Koden CVS-833 - Menu4; Output (Adjusting Output Power)

CVS-833/833C Chapter 6
Using the Menu
Operational notes for STC amplitude adjustment
(1) STC law A: STC is not enough, causing noise and unwanted residual weak echoes in shallow
and mid depth zone to be shown.
(2) STC law B: STC is appropriate, causing unwanted echoes to be perfectly reduced while schools
of fish are shown without degradation.
(3) STC law C: STC is too much, causing the echoes from fish school to be reduced too much.
6.7 MENU 4
Figure 6.7 Menu 4 display
CMP SUB
10
1
00.0
1/3
: Mod
MENU : Exit
MENU 1
MENU 2
MENU 3
MENU 4
MENU 5
MENU 6
MENU 7
Mix Type
Return
: MENU No. Select
Panel Illum
Bottom Start
Draft
Output
Using MENU 4, the following functions can be
used:
1. Changing transmission output (High / Low
frequency)
2. Setting a depth for bottom detection.
3. Matching to the ship’s draft
4. Adjusting the operation panel illumination
5. Changing the composite image processing
hd
6.7.1 Output (Adjusting output power)
Fish image
This function allows reducing acoustic power for the following applications:
z To decrease noise and interference from other boat’s sounders, reduce the power. This is
effective in minimizing the interference.
z To better display school of fish near the bottom, reduce the power. This allows reducing signal
return from the bottom, thereby the fish echoes can be better discriminated.
Initial setting: 10
Setting range: 1 (weak) to 10 (strong)
Bottom and fish echoes are reduced
in sensitivity, thus both images are
easy to discriminate.
Figure 6.8 The effect by reducing power
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