BendixKing IN-182A System RDR-2000 - Manual (Page 44)

Stabilization of the radar beam compensates for moderate aircraft
maneuvers. The Line-of-Sight system used is not absolute, but has limi-
tations. Recognize limitation errors. Errors in the order of one-half
degree or less can produce this effect. With the beam just contacting the
horizon at 180 nautical miles, a 1/2 degree of further down tilt moves this
contact point in to 130 nautical miles. Isolated terrain targets would now
appear.
Introducing a 1/2 degree roll error compounds the effects; down on one
side, up on the other side (1 degree unbalance).
STABILIZATION FLIGHT TEST CHECKLIST
1. Fly the aircraft being tested to 10,000 feet AGL .
2. Select the MAP mode, STAB OFF, and set the indicator to 20 nm.
3. Set manual gain to maximum.
4. While flying level (0 degree pitch, 0
degree roll), adjust the tilt control
for a video pattern shown in Figure
1.
Note: Record tilt position for future ref-
erence.
5. If the inner ring of video is not par-
allel to the range marks, the
mounting of the antenna is not par-
allel to the horizontal axis of the air-
craft.
40
Effective Date: 5/98 RDR 2000 Pilot's Guide: Rev 3
Antenna Stabilization
130 NM
180 NM
Figure 1