2. HORIZONTAL MODE
2-17
2.9.3 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 [H1] or
[H2] tab.
4. Select [Int Reject] then push the left-click
button.
5. Select S or T then push the left-click button
to change the setting. The setting range is 0-3. The higher the setting, the greater
the degree of interference rejection.
6. Select [Quit] on the setting box then push the left-click button to close the box.
7. Long-press the MENU/ESC key to close all menus.
2.9.4 Shift TX frequency
If the interference cannot be suppressed by the interference rejector or change in TX
interval, shift the TX frequency from 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 [H1] or [H2] tab.
4. Select [Frequency] then push the left-click button.
5. Select [Freq Shift1] then push the left-click button.
6. Select S or T then push the left-click button to change the setting. The setting
range is -65 to 65.
7. Select the [Quit] on the setting box then push the left-click button to close the box.
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
section 2.9.9.) is set between -3 and -1. Set [Freq Shift1] well apart from [Freq Shift2]
to better suppress sidelobes.
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