MINI-LINKEandEMicro
3523
Figure 57 Radio unit RTU
The RTU consists of cover, frame, connection unit, modem board, microwave
unit and filter unit.
The connection unit forms the bottom of the radio unit cover and it holds alarm
indicators (LEDs) and connectors for traffic, grounding, DC power, antenna
alignment and operation and maintenance.
The connection unit is also equipped with lightning protection.
The modem board consists of circuits for baseband encoding/decoding and
the traffic interface.
The microwave unit is a circuit board assembly, consisting of a radio board
and two MCMs (Multi-chip Modules) for the transmitting and receiving parts of
the radio unit. The high frequency MCM components are shielded with an
aluminum cover. In addition, it contains the DC/DC converters, control and
super vision functions and components for IF signal processing.
The f ilter unit consists of two branching filters and an impedance T-junction
that is the interface with the antenna.
80
AE/LZT 110 2012 R8C 2002-03-04
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