Installation manual

Simrad SD570
26
850--160139 / A
5.5 TVG (Time Variable Gain)
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 distance). The TVG reaches the maximum gain at
1000 meters.
TVG........:
OFF
10 LOG R
15 LOG R
*20 LOG R
25 LOG R
30 LOG R
In addition to OFF, the TVG can be selected with five different
curveslopes, eachhaving different gainregulation. The line inthe
menu marked with an asterisk shows the theoretically correct
setting (20 log R). With this setting, the gain is adjusted in such
a 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.