R&S FSL Measurements on Modulated Signals
1300.2519.12 2.31 E-11
3. Switch on the ACP measurement for W–CDMA.
Press the MEAS key.
Press the CP, ACP, MC–ACP softkey.
Press the CP / ACP Standard softkey.
In the standards list, mark W–CDMA 3GPP REV using the rotary knob or the arrow keys and
confirm pressing the rotary knob or the ENTER key.
The R&S FSL sets the channel configuration to the 3GPP W–CDMA standard for mobiles with
two adjacent channels above and below the transmit channel. The frequency span, the
resolution and video bandwidth and the detector are automatically set to the correct values. The
spectrum is displayed in the upper part of the screen and the channel power, the level ratios of
the adjacent channel powers and the channel configuration in the lower part of the screen. The
individual channels are displayed as vertical lines on the graph.
4. Set the optimum reference level and the RF attenuation for the applied signal level.
Press the Adjust Ref Level softkey.
The R&S FSL sets the optimum RF attenuation and the reference level for the power in the
transmission channel to obtain the maximum dynamic range. The following figure shows the
result of the measurement.
Fig. 2-24 Measuring the relative adjacent channel power on a W–CDMA uplink signal
5. Measuring adjacent channel power with the fast ACP mode.
Set Fast ACP softkey to On.
Press the Adjust Ref Level softkey.
The R&S FSL measures the power of the individual channels with zero span. A root raised
cosine filter with the parameters = 0.22 and chip rate 3.84 Mcps (= receive filter for 3GPP W–
CDMA) is used as channel filter.
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