EQUIPMENT MANUAL FOR RD-9120
RD-9120 QE
Copyright - refer to title page
Page 16
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Power Supply Unit (PSU):
The PSU converts the input 220VAC into stable DC to supply power to FS, PA, LNA, MCU and to charge
Li-ion battery.
Surge protector:
The surge protector is mounted next to the PSU. Within it there are three connections: 220V VAC Live,
Neutral and ground. This provides protection to the PSU. It is assumed the antenna system will have
ample lightning protection themselves. On the top of each surge protector is a little window, beneath which
is a coloured indicator, ‘Green’ indicate protection is available, and in the event of a fault, these will turn to
‘Black’, and has to be replaced.
When the equipment is DC powered, no surge protector is required.
Wireless Modem:
The wireless modem is mounted adjacent to the MCU. It has connection of RF, data and power. It is used
for remote control and the MCU sends out alarms to the repeater OMC via the wireless modem. On the
modem there is an indicator LED to show modem status.
Li-ion Battery:
The Li-ion battery-pack is enclosed within a plastic cover and provides back-up supply to the MCU for up
to three hours in the event of mains failure.
Distribution Board:
The distribution board serves as a distributor for power and internal communication and connectivities to
the function modules, MCU, RS232 port for local control.
