Installation manual

Simrad SH80

TVG

The TVG (Time Variable Gain) parameter dialogue opens when

you click the

TVG buttonintheHorizontal 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).

The TVG can be selected with six different curve slopes, each

having different gain regulations. The

Auto option 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.

The following options are available in the

TVG parameter

dialogue:

•

Off: C li ck to switch the TVG off.

•

Auto: Click to select automatic selection of TVG function.

•

[x] LOG R: C lick to select TVG function.

•

Close: C lick to close the parameter dialogue.

•

Help: Click to access the on-line help.