4-7
4 Operations
4
4.1.5 Transmission pulse repetition rate
If there are many ships around, you may receive interference from other sonars or fish finders that are
using the same frequency as you.
In addition, if you are using a short range setting, the previous transmission image may, on rare occasions,
appear on the screen. This may be improved by changing the transmission pulse repetition rate.
Example: Image of interference
Example: False echo image of the sea floor in shallow waters
Ring shaped interference wave from
other ships
Example of changing the transmission pulse
repetition rate so it does not appear in the image
If the sea floor is at 800 m, it appears in
the image if the range is set to 1000 m.
Images that do not appear at a 500 m
range appear at a 1000 m range.
Image of shallow
sea floor
An image appears where there
is actually no image. [FALSE]
Slowing the transmission pulse repetition
rate eliminates the false echo.
Содержание JFS-280
Страница 2: ......
Страница 3: ...A General Information Before you begin 7ZPNA2401...
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Страница 38: ...1 Overview of the equipment 1 2 1...
Страница 43: ...1 7 1 Overview of the equipment 1 Diagram 1 1 Exterior view of the NWZ 207 display unit...
Страница 44: ...1 Overview of the equipment 1 8 1 Diagram 1 2 Exterior view of the NCH 578 keyboard...
Страница 47: ...1 11 1 Overview of the equipment 1 Diagram 1 5 Exterior view of the NKF 2800 hoisting device...
Страница 50: ...2 Names and Functions of Parts 2 2 2...
Страница 55: ...2 7 2 Names and Functions of Parts 2 Names and Functions of the Keyboard 2 2 Diagram 2 Controls...
Страница 64: ...3 Operating procedures 3 2 3 TRACK LINE 3 26 3 3 8 Sonar range setting 3 26 3 3 9 Stabilize 3 27 3 3 10...
Страница 90: ...3 Operating procedures 3 28 3...
Страница 148: ...5 Adjusting How Images Appear 5 34 5...
Страница 267: ...7 33 7 Other Items 7...
Страница 274: ...7 Other Items 7 40 7 7 6 2 Test Ring Number 7 6 3 Reservation Settings...
Страница 282: ...8 Maintenance and inspections 8 2 8...
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Страница 290: ...9 Malfunctions and after sales service 9 2 9...
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Страница 296: ...10 Disposal 10 2 10...
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Страница 300: ...11 Specifications 11 2 11...
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Страница 308: ...12 Other 12 2 12...
Страница 309: ...12 3 12 Other 12 12 1 List of Menus...
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Страница 320: ...12 Other 12 14 12 12 2 Setting the Colors of the Sonar Display...
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Страница 322: ...12 Other 12 16 12 12 3 Setting the Colors of the Fish Finder Display...
Страница 323: ...12 17 12 Other 12 12 4 Sonar Range and Initial Setting Values for the Fish Finder Range...
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