User & Installation manual
VHF- Communication Transceiver
Doc.-Nr.:
DE-3000-800100e
KRT2, KRT2M, KRT2RC
Revision 13.0
Jul. 2016
56 / 67
6.9 Antenna
6.9.1 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
6.9.2 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 be installed vertically and as far as possible 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.
THIS IS VERY IMPORTANT
