526 Chapter 16
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up Compressed Mode for a Single TGPS Transmission
7. Trigger the spectrum analyzer from the rear panel input using the supplied ESG trigger signal.
Press
Trig Source > Ext Rear.
8. Zoom in on the RF Envelope display
Press
Zoom.
You can now see the compressed signal moving across the PSA display.
To remove any text showing on the display, press the
ESC hardkey.
Adjusting the Number of Gap Patterns
This task builds upon the procedure “Configuring Compressed Mode” on page 521.
This task will set up the ESG so that the transmitted gap patterns have a finite repetition. This will enable
you to have a clearer view of how the compressed signal parameters affect the transmission.
1. Enter the number of transmitted gap patterns.
a. Highlight the TGPRC field.
b. Press
5 > Enter.
2. Press
Apply Channel Setup > Compressed Mode Start Trigger.
The Comp Trg annunciator comes on and then goes off after 5 gap pattern transmissions. This indicates
that the compressed mode trigger is no longer active and the ESG has quit transmitting compressed
frames.
Notice that the frame pattern is now easily viewed on the PSA display and is shown in Figure 16-53. This
figure also points out some of the compressed mode parameters as they appear on the signal.
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