GE Reason RT430 Technical Manual page 35

RT430
An antenna mast of roof-mounting-kit and any supporting structure must be properly grounded to provide
protection against voltage surges and built-up static charges. We recommend the use of surge protector for
the entire wiring where there is external antenna cable.
The antenna has to be connected to the unit by using a coaxial cable with a 50Ω impedance. The antenna
cable should be routed through a conduit, shielded from rain and/or solar radiation. The conduit should not
be shared with any power circuits.
It is recommended the use of a 3/4 PVC conduit, threaded on one end. To install it, cut down to the intended
size and screw the antenna in the conduit. The conduit can be fixed on the wall, so that the antenna is above
the wall limit and free from lateral obstacles, as shown in Figure 13 .
Figure 13: Posição recomendada para instalação do eletroduto da antena GPS
Cables with lengths ranging from 15m (50 ft) to 150 m (492 ft) can be purchased from Alstom. For use of
antennas and cables from other manufacturers, contact Alstom.
Refer to topic 1.6 Technical Specifications for specifications of the antenna and cable.
The antenna cable affects the unit's performance in two distinct ways: GPS signal attenuation and
propagation delay of the GPS signal. Technical information about these factors may be found in Appendix D.
RT430-TM-EN-5 35