Simrad RA771UA Instruction Manual
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Simrad RA771UA Instruction Manual

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SIMRAD MARINE RADAR
INSTRUCTION MANUAL
PIN 855-106335

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Summary of Contents for Simrad RA771UA

  • Page 1 SIMRAD MARINE RADAR INSTRUCTION MANUAL PIN 855-106335...
  • Page 2 INSTRUCTION MANUAL TYPE CORPORATION...
  • Page 3 WARNING HIGH VOLTAGE High v o l t a g e r a n g i n g from 300V t o a r e used i n t h i s equipment. D o n o t t o u c h t h e i n s i d e of t h e equipment d u r i n g i n s p e c t i o n , r e p a i r , maintenance u n t i l you are c e r t a i n t h a t t h e power s w i t c h...

  • Page 4: Table Of Contents

    CONTENTS GENERAL I n t r o d u c t i o n 1 . 2 F e a t u r e s OPERATION 2 . 1 Key Layout O p e r a t i o n B a s i c 2 .

  • Page 5: Specifications

    5 . 9 I n t e r f a c e 5 . 9 . 1 Compass I n t e r f a c e I n t e r f a c e f o r 5 . 1 0 C o u n t e r m e a s u r e m e n t E l e c t r o m a g n e t i c I n t e r f e r e n c e (EMI) 5 .

  • Page 6: General

    GENERAL I n t r o d u c t i o n i s a Marine Radar m a r i n e n a v i g a t i o n a l p u l s e r a d a r w i t h 4kW peak power o u t p u t f o r s m a l l a n d medium- sized v e s s e l s .

  • Page 7: Operation

    e a s y measurement of t h e b e a r i n g and r a n g e of a n y t w o selected p o i n t s . Guard Zone s e t An alarm zone s e c t o r c a n b e by u s i n g a n d...
  • Page 9 Range Pulse Width(+s) /Repetition (Hz) 0 . 2 5 0 . 8 600) 0.08 / 1800 *(ST ON: 0 . 2 5 / 1200) 0.5 to Press the GAIN key to set the gain adjustment mode. The underline shown below will be displayed on the screen.

  • Page 10: S E A C L U T T E R S U P P R E S S I O N (Stc)

    Operate Keys and C o n t r o l s Depending a f t e r . Refer p a r a g r a p h on Circumstances suspend once. radar o p e r a t i o n Press t h e OPERATE...
  • Page 11 P r e s s t h e k e y . The i n d i c a t i o n shown below w i l l AUTO b e d i s p l a y e d a n d t h e a u t o s e a - c l u t t e r s u p p r e s s i o n mode s e t .
  • Page 12 Press t h e AUTO k e y . The i n d i c a t i o n shown below w i l l s e a - c l u t t e r mode be d i s p l a y e d and t h e a u t o s u p p r e s s i o n s e t .

  • Page 13: M E A S U R I N G Target B E A R I N G S (Ebl)

    Rain and S n o x C l u t t e r S u p p r e s s i o n 2 . 4 m o d e d i s p l a y e d and t h e r a i n and s n o w c l u t t e r s u p p r e s s i o n set.

  • Page 14: T O Measure A C C U R A T E Ranges (Vrm)

    Press t h e r a n g e r i n g key o n c e more t o erase t h e r a n g e marker r i n g s . 2 . 6 . 2 T o Measure A c c u r a t e Ranges (VRM) select P r e s s t h e VRM key t o t h e v a r i a b l e r a n g e m a r k e r...

  • Page 15: F F - C E N T E R I N G

    g u a r d zone i s s e t a n d key. T h e d i s p l a y e d as an area bounded by s o l i d l i n e s . a n g l e of T h e i s s e t i n 5.625 d e g r e e i n c r e m e n t s .

  • Page 16: W I T C H I N G T H E D I S P L A Y Modes

    t h i s mode, t h e p i c t u r e d i r e c t i o n s e t t o t h e d i r e c t i o n t h a t t h e s h i p ' s h e a d i n g i s d i r e c t e d .

  • Page 17: R E T U R N T O T H E Radar Mode

    2 . 1 6 . 2 R e t u r n t o t h e Radar Mode emerges. P r e s s t h e o p e r a t e k e y . The r a d a r p i c t u r e 2 .
  • Page 18 TRACK, OFF-C, ST, GZ, RINGS, GAIN, STC, FTC, HM(SHF OFF), MODE, EBL2, VRM2, FLT(f1oating for EBL2 and 2 O F F C 3 ST 4 G z RINGS F r c G AI N 10 MODE 14 IR Select the key position by the range up/down key, and set the function number to the key by the control knob.

  • Page 19: A V I G A T I O N Data D I S P L A Y

    counterclockwise); turning the control knob counter- clockwise makes the heading marker move clockwise). Each movement is in 0.1 degree steps. 2.11 Navigation Data Display (1) Latitude/Longitude When the Latitude/Longitude data from a navigational equipment are fed through the NMEA-O183(format:GLL), the lower part of the screen.

  • Page 20: A U T I O N

    Then t h e LAT/LON c h a r a c t e r w i l l r e t u r n n o r m a l , a n d t h e d a t a w i l l r e t u r n y o u r s h i p ' s p o s i t i o n .

  • Page 23: Echo Strength And Incident Angle Of Target

    of Target Echo Strength and Incident Angle The strength an echo pulse, arriving at the radar receiver from target, dependent not only upon the distance to the target, its height above sea level and size, but also upon the target configuration and material.

  • Page 24: False Echoes

    3 . 4 False Echoes Echoes from targets which do not actually exist in that direction may appear on the They are referred CRT. to as "false" or "indirect" echoes. The causes and of such false echoes are listed below. phenomena Virtual Ghost Echoes...
  • Page 25 screen Reflection Real Echo Antenna Mast, Echo: Ghost Ghost Echoes Muitiple Echoes When there are vertical reflective surfaces at short range, for instance, when your ship passes a larger ship, the pulsed waves emitted from your radar will bounce back and forth between the two ships (Fig.
  • Page 26 Side-lobe Echoes The beam radiated from a radar antenna is composed of a main beam and side-lobe beams. Since the energy levels of side lobes are usually low, false echoes from the side lobes can be produced by highly reflective targets at short range (Fig.

  • Page 27: Maintenance

    . P r e v e n t i v e maintenance f o r t h e RA771UA r a d a r m u s t be...
  • Page 28 l a i n t e n a n c e P r o c e d u r e Antenna d r i v i n g e v e r y 6 1 2 months p i n i o n - g e a r on a l l s u r f a c e s o f mechanism gear...
  • Page 32 5 . 4 Proper Location for Installation of Radar 5 . 4 . 1 Scanner unit The target detection capabilities of shipboard radars are governed by the location of the Scanner unit. An ideal location would be a point as high as possible above the keel line, where there are no obstacles in all azimuthal directions which might interfere with the transmission of radar pulses and reception of returning...
  • Page 33 Fig. Displacing Scanner Location from Keel Line to Improve, Visibility. in the Bow Direction Making dip angle ( 2 ) The location of the scanner unit must be sufficiently elevated so as to make a dip angle (an angle formed by a horizontal line and a line connecting the antenna the top of the obstacle) of more'than 5", as illustrated.
  • Page 34 Installing Scanner Unit s c a n n e r u n i t mount b a s e must be r i g i d enough t o T h e a v o i d any v i b r a t i o n from e n g i n e . r e a r s i d e cover, and open t h e t h e...

  • Page 35: Display Unit

    5 . 6 I n s t a l l i n g Display Unit The d i s p l a y u n i t i s designed t o b e mounted on a desk. Determine t h e b e s t l o c a t i o n by t a k i n g t h e n a v i g a t i o n a l and s h i p b o a r d o p e r a t i o n s mentioned below i n t o c o n s i d e r a t i o n .
  • Page 36 c a b l e frame s h i p ' s t o s h i p ' s frame 5 . 6 . 3 Adjustments i n s t a l l a t i o n A f t e r completing and c o n n e c t i o n , t u r n on power, s t a r t t h e b a s i c o p e r a t i o n d e s c r i b e d p a r a g r a p h 2 ,...
  • Page 37 S e l e c t t h e " ( 6 ) D I R E C T I O N ADJUSTMENT" by range p r e s s i n g t h e a n d p r e s s t h e b r i l l i a n c e key t o e n t e r t h e u n d e r l i n e d menu.
  • Page 38 Laying Cables The following should be considered when laying cable. Avoid to use staple or strap to assemble multi-conductor cable and power cable. Keep such cables at least 50 cm from cables connected to other radio equipment. Cable runs between the Scanner and the Display Unit must be as short as practicable.

  • Page 42: 6.1.2 Scanner Unit

    SPECIFICATIONS Principal Specification 6.1.1 Overall Characteristics Range 0.125, 0.25, 0.5, 0.75, 6, 12, 24, 1.5, 3, Range discrimination: Better than 20 meters Minimum detection range: Better than 20 meters Bearing accuracy: Within degree Bearing discrimination: Better than 3.0 degree ft antenna) Better than 2.5 degree (4 ft antenna) Range accuracy: Within +/-0.8% of setting range, or +/-8 meters,...
  • Page 43 IF Frequency: (LOG IF AMP. (11) IF Bandwidth: (for (for 0 . 8 (12) Local oscillation frequency: Transmitting frequency Indicated by bar-graph marks on CRT by microcomputer control (14) Inter-connection Cable: Display system: ( 2 ) CRT: 10-inch rectangular monochrome CRT Range scale and range rings: Range 0 .

  • Page 44: (Kg) Antenna

    Raw signal from LOG IF amplifier Max.3 Vp-p, Zo= 50 ohm 10 Vp-p, 1.2 pulse width 50 ohm level pulse 360, or 2048) pulses/revolution 1080 (200, 30 to 70% duty signal: TTL level pulse use Negative edge Compass Interface: 1 Vdc) buzzer NMEA-0183 GLL, XTE, VTG, HDM, BWC..
  • Page 45 Bolt scanner Manuals Key-Cap Spare Parts Fuse 1 set Carbon brushes 6.3 Option AC Power Supply Input Voltage 100/110/220 Vac (2) AC Power Supply 69-1E-A Input Voltage 100-125 (3) NMEA Cable with connector 6.4 DIP Switch Selection MAIN PCB TYPE RADAR OFF RA770UA RADAR / MONITOR MODE...

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