ABB Switzerland Ltd 1KHW001489-EN ETL600
Us +38V to 45V
X107
X110
+
-
42V to 58V
X184
0 ... 2 dBu
24 - 500kHz
150 Ohm
Imax BIAS
+26V
VFB
CFB
SUPER-
VISION
Us
Z2
Z10
Z8
B/D/Z30
B/D/Z32
X182
nom. 50W
20 Ohm
RF-RELAY
TX-ALARM
Us
3
4
1
2
TXRF12-A
TXRF12-B
TXRF34-A
TXRF34-B
B2
AA
B/D/Z28
B/D/Z26
PAMPOUT-A
PAMPOUT-B
ZFFILT-IN
ZFFILT-GND
B/D/Z16
B/D/Z14
HYB-IN
GND
X165
TXFIL-OUT
DD
X168
X174
X171
X176
X177
X178
HYB-IN
GND
TXFIL-OUT
RF LINE
X175
B/D/Z20
X179
X180
X181
TXRF40W
TXRF80W
GND
B/D/Z24
B/D/Z22
BBCLCH
Tx Alarm
Level adj.
Tx
Alarm
to X183
FFEE
Fig. 3-18 P1LA Block Diagram
3.3.9. Transmit filter E5TX
The functions of the Tx filter are:
• It reduces spurious emissions due to non-linearity of the power
amplifier.
• Its high impedance outside the transmit band enables further PLC
units to be connected in parallel.
• It protects the output amplifier from the voltage spikes on the
power line caused by power system switching, faults and lightning.
The filter can be programmed for the three bandwidths 8, 16 and
32 kHz. Center frequency and bandwidth of the filter can be selected
with jumpers. Exact tuning of its coils L1 and L2 can be done using the
Tx tuning adapter P3LL and the HMI600 program. Refer to the E5TX
Tuning Instructions in the annex for details.
When the RF hybrid P3LE is configured accordingly, the Tx filter also
filters the Rx-RF signal. This is described in section 3.3.11.
3-30 November 2005 Structure and Function
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