2. Radar Operation
2-12
2.6
Choosing the Range Scale
The selected range scale, range ring interval and pulse length are shown at the upper left corner on the screen. When
a target of interest comes closer, reduce the range scale so that it appears in 50-90% of the display radius.
From the control unit w/keyboard
Use the
RANGE
key to select range desired. Hit the "+" part of the key to raise the range; the "-" part to lower the
range.
By trackball
1.
Use the trackball to select the RANGE box at the top left corner of the screen. The guidance area shows
"RANGE - / OK / RANGE +".
2. Push the left button to lower the range; the right button to raise the range. You can also select the range by
spinning the scrollwheel then pushing it.
2.7 Adjusting
the
Sensitivity
The gain control adjusts the sensitivity of the receiver. The proper setting is such that the background noise is just
visible on the screen. If you set up for too little sensitivity, weak echoes may be missed. On the other hand excessive
sensitivity yields too much background noise; strong targets may be missed because of the poor contrast between
desired echoes and the background noise on the display.
Adjust the gain so background noise is just visible on the screen.
From the control unit w/keyboard
While monitoring the radar image, operate the
GAIN
control to adjust the sensitivity.
By trackball
1. Use the trackball to place the arrow on the gain level indicator at the top of the screen.
Gain level
Put arrow inside box
to adjust gain.
67
Gain
2. Spin the scrollwheel downward to increase the gain or upward to decrease it. 100 levels (0-100) are available.
2.8
Suppressing Sea Clutter
Echoes from waves cover the central part of the display with random signals known as sea clutter. The higher the
waves, and the higher the antenna above the water, the further the clutter will extend. When sea clutter masks the
picture, suppress it with the A/C SEA control, either manually or automatically.
When both sea clutter and rain clutter are reduced, the sensitivity is decreased more than when only one is adjusted.
For that reason adjust them carefully.
The echo average is useful for reducing reflections from the sea surface. However, high-speed targets are harder to
detect than stationary ones when the echo average is active.
Содержание FCR-2107 series
Страница 42: ...1 Operational Overview 1 20 This page intentionally left blank...
Страница 73: ...2 Radar Operation 2 31 ROUGH SEA SHIP HARBOR COAST Picture setup options and default settings con t...
Страница 154: ...5 AIS Operation 5 28 This page intentionally left blank...
Страница 253: ...7 Vector Chart Material 7 81 More information is available in text More information is available as a picture...
Страница 255: ...7 Vector Chart Material 7 83 Recommended track defined by two beacons...
Страница 256: ...7 Vector Chart Material 7 84 Recommended track defined by a building and a beacon...
Страница 257: ...7 Vector Chart Material 7 85 Measurement mile tails tails...
Страница 279: ...8 Manual Updates 8 19 12 10 11 9 13 7 8 Set positions with cursor and push left mouse button Click Accept button...
Страница 298: ...9 Chart Alerts 9 14 This page intentionally left blank...
Страница 322: ...10 Route Planning 10 24 This page intentionally left blank...
Страница 368: ...14 Backup Operations 14 6 This page intentionally left blank...
Страница 404: ...16 Recording Functions 16 16 This page intentionally left blank...
Страница 406: ...17 NAVTEX Messages 17 2 This page intentionally left blank...
Страница 416: ...19 Parameters Setup 19 8 This page intentionally left blank...
Страница 456: ...Appendix 2 IHO ECDIS Chart 1 AP 4 Information about the chart display 1 Information about the chart display 2...
Страница 457: ...Appendix 2 IHO ECDIS Chart 1 AP 5 Nature and Man made features Port features...
Страница 458: ...Appendix 2 IHO ECDIS Chart 1 AP 6 Depths Currents etc Seabed Obstructions Pipelines etc...
Страница 459: ...Appendix 2 IHO ECDIS Chart 1 AP 7 Traffic routes Special areas...
Страница 460: ...Appendix 2 IHO ECDIS Chart 1 AP 8 Aids and Services Buoys and Beacons...
Страница 461: ...Appendix 2 IHO ECDIS Chart 1 AP 9 Topmarks Color test diagram...
Страница 462: ...Appendix 2 IHO ECDIS Chart 1 AP 10 Mariners navigational symbols...
Страница 464: ...Appendix 3 Interpreting S57 Charts AP 12 Plain or symbolized boundaries Limited or full light sectors...
Страница 467: ...Appendix 3 Interpreting S57 Charts AP 15 Land features Water and seabed features Traffic routes...
Страница 468: ...Appendix 3 Interpreting S57 Charts AP 16 Cautionary areas Information areas Buoys and beacons Lights...
Страница 469: ...Appendix 3 Interpreting S57 Charts AP 17 Fog signals Radars Services...
Страница 472: ...Appendix 3 Interpreting S57 Charts AP 20 Low accuracy Services and small craft facilities Special areas...
Страница 474: ...Appendix 3 Interpreting S57 Charts AP 22 Light descriptions Nature of seabed Geographic names etc...
Страница 476: ...Appendix 3 Interpreting S57 Charts AP 24 This page intentionally left blank...
Страница 511: ...Appendix 5 Digital Interface AP 59 NRX NAVTEX received data...
Страница 544: ...Appendix 6 Parts List and Parts Location AP 92 This page intentionally left blank...
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