638 Chapter 17
W-CDMA Downlink Digital Modulation for Receiver Test
W-CDMA Downlink Concepts
Special Power Control Considerations When Using Compressed Mode
When using the compressed mode, more than a single power level is required. In addition to the rapidly
varying power levels for the DPCH, there are also periods of discontinuous transmission (gaps where no RF
is transmitted). This is why the signal generator turns off the ALC when the compressed mode is turned on.
Because the ALC is turned off, the output power level may not be consistent with the power level entered on
the ESG, so a manual power search must be performed in order to ensure the correct output power level.
Pressing the
Do Power Search softkey executes the manual power search function. This is demonstrated in the
task “Performing a Manual Power Search” on page 617.
Temperature changes or changes to certain signal generator settings may cause the output power level to
change over time. It is recommended that you perform a manual power search at least every hour to maintain
the correct output power level.
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