Ericsson Radio Systems AB PKRC1311004-1 Manual De Usuario
Unit Decription, CDU-G and CDU-F
CPU
MR
CDU b
us
DC in
Pr
in1
Pr
in2
TX2-2
TX2-1
TX1-2
TX1-1
Pr
in1
Pr
in2
CNU
FC
TXLP
TXBP-DPX
MCU
RXBP-DPX
RXBP
TX/RX
RX
Pr1out
Pr2out
Pr1out
Pr2out
DC
CXU
RX2
RX1
TXin
LNA
Po
w
er supply
super
vision
P007451A
TX2-1+TX2-2
TX1-1+TX1-2
Figure 71
Block diagram of CDU-F
The tuning of the filter cavities is controlled by a measurement receiver
and a CPU unit.
and a CPU unit.
A small part of the output and reflected power is distributed by the
Measurement Coupler Unit (MCU) to four outputs. The signals are then
connected to the Measurement Receiver (MR). The MR used for
measuring can be the MR in the same CDU-F or the MR in another
CDU-F, depending on the configuration.
Measurement Coupler Unit (MCU) to four outputs. The signals are then
connected to the Measurement Receiver (MR). The MR used for
measuring can be the MR in the same CDU-F or the MR in another
CDU-F, depending on the configuration.
The MR measures the input signal to the filter combiners and also the
outgoing signal to the antenna. These two signals are used in the CPU
to control the stepper motors, one for each filter cavity. Moving parts in
the filter cavity, tune the combiner to the correct frequency.
outgoing signal to the antenna. These two signals are used in the CPU
to control the stepper motors, one for each filter cavity. Moving parts in
the filter cavity, tune the combiner to the correct frequency.
8.2
CDU Functions
Table 81
CDU Functions
Function
CDU-G
CDU-F
Filter Combiner
No
Yes
Hybrid Combiner
No
1)
No
Frequency Hopping
Baseband Hopping
Yes
Yes
Synthesizer Hopping
Yes
No
RF Filtering
Yes
Yes
RX preamplifier
Yes
Yes
Antenna system supervision and support
Yes
Yes
1)
Hybrid combiner is located outside the CDU.
132 (421)
EN/LZT 720 0008
R1A
2001-06-26
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