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PILOT'S OPERATING
HANDBOOK
SUPPLEMENT
WEATHER
RADAR
(X-BAND)
(TYPE RDR-160)
2.
MODE SELECTOR AND GAIN CONTROL
-
Selects weather
radar
and ground
mapping modes of operation with
manual
gain selection for ground
mapping.
Switch positions
are
as follows:
'
MAP I
GAIN
(Ground
Mapping) -
Places indicator in
MAP mode
and
disables
contour feature.
In the
MAP mode,
6 levels
of GAIN
may
be manually
selected from MAP (maximum gain) to MIN (minimum gain)
during
ground
mapping
mode.
All targets will
be
presented
on the
indicator
in
up
to 3 different
shades,
depending on the radar echo strength
and
the particular
click-gain
setting used.
Wx (Weather)
-
Places weather indicator image
gain
in a preadjusted level.
Contour
operation is automatic
and
constant.
Contoured storm
cells
will appear
as
dark holes
which will
be
outlined by lighter shades
automatically.
WxA (Weather Alert)
-
When the Mode
Selector
is
in the
WxA
position,
verification
of
storm
cloud contouring is
provided.
If
a
dark
hole seen
in the
Wx
mode
is a
contour
or storm
cell,
its presentation will
alternate fro
m darkest
shade to
brightest shade
approximately 1
time
per
second.
If
a
dark hole remains
the same
intensity
while in the
WxA
mode, then this area of
the
display does not represent a contour or
storm
cell.
3.
ANTENNA
TILT
CONTROL - Electronically adjusts
the radar
beam
to 15
degrees
up, or
down,
with respect
to
the airplane axis to
compensate
for
differences
in
airplane attitude.
4.
BRT
CONTROL - Controls
the brightness
of the indicator
display.
-~
-
5.
BEARING
MARKS -
To assist in
determining relative bearing
of return, marks
are
provided
30°
either side
of the
0°
or forward mark.
6.
HOLD SWITCH -
The
HOLD
switch
is a
push-pushbutton. Pushing
the
HOLD
button in
puts
the image in the hold mode;
pushing
the
button
in again puts the
image in the scan
mode.
HOLD (Pushbutton Engaged)
- Weather
or ground
mapping
image
last
presen
ted
is
retained (frozen)
on the indicator display in
order to
evaluate
the
significance
of
storm cell
movement.
Switching back to
scan
from Hold
mode
reveals relative
direction
and
distance of
target
movement
during
hold period
if airplane heading and speed were
not
changed,
The word
"HOLD"
will
be
flashing on
the
display
screen
when in the
HOLD mode.
SCAN
(Pushbutton Disengaged) - When
the
HOLD pushbutton
is disen-
gaged,
presentation
is unfrozen and
normal
scanning
updates
the
picture
with
each
sweep.
Figure
1.
Weather Radar (X-Band Type RDR-160) (Sheet 2 of 3)
3
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