CVS-128/128B Chapter 2 How to use the menu
0093112802-06 2-13
Caution: Gain (TD) setting value widely
varies upon installation conditions
such as material of hull and
installation method. Low frequency
(50 kHz) may not be used due to large
signal attenuation in some cases.
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 weaker the
reflected signal of echo sounder becomes 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.
1 Press the [MENU] key.
2 Select the [Adjust] [TVG]. (See [2.1 How
to operate the menu])
3 Press the [ ] key.
4 Select the [weak], [medium], [strong].
(Press the [
] key or [ ] key)
5 Press the [MENU] key to close the menu.
Caution: When the setting of [Gain
select] is either one of [Cruising] or
[Fishing], it cannot be selected.
Change the TX power
The strength of transmission output (power)
can be changed.
When the noise of interference with the
neighboring echo sounder occurs, if the powers
of transmission outputs at both sides are
weakened, the interference noise can be
suppressed.
1 Press the [MENU] key.
2 Select the [Adjust] [TX power]. (See [2.1
How to operate the menu])
3 Press the [ ] key.
4 Select the [TX power]. (Press the [ ] key
or [
] key.)
5 Press the [MENU] key to close the menu.
Caution: In [Auto] setting, it controls
transmission power automatically.
Change the Pulse width
Resolution and the detection distance change
by changing the transmission pulse width. As
for [Super short], the detection distance
shortens though resolution goes up. As for
[Long], the detection distance becomes long
though resolution falls.
1 Press the [MENU] key.
2 Select the [Adjust] → [Pulse width]. (See
[2.1 How to operate the menu])
3 Press the [ ] key.
4 Change the setting of [Pulse width]. (Press
the [
] key or [ ] key.)
5 Press the [MENU] key to close the menu.
TX power
1
Auto
20
30
40
50
60
70
80
90
100
TVG
Weak
Medium
Strong
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