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Operation

850--160139 / A

5.6 AGC (Automatic Gain Control)

This control adjusts the gain in the sonar’s preamplifier

dependent on the strength of the incoming echo signals. The

result is a filter-effect reducing noise and reverberation.

AGC........:

OFF

WEAK

*MEDIUM

STRONG

As shown in the menu, the AGC has four different settings:

OFF - no adjustment

WEAK - slow adjustment

MEDIUM - medium fast adjustment

STRONG - fast adjustment

Note that the AGC is sensing the echo strength in the audio

channel, and use this as a basis for a common adjustment for all

the receiver beams.

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 127 128

Operator manual 1
Fishery sonar 3
Sections 5
References 6
The reader 6
Document logistics 7
Document revisions 10
Table of contents 11
2.1 Introduction 14
System familiarization 15
2.2 Sonar Control Unit 16
2.3 Transceiver Unit 17
Simrad SD570 18
2.4 Hull Unit 19
2.5 Auxiliary equipment 20
3.1 Introduction 21
3.2 Functional principles 21
3.3 FM (Frequency Modulation) 22
3.4 Receiving 23
850--160137 / A 24
4 TECHNICAL SPECIFICATIONS 25
Modes of operation 27
2.1 General 32
2.2 Bow up 33
2.3 North up 34
2.4 True motion 35
2.5 180°/Audio 36
2.6 180°/Echo sounder 37
2.7 180°/Vertical 38
2.8 270°/Vertical 39
2.9 Omni/Vertical 40
850--160138 / A 41
2.10 Omni/Echo sounder 42
1.1 General 49
1.2 The main control panel 50
2 THE MENU SYSTEM 63
3 DISPLAY CONTROLS 65
4.1 Start procedure 66
4.2 Stop procedure 66
5 MENU OPERATION 67
5.1 Mode 69
5.2 Pulse form 70
5.3 Transmission power 72
5.4 Ping sector 73
5.5 TVG (Time Variable Gain) 74
5.8 PP Filter 77
5.9 Markers 78
5.10 Audio sector 79
5.11 Tilt step 80
5.12 Track window 81
(CD3988) 81
5.13 Colour threshold 82
5.14 Display gain 83
5.15 Wind marker 84
5.16 External synchronizing 84
5.17 Cosmetics 85
5.18 Constants 88
LENGTH: 0 M 90
SET NET LENGTH 90
DEPTH: 0 M 90
SET NET DEPTH 90
HEIGHT...M: 0 M 92
SET TRAWL HEIGHT 92
WIDTH....M: 0 M 92
SET TRAWL WIDTH 92
School data 93
MOVEMENT: 0 94
Alignment 96
Language 100
Simrad test 100
5.19 Standard 101
5.20 Test 102
5.21 Course 103
5.22 Speed 104
5.23 Vertical menu 105
850--160139 / A 106
Operation 107
Maintenance 111
Document history 114
1 INTRODUCTION 115
2.1 Cleaning 116
2.2 Dust filter 116
2.3 Replacing fuses 117
3.1 Dust filter 118
3.2 Replacing fuses 118
4.1 General 120
4.2 Docking the vessel 120
4.3 Cleaning the transducer 121
850--160140 / A 122
Figure 4 - The Hull Unit 123
Blank page 124
E 2004 Simrad AS 126
ISBN 82-8066-017-8 126

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