Adjusting The Picture; Suppressing Bottom And Surface Reflections - Furuno CH-250 Operator's Manual

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 reduced rather than when the gain is decreased.
1. Press the [MENU] key to open the menu.
2. Press to select MENU and then press
MENU
WHITE MARKER
SIG LEVEL
COLOR
BKGD COLOR
TX POWER
PULSELENGTH
TX RATE
INT REJECT
TRACK
: SELECT
3. Press or to select TX POWER and press
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.
2-12
to select the COMN menu.
COMN HORZ VERT ES PRESET SYS
OFF
OFF
16
1
HIGH
LONG
10
OFF
ON
: CHANGE MENU: END
Figure 2-13 COMMON menu
. The following dialog box appears.