Furuno FCR-2139S-BB - Magnetron Reset (for A- and B-Types)

2. RADAR, CHART RADAR OPERATION
2-47
*
1
Gain is automatically set according to [PM GAIN ADJ] if it was adjusted at installa-
tion.
*
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 arcs. You
can set the number of 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 between 8.0 NM and 19.8 NM. The performance monitor can ob-
serve a total of 10 dB loss in the transmitter and receiver.
Note: The lengths and location of the arcs may change with 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.
2.31 Magnetron Reset (For A- and B-types)
After replacing the magnetron for the antenna unit, reset the TX time then adjust the
PM gain as follows:
1. Open the menu then select [8 INITIAL SETTING].
RAIN AUTO MAN No Setting before activation
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
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.
Replacement of the magnetron is neces-
sary.
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