The High Gain Antenna System is based on a dual helix coil system with mechanical antenna steering. The TH-HGA comes in two mechanical variations, one for fixed wing aircraft with a soft dust cover and one for rotary wing aircraft with a hardened radome. Both Thuraya antennas offer the L-band RF interface for interconnection to an ARINC 741 compliant DLNA or HLD unit. As the antennas are equipped with an embedded beam steering unit, the antenna control can be directly done trough an ARINC 429 interface. Alternatively, the antenna offers a coaxial interface for control through an external beam steering unit (this is an integral part of the TH-SDU unit). In this case, the ARINC 429 input is not in use.
High Gain Antenna System
The TH-HGA-6000 version is designed for the use under a radome in the top of the tail fin of a transport aircraft or larger business jet or on the fuselage of smaller airplanes. The antenna has no need for a metal surface as a mounting base - ground plane effect - and is therefore ideal for the use on modern "carbon fibre" aircraft bodies.
The TH-HGA-6500 version is equipped with a hardened radome (rated for max. airspeed of 240 knots) and is additionally qualified for most stringent vibration on helicopter airframes. The antenna comes with a fixed mounting plate which offers best mounting to the airframe and full sand & dust sealing.