ETL600 1KHW001489-EN ABB Switzerland Ltd
AB
L
2
Cs1
x
...Cs1
y
Cp
x
...Cp
y
3
2
1
X2
X2
X2
Amplifier
Comb. / Hybr.
AB
L
1
Cs2
x
...Cs2
y
Cp
x
...Cp
y
3
2
1
X1
X1
X1
Comb. / Hybr.
Power Line
(impedance matching) (impedance matching)
Fig. 3-19 E5TX block diagram
3.3.10. Carrier combiner P3LG
The carrier combiner P3LG is used only in case of the 80 W terminal
ETL680. The purpose of the carrier combiner is to sum the power
outputs of the two 40 W amplifiers to give a 80 W PEP output (Fig.
3-20). It consists of a combiner transformer and transmitter alarm
circuit (Fig. 3-21). Jumpers on the board have to be inserted according
to the bandwidth of the Tx filter. The combiner is mounted in place of
the RF hybrid in the upper P7LA power rack as described in section
3.2.
E5TXTx
+
-
Rx
RF
P1LA
+
-
P1LA
E5TX
P3LG
(upper HPA)
(lower HPA)
P3LE
Hybrid
Combiner
Tx-Filter
Tx-Filter
P4RX
Rx-Filter
Fig. 3-20 80 W RF front end with combiner
Structure and Function November 2005 3-31
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