air
avionics
4. Installation Overview
Figure 4.6.: Cockpit antenna reception/radiation pattern
1090 MHz External Antennas
In larger aircraft that are mostly made of conductive materials such as metal or carbon fiber,
installing an external antenna for 1090 MHz may be beneficial for optimum performance.
Normally, such an external antenna would be placed underneath the fuselage of the aircraft.
1. Always install 1090 MHz antennas vertically on a conductive surface of at least a
15 cm (6 inches) diameter.
2. Ensure that the antenna cable is routed away from the antenna in an orthogonal way
in the first 15 cm (6 inches) or use angled antenna connectors (for external antennas).
3. Do not coil the antenna cable.
4. Ensure that no conductive parts (metal, carbon fiber) are close to the antenna.
5. Install the antenna in a location where it has a clear view and is not obstructed from
nearby structural parts like the landing gear.
6. Try to avoid placing the antenna closer than 1m from the aircraft’s transponder, DME,
and TAS antennas.
AT-1
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Installation Manual
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rev. 4.0
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2020/01/09
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