64
TO ADJUST SENSITIVITY
In case of single frequency display
[Gain]
This adjusts the sensitivity to distinguish the
bottom or fish school easily.
32 steps of sensitivity from 0 to 31 is displayed
in bar.
Optimum sensitivity is that second reflection
from bottom is barely displayed.
[Second reflection]
First received echo reflected from bottom is
called the first reflection.
It’s first reflection reflected from the surface of
water goes toward the bottom again.
The next reflection from bottom is called the
second reflection.
Normally, it’s second reflection is shown on the
twice depth of the actual bottom (first reflection).
[To decrease sensitivity]
Each time when you press GAIN1 (L) key,
gain bar becomes short and the sensitivity
decreases.
[To increase sensitivity]
Each time when you press GAIN1 (H) key,
gain bar becomes long and the sensitivity
increases.
1
GAIN1 key
This describes operation for single frequency display.
※
You can change sensitivity by GAIN1 key or GAIN2 key.
※
Single frequency display or dual frequency display is selected on menu. (
→
page 71)
※
When the unit is delivered from factory, dual frequency display mode is set.
Second Reflection
Bottom
0
10
20
30
40
50
Gain Bar
Summary of Contents for HE-6801
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Page 66: ...MEMO 60 ...
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Page 98: ...92 Brand Plate Operation Manual Transducer Only HE 6801 HE 6901 Map Card ...
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