Furuno 1623 Operator's Manual page 36

RADAR SETUP
HEADING ADJUST
TIMING ADJUST
SET ON TIME
SET TX TIME
[MENU/ESC]: Exit
Radar setup menu
4. Choose HEADING ADJUST.
5. Press ► to show the options window.
RADAR SETUP
HEADING ADJUST
TIMING ADJUST
SET ON TIME
SET TX TIME
[MENU/ESC]: Exit
Radar setup menu (heading adjust)
6. Press ▲ to select YES.
The heading adjustment display appears.
7. Press ◄ or ► to bisect the target
selected at step 1 with the heading line.
8. Press the [MODE] key.
9. As a final test, move the boat towards a
small buoy and confirm hat the buoy
shows up dead ahead on the radar when
it is visually dead ahead.
Timing adjustment
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
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: NO
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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.
Target pushed
Correct
inward
Improper and correct sweep timing
1. Transmit on a range between 0.125 and
0.5 nm and adjust the sensitivity and A/C
SEA. (See page 4 and 5, respectively.)
2. Visually select a straight echo (harbor
wall, straight pier).
3. Select TIMING ADJUST from the Radar
Setup menu.
RADAR SETUP
HEADING ADJUST
TIMING ADJUST
SET ON TIME
SET TX TIME
[MENU/ESC]: Exit
Radar setup menu (timing adjust)
4. Press ►, ▲ in order to select YES.
The timing adjustment display appears.
5. While looking at the target selected at
step 2, straighten it by pressing ▲ or ▼.
6. Press the [MODE] key.
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Target pushed
outward
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