13. c.
Typical Bottom Omnidirectional Antenna (See figure 13-4.)
——— ——— ——
AD32827
Typical Bottom Omnidirectional Antenna
Figure 13-4
The leadinq particulars
for the bottom omnidirectional antenna must be
obtained f~orn the selected antenna manufacturer.
The omnidirectional antenna mounted on the bottom of the a
fuselage does not provide any directional information, but
the TCAS
computer to interrogate and receive replies from ~
aircraft located beneath own aircraft.
Since TCAS-11 is a
system, intruder bearing is not used
in the computation of
limit maneuver.
The omnidirectional antenna must
exhibit 50
ohms fixed resistance
test.
Identical omnidirectional
bottom antennas connected to the
rcraft
does enable
ntruder
vertical-only
the escape or
exhibit 50
ohm imDedance.
, and must also
to
ground.
This is necessary for
self
antennas may be used for the top and
Mode S transponder.
22-14-00
Page 198.191
Apr 15/93
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