Kongsberg Simrad SN90 Reference Manual page 485

A Bottom Filter
Noise Filter (1)
B
Gain & TVG (Time Variable Gain)
C
Noise Filter (2)
D
AGC (Automatic Gain Control)
E
RCG (Reverberation Controlled Gain)
F
Display Gain
G
Ping-Ping Filter
H
Note that ,
Gain TVG
only to illustrate the complete "signal path".
Details
Off
The filter is disabled.
Weak
Use for schools.
Medium
Use for schools with higher density. This setting can also be used in horizontal
views to detect schools close to the bottom.
Strong
Use for scattered fish located close to the bottom. This setting uses a slightly
different algorithm than the other scattered fish settings.
4
Use for scattered fish located close to the bottom. This setting uses a slightly
different algorithm than the other scattered fish settings.
5
Use for scattered fish located close to the bottom. This setting uses a slightly
different algorithm than the other scattered fish settings.
381294/E
(Time Varied Gain) and
Functions and dialog boxes
are not filters, but included
Display Gain
483