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3. SETTING AND ADJUSTMENT
3-2
1. Select a stationary target echo at a range between 0.125 and 0.25 nm, preferably
near the heading line.
2. Operate the EBL control to bisect the target echo.
3. Read the target bearing.
4. Measure the bering of the stationary target on the navigation chart and calculate
the difference between actual bearing and apparent bearing on the radar screen.
5. Show the [RADAR INSTALLATION] menu.
6. Select [1 ECHO ADJ] and [2 HD ALIGN] in that order.
7. Key in the bearing difference. The setting range is 0 to 359.9°
8. Confirm that the target echo is displayed at correct bearing on the screen.
3.1.3 Adjustment 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 m range, will appear
on the display as being pulled inward or pushed outward. See Figure below.
• The range of target echoes will also be incorrectly shown.
1. Transmit on the 0.25 nm range.
2. Adjust radar picture controls to display picture property.
3. Select a target echo which should be displayed straightly.
4. Show the [RADAR INSTALLATION] menu, then select [1 ECHO ADJ] and [3 TIM-
ING ADJ] in that order.
5. Set a suitable value which causes the target to be displayed straightly. The setting
range is 0 to 4095.
3.1.4 Suppressing main bang
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 gain to show a slight amount of noise on the display.
3. Select the 0.25 nm range. Suppress sea clutter.
4. Show the [RADAR INSTALLATION] menu, then select [1 ECHO ADJ] and [4
MBS] in that order.
5. Set a suitable value so that the main bang disappears. The setting range is 0 to
255.
(1) Correct (2) Target pushed
inward
(3) Target pushed
outward