105U-G Wireless Gateway User Manual
Page 25 © August 2003
3.2.3 Collinear antenna.
A collinear antenna may be used in the same way as a 3 element Yagi to compensate for the
losses in long lengths of coaxial cable. This type of antenna is generally used at a central site
with more than one remote site or at a repeater site. The collinear antenna looks similar to the
dipole, except that it is longer.
3.3
Power Supply
The 105G power supply is a switch-mode design which will accept either AC or DC supply.
The module includes an integral battery charger for a backup battery.
The module accepts supply voltages in the following ranges :
12 - 24 volts AC RMS or 9 - 30 volts DC at the “supply” terminals, or
10.8 -15 volts DC at the “battery” terminals.
The power supply should be rated at 1.5 Amps.
105U
Antenna installed
with drain holes
down
Coax feed looped
at connection
90
o
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