Furuno FCV-2100 Operator's Manual page 98

4. ADVANCED SETTINGS
Calibration menu
Use the Calibration menu to apply offsets for the external fish finder.
Menu item
[Zero Line Rejec-
tion]
[Zero Line Area]
[Draft]
[Fish Size]
[Sound Speed]
Calibration menu - HF/LF settings
Sounder
HF
B tt Bottom Level L
LF
Gain ADJ G i ADJ
Display
System
Range
TX/RX
HF
LF
Calibration
HF
LF LF LF LF LF LF LF LF LF
Menu item
[Bottom Level]
[Gain ADJ]
4-22
Sounder
HF
Zero Line Rejection Z Li R j
LF
Z Zero Line Area Li A
Display
D ft Draft
System
Fi h Si Fish Size
Range
TX/RX S Sound Speed d S d
HF
LF
Calibration
HF
LF LF LF LF LF LF LF LF LF
Turn the zero line (transmission line) on or off. When turned [On],
the transmission line disappears, which allows you to see fish
echoes near the surface clearly. The width of the transmission line
changes with transducer used and installation characteristics.
Adjust the transmission line so that the transmission line disap-
pears when the [Zero Line Rejector] is turned on. For a long tail, in-
crease the value. If the transmission line does not disappear, lower
the TX power.
The default depth display shows the distance from the transducer.
If you would rather show the distance from the sea surface, set your
ship's draft. The draft line for HF and LF can be set respectively.
Compensate for incorrect fish size indications. A positive value in-
creases compensation, a negative value decreases compensation.
For example [+50] increases the size indication by 1.5 times.
Adjust the sound velocity of the TX/RX signal if the depth indication
is incorrect, often caused by water temperature or salinity.
HF
l 0
0
In the default bottom level setting [0], the equipment judges con-
secutive strong echoes to be bottom echoes. If, in that setting, the
depth indication is unstable, adjust the bottom level. If vertical lines
extend upward from the bottom echo in the bottom lock display,
lower the bottom level to erase the vertical lines. If the level is too
low, however, it may be difficult to distinguish bottom fish from the
bottom echo.
If the gain is too high or too low, or the gain for the low and high
frequencies appears unbalanced, you can compensate it here.
Calibration
ti Off
4.5
0.0
0
1500.0
Description
Sounder
HF
LF
Display
System
Range
TX/RX
HF
LF
Calibration
HF
LF LF LF LF LF LF LF LF
Description
LF
Bottom Level B tt L l 0
Gain ADJ G i ADJ 0