Furuno FCR-2139S-BB, Руководство по установке

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3. SETTING AND ADJUSTMENT
3-2
3. Read the target bearing.
4. Measure the bearing of the stationary target on a navigation chart and calculate
the difference between the actual bearing and apparent bearing on the radar
screen.
5. Show the [RADAR INSTALLATION] menu.
6. Select [1 ECHO ADJ] followed by [2 HD ALIGN].
7. Key in the bearing difference. The setting range is 0° to 359.9°.
8. Confirm that the target echo is displayed at the correct bearing on the screen.
3.3 How to Adjust the Sweep Timing
Sweep timing differs with respect to the length of the signal cable between the antenna
unit and the processor unit. Adjust sweep timing at installation to prevent the following
symptoms:
• The echo of a "straight" target (for example, pier), on the 0.25 NM range, appears
on the display as being pulled inward or pushed outward. See the figure below.
• The range of target echoes is also be incorrectly shown.
1. Transmit on the 0.25 NM range.
2. Adjust the radar picture controls to display the picture properly.
3. Select a target echo which should be displayed straightly.
4. Show the [RADAR INSTALLATION] menu, then select [1 ECHO ADJ] followed by
[3 TIMING ADJ].
5. Set a value which displays the target straightly. The setting range is 0 to 4095.
3.4 How to Suppress Main Bang
Main bang is the clutter at the center of the screen that you typically see on the radar
display, and it may mask close-in targets. If main bang appears at the screen center,
suppress it as follows.
1. Transmit the radar on a long range and then wait ten minutes.
2. Adjust the gain to show a slight amount of noise on the display.
3. Select the 0.25 NM range, and turn off the
A/C SEA control.
4. Show the [RADAR INSTALLATION] menu, then select [1 ECHO ADJ] followed by
[4 MBS].
5. Set a value that causes the main bang to just disappear. The setting range is 0 to
255.
(1) Correct
(2) Target pushed inward
(3) Target pushed outward