Chapter 1 Basic Operation
CVS-1410B
1-10
0093114105-03
1.8 Gain Adjustment
When only the image of High frequency is
displayed, the High frequency gain can be
adjusted. (Setting: 0 to 10)
When only the image of Low frequency is
displayed, the Low frequency gain can be
adjusted.
Caution: If you increase the gain too much,
noise will appear on the entire image,
resulting in an unclear image. Adjust
properly the gain so that the optimum
image can be always displayed.
Over-gain
Under-gain
Optimum
1
Turn [GAIN (HF) Knob] to display [Auto
adjust high]. (The high frequency is
explained below.)
Caution: The low frequency can be done
by [GAIN (LF) Knob].
2
Adjust the gain by rotating the [Knob]. The
[Cursor] key menu position can be moved.
Stop increasing of the gain just before noise
appears on the image.
3
Every time when [GAIN (HF) Knob]
is
pressed, the [TVG] and [Gain (H)] are
alternately displayed.
4
Press the [MENU] to close the menu.
The latest set value of frequency (High frequency
or Low frequency) adjusted is displayed at the
upper left side of menu.
Example:
The High frequency gain is 8.0
→
H: 8.0.
TVG
The TVG adjusts the difference of strength
between echoes reflected from the shallower
depth and echoes reflected from deeper depth
so that the reflection can be uniformed.
The deeper the depth is, the reflected signal of
echo sounder becomes weaker due to
attenuation. Thus, comparing the signal reflected
from the fish of the same size, the signal
reflected from the fish in the shallower depth is
stronger than that in the deeper depth. The TVG
adjusts the echo signal reflected from the
shallower depth to be equal to that reflected from
deeper depth by decreasing the receiver gain so
that the effect that the strength of echo signal
reflected from the shallower depth looks the
same as that reflected from the deeper depth
provided. The level of adjustment due to the
depth increases in the order of [weak]
→
[medium]
→
[strong]. When set to "Strong", the
TVG provides strongest effect that reduces
various noises around oscillation line. [Auto]
becomes the quantity of most effective sensitivity
revision.
1
Press twice the [GAIN (HF) Knob].
2
Select the [weak], [medium], [strong], [Auto].
(Press the [ ] key or [ ] key)
3
Press the [MENU] key to close the menu.
1.9 Use of [EVENT] key
By pressing the [EVENT] key, three functions of
[Store Position]. [Store Image] and [Fishing hot
spot] are available.
The fishing hot spot is the function to instruct
your boat to navigate easily to a point where you
desire to go back.
[Store pos]: The latitude and longitude of a point
can be stored in the destination list.
[Store image]: An image of the echo sounder can
be stored in the internal memory.
[Fishing hot sopt]: The WPT navigation starts,
using the latitude and longitude of a point which
is set as a destination by pressing the [EVENT]
R: M
12.6 V
H: 8.0
TVG
Weak
Medium
Strong
Auto
6.0
Gain(H)
