Adjusting The Gain; Shifting The Range - Furuno NAVNET 1734C Operator's Manual

4. VIDEO SOUNDER OPERATION

4.3.3 Adjusting the gain

Normally, set the gain to the point where excessive noise does not appear on the screen.
Use a higher gain setting for greater depths and a lower setting for shallow waters.
Press the GAIN key to show the gain window, and adjust the ENTER knob or Cursor pad.
Current level is shown on the bar, and the setting range is 0-100(%). Press the RETURN
soft key to finish.
GAIN - LF
57
HIGH
LOW
Gain window
Note 1: On the dual-frequency display, the gain can be independently set for LF and HF.
Use the FREQ LF/HF soft key to select the frequency for which to adjust gain.
Note 2: Gain cannot be adjusted in the automatic sounder mode. The message
"SOUNDER GAIN CANNOT BE CHANGED IN AUTO MODE" is displayed when you
attempt to do so.

4.3.4 Shifting the range

The basic range may be shifted up or down as desired by pressing the SHIFT soft key
followed by adjusting the ENTER knob. Press the RETURN soft key to finish.
4-8
Gain too high Gain proper
Examples of proper and improper gain
Shift concept
Gain too low