3GPP Base Station Measurements (Option K72) R&S FSL
1300.2519.12 2.110 E-11
Measuring the Spectrum Emission Mask
The 3GPP specification defines a measurement that monitors compliance with a spectral mask in a
range of at least ±12.5 MHz around the WCDMA carrier. To assess the power emissions in the
specified range, the signal power is measured in the range near the carrier by means of a 30 kHz filter,
and in the ranges far away from the carrier by means of a 1 MHz filter. The resulting trace is compared
to a limit line defined in the 3GPP specification.
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 (e.g. R&S SMU):
Frequency: 2.1175 GHz
Level: 0 dBm
Standard: WCDMA/3GPP
Test model: 1, 32 DPCH channels
Procedure:
1. Set the R&S FSL to its default state.
Press the PRESET key.
The R&S FSL is set to its default state.
2. Change into the 3G FDD BTS mode.
Press the MODE key and activate the 3G FDD BTS option.
3. Set the center frequency to 2.1175 GHz.
Press the FREQ key.
The frequency menu is displayed.
In the dialog box, enter 2.1175 using the numeric keypad and confirm with the GHz key.
4. Set the reference level to 0 dBm.
Press the AMPT key and enter 0 dBm.
5. Start the Spectrum Emission Mask measurement.
Press the MEAS key.
Press the Spectrum Emission Mask softkey.
The spectrum of the 3GPP FDD signal is displayed.
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