ATR833 / P/N 833-(1xx)-(1xx)
Operation and Installation
3.8 Antenna
3.8.1 Antenna Selection
•
A VHF-COM-Antenna with an impedance of 50 Ohm is required.
•
Choose an antenna type approved for the aircraft and the mounting
location.
•
Specified features depend on proper installation of the antenna.
3.8.2 Installation Recommendation
•
Take note of the antenna manufacturer’s instructions.
•
The metallic contact between airplane surface and antenna-GND
must be very good. On non-metallic airplanes a metal foil (min. 80 cm
x 80 cm) shall be used as electrical counterweight on the inside of the
belly.
•
To avoid a mutual interference of the radios, the antenna isolation
between a voice transmission and a navigation antenna as well as
between double COM antennas should be as large as possible. A
distance of 2 meters usually is sufficient.
•
Assemble the antenna in vertical position so on or under the belly that
it is as far distant as possible from all protruding parts (propeller,
chassis, vertical stabilizer)
•
For glider installation the internal antenna installed by the
manufacturer should be used.
The HF antenna wire must not be included in any other
cable sets, for example power supply or microphone. It must
also not be placed together with other antenna wires, for
example NAV or Transponder.
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Dokument-Nr.: 01.1402.010.71e / Revision: 1.01
