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Each TVG amplifier has three operator controls. They are located on the top panel of the Sonar Processor. Recommended
settings for the TVG controls are provided in the Operation Section of this manual. Final TVG adjustments are made
by the operator while the unit is running. The function of these controls is to adjust the amplifiers to compensate for losses
that occur when the signal travels through the water. When they are adjusted properly, a reasonably even color is
displayed across the screen during side scanning. The even color is the result of reflections off the bottom.
Near Gain - Adjusts the TVG gain at the start of the sweep.
Far Gain - Adjusts the TVG gain at the finish. Operator adjusts for even color of the displayed line.
Overall Gain - Adjusts the gain of the complete line up or down. It adjusts overall darkness or lightness.
Note: The analog signal below (for both the left and right channels) is visible on the display so the operator
can be viewing the analog signal while making the TVG adjustments. The goal is to have a reasonable
flat signal along its length (not downward or upward sloping).
Near
A
Gain
m
p
l
i
t
u
d
e
LEFT CHANNEL GAIN
5
6
4
7
3
8
3
2
9
2
1
10
OVERALL GAIN
Overall Gain Increases Or
Overall gain adjusts the overall amplitude
Decreases The Overall Gain
of the signal (increases or decreases it).
(Amplitude) Of The Complete Line
5
6
4
4
7
8
3
9
2
1
1
10
FAR GAIN
NEAR GAIN
22
5
6
7
8
9
10
Far
Gain
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