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Chapter Two Installation
man_905_2.0.doc Page 13
2.2.3 Collinear (3dB) aerial.
A 3dB collinear aerial 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 aerial is generally used at a central site with more
than one remote site or at a repeater site. The collinear aerial looks similar to the dipole, except
that it is longer.
2.3 Power Supply
The 905 power supply is a switch-mode design which will accept either AC or DC supply. The 905
module may also be powered from a solar panel without an external solar regulator.
The 905 module accepts supply voltages in the following ranges :
12 - 24 volts AC RMS or 15 - 30 volts DC at the “supply” terminals, or
10.8 -15 volts DC at the “battery” terminals.