Garmin GTS 855 User Manual download pdf (Page 10)

Garmin GTS 8XX Series Trafﬁc Advisory System

190-00587-02 Rev. A

GTS 8XX Series Antenna Conﬁgurations

• Toponlydirectionalantenna.

• Topdirectionalwithbottommonopoleantennas(recommendedforxed

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 bottom-

mounted 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 bottom-

mounting 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.

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Garmin GTS 855 User Manual Page 10