616 Chapter 17
W-CDMA Downlink Digital Modulation for Receiver Test
Setting Up for a Compressed Mode Signal
7. Set the duration of the second transmission gap pattern which is expressed as a number of frames.
a. Move the cursor to highlight the TGPL2 field.
b. Press
4 > Enter.
8. Enable the compressed frames.
a. Move the cursor to highlight the TGPS field.
b. Press
Edit Item > Active.
9. Press the
Compressed Mode Off On softkey to On.
This softkey turns the compressed mode feature on, but it does not cause the compressed frame
transmission to begin. Compressed frames are not transmitted until the ESG receives a trigger signal.
This is demonstrated in the task, “Setting the Frame Power Offset and Triggering the Compressed Frame
Function” on page 618.
Notice that when compressed mode is turned on, the ALC feature of the ESG is turned off. This is
indicated by the ALC OFF annunciator showing in the display and shown in Figure 17-27.
The
Compressed Mode Off On softkey can be set to On at any time, however doing it at the end applies the
changes to the baseband signal, so you do not have to press the
Apply Channel Setup softkey. This just decreases the number of required key presses during the signal
setup. But if changes are made to the compressed mode after the feature is turned on, the Apply
Needed annunciator may appear. When the annunciator appears, this means that you must press the
Apply Channel Setup softkey to apply the changes to the signal.
Figure 17-27 shows the compressed mode display once all parameters from this procedure are
completed.
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