Reference Manual

Unit Decription, CDU-G and CDU-F
CPU
MR
CDU bus
DC in
Prin1 Prin2
TX2-2
TX2-1
TX1-2
TX1-1
Prin1 Prin2
CNU
FC
TXLP
TXBP-DPX
MCU
RXBP-DPX
RXBP
TX/RX
RX
Pr1out
Pr2out
Pr1out
Pr2out
DC
CXU
RX2
RX1
TXin
LNA
Power supply supervision
P007451A
TX2-1+TX2-2
TX1-1+TX1-2
Figure 92 Block diagram of CDU-F
The tuning of the filter cavities is controlled by a measurement receiver
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.
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.
9.2 CDU Functions
Table 94 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.
162 (485)
EN/LZT 720 0008 P2A
2001-11-28
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Preliminary