GTX 33 Installation Manual 190-00906-00
Page 2-4 Rev. F
2.3.2 Antenna Location Considerations
Antenna mounting should utilize the aircraft manufacturer’s Type Certificated antenna location and style
of antenna. If a second (diversity) antenna is installed in the aircraft, considerations for its mounting should
be made as outlined in Figure 2-1. The antenna installation should be installed in accordance with
AC 43.12-2A Chapter 3. Note that penetration of the pressure vessel on the pressurized aircraft requires
additional data not contained in this manual. (See Section 2.5)
Figure 2-1. Antenna Installation Considerations
• The antenna(s) (Garmin P/N 010-010160-00) or equivalent should be mounted away from major
protrusions, such as engine(s), propeller(s), and antenna masts. It should also be as far as
practical from landing gear doors, access doors, or other openings that could affect the radiation
pattern.
• The main antenna should be mounted vertically on the bottom of the aircraft. The optional
second (diversity) antenna should be mounted vertically on top of the aircraft. Horizontal
separation must be no more than 7.6 meters (25 feet).
• Avoid mounting the antenna within three feet of the ADF sense antenna or any other
communication antenna and six feet from the DME antenna.
• To prevent RF interference, the antenna must be physically mounted a minimum distance of three
feet from the GTX 33.
If the antenna is being installed on a composite aircraft, sufficient ground plane material
must be added. Conductive wire mesh, radials, or thin aluminum sheets embedded in the
composite material provide the proper ground plane allowing the antenna gain pattern to
be maximized for optimum transponder performance.
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