How To Adjust The Sweep Timing - Furuno FAR-3320W Installation Manual

3. SETTINGS AND ADJUSTMENTS
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 [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 trans-
ceiver 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.
3-2
(1) Correct (2) Target pushed
inward
(3) Target pushed
outward