Huawei U8185 Maintenance Manual page 45

U8185
Maintenance Manual
Figure 9-9 Transmitting circuit
The main antenna receives and transmits RF signals. The duplexer separates the receiving and
transmitting signals. The receiving signals are received from the ANT end of the duplexer and
transmitted out from the Rx end; the transmitting signals are received from the Tx end and
transmitted from the ANT end to the duplexer and then sent out through the antenna. The
duplexer's Rx and Tx ends are isolated, preventing transmission signals from interfering to
receiving signals and thereby affecting antenna sensitivity.
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Issue 1.0 (2012-03-23)
Receiving circuit
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9 Principles and Failure Analysis
40