Chapter Two Installation
man_905-105_2.16 Page 15
2.3 Power Supply
The 905U/105S power supply is a switch-mode design which will accept either AC or DC supply. The
module may also be powered from a solar panel without an external solar regulator.
The module accepts supply voltages in the following ranges :
12 - 24 volts AC RMS or 15 - 30 volts DC at the “supply” terminals, or
11.5 -15 volts DC at the “battery” terminals.
The power supply should be rated at 1.5 Amps and be CSA Certified Class 2. For use in Class 1 Div 2
explosive areas, the power supply must be approved for Class 1 Div 2 use.
Note: Connect module to the same ground/earth point as the antenna mounting to avoid differences in
earth potential during voltage surges. The modules needs an earth connection for the internal surge
protection to be effective.
For licensed 105U units with RF power above 2W, the unit needs to be powered from the 12V
“Battery” terminals with a power supply of at least 2A rating. Alternately, the unit can be
powered via the SUP1 / SUP2 terminals, provided a backup battery is connected to the
“Battery” terminals to supply the inrush current for the radio transmitter. This is not required
for units with radio power less than 2W.
2.3.1 AC Supply
The AC supply is connected to the "SUP1" and "SUP2" terminals as shown below.
The AC supply should be "floating" relative to earth. AC transformers with grounded/earthed
secondary windings should not be used.
2.3.2 DC Supply
For DC supplies, the positive lead is connected to "SUP1" and the negative to "GND". The positive
side of the supply must not be connected to earth. The DC supply may be a floating supply or
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