User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
274User Manual 1178.3370.02 ─ 03
2. Set the center frequency to 1950 MHz.
3. Select the "Channel Power ACLR" measurement function from the "Select Mea-
surement" dialog box.
4. Set the "W-CDMA 3GPP REV" standard for adjacent channel power measurement
in the "ACLR Setup" dialog box.
The R&S FPL1000 sets the channel configuration to the 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 automati-
cally set to the correct values. The spectrum is displayed in the upper window and
the channel power, the level ratios of the adjacent channel powers and the channel
configuration in the lower window. The individual channels are displayed as bars in
the graph.
5. Set the optimal reference level and RF attenuation for the applied signal level using
the "Auto Level" function.
The R&S FPL1000 sets the optimum RF attenuation and the reference level for the
power in the transmission channel to obtain the maximum dynamic range. The fol-
lowing figure shows the result of the measurement.
Figure 7-20: Measuring the relative adjacent channel power on a W-CDMA uplink signal
The R&S FPL1000 measures the power of the individual channels. A root raised
cosine filter with the parameters α = 0.22 and chip rate 3.84 Mcps (= receive filter
for W-CDMA) is used as channel filter.
Measurements and Results