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10
1. Identify a suitable target (for example, ship
or buoy) at a range between 0.125 to 0.25
miles, preferably near the heading mark. To
minimize error, keep echoes in the outer
half of the picture by changing the range.
2. Press and hold down !and " together
(about 10 seconds) to display the
installation menu.
SEL MENU
BY / KEY
TOTAL ON TIME
00000 : 00
TOTAL TX TIME
00000 : 00
ADJUST PICTURE ORIENTATION
USING KEYS SO THAT
HEADING MARK BISECTS TARGET
LOCATED DEAD AHEAD.
TUNE
Total hrs radar
has been on
Total hrs radar
has been trans-
mitted
Tuning bar
(for technicians)
Instructions for item selected appears here.
(example: heading adjustment)
Menu
1. ADJ HDG
2. ADJ TMG
3. NM/KM
/
Figure 20 Installation menu
3. Select ADJ HDG. Your display should now
look something like the one shown in
Figure 21.
30°
30°
SEL MENU
BY / KEY
TOTAL ON TIME
00000 : 00
TOTAL TX TIME
00000 : 00
ADJUST PICTURE ORIENTATION
USING KEYS SO THAT
HEADING MARK BISECTS TARGET
LOCATED DEAD AHEAD.
1. ADJ HDG
2. ADJ TMG
3. NM/KM
TUNE
0.25
NM
.125
/
Figure 21 Display for adjustment of heading
4. Press !or" to bisect the target selected at
step 1 with the heading marker.
5. Press MENU.
0.25
.125
NM
NM
9.4°
0.015
LL
WP
CSE
SPD
-
-
-
.
-
-
° M
-
-
-
.
-
-
NM
Target
Heading
marker
-
-
°
-
-
.
-
-
N
-
-
-
°
-
-
.
-
-
E
-
-
-
.
-
-
° M
-
-
.
-
KT
Figure 22 How to adjust heading
6. As a final test, move the boat towards a
small buoy and confirm that the buoy
shows up dead ahead on the radar when it
is visually dead ahead.
3) Sweep timing
This adjustment ensures proper radar
performance, especially on short ranges. The
radar measures the time required for a
transmitted echo to travel to the target and
return to the source. The received echo
appears on the display based on this time. Thus,
at the instant the transmitter is fired, the sweep
should start from the center of the display
(sometimes called sweep origin.)
A trigger pulse generated in the display unit
goes to the antenna unit through the antenna
cable to trigger the transmitter (magnetron).
The time taken by the signal to travel up to the
antenna unit varies, depending largely on the
length of signal cable. During this period the
display unit should wait before starting the
sweep. When the display unit is not adjusted
correctly, the echoes from a straight local object
(for example, a harbor wall or straight pier) will
not appear with straight edges – namely, they
will be seen as pushed out or pulled in near the
picture center. The range of objects will also be
incorrectly shown.
16


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