
Chapter 13 299
W-CDMA Digital Modulation for Component Test
W-CDMA Downlink Modulation
refers to the predefined configuration, not the number of channels in the user-modified
waveform.
During waveform generation, the WCDMA and I/Q annunciators appear and the waveform is
stored in volatile ARB memory. The waveform is now modulating the RF carrier.
For instructions on storing this user-defined W-CDMA state to the signal generator’s
non-volatile memory, see “Storing a W-CDMA Downlink/Uplink State” on page 299.
Applying Channel Modifications to an Active Waveform
To apply channel modifications to an active waveform (
W-CDMA Off On set to On), you must
press the
Apply Channel Setup softkey to force the updated waveform to generate. For example,
perform the following steps:
1. Press
W-CDMA Define > Edit Channel Setup.
2. Move the cursor to row 2.
3. Press
Delete Row > Return > Apply Channel Setup.
Notice that the waveform is regenerated to include the modification of the deleted row. Any
changes made in the Edit Channel Setup table editor while a waveform is active will not be
applied until the
Apply Channel Setup softkey is pressed.
Configuring the RF Output
1. Set the RF output frequency to 2.17 GHz.
2. Set the output amplitude to
−10 dBm.
3. Press
RF On/Off until On is highlighted.
The custom W-CDMA downlink signal is now available at the signal generator’s RF OUTPUT
connector.
Storing a W-CDMA Downlink/Uplink State
This procedure teaches you how to store a user-defined W-CDMA state. If you have not
created a W-CDMA state, complete the steps in the previous section, “Creating a User-Defined
W-CDMA Downlink State” on page 295.
1. Press
Mode Setup to return to the top-level W-CDMA menu, where W-CDMA Off On is the
first softkey.
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