Raymarine ST50 plus Specifications download pdf (Page 28)

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ST50 PLUS RADAR Operation and Installation Handbook

3.2.7 Side Lobes

A very small part of the RF energy from each transmitted pulse is

radiated outside the single narrow beam, producing side lobe patterns.

Side lobes have no effect on distant or small surface objects, but the

echo from a large object at short range may produce an arc on the

radar screen similar to a range ring, or appear as a series of echoes

forming a broken arc. Side-lobe echoes normally occurs at a range

below 3 miles and can be reduced by adjustment of the SEA control.

Section 3. Operation

3.2.8 Radar Interference

Whenever two or more radar equipped vessels are operating within

reception range of each other, mutual interference is likely. This will

usually appear on the screen as a series of small dots, which move to

and from the PPI center, sometimes in a straight line, but more often

in a long, sweeping curve. This type of interference is most noticeable

in longer ranges. This should not, as a rule, impair the effectiveness

of the radar as a navigational aid. Radar interference can be completely

eliminated by turning

“ON” on the Display Unit function menu. The

IR feature is normally left “on”.

3.2.9 False Echoes

Occasionally, signals will appear on the screen at positions where

there is no actual target. These targets are called “False Echoes” and

may be caused by Ghost Images, Indirect Echoes or Multiple Echoes.

There are several types of ghost images. They sometimes have the

appearance of true echoes, but in general they are intermittent and

poorly defined. A ghost image retains a fixed relationship with respect

to the true image and has a more arc-like appearance with a tendency

to smear. They are sometimes caused by targets which have a wide,

smooth surface near your own ship.

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Raymarine ST50 plus Specifications Page 28