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TRACKFISH 6600 Installation and Operation Manual 39
NAVMAN
8-5 Gain, threshold and range
The TRACKER has three settings that affect
the sonar display:
Gain: The gain of the sonar receiver. The
gain should be high to display good detail,
but if the gain is too high then information
from the strong bottom signal is lost and
false echoes might be displayed. There
is a separate gain setting for each sonar
frequency, 50 kHz and 200 kHz.
Threshold: Return echoes less than
the threshold are ignored. The threshold
should be as low as possible, but if the
threshold is too low, unwanted noise
will be displayed. Threshold is set as a
percentage of gain. For example, if the
threshold is 50 %, then return echoes
less than 50 % of the maximum signal are
ignored. There is a separate threshold
setting for each sonar frequency, 50 kHz
and 200 kHz.
To display the current settings for gain
and threshold, select a sonar display and
press ENTER:
Range: The vertical depth covered by a
TRACKFISH sonar display. For example,
if the range is 100 m, then the sonar
display shows depths between 0 and 100
m. The range is displayed at the bottom,
right corner of a sonar display.
If the bottom is deeper than the speci ed
depth range, it will not be shown on
the display.
The TRACKFISH has three operating modes,
Cruise, Fishing and Manual (see section 8-1).
In Cruise and Fishing modes, the TRACKFISH
automatically adjusts gain and threshold for
good performance and adjusts range to always
show the bottom. In manual mode, you can
hand adjust the settings.
8-5-1 Changing between
automatic and manual modes
Select a sonar display before changing mode
(see section 9).
a Using an automatic mode
Press GOTO/AUTO and select Cruise
or Fishing (see section 8-1). The
TRACKFISH will adjust gain, threshold
and range automatically.
b Using manual mode
Press GOTO/AUTO and select Manual.
The TRACKFISH reverts to your last
manual settings (see section 8-1).
c Adjusting gain or threshold manually
1 Press ENTER to display the
gain window:
2 Press
or to select the setting
to adjust.
3 Press
or adjust the setting.
If the TRACKFISH is in Cruise or Fishing
modes, it will stop adjusting gain and
threshold automatically but will continue
to adjust range automatically.
Tip: Use the A-scope display to help
set gain or threshold manually (see
section 8-5-2).
To revert to automatic:
Either press GOTO/AUTO and select
Cruise or Fishing.
Or press ENTER to display the gain
window, select Manual and press .
The TRACKFISH will not adjust
threshold automatically; if gain is
manual it will stay manual.
This display is called the gain window.
38


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