NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-45
Page
12
Code
01
REVISION 38
AOM-145/1114
ANTENNA STABILIZATION (STAB or STB)
The antenna is normally pitch and roll-stabilized by using attitude
information from the AHRS or IRS. Momentarily pushing the STAB (or
STB) button disables antenna stabilization and an amber “STAB”
annunciation label is presented on the PFDs’ and MFDs’ radar mode
field.
RECEIVER GAIN (GAIN)
The GAIN knob is a rotary control and push/pull switch that controls
radar receiver gain. Two gain modes are available: calibrated or
variable.
Calibrated: When the GAIN knob is pushed in, receiver gain is preset
and calibrated, which is the normal mode of operation. In calibrated
gain, the rotary function of the GAIN knob is disabled.
Variable (VAR): When the GAIN knob is pulled out, the system enters
the variable gain mode. Variable gain is used for additional weather
analysis and for ground mapping. In the WX mode, variable gain can
increase receiver sensitivity over the calibrated level to show very
weak targets or can be reduced below the calibrated level to eliminate
weak returns. In the GMAP mode, variable gain is used to reduce the
level of strong returns from ground targets.
Rotation of the knob counter-clockwise reduces receiver sensitivity.
Rotating clockwise increases receiver sensitivity until its maximum. A
digital readout and gain setting label are displayed on the PFDs’ and
MFDs’ radar mode field.
NOTE: When REACT or TGT modes are selected, the system will be
forced into calibrated gain.
CAUTION:
VARIABLE GAIN MAY BE USED ONLY FOR SHORT
PERIODS OF TIME. DO NOT LEAVE THE RADAR IN
VARIABLE GAIN SINCE SIGNIFICANT WEATHER
TARGETS MAY NOT BE DISPLAYED.
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