BendixKing IN-862A System RDR-2100 - Manual (Page 55)

Effective Date: 9/98 RDR 2100 Pilot's Guide: Rev 1
51
Weather Radar Interference
WEATHER RADAR
INTERFERENCE
There are at least four
common types of external
interference that may cause
spokes to appear on the
radar display.
The first type of interference
is referred to as CW
(Continuous Wave). Figures
11 through 14 show varia-
tions of this type of interfer-
ence. One possible source
is ground based microwave
data links. Another source
is various kinds of military
equipment.
The most common type of
CW interference appears as
a wedge on the radar dis-
play (see Figure 12). In rare
cases the entire display may
be washed out momentarily.
If the wedge-type source of
interference happens to be
located in the aircraft flight
path, the interference may
last for thirty minutes or
more.
If the CW interference
comes from a ground based
source, the azimuth angle of
the wedge will change as the
aircraft flies past the source
location (see Figures 12 and
14). Frequently, when a
radar system is experiencing
this type of interference,
spokes of lesser intensity will
be observed at various off-
beam-axis angles. In other
words, there will be a high
intensity spoke with one or
more lower intensity spokes
Figure 11: Possible Jammer
Figure 12: CW Interference
Figure 13: CW Interference (Possible
Jammer)
RDR 2100 PG 3/12/07 3:45 PM Page 51