout (at the bottom right-hand corner). Each press of the key selects the readout of EBL1, EBL2, VRM1 or VRM2 in that order.

VRM1 range

VRM2 range

Cursor range

4.0 NM

VRM

4.0 NM

3.0 NM

Figure 2-8 Measuring range by the cursor,

range rings and VRM

Note: Y ou can display the range readout of the VRM and cursor in nautical miles, statute miles or kilometers. For details see the next chapter.

+ 44 hidden pages

Furuno 1832 User Manual

SAFETY INSTRUCTIONS

FOREWORD

TABLE OF CONTENTS

EQUIPMENT LIST

CONFIGURATION OF MODEL 1832/1932/1942

1. PRINCIPLE OF OPERATION

1.1 What is Radar?

1.2 How Ships Determined Position Before Radar

1.3 How Radar Determines Range

1.4 How Radar Determines Bearing

1.5 Radar Wave Speed and Antenna Rotation Speed

1.6 The Radar Display

2.1 Control Description

2. BASIC OPERATION

2.2 Display Indication and Markers

2.3 Turning the Radar On/Off

2.5 Stand-by

2.4 Transmitting

2.8 Adjusting Receiver Sensitivity

2.6 Selecting the Range

2.9 Adjusting the A/C SEA Control (reducing sea clutter)

2.7 Adjusting Picture Brilliance

2.10 Adjusting the A/C RAIN Control (reducing rain clutter)

2.11 Erasing the Heading Line, North Mark

2.12 Measuring the Range