TM 11-5841-291-12
1-8. Characteristics, Capabilities, and
goes to the volume control in the control
Features of Radar Warning System
unit and from there, the signal passes
AN/APR-44(V)3.
through the aircraft interface circuits to
the aircraft ICS. Through the ICS, the
a. The radar warning system consists
audio can be heard by the pilot and co-
of eight components: four antennas, a
pilot by means of their headsets. In the
low pass filter, a SAM receiver, an AI
presence of a SAM threat, the lamp alert
receiver, and a control unit. Table 1-1
signal lights the SAM alert indicator on
gives the physical size and weight of
the panel of the control unit. A similar
each component.
lamp signal for a remote indicator is
available through the aircraft interface
circuits. The logic signal generated by
b. Two antennas intercept cw signals
the receiver also passes through the air-
from SAM threats. The output of each
craft interface circuits and is used by
antenna passes through a dual low pass
external equipment.
filter to the front end of the SAM re-
ceiver. An rf switch in the front end
c. Two additional antennas intercept
switches from one antenna to the other
cw signals from AI threats. The output
in 680 millisecond intervals. The SAM
of each antenna is applied directly to the
receiver responds to a cw signal in the
680 millisecond interval and detects and
front end of the AI receiver. The signal
is processed as for the SAM threats but
converts it to audio alert, lamp alert,
lights the AI alert indicator on the panel
and logic signals. All three signals are
of the control unit. Audio, lamp, and logic
available at the same time when a cw
signals are provided as for SAM threats.
signal is detected. The audio signal
RADAR WARNING SYSTEM AN/APR-44(V)3:
1-4
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