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B
Obstructions and ground plane discontinuities, such as door hatches, cowl-
ings and unriveted airframe skin overlaps must be 18 inches from the near-
est edge of the TAS Antenna. Other antennas, particularly high profile and
L-band transponder antennas, cannot be located in front of or within 30
inches (edge to edge) of the top mounted TAS directional antenna. This will
ensure a minimum of 20 dB of isolation at 1090 MHz, while minimizing far-
field path distortion in the forward quadrants.
B. Mount the antenna on the aircraft skin which is horizontal during enroute
flight. Antenna baseplate must be level within + or - 5° in longitudinal and
lateral axes when the aircraft is in level flight. Refer to
and notes.
C. The antenna must be mounted on a nearly flat surface such that the
antenna contacts the bare metal skin all around the perimeter without gaps
when normal mounting screw torque is applied.
Aircraft with fixed landing gear must be equipped with a bottom mono-
pole antenna. Furthermore, the landing gear discrete must be strapped
to the retracted position. The bearing from a bottom directional is inval-
idated when landing gear is extended, so it would always be invalidated
on a fixed-gear aircraft. (Therefore, there would be no use for a directional
antenna.)
Rev 3, August/2002
NOTE
10609I03.CDL
KMH 880/KTA 870
Figures 2-4
and
2-5
Page 2-16
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