KODEN RADAR 3210&3220

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SERVICEMANUAL MARINERADAR

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562 93841

7

tI PRECAIITIONS

1. HIGH VOLTAGEWARNING At several points in the scanner unit and dlsplay CRT mount of the radar, there are high voltages enough to ki11 a person coming into direct contact with thern. Although the equlpment 1s designed to avoid danger in ordinary operation, care should be taken during the maintenance works inside the units. Turn off the shiprs main swiLch when checking the circuits or replacing components. Even after the radar is switched off, some capacitors may take several minutes Lo discharge. Before touching the magnetron and/or CRT HV circuits, make sure to ground the capacitors with a clip cord or the 1lke.

2. MICROWAVE HAZARI) Take care to avoid possible harmful effects of mi-crowave radiation valnerfrom the radar to a human body. The eyes are particularly able to microwave. Never look directly into an open waveguide radiating can upset some the power. Radar and other R.F. radiations cardiac pacemakers. If a user of cardiac pacemaker suspects a mu1function, of Lhe anturn off the equipment and leave the vicinity tenna irnmediately. Whenever it is necessary to work on the scanner unit, always set the controls t o S T A N D B Yo r R A D A RO F F .

3. FI]SES Before starting raLed main fuses the radar, confirm that properly according to the ship's main voltage are used. The rated maln and other fuses for MD-3210 and MD-3220 are listed below.

Ship's Main

I'tD-32r0

tfi-3220

(a) Main fuse

T2 VDC 24 VDC

1 5 A 8 A

Not applicable 1 0 A

( b ) C R TH V ( S e e N o t e )

Either

1 l-

(c) Modulator HV

Either

0.3 A

(d) Antenna drive motor

Either

?

J .

1 < L J

A tl

A

N

i A 0.5 A 3 . 1 5A

4. MAGNETRON PREHEATING Before transmitting the microwave for the first transmission after preheat installatlon, or after 2 months or over pause of operation, the magnetron more than 30 minutes by keeping the radar in STANDBY condition. Note:

CRT HV fuse is be1ow, equipped

not used for the unit of serial numbers shown p o w e r with supply I'{D-32I0/3220-6000M3.

MD-3210: No. 2100659 and thereafter MD-3220: No. 3220336 and thereafter

M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O l

.\:

Marine Radar MD-3210/ SZZO INDEX Page IONS PRECAUT 1. GENERAL 1.1 Major Performances 1 . 1 . 1 A n L e n n au n i t 1.I.2 Display unit 1.1 .3 Power supply 1.2 Composition

l-i I-2 I-2 1-3

....

r . 2 . 1M D - 3 2 r 0 / 3 2 2 0

t

II lf

-

-,J

....

...... r-4

1-5 I.2.2 Optional equipment 1-6 .... 1 . 3 S y s t e mC o n f i g u r a t i o n o f M D - 3 2 I 0 / 3 2 2 0 I -7 M D 3 2 I 0 1 3 2 2 0 I.4 InterconnecLion of 1.5 Modification of Speclfications 1-8 1 . 5 . 1 J u m p e rp i n s e t t i n g 1-B L.5.2 DIP switch setting 2. FUNCTIONOF EACHUNIT 2-I .. .. 2 . I A n t e n n aU n i t 2-I 2 . f . 1 A e ri a 1 2-2 2 , I , 2 A n t e n n an o t o r 2 -2 .,.. 2 . I . 3 S H Fa n d A Z I g e n e r a t o r s 2-3 2.I.4 Transmitting section 2-5 2.I.5 Duplexingassembly 2-5 2.I .6 Receiving sectj-on 2-l 2.2 Dlsplay Unit 2-7 2 . 2 . 1 P o w e r s u p p l y ( M D - 3 21 0 / 3 2 2 0 - 6 0 0 0) . . .2-9 .... 2.2.2 Logic section 2-9 ( i ) L o g i c u p p e r ( M D - 3 2 1 0 - 7 0 0 0.). . . . . 2 -L3 (2) Logic lower (MD-3210-7100) 2-I8 .... .... 2.2.3 Control panel (MD-3210-7200) 3. ADJUST]'{ENT .......... 3-i .... 3 . 1 L o c a t i o no f C o n t r o l s 3-l 3 . 2 A dj u s t r n e n t A f t e r I n s t a l l a l i o n 3-1 3.2.1 Tuning ........ . 3-2 3 , 2 . 2 P r e s e t g a i n ( n o i s e 1 e v e 1 ). . . . 3-2 . . . . , . . . 3.2.3STC 3 -z .. .. . 3 . 2 . 4 T r i - g g e rd e l a y 3-3 ............ 3 . 2 . 5 S H Fa n d b e a r i n g. . . . 3-3 3.3 Adjustment of Antenna Unit 3.4 Adjustrnent of Display .... 3-3 3 . 4 . 1 P o w e r s u p p l y ( M D - 3 2 L 0 / 3 2 2 0 - 6 0 0 0. ). 3-5 3.4.2 Logic upper (MD-3210-7000) .... 3-5 3 . 4 . 3 l o g i c l o w e r ( M D - 3 2 i 0 - 7 1 0 0. .). . . . . . . . . . 3-6 3 . 4 . 4 C R Tu n i t ( P \ ^ / D - i 0 5 0 A / P W D - 1 0 5 1 A )

1 -

4. WAVEFORMS 4.I AntennaUnit 4 . t . 1 M R T - 1 3 (3M D - 3 2 1 0 ) .... ........ 4.L.2 mT-134 (MD-3220) 4.2 Display unit 4.2.1 Powersupply 4.2.2 Logic upper 4.2.3 Logic lower OF MAJORCOMPONENTS 5. REPLACEMENT 5.1 Antenna unit 5.1.1 Dismounting transmitler/receiver (TR) unit 5 . I . 2 R e p l a c e m e n to f T R u n i t c o m p o n e n t s 5 . 1 . 3 R e p l a c e m e notf S C O N. . . . . .. . .. . .. ... 5 . 1 . 4 R e p l a c e m e n to f m o t o r b r u s h 5 . 1 . 5 R e p l a c e m e n to f m o t o r 5.2 Display unlt 5 . 2 . 1 C o n t r o l p a n e l ( M D - 3 2 1 0 - 7 2 0 0 .) . ) nd 5.2.2 Logic upper (MD-3210-7000a logic lower (MD-3210-7100) 5 . 2 . 3 P o w e r s u p p l y ( M D - 3 2 1 0 1 3 2 2 0 - 6 0 0 0. ). 5 . 2 . 4 C R Tu n i t 6. TROUBLESHOOTING 6.I Troubleshooting by Observing Display 6.2 Operation Control Troubleshooting .... 6 . 3 A n t e n n aT r o u b l e s h o o t i n g ........ ....... 7. DIAGRAMS 7.L Circuit Diagram ... ... ... . .. 7,2 Drawings for parts location 8 . P A R T SL I S T 8.1 Electrical Parts 8 . 1 . 1 A n r e n n a u n i r M R T - 1 3 3( 1 0 k W ) 8 . I . 2 A n t e n n a u n i t M R T - 1 3 4( 2 5 k W ) 8 . 1 . 3 D i _ s p l a yu n i r M R D - 6 2 / M R D - 6 8 ........... 8.2 Mechanical Parts 8 . 2 . 1 A n t e n n a u n i t M R T - 1 3 3( 1 0 k W ) . . o . 8.2.2 Anlenna unir I'&T-r34 Q5 kW) .... 8.2.3 Display unir MRD-62/MRO-OS 8.3 ExplodedView 8 . 3 . 1 A n t e n n au n i t 8.3.2 Display unit

: f J + J f * * * * : f * : f *

2

4-I 4-3 4-4 +-J

4-5 J_L

<

t

J - L J_L

5-4 )-+ J-+

5-6 -

a

) - l

5-8 6-1 6-1 6-4 6-7 -7 t - I

1

/ -/-4

I

8-1 8-8 8-18 8-28 8-3 1 8-32

8-3s 8-42

SERVICEMANUAL for MARINE RADAR MD_3210 / 3220

1.

GENERAL Koden MD-32L0/3220 series is a highly efficient marine radar which conform Lhe IMO standards Lo be used for a primary radar of fishing boal, workboal, and other vessel less than 10,000 gross weight Lons. The syslem consists of only two units, i.e. the anLenna and display. Excepl for magnetron and CRT, all Lhe active componenls are solid state which maintain high reliabiliLy and mainLenabilitv. The radar display uses a 20-inch diagonal high resolution green monochrome CRT. It employs X-Y coordinates process the radar information to digitally and diqnlav Lhe image with a built-in microprocessor. The radar screen is divlded into number of picture elemenls, so ca1led pixels. Each pixel is assigned wilh X-Y coordinates which corresponds to Lhe memory address. The radar return echoes in polar coordinates for every pulse Lransmission are converLed inlo X-Y coordinates i-n accordance wiLh Lhe distance and azimuth. The distance is oblained from the time duralion between transmission and recepllon of pulse, while the azimuth is given from the antenna unil. The coordinates converted dala is stored inLo memory and Lhen read oul to display Lhe irnage in a raster scan melhod allowing the picLure to be monitored by p1ura1 persons under daylight condiLion without viewing hood. According to the LransrnitLing power, system is classified into Lwo models as be1ow.

M D - 3 201 MD-3220 Antenna

ar^'l

10 kl,J 25 kW

unit

Antenna uniL consj-sls of a 6-fool sloLted array aerial, antenna drlve unil, and transceiver unlt. The slotted array aerial is contained in a reinforced plastic cylindrical case, providing smooth anfenna rotation in a wind load of 100 knots. The antenna unit has been designed as \','aLer-Light, vibration-proof, and weather-reslstant construction. The drive unil and Lransceiver unit are mounLed in a rigid alurninum cast anLenna base. The Lransceiver uniL is a module Lype whlch enables speedy a n d e a s v m ai n L e n a n c e. Dis pla y

unit

The radar picture is displayed on a 2O-inch diagonal high resolution CRT wilh an effecLive diameLer of 12 inches (270 mm). The green mono-color raster p i c L u r e presents crisp and clear irnage under bright daylight scan condition. The display unit mainly consisls of CRT mount, logic circuil, control, and power supply sections, all assembled Logether in a dripproof aluminum case. Each section is of a rnodule type providing easy malnLenance capability. In addition to presentaLion, Lhe radar the ^ ^ - i + . i^ - . i e q u i p m e n l s u c h a s G P S, a n d P U > a L r U l l r . ng daLa f rom an onboard navigational Locan C can be digilally displayed on Lhe screen.

MD-32L0 / 3220 Service Manual-Ol

1-1

1.1

Major

1.1.1 (1)

Performances

Antenna unit Antenna system Aerial

MRA-37

Transceiver

M R T - 1 3 3( M D - 3 2 1 0 ) M R T - 1 3 4( M D - 3 2 2 0 )

(2) Aerial

6-foot

(3)

Antenna rotation

24 rpm

(4)

Ivlaln beam width

Horl zonLaT: 1.2" , Vertical:

(5)

Sidelobe 1eve1

Less than -23 dB from the maln beam

(6)

Transmilting

9 ,4rO t30 MHz

(7)

Peak power output

(B) Type of (9)

Spurious

array

22"

10 k\,./(MRT-I33) 25 kW (MRT-134) PON

enission

( 10) 0ccupied (11)

frequency

slotted

ernission

Less than -40 dB from the main beam of the fundamental frequency outpuL

bandwidth

Within

Pulse width/repetition

110 NIHz

rate

S M1 M2 L

0.08 Usec, 2,000 pps 0.3 Usec, 1,500 pps 0.6 usec, 1,000 pps I.2 usec, 500 pps (Unf-l33/134) 4 3 0 p p s ( M R T - 1 3 4a L 9 6 n m r a n o e )

(12) IF center frequency

60 Yfri,z

( 1 3 ) IF bandwidth

1 5 N I H z( S , M i ) 3 Yfrlz (V12, L)

(14) Receiver front-end

module

( 15) Modulator

M I C ( M i c r o r v a v eI n L e g r a L e d C i r c u i L ) Solid-state

( 16) Environmental

11ne Lype pulser

conditions

Ambient temperature Relative humidity Wind velocitv

-250C ro 70'C 957"at 35oC 100 knots (51.5 m/sec), relative

I.L.2 Display unit (1) Display system

20-inch diagonal

green monochrome CRT

MRD_62( I'D-3210) MRD_68 (2)

Effective

(3)

Range scale

diameter

270

MRD-62(MD-3210) L /4 , r / 2 , 3 / 4 , 1 . 5 , 3 , 6 , 1 2 , 2 4 , 4 8 , 7 2 n m MRD-68(MD-3220) r / 4 , r / 2 , 3 / 4 , 1 . 5 , 3 , 6 , 1 2 , 24, 48, 96 nm

1

L-Z-

t

M D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - O l

(4)

Range ring

interval

M R D - 6 2( M D - 3 2 1 0 ) r / 1 6 , r / 8 , r / 8 , r / 4 , r / 2 , 1 , 2 , 4 , 8 , 1 2 n m M R D - 6 8( M D - 3 2 2 0 ) L / 1 6 , r / 8 , r / 8 , L / 4 , r / 2 , 1 , 2 , 4 , B , 1 6 n m (5) Min. detection range

Better than 23 m on I/4 nm range

(6) Range resolution

Better than 20 m

( 7 ) V R Ma c c u r a c y

5 0 m o r 1 7 .o f t h e s e l e c t e d r a n g e , w h i c h e v e r is the greater

(S) EBL

Accuracy 1o, in 0.2" steps rotation

(9) Bearing resolution

1.8o

( 10) Bearing scal .

Marking Read-out

(ll)

Environmental conditions Temperature Relative humidity

(I2)

1o, 5o, 10" steps (0' to 359') 10o steps

Rotary switch

-15"C to 55oC 9 5 7 "a t 3 5 " C (S'BY, SP, LP, PM) FUNCTION

(13) Rotary encoder

VRM,EBL

(14) Operatioal controls

BRILL, T U N E , G A I N , S T C , F T C , V I D E OB R I L L , M A R K E R BRILL, and track ball P L O TB R I L L , N U M E R I C

( 1 5) M e m b r a n es w i t c h

R A N G E ,D I M , H M , R I N G S , M O D E( H U , C U , E B L, P O \ , , / ,E R N U , T M ), G Y R O ,S P D , T R , E X P, B E A R I N G ,T R A I L ( O F F, 1 5 , 3 0 s e c , 1 , 3 , 6 , 1 2 m i n ) , A L A R M( O F F , 9 0 o , 1 8 0 o , 3 6 0 o ) , S E T ( G Y R O ,A L A R M ) ,O F F C T R , F L T E B L , VECTOR,TRU/REL, DELETE, ALL CLR, ENTER , SYMBOL

( o, [], A, V, O, *)

( 16) Presentation mode

Head-up North-up (option, see Note 1) Course-up (option, see Note 1) T r u e m o t i o n ( o p t i o n , s e e N o t e 1)

Note 1: North-up, course-up, and true motion modesrequire built-in t i o n a l g y r o/ I o g i n t e r f a c e K S A - 0 8 . 1.1.3

type op-

Power supply

(1) Power requirements MD-3210

MD-3220

1 i r o 1 8 V D Co r 2 L L o 3 6 V D C ( S e e N o r e 2 ) N o t e 2 ; l ' 1 D * 3 2 1 0o p e r a l e s o n 2 4 l Z Z V D C m a i n s a s t h e standard. For operation on 12 VDC, change taps of the power transformer in the power supplv MD-32r0/ 3220-6000 ' 24 VDC

(2) Power consumption

MD-3210 MD-3220

140 l{ at 24 VDC 1 6 0W

M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1

1-3

L.2

Composition

L .2.1

MD-32IO/3220

( 1) Standard equiprnent list

No.

Descriuption

1

Aerial

2

Transceiver Dslplay

unit

unit

4

Vinyl

5

Connecting

6

Power cable

-,

Rating

Renarks

Weight/Length

span

B k g ( 1 7. 6 l b )

1

Q'ty

MRA_37

6-foot

MRT_133 MRT_134

For MD-3210 For MD-322O

77 kg (37.s lb) 2 0 k g ( 4 4 . o 1 b)

1 1

MRD_62 MRD_68

For MD-3210 For MD-3220

37 kg (81.4 1b) 37 kg (81.4 1b)

1 1

For display unit

cover cable

1

9CD-3292C CW_89

15

( 4 9. 5 f r )

t

5

( 1 6 . sf r )

1

250V-DPY2.O 8 . 5 m m0 , w i t h o n e end connector

Spare parts

See spare parts list

1

SCL

8

Installation materials

See installation maLerial list

1

J C L

9

Operation

a n { -

manual

1

(2) Spare parts l1st No.

Description

Rating

Use

PID-3210

|

m4220

Q'ty

I

Not applicable

2

1

Fuse, main

ls A

(F-716s)

For 12 VDC

2

Fuse, main

8 A 10 A

(F-716s) (F-7165)

For 24 VDC I Not applicable Not applj-cab1e 24 VDC lFor For 10 kW TX I not applicable Not applicable For 25 kW TX I For MD-32I0/3220, see Note

F u s e , M O DH V 0 . 3 A

0.s A 4 J

6 -l

Fuse, CRT HV 1 A

(F-7165) (F-716s) (F-7r42)

Z

2 2 2 z

Fuse, motor

3 . 1 s A ( T L C 3 . 1 s A )For antenna, lulD-32I0/3220

L

Lamp

KCDS_05

For control

L

Molor brush

242125209

For antenna motor, MD-32I0/3220 I set

panel, MD-32I0/3220

Note CRTHV fuse is not applied for the serial numbers shown be1ow, equipped wirh power supply I'lD-32I0/3220-6000M3. M D - 3 2 1 0 : N o . 2 1 0 0 6 5 9a n d r h e r e a f r e r V I D - 3 2 2 0 :N o. 3 2 2 0 3 3 6 a n d r h e r e a f r e r

L-4

M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1

-

(3)

Installation

material

list

Rating

Description

No.

Use

Q'ty

I

Coach screw Plain washer Spring washer

CW9x 50S W 1O S SWlOS

For display unit

6 6 6

z

Hexagonal bolt Plain washer Spring washer NUL

BLz x 55U

For antenna unit

4

J

I .2.2

2\]IzU sh/12u N1 2 U

Anti-corrosion washer

30

Anti-corrosion washer

50

Optional

a

Rating

1

Gyro/Log interface

KSA_OB

I

Hood

HD-1100

Base

0 019 - r 2 r 9

4

Rectifier

PS-00s

5

Navigator ing cable

-)

For antenna

unit

4

For antenna

unit

4

equipment

Description

No.

B 4 B

connect-

Built-in

Remarks

Weight/Length

type

kg (2.2 1b)

Bulkhead mounting 8 kg (17.6 1b)

CW-94

With BNC/6-pln plugs

5 m (16.5 ft)

CW_i53A

With 6-pin plugs

5 m

cl,\I-155

With BNC/6-pin plugs

5 m

MD-32I0/3220 Service Manual-01

t \ L-J

1. 3

System Configuration

of I'[D-3210/ ZZZO

Antenna Unit Aerial MRA-37 6-foot

T ra n s c e i v e r l'tRT-r33 (t'tD-3210) t"tRT-134(lrD-3220)

Antenna cable 9CD-3292A t0 9CD-32928 20 9CD-3292C 1s 9CD-3292D 2L

m m m, standard t o 4 0 m

D i s p l a y Unit l"{RD-62 (r'fD-32r0) MRD-68 (t'tD-3220) From NavigaLor (opt ion) -l I

Gyro-1og Interface

: - - -l *ro-ou -::: ff;'=il::i' fJ _:::: Log signal --

l----;(BuilL in the display unit)

-

to 4o vDC

tl

Power cable

ct.J-89 1 l ro 18, 2t ro 36 V D C (MD -3210) 24 VDC !tO7" (t{t-322o)

Rectifier

----- -l ps-oosl- r

l

,

I

I

r

100/1L5/2oo/230vAC Dotted lines---

Antenna Unit

Model A e ri a l

1-6

show option.

Display Unit

Transcei ver

I'lD-3210

MRA_37

MRT_133

I'[RD-62

t{D'-3220

I'[RA-37

l,tRT-134

I'{RD-68

M D - 3 2I O/ 3 2 2 0 S e r v i c e M a n u a l - O l

Interconnection

I.4

of MD-321O/322O

Wire Color VIOtff

ANTENNAIINIT

BRorrN r J----rr--!rl---4

1}.b.-l

'€

i4'-"-ll ll I SCANNERCONNECTION BOARDr--

(s coN)

'T.?ff pt

, . , x r . , xl L ) (f_|d

o

I

r[r> ;'

ffi

I r

.rsn*: tSQ'E^l ' | t * | | 'O ru-t

$'q{ nP clamP

Cable

wire ends lnto Insert terminals and fix them rviLh a screw driver. Anttlntra

Lef t

t

Green I \Jhire BTdCK BOLD:Thick wire PINK Lighr: Thin wire Vi o l e t h l h i t e / g r e en Gray GREEN BLT]E No connecLion No connecLion \Vhire/red Y e1 1 o r i Brorvn Coax. GND RED 0range Red GRAY Coax. GND Ri ght

I

cable

) 292 9CL)--

KSA-Os-6200 Synchro 14

DISPT-AYTJNIT

Q l

s2

Lype Gyro

s2

qa

R1 R2 coM GND LOGl LOC2 LOG3 LOG4

Step type G1'ro

Qr

qa R1 ru C'M GND

Contact type log Photo-coupler type log

See para. | .5.2 DIP for selting suiLch Lo select Lype of Gyro.

I /i\ (z+,

)< \1,

or v D C( M D - 3 2 r 0 ) !to7" (l,tD-3220)

Signal Shield C W - 1 5 5o r

24 V D C

Ship's mains 100/l 15/200/230 vAc

Rectifier PS-005 (option)

MD-32I0/3220 Service Manual-Ol

L-7

r.4

Interconnection

of MD-321O/3220

LCL

ANTENNAI.INIT

5,l-li'

i.l

e ,

G;ffi,

J-------r.:--!r-L--4

I ik -u; I

SCANNERC0NNECTION BOARDr--

.FF -lc

lI[-J :rf-.r*.r.

ir

(s coN) gg' -

lt-) l'o

ll'r) -g,_^ -=

3l*

-]

Fd,ffi ,-ff1*Y'*1

Cable

Wire Color VIOI-ET BRCft'lN Green I \{hi re BLACK BOLD:T h i c k w i r e PII{K . I i o h t Thin wire Viol et llhi tel green Gray GREE}I BLTIE No connecLion No connecLion \Vhire/red Y e1 1 o r , ' Brorvn Coax. GND RED 0range Red GRAY I Coax. GND Right

r I

clamP

Insert wlre ends into terminals and fix them with a screw driver.

L

Antrlrrrra cable

9C t)--t2 9 2

KSA-O5-6200 Synchro I4

DTSPI-AY TINIT

S1 S2

type G;'ro qr

Step type G yr o

S2

qa JJ

R1

R1

n<

ru

coM

@M

GND LOGl LOG2 LOG3 LOG4

GNO

Contact type 1og P h o t o - c o up l e r type 1og

Seepara. I .5.2 for setting DIP swiLch to select rype of Gyro.

f?^;3u,;"i;;"@ E ffi[l] ;3.3;;,Tiir; @a ffi[1] e) Signal )< t)

Power cable

c\V-89

Shield

C r i -1 5 5

24 VDC

(*-) ll to lB or 2I Lo 36 VDC(MD-3210) 2 4 V D Ct 1 0 Z ( t ' t D - 3 2 2 0 )

Ship's mains 100/l rs/200/230 vAc

Rectifier PS-005 (option)

MD-32I0 / 3220 Service Manual-0l

t-7

I .5

M odif ic ati o n

1 . 5. I

of

J um p e r p i n

S p e c i fi c a ti o n s

s e tti n g

fn order to set operational conditions of the unit, flve jumper pins are provided on the logic lower board (MD-3210-7100).Functions and initial setting status of those pins are listed as follows:

1.5.2

Jarper Pin llo.

Function

JP1

Level of plottins image

ll: 3rd and 4th levei of quantized 4-level videosignal are plotted.

H : 0 n 1 yt h e h i g h e s t (4th) level video signal is plotted.

JP2

Selectionof trigger

OFF:Internal

Olf: External

JP3

C o m p o s i t i oonf v i d e o s i e EX0R:Video signal lf0Rll:Video signal n a l a n dm a r k e ri i n e s ( E B L , i e v e l b e c o m e[s1 o w ] and markerI ines VRM,SHF',and fixed range wheremarkerlines are superirnposed. markerrings) ride on.

JP4

Statusof output video

Ml{: Rawvideo

JP5

Number of horizontai scanning iines

1 , 1 5 3 :F o r 2 0 - i n C R T 1 , 0 8 9 :F o r 1 5 - i n C R T

I nitial settins

Modification

PR0:Videosignal processed on STC, FTC,andgain

DIP switch setting T h r e e D I P s w i t c h e s , f r o m S W l t o S W 3a r e m o u n t e d o n t h e l o g i c u p p e r b o a r d ( M D - 3 2 1 0 - 7 0 0 0 )i n o r d e r L o p r e s e L t h e o p e r a L i o n o f e q u i p m e n t . F u n c t i o n s set by those switches and their standard settings are listed below.

SH1 Elerent

Function

lfo. 1 I

2

1-B

Input data format

oN-r NMEA_ OFF_-l KODEN-0N r NMEA- OIF1 No O N J 0i83

0N r 7r7

J 0182 OFF

','200. 0N -l 400 6Xp:1,.

QlPr

-l OFF I OFF

isp*t

3 4

Speedlog p u l s er a t i o

100 0 NI 0Nr

5

Bearingdata

0 N : S e r i a l ( L o r a n ,G P S )

6

Gyrodata

0N: Connected for NU,CU,or TM 0IF::::Not [611xsc[sfl

7 8

GyroBOar ratio

0 NI 3 6 : 1 0Nr

fllrf J

OF_ F1 9 0 : 1 ON-J

-J OFF

500

QIP;::P6sa1,le:I : (XSA-08)

0N I 180:1 OFF'I

IO/ 3220 Service Manual-O1 t"lD-32

DIP switch setting,

continue

sHz

Elenent l{o.

Function

1

Rangesetting

ON: ,

2 3

Maximum range

_1 Not 0 N t 6 4 n m OFF I _J used OFF OFF

u t

4 , B nmseries

0F8,1.,,,3.,,, 0,;,.,.12.,.qil:,:S,elle-$i

,0t+1" ,72;.,*,, 0rr,;,.,96,;p. ONr':

:

MD-3210 4 q

6 7 8

EXPeffect range 0N: Above3 or 4 nmrange Trail mode

0N;::[ateSt: four:traCks

T r a i l s a m p l i n g 0N: Everyantennarotation VRMunit

Qlif J

t4D-3220

AII O F F :C o n t i n u e all tracks

g.rvaI s.,. y.,.hp. sg-t,.,,h QF.E, i,,,,.l.Q-t -

0N: km/hour

Nautlcalmile

Performance monitorl Oll: Connected

sH3

Elenent lfo.

Function

1

Notused.

,

Notused.

u

3

Speeddata

4

Off-centering mode

5

P a r a1l e l curs0r

dd,..,. Q[I, ;,.,,0. 1.Iy.,,E8,[-,., i .q,. d,i ! p1-a.y

Wavpoint

0 N : D i s p l a yW P( w a y p o i n t )

A

0 N : S e r i a l ( L o r a n ,G P S )

1.,.(K$4.:0S ,,,P_aral,le ):,.

0f!1 Mqve213radiusto stern 0[{,;,,,,M0ye..t0: ,with,,,iurSoi', :ant,.,p-o,in!,. Ui[.h,ilf.i,rl3,:,iadi,us, 0 N : P a r a l l e l c u r s o ra n d E B La r e s e l e c t i v e l yd i s p l a v e d

7

CRT size

jumperpin JpSmustbe 0N, 15" Note)MD-3210-7100 0F_{ii.,.,2(!.]:'i set to 1,089for 15" b. t,fSS for 20" CRT.

B

Resettine true motion di splay center

0N: Sweep 0rrgrnreturnsscopecenterwhentraveiled tq \'!P- 213radiusahead. ':.: oi,igin,,' i'S'.:iet :':2rc"iadius,'of OIF::: :$weep: f :fism:'Scope: ',,,,,,, ,-,-,coR-!Qf

M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1

r-9

2. FI]NCTION OF EACH T]NIT 2. L

A nt e n n a U n i t antenna drlve mechaarray aerial, The antenna unit consists of the slotted assembly. The transmitter receiver, and T/R switching nism, transrnitter, with HT supply and trigger consists of the magnetron and modulator circuit Fig.2.1 illustrates amplifier. the block diagram of the antenna unit, and Table 2.I lists the composition of antenna unit. AeriaL S HF G e n . Dnf

:

nrr

Motor

Jo'int

Fig. 2.I Block Diagram of Antenna Unit

(s c0N)

A ZI G e n .

1 4 a g n er to n ircuIator' HT Supply & ModuLator

Table 2.I

I F Amp.

L'imiter'

Composition

N o . Description

of Antenna Unit Part No.

Function

t[RT-133 1 Aerial

Scanner Connection

RF emission tion

Motor with

rotation Aerail and AZI pulse generation

23G53203

23G53203

HT supply and pulse modulation

239U522368 ( 10 k1,{)

229U25361. (25 k\,\/)

5 Magnetron

X-band RF oscillation

MSF1 4258

E3564A

6 Circulator

RF sigal

FCX6B

FCX68

NJS6930

S_LX17

NJT1946

S_RX34

239U52512

239U52512

Modulator

'7

L i mi te r

B MIC

r '

MRA_37 (6-ft )

^ r

ni ni nn

r

MRA-37 (6-fr ) FRS-901-3

SHF generator

L

I

and recep-

I'[RT-134

Ship's heading flash generation

duplexing

Protection

of

receiver

RF amplification and frequency conversion

9 L o g IF a m p L o g a r i t h m i c

IF amplific-ation and detection

FRS-901-3

2.I .I Aerial The antenna unils of MD-3210 and MD-3220 are respectively provided with a 6-foot aerial for transmitting and receiving radiowave. The aerial is a non resonant type slotted array waveguide whlch radiates and receives an X-band horizonLal polarization microwave.One end of the aerial is connected to the magnetron via rotary joint and circ-u1ator, while the other end is terM D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - 0 1

2-1

minated with a matching 1oad. The vertical beam width 22o is wide enough to avoid losing target echoes when the ship is rol1ing. The horizontal beam width I.2" of 6-foot aerial gives good bearing resolution. Fig. 2.I.I 11lustrates an example of slotLed array waveguide aerial.

SL o t t e d w a v e g u ' i d e

M ai n b e a m di rection

Fig.

2.I.1

Slotted Array Waveguide Aerial

& 7

/

-

F e e d in g e n d

2.1.2 Antenna motor The antenna motor rotates at a speed of 2,160 rprn. It has built-in 15:1 reduction gears, and the plnion shaft is coupled to the main gear with reduction rate of 6: I to rolate the aerial at 24 rpm. The motor is powered from 24 V DC with power consumption of 15-watt. A photo-interrupLer is mounled on the motor to generate azimuth (AZI) pulses. Fig. 2.I.2 shows a simplified schematic of the antenna motor assembly.

SL o t t e d A r r a y A e r i a L Pini on Reduction Motor^

A ZI G e n er ^ a to r Fig. 2.I .2 2.I .3 SIIF and AZI

Antenna Motor Assenbly

generators

(1) SHF A lead switch associated wlth a magnet is provided for generaLing the ship's heading f lash (SHF) signal. At the moment when the rnagnet rnounted on the main gear passes by the lead switch, the contact closes and gen* erates negative phase SHF pulse signal. The signal is fed to the buffer amplifier Ql-d of the scanner connection board (S CON), and then delivered to the display unit via pin #18 of E1.

(2) AZr 0n the end of the motor shaft opposit to the pinion gear, a hole is made along the diameter. As shown in Fig. 2.I.3.1, the holed end of the shaft is inserted into the photo interrupter Q3 which produces two pulse signals at every rotation of the shaft. As the motor normally rotates at a speed of 36 revolutions per second, the repetition rate of signal 1s 72 pps. The aerial is rotated at one 90tfr of the motor revolution with the built-in gears and pinion/main reduction gears, 180 pulse singals are produced per one revolution of the aerial. The signal is fed to the buffer amplifier in Ql-b, and then to Q4 of the PLL frequency multiplier 1 1 z-- z-

t " l D - 3 I20 / 3 2 2 0 S e r v i c e M a n u a l - 0 1

(S CON) board. The multiplier of a the scanner connection Q4 consists (VCO). When the AZI phase comparator and voltage controlled oscillator pulse train E3, from the motor is fed to Q4 pin #L4 via AZI IN terminal made of C7, CB, Q2, Q3, and R8 through R10 lowers the level the circuit The Q4 output frequency of Q4 pin #5 which makes Q4 to start operation. is ordinarily divided into I/S by dividers Q5 and Ql-a. The phase difference between output signals of the divider and buffer Qi-b is detected by the phase comparator. The error voltage is fed to the VCO so that The outthe output frequency of Q4 is held at five times of the input. (AZIP) to the disput of Q4 is delivered as 360 Hz azimuth pulse signal play via buffer Qi-c. S H Fs w i t c h Motor Shaft HoLe Photo Interrupter 03

Divider 1/6or 1/5

Buffer 0 1- d

Q5, Q1-a

Azimuth puLSe

Buffer o 1- b

L'

(S CON)

B1ock Diagram of SI#/AZI Circuir

Fig.2.1.3.1

SHF puLSe

F i g . 2 . I . 3 . 2 s h o w st h e w a v e f o r m s o f t h e A Z I c i r c u i t . E3

04-3 04-4

F _fl_Itj-l

f

[-1

72Hz 360 H2

-.--l

F-

2-8 msecapprox

o 5 - 15 o5-9 (Load ) Fig. 2.L .4 Transmitting

2.I .3.2

Waveformsof AZI Circuit

section

The transmitting section mainly consists of the nodulator, pulse transforme r , a n d m a g n e t r o n . M R T - 1 3 3f o r M D - 3 2 1 0i s b u i l t w i t h a 1 0 k W m o d u l a t o r , a n d M R T - 1 3 4f o r M D - 3 2 2 0w i t h 2 5 k W m o d u l a t o r . T h e o p e r a t i o n a l t h e o r y o f m o d u l a tor is similar to both models; however, number and ratings of some components are different. In the following description, the ratings and compo* nents with brackets t ] apply to 25 kW modulator. Fig. 2.I.4 showsa simplified block diagram of 10 kW modulator together with pulse transformer, magnetron, and protection diodes. Refer to respective circ.uit diagrams for detailed numbersof the circuit comDonents. ( 1) Modulator A Itwo] thyristor is used for producing hfgh voltage negative pulses to actuate the magnetron. Capacitors C9 to C16 [C9 to C22] of the pulse f o r m i n g n e t w o r k ( P F N ) a r e c h a r g e d u p b y t h e + 3 0 0 V ( M O DS ) s e n t f r o m t h e MD-32I0/ 3220 Service Manual-O1

. \ 2 L_J

display power supply, via charging choke T1 [Ll] and series diode Q7. The charging operation utilizes the resonant frequency determined by inductance of the charging c.hoke and capacitance of PFN. The charging current flows only in the positive half-cycle of the resonant sinusoidal wave and the voltage reaches twice as much of the source voltage. The diode Q7 blocks reverse current series flow in the falling perlod so that the line is held in high voltage. I

I Ch a r g ' i n g

I,chokT e1 | -

H.T, s u p pL y

Seli es d ' io d e Q 7

t--KTlTK-ZII-Ksl L-J

L--J

llagnet ron M icr o w a v e

ChokeL9 Thyli ster Q9

Trigger i nput

Trigger

Protecti on diodes

P r o t e c ti o n diode Q10

GND M a g n e tr o n heater

Mag. Cur. detector

I Fig,

2.I.4

Sinplified

P ut s e t ransformer

Block Diagram of 10 kW Modulator

S h o r t l y a f t e r t h e c h a r g i n g v o l t a g e b e c a m e m a x i m u m ,a t r i g g e r p u l s e i s given to the gate of thyristor Q9 [Q9, Q10] and then Lhyristor conducts d i s c h a r g i n g t h e P F N . T h e L a n d C o f P F N a r e s w i t c h e d b 1 , 'r e 1 a 1 ' s K l t o K 3 as shown in the list below to determine the pulse lensLh. Table 2.I.4

Pulse Length Switching

Pulse length ( u s e c)

0.08 0.3 0.6

r.2

R el ay

K1

K2

K3

OFF ON ON ON

OFF' OF'F ON ON

OF'F' OF'F OFF' ON

The protection d i o d e Q l 0 I Q l 1 ] a v o i d s d a m a g eo f t h y r i s t o r reverse voltage. Choke L9 IL9, L10] protects the thyristor current at the momenl when i t i s t u r n e d o n .

caused by a from a rush

The circuit around T2 [L13] and Q11 [Q13] i" provided to detect the maenetron current for monitoring the performance of the transmitLer. (2)

Pulse transformer

and magnetron

When the thyristor conducts, a discharging currenL flows from PFN capacitors through the primary winding of pulse transformer (PT), producing high voltage negative pulse. The output voltage of PT is Lhen stepped up to 5.8 kV [7.8 kV] to energize the magnetron Vi. As the PFN impedance is designed as matching to the magnetron impedance via pulse transformer, the energy from PFN is efficiently transferred Lo the 1oad. Unavoidable s11ght mismatching between them may cause to induce a reverse voltage at the magnetron cathode. Protection diodes Ql and Q2 with Rl are provided to shunt the reverse voltage to protect the magnetron.

2-4

l4D-32L0/ 3220 Service Manual-Ol

2.I.5

Duplexing

assenbly

V4 and limiter V5. Circulator The duplexing assembly consists of circulator FCX68 for both type scanners functions to switch the microwave signal among periDuring the transmitting the rotary joint, transmitter, and receiver. feeds the high power magnetron output to the slotted od, the circulator arIn the receiving periray aerial without leakage to the receiving section. microwave signal od, the clrculator transfers the receiving to the front with verv 1ow loss of the po\,{er. end module via limiter

T h e l i m i t e r d l o d e N J S 6 9 3 0[ S - L X 1 7 ] p r o t e c t e s L h e f r o n t e n d m o d u l e M I C f r o m a high power microwave invasion, internally from Lhe magnetron or external1y from other radars. 2.I .6 Receiving section The receiving section consists with a logarithmic amplifier. ( I ) Front

of

the

front

end module (FEM) and IF

unit

end module (FEM)

A rnicrowave integrated clrcuit so cal1ed MIC is used for the front end module (FEM) of the receiving The i0 kW output scanner MRT-133 section. uses the MIC type NJTi946, while 25 kW scanner MRT-134 uses type S-RX34. Both types require separate limiter, i.e. NJS6930 for MRT-133 and S-LXI7 f o r M R T * I 3 4 . T h e I V I I Cm a i n l y c o n s i s t s o f a w a v e g u i d e - t o - c o a x i a l convertFET 1ocal osci-llalor, er, 1ow nolse fronl end GaAs FET amplifier, ba1anced mixer, moniLor circulL, and power supply. A11 elements are mounled in a single module, making the FFM so compact. The GaAs FET amplifier directly amplifles the X-band microwave of the returned echo signal. The FET 1oca1 oscillator frequency in 9,470 MHz is simply controlled by varying The balanced mixer converts the receivlng the tuning voltage. signal f requency to 60 NH,z intermediate f requency ( IF) . Fig . 2.I .6 illustrates the block diagram of MIC front end module. M o n it o r

M o n it o r C ' ri c u i t

RF i nput

W a v e g u 'di e to-coaxi aL Converter

GaAs FET AmpLifier

B aL a n c e d Mixer

P o w er S u p pt y

F E T L o c aL 0sci t tator

O p er a t i o n V oL t a g e (+5 V)

Fig.

2.L.6

IF out put

T u n ' in g V oL t a g e (+4 V to +24 V)

GND

Block diagram of MIC Front End Module

MD-32IO/ 3220 Service Manual-0l

2-5

(2)

IF unit The IF unit pass filter,

mainly consists of the logarithmic amplifier,

preamplifier, low-noise linear and tuning indication circuit.

band-

Transistor with approx. 20dB gain. The Q6 makes low-noise preamplifier rrQrr receiving bandwidth of the amplif ier is determined by of the bandr f Q r f ( B P F ) pass filter made of Ll and C54. The is controlled by BW signal sent from the dlsplay, pulse width as shown according to transmitting in Table 2.1,6. In long ranges, BW signal becomes 12 V and diode Q5 is t r Qrf fr Q r r cut of f increaslng High brings sharp resonance of the circult. and high gain to the amplifier. In short ranges, BW signal becomes 0 V frQfr turning Q5 to conduct, lowering L o w f f Q r rb r i n g s b r o a d of the circuit. resonance with high fidelity presenting short range images. for clearly

Table 2.L.6

Tx Pulse Width vs IF Bandwidth

Tx Pulse l{idth ( u s e c)

IF Bandwidth ( M H z)

BW Signal

0.08& 0.3

15

O V

0 . 6& r . 2

5

+L2V

The logarlthmic IF amplifier circuit is made of cascade connected seven dual-gain log-amplifiers having high fidelity of pulse signal anplification. The IF signal is amplified by Q6 through Q35, and then detected by by the video amplifiers Q37. The detected signal is then amplified Q39, a n d Q40, Q41. Amplifiers output of Q6. The transmitQ43 through Q51 receive partial ting pulse leaked from circulator and converted to 60 NIHz IF by FEM is delecled by this circuit and transformed into DC voltage for tuning indication in the display. The bandwldth 5 Wlz of the circuit is given by C74 and T2. In order to avoid interferences of other radars for stable tuning indicati-on, period when Q43 is enabled only for Lhe Lransmitting TRIG signal is applied.

The front end module MIC tuning voltage +25 t5 V is supplied from the display. The semifixed resistor Rl is adjusted so that the receiver is tuned to the best polnt on the long range when the voltage is +25 V.

2-6

M D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - 0 1

2.2 Display

unit

The display semblles.

unil

consists

(1) (2) (3) (4) (5)

Power supply Line filters Logic upper Logic lower Control panel with membranesheet ( 6 ) C R Tu n i t

The block

diagram of

of

the

following

printed

circuit

boards and as-

MD-32 LO/ 3220-6000 M D - 3 2 1 0 - 6 1 0&0 L F 2 i 5 N E W MD-32 10-7000 M D - 3120 - 7 10 0 MD-32 10-7200 KzOMM-O 1B

the display

unit

ls

illustrated

in

Fig.

2.2

From Gyro'-"-) I

r-----",-_-i--l I

I G Y R OI N T E R F A C E I

KsA-08 I i i'iiA-iit-7ooo'l

iipl-qi-qp.go_: I

I i'i{ir:cis:a2oo-r

To/from ANTENNA UNIT

Fig. 2.2 Block Diagran of Display Unit 1 2 1 2 4 1 3 2V D C( i l D - 3 2 1 0 ) 24 VDCt10Z 0{D-3220)

2.2.I

Power supply (l'lD-321O/322O-6000)

M D - 3 2 1 0i s o p e r a t e d b y t h e s h i p t s m a i n s o f 1 1 L o 1 8 , o r 2 I t o 3 6 V D C , w h i l e (MD-3210M D - 3 2 2 0b y 2 4 V D C I I O Z . T h e s h i p ' s m a i n i s f e d v i a l i n e f i l t e r s 6100 and LF-215). The power supply MD-32I0/3220-6OOO is used for both type radars. The power supply converls the ship's mains to several kinds of supp 1 y v o l t a g e s b y m e a n so f a p u l s e c o n t r o l l e d s w i t c h i n g r e g u l a t o r . F i g . 2 . 2 . I (a) shows the block diagrarn of the power supply and line filters. (f)

Control circuit The control circuit (IC3) functions Lo oscillates the swltching square wave signal and controls the duty of that signal in order Lo regulate the output voltage 1eve1. When the power is Lurned 0N by pressing the POWER switch, approx. i0 V starting vollage is given lo the control circuil. According to the CR constant (CB, R20, and VRl) connected to the

M D - 3 2 I O/ 3 2 2 0 S e r v i c e M a n u a l - 0 1

') L - t

-7

IC, the circuit oscillates a switching signal ln a frequency of 70tlkHz. Half-c.ycles of the signal are alternately applied to push-pu11 switching 1 and 2 respectively. The width of applied square wave is concircuit so that the output voltage of the circuit is stabilized. trolled

+ 8 V L'ineFiLters 12/?1V !10t

tYlD-3210-6100

&

S w it c h i n g Circuit 1 Q 1, 2 , 1 1, 1 2 Reg.+/-1? V & Const.Current Rectifier D 1, 3 3 , 3 4 , r c l , 5 r 4

L F - 2 15 Switching Circuit ? Q 3, 4 , 1 3 , 11

+ 10 0 v Rect'ifier D 4 t o 7

O v e rV o L t . Q9, 10

POI"JER Switch

P o w er 0 N a 5 t o 8

C o n tr o L Circu'it

Power 0FF Q 16 , 1 7

rc3

Soft Start c11 P:

o ou.)

o a s l o r 1 -

(-) U1

c-) - t X < > a

O

= : . >

o

o t r r

o (o

-) o

z. a J 4 F =

z.=d. - c L o < = 2 .

= (-) o

-t o :

.. e-g-i, J vrt_=

= - o> _ 0e . t

I

tztdtzttl'tz.l

I l+l(,l+lol

-f-rFr-l

t9l-tc"t