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4. VIDEO SOUNDER OPERATION
4-26
4.14 Changing Pulse Repetition Rate
Pulse repetition rate can be changed. Normally, the highest rate (20) is used.
When in shallow waters, second reflection echoes may appear between surface
and actual bottom echo. In this case lower the PRR level. The option “SPD
SENSING PRR” means the ship’s speed dependent mode, where the PRR
changes automatically with ship’s speed (required speed input.) For further
information about the ship’s speed dependent mode, see page 4-18.
1. Press the [MENU] key to open the menu.
2. Press the SOUNDER MENU soft key.
3. Select PRR LEVEL.
4. Press the EDIT soft key to open the setting window.
5. Use the trackball
to select the rate for repetition.
6. Press the ENTER soft key followed by the [MENU] key to close the menu.
Too small setting reduces the number of pulse repetition. This may cause a
problem to search fish schools. Select “20” unless multistage reflections appear
on the display.