Controlling The Gain And Range Settings; Adjusting The Gain (Echo Sensitivity) - Simrad ES80 Reference Manual

Controlling the gain and range settings

Topics
Adjusting the gain (echo sensitivity), page 91
Adjusting the TVG (Time Variable Gain) setting, page 93
Choosing and
Range
Choosing and
Range

Adjusting the gain (echo sensitivity)

You can compare this gain setting with the volume control on your car radio. When
the gain is increased, the echoes will appear stronger. Weak echoes will be easier to
see. However, since you also increase the acoustic noise in the reception, the ES80
presentations will also show this noise. Too much gain may therefore "distort" the
presentation.
Context
Comparing the gain function with the volume control on your car radio is not very
accurate. In fact, the gain in the ES80 is constant. The
the sensitivity. This done by controlling the minimum level of detection. When you
increase the gain level (more positive number) , you reduce the minimum level, and thus
increase the sensitivity.
The echo strength (A) changes with time. The minimum level of detection (B) is adjusted
up or down with the
reduces the minimum level, and this increases the sensitivity. Only echoes over the
minimum level are shown in the echogram (C).
406273/C
values in a surface related echogram, page 94
Start Range
values in a bottom related echogram, page 95
Start Range
function. Increasing the
Gain
Operating procedures
function is used to adjust
Gain
with a more positive number
Gain
91