Transmitter; Introduction To Transmitter Troubleshooting - Nokia RM-51 Service Manual

RM-51
RF troubleshooting
i Check Save to Phone
ii Press Tune
iii Press Stop to store the data to the phone
Results
RX channel select filter calibration is finished.

Transmitter

Introduction to transmitter troubleshooting

A simple block diagram of the TX part of the phone is shown in the following figure. The voice or data signals
to be transmitted come from the UEMEK IC in the BB (baseband) area, and go to the Helgo IC, where they are
up-converted to RF. The TX signals going from UEMEK to Helgo are called the IQ-signals, and consist of two
balanced signals {TXIN, TXIP} and {TXQN, TXQP}, i.e. a total of four signal lines. In addition to the IQ signals, there
are also control signals going between BB and RF.
9238460 (Issue 1)
Figure 134 RX Channel Select Filter Calibration
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