Improving The Recognition Of Fish And Schools Using Receiver Filters; About The Receiver Filter Sequence In The Sn90 - Simrad SN90 Operator's Manual

Improving the recognition of fish and schools
using receiver filters
Topics
About the receiver filter sequence in the SN90, page 79
Reducing noise and reverberation with the AGC (Automatic Gain Control) function,
page 80
Reducing propeller noise and interference with the Noise Filter, page 81
Reducing bottom and surface reverberation with the RCG (Reverberation Controlled
Gain) function, page 82
Reducing noise and false echoes with the Ping-Ping Filter, page 84
Adjusting the intensity of the echo presentations, page 86

About the receiver filter sequence in the SN90

The filters in the SN90 are implemented in "series". Any changes to a filter setting may
therefore have an effect on subsequent filters.
Bottom Filter
A
B Noise Filter (1)
Gain & TVG (Time Variable Gain)
C
D Noise Filter (2)
AGC (Automatic Gain Control)
E
F RCG (Reverberation Controlled Gain)
Display Gain
G
H Ping-Ping Filter
Note that ,
Gain TVG
only to illustrate the complete "signal path".
381295/B
(Time Varied Gain) and are not filters, but included
Display Gain
Operating procedures
79