Ericsson RBS 2106 Reference Manual page 163

9.1.2 CDU-F
Figure 91
CDU-F has four filter cavities grouped internally two and two. The two
filters form a combiner for two TX signals and can be combined with a
CNU to a combiner for four signals, or connected to another CDU to
form a combining network for six signals.
The combined signals are fed through a lowpass TX filter to a duplex
filter. The duplex filter allows the use of a single antenna both for
transmitting and receiving. The duplex filter is connected directly to the
antenna connector on top of the CDU. The duplex filter also filters the
RX signal arriving to the same antenna. This filtered RX signal is
amplified in a two-stage low noise amplifier and then filtered in a
lowpass filter.
CDU-F also has an extra RX chain for diversity. This extra RX chain is
similar to the duplex RX chain.
All necessary connections for the TX combining network are done on
the front of the CDU with a Combining Network Unit (CNU).
EN/LZT 720 0008 P2A
2001-11-28
C D U -F
CDU-F
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Unit Decription, CDU-G and CDU-F
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