Tcg Control - Plastimo ECHOFISH 820 Manual De Instalación Y Funcionamiento

The 200 kHz narrow beam sonar return looks darker than
the 50 kHz wide beam sonar returns.
To set the Frequency:
1) Press MENU to enter into menu setting.
2) Use the Up/Down Arrow to select Sonar option.
3) Press Right Arrow to enter into Sonar setting.
4) Use the Up/Down Arrow to select the Frequency option.
5) Press Right Arrow to enter into the setting.
6) Press Up / Down Arrow to change the option.
7) Press ENT to confirm the setting.
8) Press EXIT to exit the menu setting.
Note: For the fish targets detected at 200 kHz, the depth
readout on the fish ID is displayed in Green color. For the
fish targets detected at 50 kHz, the depth readout on the
fish ID is displayed in Red color.

8. TCG Control

This function is optimized for high power output sonar sys-
tem. It enables the sonar to work correctly in a noisy envi-
ronment.
The sensitivity is automatically changed in different depths.
The diagram below shows the sensitivity changes according
to depth. This is done to control the surface noise and self-
ring of the transducer.
Note: on the diagram, the TCG function only controls the signal
between 0~5 meters. If the environment is noisy, and you want
to see the underwater conditions in the shallower layer near
0~5m, the TCG Control must be set on "On".In air, the signal
consumption is much bigger than in water. If you try to test the
sonar sensitivity in the air, the TCG Control must be set on "Off".
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Echofish 820 – Installation & Operation manual