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1 Dec 2003
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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
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Table 9. ANT-81A TCAS Directional Antenna Leading Particulars
(cont)
Characteristic
Description
Main Beam Characteristics
Operational Beam Positions
4
Half Power Azimuth Beam Width
(measured over -15 to +20 elevation)
≥
90
°
Steering Quantization
90°
Omni Beam Characteristics
Operational Beam Positions
360°
Beam Null Compared to Main Beam (at
each elevation from -15 to +20)
≥
9 dB
Input Port VSWR
1.5:1 maximum
Antenna Cable Loss Requirement
2.5 ± 0.5 dB at 1030 MHz for each coaxial cable including
connectors.
Antenna Cable Differential Phase Delay
One-half wavelength maximum (approximately 5 inches)
Maximum Peak Input Power
1000W pulsed
Maximum Average Input Power
10W continuous
ARINC Characteristic
ARINC 735A
TSO
C119a (C119b for change 7 units)
Environmental Certification
In addition to environmental requirements defined in Table
14, an altitude immersion environmental requirement
requires that the antenna not outgas at an altitude of 55,000
feet when submersed in water for 30 minutes.