BendixKing IN-182A System RDR-2000 User Manual
Page 57
Effective Date: 5/98 RDR 2000 Pilot's Guide: Rev 3
53
Weather Radar Interference
This phenomenon results
from the side-beam charac-
teristics of the antenna.
If the source of interference
is an airborne jammer, mul-
tiple spokes may be dis-
played as in
and
13. Normally, adjusting the
antenna tilt angle to extreme
up or down angles will
reduce, or even eliminate,
this type of interference.
The second type of radar
interference comes from
other weather radars oper-
ating within the area. All
radar systems have a low-
power CW oscillator within
the system. Some of the
power emitted from this oscil-
lator is continually radiated
from the antenna. These
oscillator emissions are well
below the level which will
harm an individual, but well
above the sensitivity of a
nearby weather radar. When
some weather radars are in
the TEST mode, the CW
oscillator periodically scans
the entire range of frequen-
cies normally used by weather radar systems. When one of these sys-
tems is in your area and operating in the TEST mode, a spoke may
appear on the display when the other system scans through the RDR
2000 operating frequency (see Figure 15). This condition will most likely
occur before takeoff or when landing in the vicinity of other weather radar
equipped aircraft. Adjusting antenna tilt angle will not have much effect
in remedying this situation. However, once airborne extreme tilt angle
adjustment can reduce or eliminate this interference.
Figure 14: CW Interference with
Side-Beam Characteristics
Figure 15: Another Weather Radar’s
CW Oscillator Interference