Furuno FAR-2157, Installation Manual

Page: 47 / 111

3-5
3.3 Adjusting 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 to prevent the following symptoms:
• The echo of a "straight" target (for example, pier), on the 0.25 m range, will appear on the dis-
play as being pulled inward or pushed outward. See the figure below.
• The range of target echoes will also be incorrectly shown.
Examples of correct and incorrect sweep timings
1. Transmit on the 0.25 nm range.
2. Adjust the radar picture controls to display picture properly.
3. Select a target echo which should be displayed straightly.
4. On the ECHO ADJ menu, choose 4 TIMING ADJ.
ECHO ADJ menu
5. Spin the thumbwheel to set a suitable value which causes the target to be displayed straightly.
The setting range is 0 to 4095.
6. Left-click the MENU box to finish.
Note: The sweep timing of an external radar can be adjusted from this radar. Do steps 1-5 on page
3-4 and then do the procedure on this page.
(1) Correct (2) Target pushed (3) Target pushed
inward outward
[ECHO ADJ]
1 BACK
2 CABLE ATT ADJ
AUTO/MANUAL
30
3 HD ALIGN
000.0
°
4 TIMING ADJ
0
5 MBS
0
6 DEFAULT ANT HEIGHT
5/7.5/10/
15
/20/
25/30/35/40/45/
more 50 m
7 NEAR STC CURVE
2/2.5/
3
/3.5/4.2
8 MID STC CURVE
3/
4
/5/6
9 FAR STC CURVE
6/
7
/8
0 RING SUPPRESSION
0