Koden CVS-702D, Basic Operation Manual

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Chapter 2 Basic operation CVS-702D
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To use of optimized TVG:

Optimized TVG corrects the reflected signal from shallower than the [Depth] where color is
produced with maximum level. This is done by having room for gain adjustment, in
reference to the diffusional attenuation and absorption attenuation of ultrasonic sound.

By optimized TVG, unnecessary reflection such as noise is eliminated, and necessary
reflection from single fish and fish schools is clearly displayed at the same sensitivity
regardless of their depth.

As optimized TVG always corrects optimized TVG, no adjustment is basically needed. Only
fitting to a desired gain with a gain knob is required.
However, when it is felt that the gain is short due to the excess correction of TVG for
shallower range, please adjust to a desired gain by changing the [Adjust].
<Example of optimized TVG images>
Without TVG Optimized TVG
When adjustment is needed due to excess TVG correction for shallower range:
There are two ways of TVG adjustment: to adjust in the main menu and to assign [F1]/[F2]
keys to adjust by the function keys.