Furuno GP-1640F, Руководство оператора, Страница: 77 / 108

11-9
E/S WINDOW
Selects the width of the sounder display.
RANGE SETUP soft key
Ranges, zoom range and bottom-lock range
are preset at factory and are suitable for most
fishing conditions. However, you may change
them as follows to suit your needs.
1. Press the [MENU] key.
2. Press the SOUNDER SETUP OPTINS,
RANGE SETUP soft keys.
GPS 3D
RANGE
SETUP
EDIT
RANGE1
RANGE2
RANGE3
RANGE4
RANGE5
RANGE6
RANGE7
RANGE8
ZOOM RANGE
B/L RANGE 15 ft
30 ft
60 ft
120 ft
200 ft
400 ft
1000 ft
2500 ft
30 ft
20 ft
RETURN
s
Range setup menu
3. Select a range, ZOOM RANGE or B/L
RANGE, and press the EDIT soft key.
ZOOM RANGE selects the range to zoom
in the marker and bottom zoom modes.
The setting range is 7 to 5000 feet, and the
default setting is 30 feet. B/L RANGE sets
the expansion width for the bottom-lock
display, 10 or 20 feet. The default setting is
20 feet.
4. Adjust the range with the cursor pad.
5. Press the RETURN soft key to go to back
to the RANGE SETUP menu.
SYSTEM SETUP soft key
The system setup menu provides functions for
selection of fish alarm sensitively, TX power
selection, TVG adjustment, echo level offset
and seabed echo offset.
1. Press the [MENU] key.
2. Press the SOUNDER SETUP OPTIONS,
SYSTEM SETUP soft keys.
GPS 3D
SYSTEM
SETUP
EDIT
FISH ALM LVL
TX POWER
TVG 200kHz
TVG 50kHz
ECHO OFFSET 200kHz
ECHO OFFSET 50kHz
SEABED LVL 200kHz
SEABED LVL 50kHz NORMAL
ON
5
5
+00
+00
80
80
RETURN
System setup menu
SYSTEM SETUP menu description
FISH ALM LVL:
Sets the fish alarm sensitivity;
namely, which echo strength will trigger the
alarm. HIGH, only the strongest echoes trigger
the alarm; NORMAL, echoes from strong to
medium strength trigger the alarm, LOW, any
echo triggers the alarm.
TX POWER:
Turns TX power on/off.
TVG 200 kHz, TVG 50 kHz:
TVG (Time varied
Gain) compensates for propagation attenuation
of the ultrasonic waves. It does this by
equalizing echo presentation so that fish
schools of the same size appear in the same
density in both shallow and deep waters. In
addition, it reduces surface noise. Note that if
the TVG level is set too high short range
echoes may not be displayed.
ECHO OFF SET 200 kHz, ECHO OFFSET 50
kHz:
If the on-screen echo level appears to be
too weak or too strong and the level cannot be
adjusted satisfactorily with the gain control,
adjust echo offset to compensate for too weak
or strong echoes.
SEABED LVL 200 kHz, SEABED LVL 50 kHz:
If the depth indication is unstable in automatic
operation or the bottom echo cannot be
displayed by adjusting the gain control in
manual operation, you may adjust the bottom
echo level detection circuit, for both 50 kHz
and 200 kHz, to stabilize the indication. Note
that if the level is set too low weak echoes may