Furuno 1944C-BB, GD-1920C-BB manual Adjusting the Gain, Tuning window, Gain sensitivity window

2. RADAR OPERATION

2.3Tuning

The radar receiver can be tuned automatically or manually, and the default tuning method is automatic. If you require manual tuning, do the following:

1.Press the MENU key to display the main menu.

2.Press the A: RADAR DISPLAY SETUP soft key.

3.Select TUNING, then press the A: EDIT soft key.

TUNING

AUTO

MAN Tuning bar

Tuning window

4.Choose MAN.

5.Adjust the ENTER knob until the tuning bar is at its longest position.

6.Press the MENU key to close the menu.

Note: If the auto setting does not provide satisfactory tuning, ask your dealer how to re-adjust tuning.

2.4Adjusting the Gain

The GAIN key adjusts the gain sensitivity of the radar receiver. It works in a manner similar to that of volume control of a broadcast receiver, which amplifies received signals.

The proper setting is such that the background noise is just visible on the screen. If your gain setting is too low, weak echoes may be missed. On the other hand, excessive gain yields too much background noise; strong targets may be missed because of the poor contrast between desired echoes and the background noise on the display.

To adjust the receiver sensitivity, transmit on long range, and then do the following:

1.	Press the GAIN key to show the “gain adjustment”
	soft keys, and the last-used adjustment window	GAIN SENSITIVITY
	appears. The example below shows the gain	AUTO ROUGH
	sensitivity adjustment window. The gain soft keys
		AUTO MODERATE
	shown depend on radar source as shown below.	AUTO CALM
2.	If the gain sensitivity window is not displayed, press	MAN	0
	the A: GAIN soft key to show the gain sensitivity
	setting window.	Gain sensitivity window
3.	Use the Trackball to select AUTO ROUGH, AUTO
	MODERATE, AUTO CALM, or MAN (manual) as
	appropriate. Select an AUTO option according to the sea state.
4.	For manual adjustment, rotate the ENTER knob to adjust, while observing the radar
	echo. The range of adjustment is 0-100.
5.	Press the GAIN key on the front panel or the E: RETURN soft key to finish.

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