Furuno FSV-30, Operator'S Manual

Page: 26 / 190

1. OPERATIONAL OVERVIEW
1-12
1.7 Adjusting the Gain
The [GAIN] control adjusts receiver gain (sensitivity) for the horizontal and
vertical modes. Adjust it so fish echoes are clearly displayed with minimal noise
on the screen. Too high a gain setting not only displays excess noise and makes
it difficult to discriminate wanted echoes but also causes bottom echoes to be
painted in strong colors, resulting in echoes being masked by bottom reflections.
Normally, set the control somewhere between positions 3 and 7.
1. If the horizontal and vertical modes are active, press the [H/V H1/H2] key to
show the range and gain indications of the mode you wish to adjust in yellow.
Pressing the [H/V H1/H2] key changes the range and gain indication in
yellow between horizontal1 and horizontal2, or horizontal and vertical,
alternatively.
2. Adjust the [GAIN] control.
New gain setting is momentarily displayed in large characters at the top of
each display. Gain is always displayed at the top right-hand corner of the
horizontal display and bottom on the vertical 1 display.
Gain too low
Gain proper
Gain too high
Example of proper and improper gain settings
on the horizontal display