Furuno FR-8122, FR-8252, FR-8062 Adjusting the Gain sensitivity, Choosing gain adjustment method

1. OPERATIONAL OVERVIEW

1.10Adjusting the Gain (sensitivity)

The gain functions to adjust the receiver sensitivity for the best reception of signals of widely varying amplitudes.

1.10.1Choosing gain adjustment method

Gain may be adjusted automatically or manually. Push the GAIN control to choose automatic or manual adjustment alternately. The adjustment method currently chosen is show at the top right corner of the screen. In the example below the gain adjustment method is “AUTO”.

TUNE AUTO

Gain adjustment method (AUTO) GAIN AUTO

SEA AUTO

RAIN AUTO

Gain adjustment method indicator

1.10.2Setting automatic gain level

1.Press the MENU key to open the menu.

2.Choose the Echo menu and press the ENTER key.

3.Choose Auto Gain and press the ENTER key.

Rough

Moderate

Calm

4.Choose the option which best matches current sea condition and press the ENTER key.

5.Press the MENU key to close the menu. Gain is automatically adjusted according to the level selected.

1.10.3Manual gain adjustment

Adjust the gain such that noise faintly appears over the entire screen. If the gain is too low weak echoes will not be displayed and if the gain is too high, weak echoes will be hidden in background noise.

1.Push the GAIN control to show “GAIN MAN” as the gain adjustment method.

2.Rotate the GAIN control to adjust the gain. Adjust the control so background noise is just visible on the screen.

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