MINI-LINKEandEMicro
3.5.1 Block Diagram
Transmitter
Oscillator
Multiplier
Power
Amplifier
Branching
Filter
Transmitter ( MCM )
Transmit IF
Signal
Processing
Transmit IF
Signal,
350 MHz
FREQUENCY
CONTROL TX
Receive IF
Signal,
140 MHz
Cable Interface
Multiplier
Down
Converter
Filter &
Amplifier
Down
Converter
Low
Noise
Amplifier
Branching
Filter
Output
Level
Control
Antenna
FREQUENCY
CONTROL RX
OUTPUT
LEVEL SET
974 MHz
TX OFF
Receiver ( MCM )
Receiver
Oscillator
DC
Secondary
voltages
DC/DC Converter
To Alignment Port
Microwave Unit
Oscillator
IF
FREQUENCY
CONTROL IF
Command
& Control
Signal
Control &
Supervision
Processor
Alarm and
Control
IF Converter
834 MHz
Filter Unit
MMU
RF
Loop
RSSI
140 MHz
3539
Figure 31 RAU2 block diagram
3.5.2 Microwave Unit
3.5.2.1 DC/DC Conver ter
The DC/DC converter provides stable voltages for t he radio unit.
3.5.2.2 Cable Interface
The incoming com posite signals from t he indoor units, that is, transmitting IF
signal, command and control signal and D C, are demultiplexed in the cable
interface and forwarded for further processing.
• The transmitting IF signal is a modulated signal with a nominal frequency
of 350 M Hz
• The command and control signal up-li nk is an ASK (Amplitude Shift Keying)
modulated signal with a nominal frequency of 6.5 MHz.
• The DC feed is in the range of 45 – 60 V DC (24 – 60 V DC, nominal,
is connected to the MMU).
36
AE/LZT 110 2012 R8C 2002-03-04
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