Furuno CH-250 manual Adjusting the Picture, Suppressing bottom and surface reflections

2.11 Adjusting the Picture

2.11.1 Suppressing bottom and surface reflections

In shallow fishing grounds, excessive sea surface and bottom reflections often interfere with wanted fish echoes and they cannot be eliminated sufficiently with the TVG controls. In such cases, try to reduce the output power, without turning down the gain. The picture becomes clearer when output power is reduces rather than when the gain is decreased.

1.Press the [MENU] key to open the menu.

2.Press to select MENU and then press to select the COM1 menu.

MENU	COM1	COM2 HORZ VERT ES PRESET SYS
TX POWER	MAX
PULSELENGTH	LONG
TX RATE	10
INT REJECT	OFF
AGC	OFF
AUDIO LEVEL	0

: SELECT : CHANGE MENU: END

Figure 2-13 COM1 menu

3. Press or to select TX POWER and press . The following dialog box appears.

TX POWER

MAX

MIN

4.Press to select MIN. (For long range detection be sure to return the setting to MAX.)

5.Press the [MENU] key to register your selection and close the menu.

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