Multiple Echoes; Minimum Range - Icom MR-570R Operating Manual

Icom mr-570r radio-marine: operating guide

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BASIC RADAR THEORY

Multiple echoes

Multiple echoes may appear when a short-range and

strong echo is received from a ship, bridge, or break-

water.

Own ship

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 ship

This target cannot be recognized with radar.

Pulse length

The target in this area cannot be recognized.

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 p. 10 for the [SEA] control.

The ability to see targets very close to the ship is de-

creased if the scanner unit is mounted too high off the

water, because the bottom of the vertical beam of the

scanner cuts off nearby targets.

Vertical beam width

False echoes

True echo

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