Raymarine E90W User Reference Handbook page 128

Tuning method
Enhance Echoes functions:
• Interference rejection — this function minimizes
the effect of interference from other radar-eqipped
vessels.
• Expansion — enables you to override the default
radar pulse length, providing larger target returns.
• Wakes — enables you to see the direction and
speed of moving targets relative to your vessel.
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Related options
– Antenna Boost: scales the effective antenna
size. At zero, the effective antenna size matches
its actual size. At 95%, the effective antenna
size is doubled. Increasing the effective antenna
size separates targets that appear merged at
lower settings.
– Power Boost: adjusts effective transmit power.
At zero, the radar operates at its standard power
(4kW or 12kW). At 90, the effective power is
increased by a factor of at least two. Increasing
the power makes targets more distinct from
noise. For maximum benefit, reduce power
boost to prevent saturation of strong targets.
INT. REJECTION:
• ON — minimizes the effect of interference from
other radar-equipped vessels.
• OFF — allows you to detect the presence of other
radars in the vicinity.
EXPANSION:
• ON — increases the pulse length. This provides
larger target returns, making them easier to see.
However, larger returns may decrease target
resolution, and merge on the display.
• OFF — this is the default setting. It provides better
range resolution, giving you more defined (but
smaller) target returns.
WAKES:
• ON — shows the direction and speed of moving
targets relative to your vessel. Targets are
Description
The enhance echoes functions enable you to minimize
the negative effects of echoes on the radar display.
E-Series Widescreen User reference