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2. RADAR, CHART RADAR OPERATION
2-7
2.5.1 How to select a pulse length
You can select the pulse length for the 0.5 to 24 nm range
scales as shown below.
1. Open the menu then select [1 ECHO], [1 CUSTOMIZE
ECHO] and [8 PULSE] menus to show the [PULSE]
menu.
2. Do one of the following:
Control Unit: Press appropriate numeric key to select
corresponding item number.
Trackball module: Click appropriate item.
3. Select desired option by pressing the numeric key
pressed at step 2 or spinning the scrollwheel.
4. To confirm selection, press the ENTER key on the Con-
trol Unit, or push the left button.
2.5.2 How to change the pulse length
1. Click the [Pulse] button at the top of the InstantAccess bar.
2. Click a pulse length.
2.6 How to Adjust the Sensitivity
The GAIN control (or [Gain] button) adjusts the sensitivity of the receiver. The proper
setting is such that the background noise is just visible on the screen. If you set up for
too little sensitivity, weak echoes may be missed. On the other hand excessive sensi-
tivity yields too much background noise; strong targets may be missed because of the
poor contrast between desired echoes and the background noise on the display.
Adjust the gain so background noise is just visible on the screen.
How to adjust the sensitivity from the Control Unit
While monitoring the radar image and the gain slider bar, operate the GAIN control to
adjust the sensitivity.
How to adjust the sensitivity from the trackball module
For coarse adjustment, put the cursor within the slider bar area then push the left
button. For fine adjustment, put the cursor at the end of the slider bar then roll the
trackball while pushing and holding down the left button. Release the button to finish.
Put cursor on slider bar and push and
hold left button. Drag cursor to new
location then release left button.