Furuno FAR-2157-BB Adjusting Sweep Timing, Examples of correct and incorrect sweep timings

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.

(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 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]

1BACK

2CABLE ATT ADJ AUTO/MANUAL 30

3HD ALIGN 000.0°

4TIMING ADJ

0

5MBS 0

6DEFAULT ANT HEIGHT 5/7.5/10/15/20/ 25/30/35/40/45/ more 50 m

7NEAR STC CURVE 2/2.5/3/3.5/4.2

8MID STC CURVE

3/4/5/6

9FAR STC CURVE 6/7/8

0RING SUPPRESSION 0

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.

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