How To Adjust Sweep Timing; How To Suppress Main Bang - Furuno FAR-1513 Installation Manual

3. ADJUSTMENTS
3.5

How to Adjust 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, will appear
on the display as being pulled inward or pushed outward. See the figures below.
(1) Correct
• The range of target echoes is incorrect.
1. Set the GAIN, A/C SEA and A/C RAIN controls as shown below.
GAIN: 80
A/C SEA: Fully counterclockwise (OFF)
A/C RAIN: Fully counterclockwise (OFF)
2. Open the [RADAR INSTALLATION] menu, then open the [ECHO ADJUST] menu.
3. Set [TIMING ADJ] to [AUTO] to activate the automatic adjustment, which takes
approx. two minutes.
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 missing, set [TIMING ADJ] to [MAN]. Select [TIMING ADJ VALUE],
then use the Setting knob to adjust the timing manually.
3.6

How to Suppress Main Bang

If main bang appears (a red ring at the screen center), suppress it as follows.
1. Transmit the radar on a long range and then wait 10 minutes.
2. Adjust the gain to show a slight amount of noise on the display.
3. Select the 0.125 NM range, then adjust the A/C SEA and A/C RAIN controls.
4. Go to the [RADAR INSTALLATION] menu, then open the [ECHO ADJUST] menu.
5. Select [MBS LEVEL], then use the Setting knob to enter a value that causes the
main bang to faintly disappear. The setting range is 0 to 255.
3-4
(2) Target pushed inward (3) Target pushed outward