Weather Radio User Manual

PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Operating Controls
3-10
12 GAIN
The GAIN knob is a single-turnrotary control andpush/pull switchthat
is usedto controlthe receivergain. Pushin onthe GAINswitch toenter
the system into the preset calibrated gain mode. Calibratedgain is the
normalmodeandisused forweatheravoidance.Incalibratedgain,the
rotary portion of the GAIN control does nothing. In calibrated gain, the
colorbarlegendislabeled1,2,3,4inWXmodeor 1,2,3inGMAPmode.
Pull out on the GAIN switch to enter the system into the variable gain
mode with VAR 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 MAY 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.
Minimum gain is with the control at its full ccw position. Gain increases
as the control is rotated cw from full ccw . At full 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.