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TVG (Time Variable Gain)
As the acoustic signal travels through the water it is
attenuated in strength and also loses strength because the
signal is being spread over a larger and larger area. For
this reason, distant targets appear weaker than close
targets - even if both targets are of identical size.
The Sea Scout’s receiver circuit includes a Time
Variable Gain (TVG) feature where the receiver’s gain is
controlled by the microprocessor and increases in value as
the depth or forward range increases. This feature tends
to compensate for the weakening of the signal at longer
distances as the receiver’s gain will be increased as the
signal gets smaller.
Sides of
Underwater
Trench
Bottom
Under Boat
Bottom Getting
Deeper to port
(left) of boat.
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