Furuno FR1500 Mk3 User Manual Page 76
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- TROUBLESHOOTING
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-3.1-
3 RADAR OBSERVATION
3.1 General
Minimum range
The minimum range is defined by the shortest distance at which, using a scale of 1.5 or 0.75 nm, a
target having an echoing area of 10 m
2
is still shown separate from the point representing the
scanner position.
It is mainly dependent on the pulselength, scanner height, and signal processing such as main bang
suppression and digital quantization. It is a good practice to use a shorter range scale as far as it
gives favorable definition or clarity of picture. The IMO Resolution A. 477 (XII) and IEC 936 require
the minimum range to be less than 50 m. All FURUNO radars satisfy this requirement.
Maximum range
The maximum detecting range of the radar, Rmax, varies considerably depending on several
factors such as the height of the scanner above the waterline, the height of the target above the sea,
the size, shape and material of the target, and the atmospheric conditions.
Under normal atmospheric conditions, the maximum range is equal to the radar horizon or a little
shorter. The radar horizon is longer than the optical one by about 6% because of the diffraction
property of the radar signal. The Rmax is given in the following equation.
R
max
= 2.2 x ( h1 + h2
)
where Rmax: radar horizon (nautical miles)
h1: scanner height (m)
h2: target height (m)
Radar horizon
Optical horizon
For example, if the height of the scanner above the waterline is 9 meters and the height of the target
is 16 meters, the maximum radar range is;
R
max
= 2.2 x ( 9 + 16
) = 2.2 x (3 + 4) = 15.4 nm
It should be noted that the detection range is reduced by precipitation (which absorbs the radar
signal).
X-band and S-band
In fair weather, the above equation does not give a significant difference between X- and S-band
radars. However, in heavy precipitation condition, an S-band radar would have better detection than
an X-band radar.
Radar resolution
There are two important factors in radar resolution (discrimination): bearing resolution and range
resolution.
- SHIPBORNE RADAR AND ARPA 1
- *00080840400**00080840400* 2
- *OME34500T00**OME34500T00* 2
- SAFETY INSTRUCTIONS 3
- TABLE OF CONTENTS 5
- INTRODUCTION 7
- •1 menu are not accessible 9
- ANTENNA RADIATORS 10
- RF TRANSCEIVER 10
- DISPLAY UNIT 10
- INTERFACE 10
- POWER SUPPLY 10
- 1 OPERATIONAL OVERVIEW 13
- Video Freeze-up Recovery 13
- 1.3 Control Description 14
- 1.4 CRT Brilliance 15
- 1.6 Tuning the Receiver 15
- 1.7 Degaussing the Screen 16
- 1.9.2 Manual speed input 17
- PULSE 1 M1 18
- H U RM 18
- 1.11 Presentation Modes 19
- 1.15 Suppressing Sea Clutter 23
- 1.17 Interference Rejector 24
- 1.18 Measuring the Range 25
- 1.19 Measuring Bearing 26
- 1.22.1 Introduction 29
- 1.23 Off-centering (shift) 30
- 1.24 Echo Averaging 31
- 1.25.1 Plotting a target 33
- 1.25.2 Cancelling 34
- 1.25.3 Vectors 34
- CPA/TCPA 35
- 1.25.8 Past plot points 36
- 1.26.2 Trail gradation 37
- 1.26.4 Thin trails 37
- 1.26.5 Restoring trails 38
- 1.27 Parallel Index Lines 39
- 1.30 Markers 41
- 1.32 [F1] Key 42
- 1.33 [F2] Key 43
- 1.34 FUNCTION Key 44
- -1.34 46
- 1.36.1 Echo stretch 47
- 1.36.2 Contrast 47
- 1.37 Watch Timer 48
- 1.38 Noise Rejector 49
- 1.39 Navigation Data 49
- 1.42 Degaussing Interval 50
- 1.43 Background Color 50
- 1.44 Clutter Sweep 50
- 1.45 Day, Night Brilliance 51
- 1.46 Contrast 51
- 1.47.1 Preparation 52
- 1.48 Alarms 56
- 1.51 Echo Area (R-type only) 59
- 2.1 Introduction 60
- 2.2 Criteria of Tracking 61
- Own ship maneuvers 62
- Other ship maneuvers 62
- 2.5 Acquiring Targets 65
- - TARGET SWAP 66
- 2.5.2 Automatic acquisition 66
- 2.6.1 Individual targets 67
- 2.6.2 All targets 67
- 2.7.1 Vector time 68
- 2.7.2 Vector start time 68
- 2.9 Past Position Display 69
- 2.10 Set and Drift 69
- 2.11 Alarms 70
- 2.11.3 Guard zone alarm 71
- 2.13 Outputting Target Data 72
- 2.14 Diagnostic Sequence 73
- Sea returns 74
- Indirect echoes 75
- 3 RADAR OBSERVATION 76
- Bearing accuracy 77
- Range measurement 77
- 3.2 False Echoes 78
- Screen A: When SART 79
- is distant 79
- Screen B: When SART 79
- is close 79
- 3.4 RACON (Radar Beacon) 81
- 5 MAINTENANCE 83
- 5.3 Replacement of Batteries 84
- 6 TROUBLESHOOTING 85
- Serviceman qualification 86
- Service call 86
- (Continued on next page) 87
- 6.3 Diagnostic Test 90
- 6.4 Menu Hierarchy 92
- [MENU] key + 93
- 7 OPTIONAL EQUIPMENT 95
- 9 nm 9 nm 96
- Description of Sentences 99
- * Not used 102
- *: Not used 103
- T = tracking 106
- Figure A-5 Scanner unit 110
- Figure A-6 RF module 111
- MD Board 112
- 9.2 Circuit diagrams 113
- CHANNEL 2 OUTPUT 114
- 9.3 Parts list 116
- 2 FR-1505/1515/1525 MARK-3 117
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