Furuno 851 MARK-2 - Manual (Page 13)

2-4
2.7 Adjusting Control Panel
Illumination
Procedure
1. Press the [MENU] key.
2. Press the omnipad at 6 o’clock to
select Backlight/Brilliance and press
the [ENT] key.
3. Press the omnipad at 6 o’clock to
select Panel.
4. Press the omnipad at 3 o’clock/9
o’clock to select illumination level; 4 is
the highest.
5. Press the [ENT] key followed by the
[MENU] key.
2.8 Adjusting GAIN, STC, A.C
RAIN and FTC
General procedure
The [ECHO] key enables adjustment of the
GAIN, STC, A.C RAIN and FTC.
1. Press the [ECHO] key. The following
display appears.
AUTO
MAN
AUTO 1 2 3
01
MAN
GAIN
STC
◆
◆
[
[
00
0 1 2
01
ECHO KEY
TO EXIT
Current level
Item selected
for adjustment
Select auto or
manual by
pressing the
omnipad at
6 o'clock or
12 o'clock and
pressing [ENT]
key.
Select auto or manual by
pressing the omnipad at
6 o'clock or 12 o'clock and
pressing [ENT] key.
FTC
A.C RAIN
Select item/option
by pressing appropriate
omnipad arrow.
Figure 2-4 Display for adjustment of GAIN,
STC, A.C RAIN and FTC
2. Press the omnipad at 6 o’clock/12
o’clock to select item to adjust. Current
selection is circumscribed by dashed
rectangle.
3. Press the [ENT] key.
4. Press the omnipad at 3 o’clock/9
o’clock to set level.
5. Press the [ECHO] key to finish.
How to adjust the GAIN (sensitivity)
The GAIN works in precisely the same
manner as the volume control of a
broadcast receiver, amplifying the signals
received.
You can adjust the GAIN automatically or
manually. If you select AUTO, the GAIN
automatically adjusted. The range of the
GAIN adjustment is from 1 to 3; 3 is the
highest. For manual adjustment, adjust the
sensitivity on the highest range—the
background noise is clearer on that range.
The range of GAIN adjustment is from 01
to 41. The proper setting is such that the
background noise is just visible on the
screen. If you set up for too little GAIN,
weak echoes may be missed.
On the contrary 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.