User manual - JG Technologies
User manual - JG Technologies
User manual - JG Technologies
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14.8 Fishfinder sensitivity adjustments<br />
The Adjust Sensitivity menu gives you access to features and<br />
functions which enhance what is displayed on screen.<br />
Sensitivity options include:<br />
• Gain Mode<br />
• Auto Adjust<br />
• Color Gain<br />
• TVG<br />
• Color Threshold<br />
• Power Mode<br />
Sonar gain<br />
The gain settings alter the way the DSM processes background<br />
noise (also called clutter). Adjusting the gain settings can improve<br />
the sonar image, however for optimum performance in most<br />
conditions, we recommend that you use the auto settings.<br />
The gain adjusts the return threshold (echo strength) above which<br />
the fishfinder will show an object on the screen.<br />
There are two gain modes:<br />
• Auto<br />
• Manual<br />
Auto<br />
In Auto mode, the DSM sonar automatically adjusts the gain setting<br />
to suit current conditions. Any adjustments made apply to all<br />
fishfinder windows using that particular frequency.<br />
There are three Auto modes, each suited to different scenarios:<br />
• Low (Cruising) is ideal for viewing fishfinder images with a<br />
minimum of background noise as you are cruising to your fishing<br />
spot. Only the strongest echoes are displayed.<br />
• Medium (Trolling) is a slightly higher gain setting that displays<br />
more detail. This is the default mode.<br />
• High (Fishing) provides the most detail, but also displays the<br />
most background noise and surface clutter.<br />
Manual<br />
If necessary you can set the gain controls <strong>manual</strong>ly, between a<br />
value of 1 to 100 (default value is 75). This value should be set<br />
high enough to see fish and bottom detail but without too much<br />
background noise. Generally a high gain is used in deep and/or<br />
clear water; a low gain in shallow and/or murky water.<br />
The new values remain set even when you switch off the display,<br />
they are applied to both the active window and any other fishfinder<br />
windows with the same frequency.<br />
Selecting automatic fishfinder gain<br />
From the fishfinder application:<br />
1. Select Menu.<br />
2. Select Adjust Sensitivity.<br />
3. Select Gain Mode.<br />
4. Select the Gain Mode menu so that Auto is highlighted.<br />
Selecting Gain Mode will switch between Auto and Manual gain<br />
modes<br />
5. Go Back to the Sensitivity menu.<br />
6. Select Auto Adjust.<br />
7. Select the required Auto Gain mode.<br />
Adjusting the fishfinder gain <strong>manual</strong>ly<br />
From the fishfinder application:<br />
1. Select Menu.<br />
2. Select Adjust Sensitivity.<br />
3. Select Gain Mode.<br />
4. Select the Gain Mode menu so that Man is highlighted.<br />
5. Use the Rotary Control to adjust the gain to the required setting.<br />
The new values remain set even when you switch off the display,<br />
they are applied to both the active window and any other fishfinder<br />
windows displaying the same frequency.<br />
Fishfinder color gain<br />
You can adjust the color gain to change the signal strength threshold<br />
for the strongest color in your fishfinder display.<br />
Color gain sets the lower limit for the strongest echo color. All<br />
echoes with a signal strength above this value are displayed in the<br />
strongest color. Those with a weaker value are divided equally<br />
between the remaining colors.<br />
• Setting a low value produces wide band for the weakest color, but<br />
a small signal band for the other colors.<br />
• Setting a high value gives a wide band for the strongest color, but<br />
a small signal band for the other colors.<br />
There are two color gain modes:<br />
• Auto. In Auto mode the color gain setting is automatically<br />
adjusted to suit current conditions. Any adjustments made apply<br />
to all fishfinder windows.<br />
• Manual. You can set the color gain <strong>manual</strong>ly, between a value<br />
of 1 to 100.<br />
Adjusting the fishfinder color gain<br />
From the fishfinder application:<br />
1. Select Menu.<br />
2. Select Adjust Sensitivity.<br />
3. Select Color Gain.<br />
4. Select the Color Gain menu so that Man is highlighted.<br />
Selecting the Color Gain menu will switch between Auto and<br />
Manual color gain.<br />
5. Use the Rotary Control to adjust the Color Gain to the required<br />
setting.<br />
The new values remain set even when you switch off the display<br />
and are applied to all fishfinder windows.<br />
Fishfinder TVG (Time Varied Gain)<br />
The Time Varied Gain (TVG) function reduces the amount of clutter<br />
in the fishfinder display by varying the gain throughout the column of<br />
water. This function is useful for reducing the appearance of ‘noise’.<br />
• Increasing the TVG value increases the maximum depth to which<br />
TVG is applied. A high value decreases the gain in shallow water<br />
so that only the strongest echoes are displayed.<br />
• Decreasing the TVG value reduces the maximum depth. A low<br />
TVG value has little effect on gain in shallow water.<br />
TVG adjustment can be made automatically or <strong>manual</strong>ly.<br />
Adjusting the fishfinder time varied gain<br />
From the fishfinder application:<br />
1. Select Menu.<br />
2. Select Adjust Sensitivity.<br />
3. Select TVG.<br />
4. Select the TVG menu so that Man is highlighted.<br />
Selecting the TVG menu will switch between TVG Auto and<br />
Manual modes.<br />
5. Use the Rotary Control to adjust the TVG to the required setting.<br />
Note: TVG has no effect in fishfinder simulator mode.<br />
Fishfinder color threshold<br />
The color threshold setting determines the range of colors used on<br />
screen. The effect of this is to set a color threshold below which<br />
targets are not shown. For example a low setting would result in<br />
only the strongest (orange and red) targets being displayed.<br />
Adjusting the fishfinder color threshold<br />
From the fishfinder application:<br />
1. Select Menu.<br />
2. Select Adjust Sensitivity.<br />
3. Select Color Threshold.<br />
4. Select the Color Threshold menu so that the setting is<br />
highlighted.<br />
5. Use the Rotary Control to adjust the color threshold to the<br />
required setting.<br />
164 e7 / e7D / e95 / e97 / e125 / e127 / c95 / c97 / c125 / c127