WILLTEK 4403 - SEM (Spectrum Emission Mask); Parameters

Chapter 3 WCDMA Non-Call Mode
RF Analyzer for spectrum
98 WCDMA Options Version 6.20
In this example the ACLR values are below the upper limit shown by the hori-
zontal line in the display. Accordingly, the test verdict reads “Passed“.
The softkey functions are explained in section “Softkeys of the RF Analyzer” on
page 102.
SEM (Spectrum Emission
Mask)
In the spectrum emission mask the signal spectrum outside the allocated channel
is measured. The resulting display is split into two parts. The measurement is
performed in a spacing between 2.5 and 3.5 MHz from the carrier frequency
using a resolution bandwidth of 30 kHz. Above 3.5 MHz up to 12.5 MHz from the
carrier a 1 MHz filter is used. The WCDMA specification gives upper limits
depending on the frequency. The limit values used for measurements are prepro-
grammed in full accordance with WCDMA specifications and marked red on the
4400 display. However, you can change the limit values in order to refine testing
requirements and verify adherence to even more stringent requirements. The
limits can be modified in the Spectrum SEM Parameters menu. For further details
on setting and modifying system parameters please refer to section “Spectrum
SEM” on page 80.
The following table shows the WCDMA spectrum emission mask requirements.
The aim of the spectrum emission measurement is to verify that the power of any
UE emission does not surpass the levels specified in this table.
Parameters Max Level — Selection field for the level at which the measurement is to be
performed. The fields drop-down list offers a value range from –20 dBm to
30 dBm.
Res BW — Selection field for the resolution bandwidth, i.e. the filter resolution,
to be used for measuring. In the field’s drop-down list you can choose between
15 and 30 kHz.
Span — Selection field for the span to be used for measuring. In the field’s drop-
down list you can choose between ±3 and ±5 MHz.
Table 13 Spectrum emission mask requirement
Δf in MHz Minimum
requirement for
Band I, II, III
Additional
requirement
for Band II
Measurement
bandwidth
2.5 to 3.5 See TS 134
v3.13.0
Release 99,
Chapter 5.9.5
–15 dBm 30 kHz
3.5 to 7.5 –13 dBm 1MHz
7.5 to 8.5 –13 dBm 1 MHz
8.5 to 12.5 –47.5 dBc –13 dBm 1MHz
NOTE
Δf is the separation between the carrier frequency and the center of the mea-
suring filter.