Transmitter (Tx) - Nokia n81 Service Manual

RM-179; RM-223
System Module and User Interface

Transmitter (TX)

The digital baseband signal (eg. from the microphone) is converted to an analogue signal, which is then
amplified and transmitted from the antenna. The frequency of this signal can be tuned to match the
bandwidth of the system in use (eg. GSM900).
The transmitter functions are implemented in the RF ASIC.
Even though the GSM and WCDMA signals pass different components, the principles of the transmission is the
same.
Issue 1 COMPANY CONFIDENTIAL Page 6 –43
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