3.5 Adjusting Sweep Timing
Sweep timing differs with respect to the length of the signal cable between the scanner unit and the display 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, will appear on the display as being pulled inward or pushed outward. See Figure
•The range of target echoes will also be incorrectly shown.
(1) Correct | (2) Target pushed | (3) Target pushed |
| inward | outward |
Figure 3-3 Examples of correct and incorrect sweep timings
1.Turn on the power. Press [RADAR MENU] [0] [0] [0] [2] [3] to select TIMING ADJ on the INITIAL SETTING1 menu.
2.Transmit on the 0.25 nm range.
3.Adjust radar picture controls to display picture properly.
4.Select a target echo which should be displayed straightly.
5.Adjust the VRM control to straighten the target echo.
6.Press [ENTER].
3.6Suppressing Main Bang
If main bang appears at the screen center, suppress it as follows.
1.Turn on the power. Transmit on a long range and then wait ten minutes.
2.Adjust [GAIN] control to show a slight amount of noise on the display.
3.Select the 0.25 nm range. Adjust the [A/C SEA] control to suppress sea clut- ter.
4.Press [RADAR MENU] [0] [0] [0] [2] to open the INITIAL SETTING1 menu.
5.Press [7] to select 7. MBS.
6.Adjust the VRM control to adjust timing; the EBL control to adjust level.
7.Press [ENTER].