R&S FSL 3GPP Base Station Measurements (Option K72)
1300.2519.12 2.113 E-11
Behavior with deviating center frequency setting
In the following, the behavior of the DUT and the R&S FSL with an incorrect center frequency setting is
shown.
1. Tune the center frequency of the signal generator in 0.5 kHz steps.
2. Watch the R&S FSL screen.
A Code Domain Power measurement on the R&S FSL is still possible with a frequency error of up
to approx. 1 kHz. Up to 1 kHz, a frequency error causes no apparent difference in the accuracy of
the Code Domain Power measurement.
Above a frequency error of 1 kHz, the probability of impaired synchronization increases. With
continuous measurements, all channels are at times displayed in blue with almost the same level.
Above a frequency error of approx. 2 kHz, a Code Domain Power measurement cannot be
performed. The R&S FSL displays all possible codes in blue with a similar level.
3. Set the signal generator center frequency to 2.1175 GHz again.
Behavior with incorrect scrambling code
A correct Code Domain Power measurement can be carried out only if the scrambling code set on the
R&S FSL is identical to that of the transmitted signal.
1. Set the scrambling code of the signal generator to 0001.
With the scrambling code still set to 0 (default setting), the Code Domain Power Diagram result
display of the R&S FSL shows all possible codes with approximately the same level.
2. Set the correct scrambling code on the R&S FSL.
Press the MENU key.
Press the Scrambling Code softkey.
In the submenu, press the Scrambling Code softkey and enter 1 using the numeric keypad.
The Code Domain Power display again shows the test model.
Measuring the Relative Code Domain Power Triggered
If the code domain power measurement is performed without external triggering, a section of
approximately 20 ms of the test signal is recorded at an arbitrary moment to detect the start of a 3GPP
FDD frame in this section. Depending on the position of the frame start, the required computing time
can be quite long. Applying an external (frame) trigger can reduce the computing time.
Test setup:
Connect the RF output of the signal generator to the input of the R&S FSL.
Connect the reference input (EXT REF) on the rear panel of the R&S FSL to the reference input of
the signal generator (coaxial cable with BNC connectors).
Connect the external trigger input on the rear panel of the R&S FSL (EXT TRIGGER/GATE IN) to
the external trigger output of the signal generator.
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