R&S FSL CDMA2000 Base Station Measurements (Option K82)
1300.2519.12 2.123 E-11
Close the Settings Overview box.
In the two screens, the following results are displayed: by default, screen A shows the code domain
power of the signal. Compared to the measurement without an external trigger (see previous example),
the repetition rate of the measurement increases. In screen B the result summary is displayed. In the
row Trigger to Frame, the offset between the trigger event and and the start of the PCG (Power Control
Group) is shown.
Fig. 2-85: Measurement of the code domain power with an external trigger source
Note that the Trigger to Frame parameter is only visible in the full screen mode of the Result Summary
display.
7. Change into full screen mode..
Set the focus on screen B by pressing the Screen Focus A/B softkey.
Press the Screen Size Split/Full softkey.
The display is now in full screen mode
Adjusting the trigger offset
The delay between the trigger event and the start of the PCG can be compensated for by adjusting the
trigger offset.
8. Set an external trigger source and the trigger offset.
In the Settings Overview dialog box select the IQ Capture button.
Set the Trigger Source radio button to External.
Set the Trigger Offset to 100Rs to compensate analog delays of the trigger event.
In the two screens, the following results are displayed: Screen A shows the the same as above. In
screen B the result summary is displayed. In the Trg to Frame result, the offset between the trigger
event and the start of the PCG has been adjusted.
Behaviour with the wrong PN offset
The last adjustment to be made is setting the PN (Pseudo Noise) offset correctly. The measurement
can only be valid, if the PN offset on the analyzer is the same as that of the transmit signal.
To Next Page
Loading...
