Simrad EQ60 - Manual (Page 91)

Instruction manual
79
857-164342 / Rev.C
Limit gain regulation - Due to the high dynamic range in the
EQ60 echo sounder, invidious gain settings may result in
unwanted noise. This will also cause the fish size estimates to be
erroneous. This gain regulation setting will limit the receiver
gain to maximum 100 dB. The limitation will prevent the echo
sounder from saturation.
Bottom Gain - This parameter controls the display sensitivity
of the echo sounder below the detected bottom depth. A
numeric value of 70 sets the lower limit of the echogram colour
scale equal to a surface backscattering strength of -70 dB.
No TVG - This parameter controls the display sensitivity of the
echo sounder when No TVG is selected in the Echogram
dialogue box. A numeric value of 70 sets the lower limit of the
echogram colour scale equal to a measured input level of -70
dB.
Removing colours
By left-clicking on the colours in the colour rectangle in the
upper right-hand corner of the screen, the selected colour will
become the weakest colour shown in the Echogram and Single
Echo views.
To restore the colour range, click on the removed colour’s
position.
Note that this is a display function only. It does not have any
effect on the sounder’s performance. It will however affect the
recordings made by the History function.
Related topics
→
Echogram, page 81