User`s guide

332 Chapter 14
W-CDMA Downlink Digital Modulation for Receiver Test
Using W-CDMA Downlink
Adjusting Code Domain Power
The tasks in this procedure build upon the previous procedure. This procedure teaches you
how to perform the following tasks:
• “Scaling to 0 dB” on page 332
• “Setting Equal Channel Powers” on page 333
Scaling to 0 dB
After changing the relative power level for a channel, the ESG automatically scales the total
power to 0 dB, while preserving the relative channel power levels. Although the displayed
total power changes in value as channel powers are adjusted, the actual total power is
maintained at 0 dB. The displayed channel power levels remain unchanged, reflecting only
user-assigned values, so the user can complete the relative power adjustments. This task
teaches you how to update the display to show the normalized relative channel power for each
channel after completing the setup.
1. Press
Mode Setup to return to the top-level real-time W-CDMA menu.
2. Press
Link Control > Adjust Code Domain Power > Scale to 0 dB.
The power level displayed for each channel is now changed to show the normalized relative
channel power. The values shown in Figure 14-4 result from activating the OCNS channel, as
described earlier in this section. Notice the displayed power levels before and after the
Scale to
0 dB
softkey is pressed.
Figure 14-4 Scaling to Zero dB
Displayed Power Levels
After Scaling to 0 dB
Displayed Power Levels
Before Scaling to 0 dB