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2. RADAR, CHART RADAR OPERATION
2-43
*
1
Gain is automatically set according to [PM GAIN ADJUST] if it was adjusted at in-
stallation.
*
2
North-up RM is selected when the mode is North-up TM.
*
3
The setting is not memorized.
*
4
The performance monitor is deactivated if the range is changed.
How to check radar performance
The range scale is automatically set to 24 nm. The radar screen will show one or two
arcs. If the radar transmitter and receiver are in good working order in as much as the
original state when the monitor was turned on, the innermost arc should appear be-
tween 13.5 and 18.5 nm. The performance monitor can observe a total of 10 dB loss
in the transmitter and receiver.
Note: The lengths and location of the arcs may vary according to the direction in which
the antenna unit is installed. Judge the strength of the echo that appears within 60°
from arc location to confirm if the radar is working properly or not.
Turn off the performance monitor when finished.
RANGE 24 NM, 24 SM,
48 km, 48 kyd
Yes *
4
Setting at deactivation
SEA 0 No Setting before activation
SEA AUTO MAN No Setting before activation
STC RANGE Setting stored No Setting at deactivation
TUNE AUTO No Setting before activation
VIDEO
CONTRAST
4B No Setting before activation
WIPER OFF No Setting before activation
Display Transmitter, receiver state
Transmitter: Normal
Receiver: Normal
Transmitter and receiver:
No arc indicates 10 db loss.
Have a technician check the magnetron.
Item
Setting at activation
of PM
Adjustable while PM
is active
Setting at deactivation
of PM
13.5 nm
to 18.5 nm
13.5 nm
to 18.5 nm