题目内容

A localizer (LOC) antenna array generally consists of several pairs of ____ antennas.

A. precision
B. directional
C. non-directional
D. non-precision

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Each ILS antenna ____ a narrow beam, one slightly to the left of the runway centerline, the other to the right.

A. transmits
B. sends
C. transfers
D. delivers

A glideslope or glidepath (GP) antenna array is sited to one side of the runway ____ zone.

A. threshold
B. touchdown
C. stopway
D. stopend

The ____ of the glideslope signal is arranged to define a glideslope of approximately 3° above ground level.

A. centerline
B. front
C. back
D. sideline

Localizer and glideslope carrier frequencies are ____ so that only one selection is required to tune both receivers.

A. separated
B. matched
C. paired
D. mated