Furuno CH-300 - Manual (Page 39)

2. HORIZONTAL MODE
2-13
2.12 Adjusting the Picture
2.12.1 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.
Maximum TX power Minimum TX power
Sonar image and TX power setting
1. Press the MENU key to open the menu.
2. Press ▲ to choose MENU and then press ◄ to choose the COM1 menu.
TX POWER MAX
PULSELENGTH LONG
TX RATE 10
INT REJECT OFF
AGC OFF
: SELECT : CHANGE MENU: END
MENU COM1 HORZ VERT ES PRESET SYS COM2
AUDIO LEVEL 0
COM1 menu
3. Press ▲ to choose TX POWER and then press ►. The following dialog box appears.
TX POWER
MAX MIN
4. Press ► to choose 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.