Installation manual

User & Installation manual
VHF- Communication Transceiver
Doc.-Nr:
DE-3000-800100e
KRT2 & KRT 2A
Revision 4.0
37 of 45
5.9. Antenna
5.9.1. Antenna Selection
• A 50 Ohms impedance VHF-COM-antenna is required.
• The antenna must be approved in respect to aircraft type and
installation location.
• The antenna specifications can only be fulfilled when properly installed
5.9.2. Installation Recommendation
• The manufactures instructions have to be observed.
• The metallic contact between airplane surface and antenna ground
must be very good. Non-metallic airplanes must have installed a metal
sheet, foil or mesh of at least 80×80 cm inside the fuselage as electric
counterweight..
• In order to avoid interference the distance between a COM an NAV
antenna or between a COM and another COM antenna should be as
large as possible. A distance of 2 meters normally is sufficient.
• The antenna must vertically be installed as far as possible away from
parts like propeller, landing-gear, rudder etc., that may influence
propagation of the radio signals.
• In gliders the internal antenna provided by the airplane manufacturer is
to be used.
The RF-antenna cable may not be part of other cable
sets like power-supply or microphone. It must not be placed
together with any other COM, NAV or transponder antenna cable.