BendixKing IN-862A System RDR-2100 - Manual (Page 56)

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Effective Date: 9/98 RDR 2100 Pilot's Guide: Rev 1
at different azimuth angles
(see Figures 13 and 14).
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 Figures 11 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 frequencies normally used by weather radar systems.
When one of these systems 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 2100 operating frequency (see Figure 15). This condi-
tion 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 air-
borne extreme tilt angle adjustment can reduce or eliminate this interfer-
ence.
Weather Radar Interference
Figure 14: CW Interference with
Side-Beam Characteristics
Figure 15: Another Weather Radar’s
CW Oscillator Interference
RDR 2100 PG 3/12/07 3:45 PM Page 52