Multiple Echoes; Minimum Range - Icom MR-1210RII Instruction Manual

■ Multiple echoes

Multiple echoes may appear when a short-range
and strong echo is received from a vessel, bridge, or
breakwater.
Your vessel

■ Minimum range

Detection at short range is very important. Minimum
range is determined primarily by transmitter pulse
length, vertical beam width and height of the scanner
unit. The shorter the transmission time, the quicker the
return echoes can be received and their distance mea-
sured.
Pulse starting point
Another vessel
This target cannot be detected by radar.
Pulse length
The target in this area cannot be detected.
BASIC RADAR THEORY
Multiple echoes will appear beyond the target's true
echo point on the same bearing of a large target. They
can be reduced with proper adjustment of the [SEA]/
[ ] control.
See page 18 for the [SEA]/[
The ability to see targets very close to the vessel is
decreased if the scanner is mounted too high off the
water, because the bottom of the vertical beam of the
scanner overshoots nearby targets.
Vertical beam width
8
] control.
False echoes
True echo
40