Furuno 2137S, Installation Manual

Page: 46 / 123

3. SETTING AND ADJUSTMENT
3-6
3.4 Adjustment 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 m range, will appear on the
display as being pulled inward or pushed outward. See Figure below.
•
The range of target echoes will also be incorrectly shown.
(1) Correct (2) Target pushed (3) Target pushed
inward outward
Examples of correct and incorrect sweep timings
1. Transmit on the 0.25 nm range.
2. Adjust radar picture controls to display picture properly.
3. Select a target echo which should be displayed straightly.
4. Press [4] key to choose the [TIMMING ADJ] on the [ECHO ADJ] menu.
[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
5. Rotate the wheel to set a suitable value which causes the target to be displayed
straightly. The setting range is 0 to 4095.
6. Press the [MENU] key to finish.