3. INITIAL SETTINGS
3-3
Item description
• [Simulation]: Normally, set to [Off.] To view the demonstration picture, select [On].
• [Antenna Rotation]: Select [Rotate] to rotate the antenna and transmit radar puls-
es. The [Stop] setting, which transmits radar pulses without rotating the antenna, is
for use by the service technician.
• [Heading Alignment]: You have installed the antenna unit so that the unit faces to-
ward the bow. A target at the front of the boat and aligned with the bow must appear
on the heading line (zero degrees). If the target does not appear on the heading line,
do the procedure shown below to adjust the heading.
1. Set ship heading toward an acceptable target (for example, ship at anchor or
buoy) at a range between 0.125 and 0.25 nautical mile.
2. Transmit the radar at the range of 0.25 nautical mile and measure the bearing
of that target relative to ship heading with an EBL.
3. Open the [Installation] menu and select [Heading Adjust].
4. Press the ENTER key to show the heading adjustment window.
5. Press or to set the value measured at the above step 2. Check that the
target appears on the heading line.
6. Press the ENTER key to finish.
• [Sweep Timing]: This adjustment gives correct radar performance on short ranges.
The radar measures the time required for a transmitted echo to go to the target and
return to the source. The received echo appears on the display according to the
measured time. The sweep must start from the center of the display.A trigger pulse
created in the display unit goes to the antenna unit through the signal cable to acti-
vate the transmitter (magnetron). The time taken by the signal to move to the anten-
na unit changes, according to the length of the signal cable. During this period, the
display unit must wait before the radar starts the sweep. When the display unit is
not adjusted correctly, the echoes from a straight object will not appear as a straight
line. The target appears "pushed" or "pulled" near the picture center. The range to
objects are shown at wrong distances.
1. Transmit on the shortest range, then adjust the gain and the A/C SEA.
2. Visibly select a target that creates a straight line (harbor wall, straight piers).
3. Open the [Installation] menu and select [Timing Adjust].
4. Press the ENTER key to show the timing adjustment window.
5. Press or to make straight the target selected at step 2, then press the EN-
TER key to finish.
(1) Target pulled (2) Correct (3) Target pushed outward
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