Apexpro Antenna System - GE ApexPro TT Technical Manual

Equipment Overview

ApexPro antenna system

Antenna
Antenna amplifier
Coaxial cable
Splitters/combiner
Attenuators
Power supply
Bias tee
2-4
The antenna system is used for transmission of data from the transmitter to the
receiver system.
The antenna is a circularly-polarized array of sloping half-wave dipoles with an omni-
directional coverage pattern. The antenna is available in two versions: active and
passive. An active antenna includes an active amplifier, while a passive antenna
provides no signal amplification. The receiver antenna comes with a standard drop
ceiling T-bar mount.
The antenna amplifier boosts the signal when losses from other antenna components
exceed the gain of the antenna. DC power for the amplifier is obtained from the
+12VDC power supply.
Coaxial cabling is used to connect the omni-directional antennas and amplifiers to the
receiving equipment. Controlled-impedance cabling is used and 75-ohm, RG-6 type
is recommended. Plenum- or riser-rated cable is used to meet NEC fire codes. RG-11
may be used if cable lengths become long and dB losses become excessive.
Passive splitters/combiners split or combine the RF signal into multiple paths. The
same splitter may also be used as a combiner to join multiple RF signals into one
path. There are two-, four-, or eight-way splitters available that are DC-passive.
Attenuators lower signals and balance antenna runs. The attenuators are DC-passive
and are available as 3 dB, 6 dB and 10 dB attenuators.
A +12VDC power supply at 1A supplies power to the antenna system. Power supplies
accept AC voltages between 90-270VAC. AC inputs have internal fuses that are not
replaceable. The output of the supply is short circuit protected.
The antenna bias tee allows the injection of DC power from the antenna power supply
into the antenna system cabling. The bias tee supplies RF isolation between the RF
signals on the antenna cabling and the power supply. It contains a DC block that
ApexPro™ 2001989-351A