Carrier Combiner P3Lg - ABB ETL600 Instruction Manual

ETL600
1
Amplifier
X2
Comb. / Hybr.
(impedance matching)
Fig. 3-19
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.
Tx
Rx
Fig. 3-20
Structure and Function
1KHW001489-EN
Cs1 ...Cs1
x y
3 X2
L
2
A B
Cp ...Cp
x y
2
X2
E5TX block diagram
+
P1LA
-
Tx-Filter
(upper HPA)
Combiner
(lower HPA)
Tx-Filter
+
P1LA
-
Rx-Filter
80 W RF front end with combiner
Cs2 ...Cs2
x y
X1 3 1
L
1
B A
Cp ...Cp
x y
2
X1
E5TX
P3LG
E5TX
P4RX
November 2005
ABB Switzerland Ltd
Comb. / Hybr.
X1
Power Line
(impedance matching)
RF
P3LE
Hybrid
3-31