MINI-LINKEandEMicro
3.4. 1 Block Diagram
Transmitter
Oscillator
Multiplier
& Filter
Final
Amplifier
Branching
Filter
Transmitter
Transmit IF
Signal
Processing
Transmit IF
Signal,
350 MHz
FREQUENCY
CONTROL
DC/DC Converter
Receive IF
Signal,
140 MHz
Command
& Control
Signal
Cable Interface
Receive IF
Signal
Processing
Control &
Supervision
Processor
Alarm and Control
Receiver
Oscillator
Multiplier
and
Filtering
Down
Converter
Filter &
Amplifier
Down
Converter
Low
Noise
Amplifier
Branching
Filter
Output
Level
Control
Power
Detector
RF Attenuator
(accessory)
Antenna
RF Loop
FREQUENCY
CONTROL
OUTPUT
LEVEL SET
DC
First IF
around 1000 MHz
Secondary
voltages
To
Alig nment Port
TX OFF
15, 23 and
26 high power
15,18 and
23 GHz
Receiver
MMU
Radio Interface Sub-unit
Microwave Sub-unit
AFC
Not 38 GHz
3537
Figure 29 RAU1 15-E, 18-E, 23-E, 26-E and 38-E block diagr
am
3.4.2 Radio Interface Sub -unit
The following functions are included in the radio interface sub-unit:
• Cable interface
• Control and supervision
• Transmit IF signal processing
• Receive IF signal processing
3.4.2.1 Cable Interface
The incoming composite signals from the indoor units, that is, transmitt ing IF
signal, command and control signal and DC, are demultiplexed in the cable
interface and forwarded for further processing.
• The transmitt ing IF signal is a modulated signal with a nominal frequency
of 350 MHz
31
AE/LZT 110 2012 R8C 2002- 03-04
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