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Making Measurements
Measurements
In the Agilent 8922, Output RF Spectrum measurements are made using a 3-pole
synchronously tuned measurement filter. The measurement results will differ from
measurements using a 5-pole filter.
The difference between measurements of the “ideal” signals using a 3-pole filter and
a 5-pole filter are shown in Table 1 and Table 2. These values are added to the GSM
specifications to obtain equivalent limits for Output RF Spectrum measurements
using 3-pole synchronously tuned measurement filter. The adjusted Output RF
Spectrum limits are based on a 3-pole filter are shown in Table 3 and Table 4.
NOTE It is important to note that these values are estimates based on simulation and
measurements. They are intended to allow the user to estimate their transmitters
conformance to GSM Output RF Spectrum requirements.
Table 1 3-Pole Specification Difference Output RF Spectrum due to Modulation
Offset from Carrier (kHZ)
100 200 250 400 600 to
1800
Difference (dB) 0 2.5 1.0 9.0 0
Table 2 3-Pole Specification Difference Output RF Spectrum due to Switching
Offset from Carrier (kHZ)
400 600 1200 1800
Difference (dB) 6420