Furuno FAR-2807 Operator's Manual page 119

2. Turn on the performance monitor referring to section 1.47.1.
3. After observing the results turn off the performance monitor.
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 conditions in
as much as the original state when the monitor was turned up, the innermost
arcs should appear between approx. 12 to 17 nm. The performance monitor can
observe a total of 10 dB loss in transmitter and receiver.
Display
Note: The lengths of the arcs may vary according to installation environment.
Judge the strength of the echo that appears within 90° behind own ship to
confirm if the radar is working properly or not.
Radar State
Transmitter: normal
Receiver: normal
approx.
12 nm to
17 nm
Transmitter and receiver:
No arc is indication of10 db
approx.
loss. Replacement of the
12 nm to
magnetron is necessary.
17 nm
1. RADAR OPERATION
1-97