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Chapter 11: Working with sonar 93
the strength at which the echoes are displayed. If the gain is low only the
strongest echoes are displayed; as the gain increases, more, but weaker
echoes are displayed, such as those from air bubbles.
The gain controls should be set high enough to see fish and bottom detail,
but without too much background noise. Generally, a high gain is used in
deep/clear water; a low gain in shallow/murky water.
RayTech provides automatic or manual gain control adjustment. Automatic
adjustment is based on depth and water conditions. As conditions change
the auto-gain adjusts to display echoes with a minimum of background
noise. You can manually adjust the gain, but will need to re-adjust it as
conditions change.
Color gain mode
The color gain mode determines how echoes of different strengths are
displayed. The color gain sets the lower limit for the top color band. All
echoes with a signal strength above this value are displayed in the stron-
gest color or shade.
Setting a low value produces a small band for the strongest color, but a
wide signal band for the other colors. Setting a high value gives a wide
band for the strongest color, but a small signal band for the other colors.
RayTech provides automatic or manual color gain adjustment. Automatic
adjustment displays colors based on current conditions, using as many
colors as possible, whilst minimizing noise and clutter. You can manually
adjust the color gain, but will need to re-adjust it as conditions change.
TVG
Time Varied Gain (TVG) reduces surface clutter by reducing the gain in the
top 100 ft. of the display and is useful for reducing noise, such as that
generated by boat movement and floating debris that often appear in
shallow water. A low TVG value has little effect on gain in shallow water; a
high TVG value decreases the gain in shallow water so that only the stron-
gest echoes are displayed. You can adjust TVG manually or automatically.
To adjust the gain controls:
1. Click
Transducer Settings
.
2. Click Gain. The gain control softkeys are displayed.
3. Click the appropriate softkey to adjust the gain control settings.
94 RayTech RNS V6.0 - Users Guide
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