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Furuno 821, 841 PUB. No. OME-34160 , , A, FIRST EDITION : , UG. 1995 G : JAN. 11, 2001

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PUB. No. OME-34160

MODEL 821/841

(

YOSH

)

FIRST EDITION :

UG. 1995 G : JAN. 11, 2001

Printed in Japan

Contents

Main PUB. No. OME-34160 A FIRST EDITION : UG. 1995 G : JAN. 11, 2001 i TABLE OF CONTENTS 2. OPERATION 3. INTERPRETING THE DISPLAY 4. MAINTENANCE & TROUBLESHOOTING 5. INSTALLATION FOREWORD Features SPECIFICATIONS MODEL 821 Antenna Unit Transceiver Module (contained in radome) Display Unit SPECIFICATIONS MODEL 841 Antenna Unit Transceiver Module (contained in radome) Display Unit Interface NMEA (MODEL 821/841) Page viii CONFIGURATION OF MODEL 821/841 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 2 Figure 1-1 How radar works 3 2. OPERATION Figure 2-1 Control panel 2.1 Control Description 4 2.2 Display Indications and Markers } 308.7 0.646 220.9 0.675 2.4 Transmitting 2.5 Selecting the Range 2.6 Adjusting LCD Backlighting and Display Tone 2.7 Adjusting Control Panel Brilliance 2.8 Adjusting GAIN, STC, A/C RAIN and FTC [ [ 12 2.9 Tuning the Receiver 1.5 2.11 Measuring the Bearing 2.10 Measuring the Range 2.12 Menu Operation . . . . . . . . . . . . . . . . . 10 Table 1-1 Menu description * Default settings shown in boldface. 2.13 Selecting the Display Mode 2.14 The Window Display 2.15 Selecting the Presentation Mode 2.16 Guard Alarm CAUTION 2.17 Suppressing Radar Interference 2.18 Suppressing Noise Interference 2.19 Selecting Pulselength 2.20 Off Centering the Display 2.21 Echo Trails 2.22 The Navigation Data Display . . . . . . . . . . . . . . . . . 2.23 Echo Stretch (magnifying long range echoes) 2.24 Selecting Unit of Measurement for Range 2.25 Selecting Bearing Reference 2.26 Watchman 2.27 Erasing the Heading Marker 2.28 Deselecting Ranges CAUTION Page 3.2 Target Properties and Radar Wave Reflection 3. INTERPRETING THE DISPLAY 3.1 The Radar Wave and Radar Horizon 3.3 Range Resolution 3.4 Bearing Resolution 3.5 False Echoes Page 3.6 Nautical Chart and Radar Picture 4. MAINTENANCE & TROUBLESHOOTING 4.1 Safety Information 4.2 Preventative Maintenance 4.3 Replacing the Fuse 4.4 Troubleshooting 4.5 Self Test 5. INSTALLATION 5.1 Antenna Unit Installation NOTICE Page Page Ship's bow Page Page Page 5.2 Display Unit Installation 37 4 - 6 FIXING HOLES Figure 5-13 How to mount the display unit * :SERVICING CLEARANCE 10mm 222(8.7") CAUTION Page 5.3 Installation Check List CAUTION GAIN 5.4 Initial Adjustment of Picture STC [ [ 12 5.5 Displaying the Installation Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6 Entering Initial Settings 5.7 Relative Bearing Alignment . . . . . . . . . . . . . . . . . 5.8 Sweep Timing 5.9 Closing the Installation Menus 5.10 Signal cable connection