Furuno FR-2125V User Manual
Page 110
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Indirect echoes
A target at close range is usually picked up directly, but it can also be received as reflec-
tion from a large, flat surface. This will result in the radar presenting two or more echoes
on the display, each at a different range. The ARPA can acquire and track the false echo if
it is detected by five consecutive scans. Reduction in radar gain can eliminate the multiple
echoing but care should be taken as range detection also will be reduced.
Radar interference
If interference is extreme due to another radar operating at close range, spiral “dotting”
and/or false targets may appear momentarily. The interference rejector can clear the dis-
play. To receive radar beacon or SART signals, turn off the radar interference rejection
and echo average which operate on the correlation technique.