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CPN and FF525 Operation Manual Page 21
2. Tap on the Soft Key.
3. Tapping on
INTERF REJECT selects between On and Off.
4. When the item you want has been selected, press the
key or tap on to exit the menu.
4.6 SENSITIVITY MENU
All settings in the Sensitivity menu are related to the selected Fish Finder transmit frequency
(50 or 200 kHz). Select the Fish Finder page then follow the procedure below:
1. Tap anywhere on the screen.
2. Tap on the
Soft Key.
3. Tap on
SENSITIVITY MENU. A popup window will be shown with the available options
GAIN, STC, STC STRENGTH and SURF NOISE FILT.
4. Tap on the desired item (see the following paragraphs).
5. When the item you want has been selected, press the
key or tap on to exit the menu.
4.6.0 GAIN
Allows you to control the Sensitivity of the unit’s receiver from 0 to 100%. To see more detail,
increase the receiver Sensitivity by selecting a higher Gain percentage. If there is too much
detail or if the screen is cluttered, lowering the Sensitivity may increase the clarity of the
display.
When the Gain Mode option is set to Auto, the receivers Gain cannot be changed.
When the Gain Mode option is set to Manual, the Gain can be manually adjusted. When switching
from Automatic to Manual Mode, the Gain + Offset value is copied into the Manual Gain setting of
the receiver.
4.6.1 STC (SENSITIVITY TIME CONTROL)
The STC function attenuates echoes from surface down to the specified STC depth by
changing the sensitivity of the receiver, decreasing it near the surface and gradually
increasing it as the depth increases. STC impacts bottom finding so it can be particularly
useful to track a rocky sea bottom distinguishing it from mud in suspension over it. For
example when close to rivers outlet to the sea (consider to use at same time also Dual
Frequency mode and White Line for an easier identification of real sea bottom), as well as
to solve issues in false bottom detection when in presence of significant surface clutter
(reading shallow, example 3 Ft).
Its default value is SHORT for the 200 kHz frequency and MID for the 50 kHz frequency.
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