F.u.n.k.e. ATR833A-OLED - Antenna; Antenna Selection; Antenna Cable; Installation Recommendation

ATR833A / P/N 833A-(xxx)-(1xx)
Operation and Installation
37 Dokument-Nr.: 01.1411.010.71e / Revision: 3.00
4.8 Antenna
4.8.1 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.
• The antenna should be located far away from ELT-antennas and
other VHF antennas.
• Specified features depend on proper installation of the antenna.
4.8.2 Antenna Cable
The antenna is connected by a 50 Ohm coaxial cable. The
connection to the radio requires a male BNC connector.
4.8.3 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.
The cable length, the attenuation of the selected cable and
the quality of the connections has a direct effect on the
transmitted power at the antenna. For suppo
rt please
contact your maintenance organization.