2. Radar Operation
2-16
2.10 Interference
Rejector
Mutual radar interference may occur in the vicinity of another
shipborne radar operating in the same frequency band as own radar. It is
seen on the screen as a number of bright spikes either in irregular
patterns or in the form of usually curved spoke-like dotted lines
extending from the center to the edge of the picture. Activating the
interference rejector circuit can reduce this type of interference.
The interference rejector is a kind of signal correlation circuit. It
compares the received signals over successive transmissions and
suppresses randomly occurring signals. There are three levels of
interference rejection depending on the number of transmissions that
are correlated.
1. Use the trackball to select the IR indication at the left side of the
screen.
2. Push the left button to select the interference rejection level desired.
The indication changes in the sequence of OFF, 1, 2, and 3. The
higher the value the greater the rejection.
2.11 Measuring the Range
The range to a target may be measured three ways: with the fixed range rings, with the cursor, or with the VRM.
Use the fixed range rings to obtain a rough estimate of the range to a target. They are the concentric solid circles
about own ship, or the sweep origin. The number of rings is automatically determined by the selected range scale
and their interval is displayed at the upper-left position of the screen. Count the number of rings between the center
of the display and the target. Check the range ring interval and judge the distance of the echo from the inner edge of
the nearest ring.
2.11.1 Turning range rings on/off
1. Use the trackball to select the MENU box at the right side of the screen.
2. Push the left button to display the Main menu.
3. Spin the scrollwheel to select Mark then push the scrollwheel.
4. Use the trackball to place the arrow on the setting of Range Rings.
5. Spin the scrollwheel to select OFF or ON as appropriate then push the scrollwheel.
6. Click the Close window button (X) to close the Mark menu.
Interference
rejector
Summary of Contents for FCR-2107 series
Page 42: ...1 Operational Overview 1 20 This page intentionally left blank...
Page 154: ...5 AIS Operation 5 28 This page intentionally left blank...
Page 255: ...7 Vector Chart Material 7 83 Recommended track defined by two beacons...
Page 256: ...7 Vector Chart Material 7 84 Recommended track defined by a building and a beacon...
Page 257: ...7 Vector Chart Material 7 85 Measurement mile tails tails...
Page 298: ...9 Chart Alerts 9 14 This page intentionally left blank...
Page 322: ...10 Route Planning 10 24 This page intentionally left blank...
Page 368: ...14 Backup Operations 14 6 This page intentionally left blank...
Page 404: ...16 Recording Functions 16 16 This page intentionally left blank...
Page 406: ...17 NAVTEX Messages 17 2 This page intentionally left blank...
Page 416: ...19 Parameters Setup 19 8 This page intentionally left blank...
Page 457: ...Appendix 2 IHO ECDIS Chart 1 AP 5 Nature and Man made features Port features...
Page 458: ...Appendix 2 IHO ECDIS Chart 1 AP 6 Depths Currents etc Seabed Obstructions Pipelines etc...
Page 459: ...Appendix 2 IHO ECDIS Chart 1 AP 7 Traffic routes Special areas...
Page 460: ...Appendix 2 IHO ECDIS Chart 1 AP 8 Aids and Services Buoys and Beacons...
Page 461: ...Appendix 2 IHO ECDIS Chart 1 AP 9 Topmarks Color test diagram...
Page 462: ...Appendix 2 IHO ECDIS Chart 1 AP 10 Mariners navigational symbols...
Page 469: ...Appendix 3 Interpreting S57 Charts AP 17 Fog signals Radars Services...
Page 476: ...Appendix 3 Interpreting S57 Charts AP 24 This page intentionally left blank...
Page 511: ...Appendix 5 Digital Interface AP 59 NRX NAVTEX received data...
Page 544: ...Appendix 6 Parts List and Parts Location AP 92 This page intentionally left blank...
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