Interference Rejector; Shift Tx Frequency - Furuno FSV-85 Operator's Manual

3. VERTICAL MODE
3.9.2

Interference rejector

This control is similar to the interference rejector on echo sounders and radars. It is
effective for rejecting random noise and sea surface reflections in rough sea condi-
tions. Set it so that noise is just eliminated. Do not use an unnecessarily high setting
since it may also reject small wanted echoes.
1. Press the MENU/ESC key to show the main menu.
2. Select [Picture Setting] then push the left-
click button.
3. Press the H/V/S key to select the [V] tab.
4. Select [Int Reject] then push the left-click but-
ton.
5. Select
to change the setting The setting range is 0-
3. The higher the setting, the greater the de-
gree of interference rejection.
6. Select [Quit] on the setting box to close the box.
7. Long-press the MENU/ESC key to close all menus.
3.9.3

Shift TX frequency

If the interference cannot be suppressed by the interference rejector or change in TX
interval, shift the Tx frequency with the [Frequency] menu.
1. Press the MENU/ESC key to show the main menu.
2. Select [TX/RX Setting] then push the left-click button.
3. Press the H/V/S key to select the [V] tab.
4. Select [Frequency] then push the left-click button.
5. Select [Freq Shift1] then push the left-click button.
6. Select
range is -80 to 80 (for 70 kHz) or -65 to 65 (for 80 kHz).
7. Select [Quit] on the setting box then push the left-click button.
8. Long-press the MENU/ESC key to close all menus.
Note 1: In some cases the frequency cannot be changed because of operating band-
width. In this case the frequency setting is grayed.
Note 2: The setting for [Freq Shift2] is valid when [Sidelobe Sup. A] (see page 3-12)
is set between -3 and -1. Set [Freq Shift1] well apart from [Freq Shift2] to better sup-
press sidelobes.
3-12
or then push the left-click button
or then push the left-click button to change the setting. The setting