9-52, ashihara-cho, - furuno usa · c 9-52, ashihara-cho, nishinomiya, japan telephone:...

C

9 - 5 2 , A s h i h a r a - c h o , N i s h i n o m i y a , J a p a n

T e l e p h o n e : 0 7 9 8 - 6 5 - 2 1 1 1 T e l e f a x : 0 7 9 8 - 6 5 - 4 2 0 0

Y o u r L o c a l A g e n t / D e a l e r

A l l r i g h t s r e s e r v e d .

P U B . N o . I M E - 3 4 8 1 0 - C M O D E L 1 7 6 1 M A R K - 3 ( Y O S H )

F I R S T E D I T I O N : A U G . 1 9 9 8 C : S E P . 4 , 2 0 0 1 Printed in Japan

i

SAFETY INSTRUCTIONS

WARNINGRadio Frequency Radiation Hazard

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

Distances at which RF radiation levels of 100 and 10 W/m2 exist are given in the tablebelow.

Note: If the scanner 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 scannerrevolution. This is possible Ask your FURUNO representative or dealer to providethis feature.

MODEL Radiatortype

Distance to 100 W/m

point

Distance to 10 W/mpoint

2 2

1761 MK-3 XN10A 0.2 m Worst case 3.0 m

ii

CAUTION

Observe the following compass safedistances to prevent deviation of amagnetic compass:

Ground the equipment toprevent electrical shock andmutual interference.

Displayunit

Standard Steeringcompass compas

0.50 m 0.40 m

Scannerunit

1.00 m 0.80 m

Jß

DANGERElectrical shock hazard.Do not touch parts in -side this cover.

Name: Danger Label Type: 14-055-4202-0Code No.: 100-245-220

HIGH TENSION WARNING

Do not open the equipmentunless totally familiar withelectrical circuits andservice manual.

Only qualified personnel should work inside the equipment.

Wear a safety belt and hardhat when working on thescanner unit.

Serious injury or death canresult if someone falls fromthe radar scanner mast.

WARNING

Construct a suitable service platformfrom which to install the scanner unit.

Serious injury or death can result if some-one falls from the radar scanner mast.

Turn off the power at the mains switch-board before beginning the installation.

Fire, electrical shock or serious injury canresult if the power is left on or is appliedwhile the equipment is being installed.

Do not install the display unit where itmay get wet from rain or water splash.

Water in the display unit can result in fire,electrical shock or equipment damage.

ELECTRICALSHOCK

HAZARD

WARNINGBe sure that the power supply iscompatible with the voltage rating ofthe equipment.

Connection of an incorrect power supplycan cause fire or equipment damage. Thevoltage rating of the equipment appearson the label above the power connector.

Use only the specified power cable.

Fire or equipment damage can result if adifferent cable is used.

iii

TABLE OF CONTENTS

SYSTEM CONFIGURATION ............................................................. iv

EQUIPMENTS LIST ............................................................................ v

1. MOUNTING1.1 Mounting Methods for Scanner Unit ..................................................................1-11.2 Fixing Holes in Mounting Platform ....................................................................1-11.3 Fastning the Radiator to the Radiator Bracket ..................................................1-21.4 Mounting the Scanner Unit ................................................................................1-21.5 Display Unit Installation .....................................................................................1-4

2. CONNECTIONS2.1 Connecting the Signal Cable .............................................................................2-12.2 Display Unit Connections ..................................................................................2-22.3 Connection of External Equipment ....................................................................2-32.4 Fuse Exchange for 24/32 VDC Power cable .....................................................2-42.5 Checking the Installation ...................................................................................2-4

3. ADJUSTMENTS3.1 Preparation........................................................................................................3-13.2 Sweep Timing ....................................................................................................3-13.3 Relative Bearing Alignment ...............................................................................3-23.4 MAG or GYRO Indication ..................................................................................3-33.5 Range Unit Selection ........................................................................................3-33.6 Measurement of Blind Shadow Sectors ............................................................3-3

INSTALLATION MATERIALS, ACCESORIES, SPARE PARTS ..... A-1

OUTLINE DRAWING ...................................................................... D-1

SCHEMATIC DIAGRAM ................................................................. S-1

iv

SYSTEM CONFIGURATION

*Equivalent to NMEA 0183

Option

RDP-099

Navigationdevice

IEC 61162* (In/Out)

Gyro-compass

Gyro ConverterAD-100

12/24/32 VDC

RectifierRU-3423

115/230 VAC

External AlarmBuzzer OP03-21

Scanner Unit

XN10A-RSB-0070-065

Display Unit

12 VDC: 10A24/32 VDC: 5A

Intergrated Heading Sensor PG-1000

v

EQUIPMENT LISTS

Standard Supply

Optional Supply

emaN epyT .oNedoC ytQ skrameR

tinUrennacS 560-0700-BSR-A01NX — 1

tinUyalpsiD 3M160-990-PDR — 1

noitallatsnIslairetaM

00291-30PC 129-680-000

tceleSeno

,10291-30PC,10021-30PClangism01,elbacrewop

elbac

01291-30PC 229-680-000,10291-30PC,10021-30PC

langism51,elbacrewopelbac

02291-30PC 329-680-000,10291-30PC,10021-30PC


03291-30PC 429-680-000,10291-30PC,10021-30PC


seirosseccA 00060-30PF 251-580-000 tes1,20640-30PF,10640-30PF

01060-30PF

straPerapS 00850-30PS 329-080-000 tes1

emaN epyT .oNedoC skrameR

rezzuBlanretxE 12-30PO 790-030-000

reifitceR 3243-UR 344-030-000

.yssAelbaC

050-2100FPS6A-JM 424-431-000m5,rednuosoediv,diavanroF,sdnehtobtarotcennocP6/w

ssorc

001-2100FPS6A-JM 718-331-000m01,rednuosoediv,diavanroF

,sdnehtobtarotcennocP6/wssorc

001-9000FPS6A-JM 632-521-000P6/wm01,001-DAroF

edisenotarotcennoc

tiKtnuoMhsulF 770-30PO 001-634-800 tinuyalpsidroF

revoCtsuD 1040-820-30 000-780-001 tinuyalpsidroF

1-1

1. MOUNTING

1.1 Mounting Methods for Scanner Unit

• The scanner unit is generally installed ei-ther on top of the wheelhouse or on theradar mast on a suitable platform. Locatethe scanner unit where there is a good all-round view. Any obstruction will causeshadow and blind sectors. A mast for in-stance, with a diameter considerably lessthan the width of the radiator, will causeonly a small blind sector, but a horizontalspreader or crosstrees in the same hori-zontal plane as the scanner unit would bea much more serious obstruction; youwould need to place the scanner unit wellabove or below it.

• It is rarely possible to place the scannerunit where a completely clear view in alldirections is available. Thus, you shoulddetermine the angular width and relativebearing of any shadow sectors for their in-fluence on the radar at the first opportu-nity after fitting.

• If you have a radio direction finder on yourboat, locate its antenna clear of the scan-ner unit to prevent interference to the di-rection finder. A separation of more thantwo meters is recommended.

• To lessen the chance of picking up elec-trical interference, avoid where possiblerouting the signal cable near other onboardelectrical equipment. Also avoid runningthe cable in parallel with power cables.

• A magnetic compass will be affected ifplaced too close to the scanner unit. Ob-serve the following compass safe dis-tances to prevent deviation of a magneticcompass: Standard compass, 1.00 m,Steering compass, 0.75 m.

• Do not paint the radiator aperture, to en-sure proper emission of the radar waves.

• When this radar is to be installed on largervessels, consider the following points:

• The signal cable run between the scan-ner and the display comes in lengthsof 10 m (standard), 15 m, 20 m and 30m. Whatever length is used it must beunbroken; namely, no splicing allowed.

• Deposits and fumes from a funnel orother exhaust vent can adversely affectthe aerial performance and hot gasesmay distort the radiator portion. Thescanner unit must not be mountedwhere the temperature is more than70°C.

As shown in the figure below, the scannerunit may be installed on the bridge, on a com-mon mast or on the radar mast.

(a) On bridgh (b) Common mast

(c) Radar mast

Figure 1-1 Scanner unit mounting methods

1.2 Fixing Holes in Mounting Platform

Referring to the outline drawing on page D-1, drill five holes in the mounting platform:four holes of 15 mm diameter for fixing thescanner unit and one hole of 25-30 mm di-ameter for the signal cable.

1-2

1.3 Fastening the Radiator to the Radiator Bracket

For your reference, scanner installation ma-terials list appears in the packing lists at theback of this manual.

1. Remove the radiator cap from the radia-tor bracket.

2. Coat contacting surface between scan-ner radiator and radiator bracket with an-ticorrosive sealant as shown in Figure 1-2.

Coat hatched area withanticorrosive sealant. Groove

Radiator

Figure 1-2 Coating the bottom ofscanner radiator for XN10A with

anticorrosive sealant

3. Coat threaded holes on the scanner ra-diator with anticorrosive sealant.

4. Grease the O-ring and set it to the radia-tor bracket.

5. Lay the scanner radiator on the radiatorbracket.

6. Coat the radiator fixing bolts (4 pcs.) withanticorrosive sealant. Fasten the scannerradiator to the radiator bracket with theradiator fixing bolts, flat washers andspring washers.

Flat washerSpring washerHex head bolt(M8 x 30)

Radiator bracket

Coat bolts withanticorrosivesealant.

Scannerradiator

O-ring

Coat threadedholes with anti-corrosivesealant.

Figure 1-3 Fastening the radiator bracket tothe scanner unit chassis

1.4 Mounting the Scanner Unit

The scanner unit can be mounted using thefixing holes on the outside (200 x 200 mm)or inside (140 x 150 mm) the scanner unit.

Outside fixing holes

Use the hex head bolt ( supplied ) to mountthe scanner unit as below.

1. Lay the corrosion-proof rubber mat (sup-plied) on the mounting platform.

Groundterminal

Rubbermat

Bow mark

Figure 1-4 Location of rubber mat

1-3

2. Lay the scanner unit on the mounting plat-form, orienting it as shown in Figure 1-5.

STERN

BOW

Figure 1-5 Scanner unit

CAUTIONCAUTIONDo not lift the scanner unit by the radiator; lift it by the housing.

The radiator may be damaged.

3. Insert four hex bolts and seal washersfrom the top of the scanner housing. In-sert the seal washers with the larger di-ameter next to the bolt heads. Be surethe seal washer, not other washers, is nextto bolt head.

Hex bolt

Seal washer

Flat washerSpring washer

Nut

Figure 1-6 Fixing the scanner unit chassis

4. Pass flat washers, spring washers andnuts onto hex bolts. Fasten by tighteningnuts. Do not fasten by tightening the hexbolts; seal washers may be damaged.

ScannerunitMountingplatform

Siliconesealant

Flat washer

Rubber mat

Seal washer

Figure 1-7 How to fasten scanner unit tomounting platform

5. Coat flat washers, spring washers, nutsand exposed parts of bolts with anticor-rosive sealant.

6. Prepare ground point in mounting platform(within 300 mm of ground terminal onscanner unit) using M6 x 25 bolt, nut andflat washer.

7. Run the ground wire (RW-4747, 370 mm)between the ground terminal and groundpoint.

8. Coat ground terminal and ground pointwith silicone sealant as shown in Figure1-9.

Groundterminal

Hex boltFlat washer

Spring washerFlat washer

Hex nutSiliconesealant

Hex nut

Weld here.

Siliconesealant

Groundwire

Scannerunit

OR

Flat washerSpring washer

Groundwire

GROUNDTERMINAL

GROUNDPOINT

Hex nut

Figure 1-8 How to coat ground point andground terminal with silicone sealant

1-4

Fixing holes inside szcanner unit

This method requires removal of the RF unitin the scanner unit to access inside fixingholes. Use hex head bolts, flat washers,spring washers and nuts (local supply) tomount the scanner unit, confirming lengh ofbolts.

1. Loose four scanner bolts to open the scan-ner unit. Refer to Figure 11 for location.

RFunit

Hex head boltM10X20 SUS 4pcs.

Hex head boltM8X25 SUS 2pcs.

Spring WasherM10 SUS4 pcs.

Cover

Pan head screwM3X8 4pcs.

Upper chassis

Square bushing

Lower chassis

Figure 10 Scanner unit chassis, upperchassis separated

2. Unplug connector connected between up-per and lower chassis.

3. Separate upper chassis from lower chas-sis by removing two hex head bolts.

4. Remove cover by unfastening four panhead screws.

5. Remove connector from RF unit .

6. Remove RF unit by unfastening four hexhead bolts.

7. Lay the corrosion-proof rubber mat (sup-plied) on the mounting platform.

8. Fasten the lower chassis to the mountingplatform with hex head bolts, springwashers, flat washers and nuts (local sup-ply ), and then coat flat washers, nuts andexposed parts of bolts with anticorrosivesealant. Cut a slit in rubber bushing andinsert bolt into bushing. Do not use sealwashers.

9. Reassemble RF unit, cover and upper chassis.

10. Set four knob caps (supplied) into outside fixing holes.

11. Do steps 6-8 in “Outside fixing holes”.

1.5 Display Unit Installation

Mounting consideration

When selecting a mounting location for thedisplay unit keep in mind the following points.

• Even though the display unit is waterploof,it is recommended that the display unitmust be mounted inside an enclosed cabi-net.

• Provide adequate space behind andaround the unit to permit circulation of airand to provide convenient access to therear connectors.

• Locate the display unit in a position whereyou can view and operate it convenientlybut where there is no danger of salt orfresh water spray or immersion.

• The orientation of the display unit shouldbe so the radar screen is viewed whilethe operatior is facing in the direction ofthe bow. This makes determination of yourposition much easier.

• Make sure you allow enough clearanceboth to get to the connectors behind theunit and to allow you to get your hands inon both sides to loosen or tighten the knobbolts. Make sure you leave at least a footor so of “service loop” of cables behindthe unit so it can be pulled forward forservicing or easy removal of the connec-tors.

• The compass safe distance of 0.5 meters(standard compass) and 0.4 meters(steering compass) should be observedto prevent deviation of the magnetic com-pass.

1-5

Mounting

The display unit is mounted in a hanger. Themount itself can be installed either overhead,on a bulkhead, or on a tabletop. The drawingbelow gives the recommended clearancesand mounting dimensions for this unit. Youcan use the mount itself as a template forlocating the mounting screw holes. Althoughthe unit is lightweight (4.8 kilograms), rein-force the mounting place, if necessary.

1. Mark the screw locations by using thehanger as a template.

2. Drill five pilot holes for the hanger.

3. Install the hanger using the screws sup-plied as the installation materials.

4. Fit the knob bolts and washers to the dis-play unit.

5. Install the display unit in the hanger.Tighten the knob bolts securely.

300 mm(11.79'') 223 mm

(8.78'')WASHER

KNOBBOLT

232 mm(9.13'')

276 mm(10.87'')

224 mm(8.82'')

196 mm(7.72'')

80 mm(3.15'') 80 mm

(3.15'')

70 mm(2.76'')

160 mm(6.30'')

80 mm(3.15'')

5-7.5MOUNTING HOLES

Figure 1-9 Display unit, outline drawing

1-6

Figure 1-10 Cutting Size for Flush mount

Installation of rubber vibrationisolators

The rubber vibration isorators stabilize thedisplay unit against ship’s vibration. Attachthem to the mounting bracket if necessaryas follows.

Rubber Vibration Isolator (supplied with bracket)03-112-1402

Align edges of isolator with notches and press in place.

Figure 1-11 Rubber Vibration Isorator

2-1

2.1 Connecting the Signal Cable

Only the signal cable runs from the displayunit to the scanner unit. In order to minimizethe chance of picking up electrical interfer-ence, avoid where possible routing the sig-nal cable near other onboard electricalequipment. Also, avoid running the cable inparallel with power cables. Pass the cablethrough the hole and apply sealing compoundaround the hole for waterproofing.

1. Open the scanner cover by loosening twoscrews, and then fix the stay.

Stay

Cable gland

Fixing screw

Figure 2-1 Scanner unit chassis,cover opened

2. Unfasten the cable gland assembly (plate,gasket, flat washer).

3. Pass the signal cable w/connectorthrough the bottom of the scanner unitchassis. Pass the cable through the glandassembly as shown below.

Plate

Bolt

4-M4×16

Gasket

Flatwasher

Figure 2-2 Passing the signal cable throughthe cable gland assembly

4. Fasten the crimp-on lug on the shield toone of the fixing bolts of the cable glandassembly.

5. Position the signal cable so that no morethan 4 cm of the sheath is exposed asshown in the figure below. Tighten fixingbolts on the cable gland assembly.

Sheath

CABLE GLAND

Plate

GasketFlatwasher

BoltWithin 4 cm

Tubing

Shield

Figure 2-3 How to fix signalcable in cable gland

2. CONNECTIONS

2-2

6. Unfasten four screws shown in the figurebelow.

Jß

Four screws


7. Pass the signal cable through the cableprotector.

Cableprotector


8. Connect the signal cable to the RTBBoard (03P9249), referring to the inter-connection diagram and the figure below.Note that connector VH2P is not used.

Route cable along here.

Lead incable here.

J821 VH9P

J824 NH13P

J823 VH4P

Clamp


9. Fix the signal cable with the cable clamp.

10.Release the stay and close the cover.Loosely fasten the cover fixing screws;you will have to make some adjustmentsinside after completion of wiring.

2.2 Display Unit Connections

unfasten to open

Socket Cap

BlackWhite

unfasten to open

Nav. Receiver NMEA0183 connectorGyro Connector Earth terminal

unfasten to open

(30m max.)

Scanner Unit

unfasten to openFuse 10A (12V)

5A (24/32V)

Figure 2-7 Display unit, wiring diagram

2-3

Power connection

This radar is designed for 12, 24 or 32 voltbattery systems. No internal wiring changesare needed for input voltage from 10.2 to 40.0VDC. A piece of gear of this quality deservesto have a circuit brealer dedicated to it alone.

The power cable is fitted with a connector atone end. Pass the other end of the cablethrough the rubber socket cap (supplied) forwaterploofing. Connect the cable to the dis-play unit, then cover the connector with thesocket cap.

Signal connection

Connect the interconnection (multicore) cablefrom the scanner unit at the back of the dis-play unit.

Ground connection

Run heavy duty ground wire from the groundterminal at the rear panel of the display unitto the nearest grounding point on the boat.Consult with a qualified e;ectrician if you areuncertain of where the proper groundingpoints on your vessel are.

2.3 Connection of ExternalEquipment

Gyrocompass (or heading sensor)connction

If an AC syncro or DC step type gyrocom-pass is installed on your boat, the true bear-ing of your ship's heading, of the cursor, andof the EBL (Electronic Bearing Line) may bedisplayed on the display.

You will need the following cable and A-Dconverter AD-100 (both optionally supplied)to make the connection.

AD-100option

To "GYRO" connectoron the rear panel

Cable Assy22S0269-010 m, option

Suppliedwith AD-100

Solderin the field.

#1: DATA-H (WHT)#2: DATA-C (BLK)#3: CLK-H (YEL)#4: CLK-C (GRN)

Figure 2-8 Gyro connection

Follow the steps below to connect the gyro-compass.

1. Remove the connector cap from the“GYRO” connection location on the rearpanel.

2. Solder the end of the Cable Assy to thecable supplied with the A-D Converter.

3. Connect the other end of the Cable Assyto the connector exposed in step 1.

4. Press and hold the [MENU] key for tenseconds to display the INSTALLATIONmenu. Select “3. MAG/GYRO” by thetrackball. Then, select “GYRO” with the[RANGE] key.

5. Presst the [MENU] key again and the in-dication “GYRO” appears at the top of thescreen.

The heading sensor (FLUX-50, C-2000) hav-ing AD-10s format or NMEA0183 output dataformat can be connected instead of a gyro-compass. In this case, you should select“MAG” instead of “GYRO” on the INSTAL-LATION menu.

When heading data of NMEA0183 format isused, connect the signal to “GYRO” connec-tor J353#1 (DATA-H) and #2 (DATA-C). Theacceptable data (talker/sentence) are **HDM,**HDG and **HDT.

2-4

Navigation aid connection

If your navigation aid has NMEA0183 orFURUNO CIF data format, your own ship'sposition in latitude/longitude, the range/bear-ing to waypoint, ship's speed, heading andcourse may be input to this radar, and be seenin the bottom text area.

You will need the following cable (optionallysupplied) to make the connection.

Type

MJ-A6SPF0012-050MJ-A6SPF0012-100

Code no.

000-134-424000-133-817

Remarks

5 m10 m

Twisted pair cable

6-pin MJ 6-pin MJ

Figure 2-9 Navigation aid connection

2.4 Fuse Exchange for 24/32VDC Power Cable

The display unit is supplied with a 10A fuse(F1351) fitted in the fuse holder on the rearpanel. This fuse is for use with 12 VDC powersupply. For 24VDC or 32 VDC power sup-plies, please exchange the fuse with the 5Afuse supplied.

CAUTIONUse the proper fuse.

Use of an improper fuse can damage the equipment and void the warranty.

2.5 Checking the Installation

After completing the installation, it is a goodidea to recheck it to be sure all steps werecorrectly done. Use the table below to checkthe installation.

• The signal cable is securely retainedagainst the mast or mounting platform andis free of interference from running rig-ging.

• The cable gland or entry on the deck, ifprovided, is waterproof.

• The power connections to the battery areof correct polarity.

• The plugs at the rear of the display unitare tightly fastened.

• The fuse F1351 on the rear panel is 10A(12V) or 5A (24V/32VDC).

3-1

3. ADJUSTMENTS

3.2 Sweep Timing

This adjustment ensures proper radar per-formance, especially on short ranges. Theradar measures the time required for a trans-mitted echo to travel to the target and returnto the source. The received echo appears onthe CRT based on this time. Thus, at the in-stant the transmitter is fired, the “Sweepshould start from the center of the CRT(sometimes called sweep origin.)

A “trigger” pulse generated in the display unitgoes to the scanner unit through the inter-connection cable to trigger the transmitter(magnetron). The time taken by the signal totravel up to the scanner unit varies, depend-ing largely on the length of interconnectioncable. During this period the display unitshould wait before starting the sweep. Whenthe display unit is not adjusted correctly, theechoes from a straight local object (for ex-ample, a harbor wall or straight pier) will notappear with straight edges- namely, they willbe seen as “pushed out” or “pulled in” nearthe picture center. The range of objects willalso be incorrectly shown.

(1) Correct (2) Target pushedinward

(3) Target pushedoutward

Figure 3-1 Examples of Improper andcorrect Sweep timings

1. Transmit the radar on the shortest rangeand adjust the [GAIN] and [A/C SEA] con-trols.

2. Visually select a straight echo (harborwall, straight pier).

3. Press and hold down the [MENU] key(about 10 seconds) until the INSTALLA-TION menu appears.

After checking the unit for proper installationits time to adjust it.

WARNINGBefore transmitting the radar make sureno one is near the scanner unit, to pre-vent the potential risk of being struck by the rotating scanner and exposure to RF radiation hazard.

3.1 Preparation

1. Press the [POWER] key on the displayunit, and the front panel will light up. Inapproximately two minutes and 30 sec-onds, the message “ST-BY” will appearat center of the screen. While this warmupis in process, set the [GAIN] control at twoo’clock, and the [A/C RAIN] and [A/C SEA]controls at fully counterclockwise.

2. When “ST-BY” appears press the [TX]key.

3. Bring up the [GAIN] control until a smallamount of noise appears on the screen.

4. Adjust the [GAIN] control on the frontpanel, for a little background noise show-ing on the screen, and then hit the [Range-] key several times to bring you down tothe minimum range. Without disturbingthe front panel [GAIN] control, adjust the[A/C SEA] control until nearby radar tar-gets are clearly shown on the screen. Toomuch A/C SEA action will eliminate smalltargets, and too little A/C SEA action willcause the screen to be so full of targetsand noise that it is hard to determinewhich target is which as compared to vi-sual sightings. Note that adjusting the[GAIN] and [A/C SEA] controls in thismanner (GAIN at long range, A/C SEA atshort range) will equalize the picture atall ranges, and you will not have to jockeyback and forth with the [GAIN] controlespecially when you change range scale.

3-2

MENUSEL MENU BY TRKBALL :ITEMS WITH RANGE KEY

1234

Cursor Program No.

No. of hours radar turned onNo. of hours radar transmitted

03590361xx HD ADJ TOTAL ON TIMETMG ADJ 00000 : 00MAG / GYRO TOTAL TX TIME NM / KM 00000 : 00

Figure 3-2 INSTALLATION menu

4. With the trackball, select “TMG ADJ”.

MENUSEL MENU BY TRKBALL :ITEMS WITH RANGE KEY

1234

HD ADJ DSPL STR TGTTMG ADJ ON SHORT RNG.MAG / GYRO PRESS -/+ KEY NM NM / KM TO STRAIGHTEN.

Figure 3-3 Timing adjustment

5. While looking at the target selected at step2, press the [RANGE +] key if the targetis pulled inward, or press the [RANGE -]key if the target is pushed outward.

6. Press the [MENU] key to complete theadjustment.

3.3 Relative Bearing Alignment

You have mounted the scanner unit facingstraight ahead in the direction of the bow.Therefore, a small but conspicuous targetdead ahead visually should appear on theheading mark (Zero degree).

In practice, you will probably observe somesmall error on the display for most installa-tions because of the difficulty in achievingaccurate initial positioning of the scanner unit,The following adjustment will compensate forthis error.

If you don’t know how to do it well, it’s bestyou leave this part to a qualified technician.(Remember that the scanner housing fixingbolts remain untightened. They should nowbe secured if the following alignment is notnecessary.)

1. Identify a suitable target (for example, shipor buoy) at a range between 1/8 to 1/4miles, preferably near the heading mark.To minimize error, keep echoes in theouter half of the picture by changing therange.

2. Measure the bearing to the target by op-erating the trackball. The bearing is shownat the bottom center of the screen.

3. Using a compass card, visually find therelative bearing to the target.

4. Compare the bearing measured in step 2and 3 above and calculate the directionand magnitude of the bearing error. If theerror is within 30 degrees go to step 9, tocorrect the error at the display unit. If theerror is greater than 30 degrees first makeinitial adjustments at the scanner unit andthen fine tune at the display unit.

HeadingMark

Target

Own ship

AB

Bearing on Radar Bearing on Chart

Figure 3-4 Calculating Bearing Error

5. Press and hold down the [MENU] key(about 10 seconds) until the INSTALLA-TION menu appears.

6. With the trackball, select “1. HD ADJ”. Theheading marker and tuning range mark-ers appear. See Figure 4-5 (a).

7. Identify a suitable target (for example, shipor buoy) at a range between 1/8 to 1/4miles, preferably near the heading mark.To minimize error, keep echoes in theouter half of the picture by changing therange.

3-3

8. Press a [RANGE] key to bisect the targetwith the heading marker. See Figure 4-5(b).

9. Press the [MENU] or select menu by thetrackball to complete the adjustment.

10.As a final test, move the boat towards asmall buoy and confirm that the buoyshows up dead ahead on the radar whenit is visually dead ahead.

Heading Marker

Target

Tuning RangeMarkers

Heading Marker(dotted line)

Figure 3-5 Display during Headingadjustment

3.4 MAG or GYRO Indication

When a gyrocompass or heading sensor isconnected to this radar, select it on the IN-STALLATION menu.

1. Select “3. MAG/GYRO” on the INSTAL-LATION menu.

2. Select “MAG” (factory setting) or “GYRO”with the [RANGE] key.

3. Press the [MENU] key to complete thesetting.

3.5 Range Unit Selection

The range unit of the cursor and the VRM isselectable for either “NM” (nautical mile) or“KM” (kilometer).

1. Select “4. NM/KM” on the INSTALLATIONmenu.

2. Select “KM” (factory setting) or “KM” withthe [RANGE] key.

3. Press the [MENU] key to complete thesetting.

3.6 Measurement of BlindShadow Sectors

In some shadow sectors, it should be remem-bered that there may not be sufficient inten-sity to obtain an echo from very small targetseven at close range, despite the fact that alarge vessel may be detected at a muchgreater range in non-shadowed sectors. Forthese reasons the angular width and relativebearing of any shadow sectors should bedone during sea trails. In other ships it shouldbe done at the first opportunity after fitting anew radar set.

It should be understood that even a smallshadow sector can hide another vessel if it ison a collision course. The bearing will remainconstant in the shadow area and the ap-proach of the other vessel may remain un-detected until it is too late to avoid adangerous situation.

There are two methods of determining theangular width of a shadow sector.

1. Turn the boat very slowly through 360degrees while a small but clearly definedtarget is observed at a distance of a mileor so. (Do not use a buoy with a reflectoras this target is too powerful to achievethe required result.)

3-4

If the echo disappears while the boat isturning, the target has entered a shadowsector and it will again become visiblewhen the target emerges from theshadow. Very quiet considerations of windand sea are essential to ensure reliableresults when this operation is carried outon a small craft since a rough sea cancause a buoy to be lost in the clutter orboat to swing through a shadow sectorbefore the scanner has completed onerevolution. In any case an average of sev-eral observations of each shadow sectorshould be taken. It is a waste of time toattempt the operation in anything otherthan very smooth water with little wind.

2. Another method is to observe the shadowsector against a background of sea clut-ter. Any shadows will show as dark sec-tors in the clutter.

Note that a shadow cannot be fairly esti-mated in heavy clutter, as echoes fromeither side of the sector may be spreadinto it and give an illusion that objects inthe sector are being observed. Nor can itbe satisfactorily determined in confinedwaters, because of the probability of indi-rect, false or multiple echoes being pro-duced from nearby buildings or othervessels.

SCANNER SHADOW SECTOR

BLIND SECTOR

90°

180°

270°

0°

Figure 3-6 Shadows caused by objects Figure 3-7 Shadow sector diagram

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