Garmin GTS 820 Pilots Guide - Page 10
GTS 8XX Series Antenna Configurations, GA 58 Directional Antenna
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GTS 8XX Series Antenna Configurations • Top only directional antenna. • Top directional with bottom monopole antennas (recommended for fixed gear aircraft) provides improved intruder visibility. The type of antenna used will be primarily limited by the amount of space available on the bottom of the airplane. Any aircraft that can utilize the directional antenna on the bottom would benefit from its use. • Top directional with bottom directional antennas (recommended for retractable gear aircraft) provides benefit of intruder bearing visibility for targets that are shaded from the top directional antenna. GA 58 Directional Antenna The GA 58 directional four element antenna is included with the basic GTS system to provide altitude, distance, and bearing of threat aircraft. A single antenna installation uses top-mounted placement. A second GA 58 may be bottommounted to optimize coverage. Figure 2 GA 58 Directional Antenna Bottom Mounted Directional Antenna (optional) A directional antenna may be used as an additional antenna for bottommounting to reduce shading and provide altitude and distance of threat aircraft. Interrogations from the bottom directional antenna are transmitted in an omnidirectional pattern, but it still allows bearing determination from replies received on the bottom antenna. 6 Garmin GTS 8XX Series Traffic Advisory System 190-00587-02 Rev. A