3. ADJUSTMENTS
3-4
In practice, you will probably observe some small bearing error on the display because
of the difficulty in achieving accurate initial positioning of the Antenna Unit. The follow-
ing adjustment will compensate for this error.
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 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 [ECHO ADJUSTMENT] followed by [HD ALIGN].
7. Key in the bearing difference. The setting range is 0° to 359.9° (default: 000.0°).
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 Anten-
na Unit and the Processor Unit. Adjust sweep timing at installation to prevent the fol-
lowing 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 incorrect.
1. Set the GAIN, A/C SEA and A/C RAIN controls shown below.
GAIN: 80
A/C SEA: Fully counterclockwise (OFF)
A/C RAIN: Fully counterclockwise (OFF)
2. Open the [RADAR INSTALLATION] menu, then select [ECHO ADJUSTMENT]
menu.
3. Select [TIMING ADJ VALUE] to set the value for adjustment timing manually. The
setting range is 0000 to 4095. The default settings for each radar are shown be-
low;
• Default for magnetron radar: [325]
• Default for solid state radar: [43]
4. After the adjustment is completed, set the radar to the minimum range. Confirm
that no echoes are "missing" at the center of the radar screen.If echoes are miss-
ing, do step 3 again.
(1) Correct (2) Target pushed
inward
(3) Target pushed
outward
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