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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2
Operating Controls
3-8
7 GAIN
The GAIN knob is a single–turn rotary control and push/pull switch that
is used to control the receiver gain. Push in on the GAIN switch to enter
the system into the preset calibrated gain mode. Calibrated gain is the
normal mode and is used for weather avoidance. In calibrated gain, the
rotary portion of the GAIN control does nothing. In calibrated gain, the
color bar legend is labeled 1,2,3,4 in WX mode or 1,2,3 in GMAP mode.
Pull out on the GAIN switch to enter the system into the variable gain
mode with VAR (variance) displayed in the color bar. Variable gain is
useful for additional weather analysis and for ground mapping. In WX
mode, variable gain can increase receiver sensitivity over the calibrated
level to show very weak targets or it can be reduced below the
calibrated level to eliminate weak returns.
WARNING
HAZARDOUS TARGETS CAN BE ELIMINATED FROM THE DIS-
PLAY WITH LOW SETTINGS OF VARIABLE GAIN.
In the GMAP mode, variable gain is used to reduce the level of the
typically very strong returns from ground targets to allow details to be
seen.
Minimum gain is with the control at its full counterclockwise (ccw)
position. Gain increases as the control is rotated cw from full ccw . At
full clockwise (cw) position, the gain is at maximum.
In variable gain, the color bar legend contains the variable gain (VAR)
annunciation. Selecting RCT or TGT forces the system into calibrated
gain.
8 TILT
The TILT knob is a rotary control that is used to select the tilt angle of
the antenna beam with relation to the horizon. CW rotation tilts beam
upward to +15_; ccw rotation tilts beam downward to –15_.
WARNING
TO AVOID FLYING UNDER OR OVER STORMS, FREQUENTLY AD-
JUST THE TILT TO SCAN BOTH ABOVE AND BELOW YOUR
FLIGHT LEVEL.
Stabilization is normally ON. It can be turned OFF by pulling out the
TILT knob. The knob is also used to operate the hidden modes. Refer
to Section 8, In–Flight Troubleshooting
The radar antenna is normally attitude stabilized. It automatically
compensates for roll and pitch maneuvers (refer to Section 5, Radar
Facts, for a description of stabilization). The STAB OFF annunciator is
displayed on the screen.