Koden ESR-145, Operation Manual

Page: 47 / 86

3-7
FUNCTION SETTINGS
2. TVG CURVE
TVG offsets the effects of propagation loss of sound as it passes through the water.
Propagation loss of sound is the sum of spreading and attenuation losses. The TVG
curve is adjusted to counter the loss.
•
Each press of [ ← ] or [ → ] key changes the setting, "STC, 10LOG, 20LOG, 30LOG,
40LOG."
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Select the desired value.
•
STC : STC function
10LOG : Curve 1 in the below drawing.
20LOG : Curve 2 in the below drawing.
30LOG : Curve 3 in the below drawing.
40LOG : Curve 4 in the below drawing.
•
In accordance with the distance the gain increases automatically even if the gain
volume is unchanged as seen in the above drawing.
3. DYNAMIC RANGE
By shifting the dynamic range, the display to reflect the received echo more precisely or
the display to discriminate their density is selected.
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Each press of [ ← ] or [ → ] key changes the setting, "1dB, 2dB, 3dB."
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Select the desired value.
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The diagram shows the comparative signal
threshold levels for the dynamic ranges.