Operation Manual

Simrad SH80
142
850-164385 / Rev.C
TVG (Time Variable Gain)
The TVG button is located in the Horizontal and Vertical
menus.
The TVG controls the gain in the signal amplifier. The gain is
weakest just after the ping, and increases in accordance with time
(and therefore range).
In addition to Off and Auto, the TVG can be selected with six
different curve slopes, each having different gain regulations. The
Auto line in the menu is marked with an asterisk to indicate the
theoretically correct setting for the different range settings.
With this setting, the gain is adjusted in such way that a school of
fish with a certain size and density will be presented with
approximately the same strength on the screen in any position
inside the regulated TVG range.