Furuno CH-300 - Manual (Page 23)

1. OPERATIONAL OVERVIEW
1-13
1.9 Adjusting the Gain
The GAIN control adjusts the sensitivity of the receiver. Normally, the control is adjusted so
that the bottom echo is displayed in reddish-brown mixed with red. Initially set the gain
between “4” and “6” and then fine tune according to fishing ground, etc.
Too Low Proper Too High
How to adjust the gain
Single-frequency or combination display
When using both high and low frequency in the horizontal/vertical scan display, refer to the
procedure on the next page.
1. Push the GAIN control.
HIGH FREQ GAIN: 5.0 (0-10)
2. Turn the GAIN control to adjust the gain (range: 0-10).
GAIN 5.3 Gain setting
Location of gain setting indication
3. Press the MENU key to close the gain setting window. Note that it is not necessary to
press the MENU key – the window will automatically if no operation is detected for four
seconds.
Note 1:
Step 1 is not necessary if the menu item GAIN SETTING PROTECT (SYSTEM
SETTING 2 menu) is set for OFF.
Note 2:
You can switch control between the main and sub windows in the horizontal/vertical
scan display with the MAIN/SUB key.