Rohde & Schwarz R&S FSL3 - Measuring the Spectrum Emission Mask

CDMA2000 Base Station Measurements (Option K82) R&S FSL
1300.2519.12 2.118 E-11
Measuring the Spectrum Emission Mask
To detect spurious emissions such as harmonics or intermodulation products, the R&S FSL offers a
spectrum emission mask measurement. The measurement compares the power against the spurious
emissions mask in the range from -4 MHz to 4 MHz around the carrier. The exact measurement
settings like the filter that is used depend on the Band Class parameter (for supported Band Classes
see chapter 4 "Instrument Functions").
Test setup:
 Connect the RF output of the signal generator to the RF input of the R&S FSL (coaxial cable with N
connectors).
Signal generator settings:
Frequency: 878.49 MHz
Level: 0 dBm
Standard: CDMA2000
Procedure:
1. Set the R&S FSL to its default state.
 Press the PRESET key.
2. Activate the CDMA2000 BTS Analyzer mode.
 Press the MODE key and activate the CDMA2000 BTS Analyzer option.
3. Start the measurement.
 Press the MEAS key.
 Press the Spectrum Emission Mask softkey.
4. Set the center frequency.
 Press the FREQ key and enter 878.49 MHz.
5. Set the reference level.
 Press the AMPT key and enter 0 dBm.
6. Select a bandclass
 Press the Bandclass softkey and select BandClass 0: 800 MHz Cellular Band from the list.
On the screen, the spectrum of the signal is displayed, including the limit line defined in the standard.
To understand where and about how much the measurement has failed, the List Evaluation table shows
the frequencies, where spurious emissions occur (for details on the table structure see chapter 4
"Instrument Functions").