Honeywell IntuVue RDR-4000 Pilot's Manual page 30

Reducing the gain can also help
identify embedded storm cells
within the stratus rain. It can
help identify areas of significant
attenuation by making radar
shadows more prominent.
Areas of missing terrain returns
in MAP mode that correspond
with strong weather echoes may
indicate a larger area of
precipitation than is apparent on
the weather display. (See
SHADOWED AREAS on page
44.)
GAIN CONTROL AT
THE MIN POSITION
Increase the gain briefly at
any altitude to discover the
relative reflectivity of a
weather formation that is
visible out the window but
does not initially appear on
the display. This occurs
when the reflectivity of the
cloud is below the standard
threshold for green weather.
Expanded Operating Instructions
26
IntuVue RDR-4000 Weather Radar Pilot's Guide
GAIN CONTROL AT
THE AUTO POSITION
Use MAX gain only when
at cruise altitudes. In
ELEVN mode, MAX gain is
useful when looking at
altitude slices above the
freezing level where
particles are less reflective.
High levels of moisture
above the freezing level
are key ingredients in hail
formation.
GAIN CONTROL AT
THE MAX POSITION
D201002000008
Rev 1, December 2014