R&S FSW Series - Page 200

Measurements and Results
R&S
®
FSW
200User Manual 1173.9411.02 ─ 43
Signal generator settings (e.g. R&S SMW):
Frequency: 850 MHz
Level: 0 dBm
Modulation: CDMA2000
Procedure:
1. Preset the R&S FSW.
2. Set the center frequency to 850 MHz.
3. Set the span to 4 MHz.
4. Set the reference level to +10 dBm.
5. Press the [MEAS] key or select "Select Measurement" in the "Overview".
6. Select the "Channel Power ACLR" measurement function.
7. Set the "CDMA2000" standard for adjacent channel power measurement in the
"ACLR Setup" dialog box.
The R&S FSW sets the channel configuration according to the 2000 standard with
two adjacent channels above and 2 below the transmit channel. The spectrum is
displayed in the upper part of the screen, the numeric values of the results and the
channel configuration in the lower part of the screen. The various channels are rep-
resented by vertical lines on the graph.
The frequency span, resolution bandwidth, video bandwidth and detector are
selected automatically to give correct results. To obtain stable results – especially
in the adjacent channels (30 kHz bandwidth) which are narrow in comparison with
the transmission channel bandwidth (1.23 MHz) – the RMS detector is used.
8. Set the optimal reference level and RF attenuation for the applied signal level using
the "Auto Level" function in the [Auto Set] menu.
The R&S FSW sets the optimal RF attenuation and the reference level based on
the transmission channel power to obtain the maximum dynamic range.
The Figure 7-35 shows the result of the measurement.
Channel Power and Adjacent-Channel Power (ACLR) Measurement