Chapter 17 617
W-CDMA Downlink Digital Modulation for Receiver Test
Setting Up for a Compressed Mode Signal
Figure 17-27 Completed Compressed Mode Display
Performing a Manual Power Search
This task builds upon the previous task, “Setting the Compressed Mode Parameters” on page 615.
The ALC feature is disabled when compressed mode is used (
Compressed Mode Off On softkey set to On), and
it is recommended that a manual power search is performed to ensure the correct output power level. See the
section “Special Power Control Considerations When Using Compressed Mode” on page 638 for more
information.
This task will guide you in configuring and performing a manual power search. If desired, you can adjust the
power search settings to meet your individual test needs.
1. Press
Amplitude > Power Search > Power Search Reference Fixed Mod to Mod.
Mod references the power search on the rms value of the I/Q modulation, whereas fixed uses a 0.5 volt
reference during the power search operation.
From this current softkey menu, you can make adjustments to the other power search parameters to meet
your test needs.
2. Press
Return > Do Power Search.
The ESG has now performed a power adjustment for the current carrier frequency. If you change
frequencies or the RF output power level, the power adjustment will have to be done again.
3. Press the
Return hardkey to access the previous compressed mode menu.
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