User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
115User Manual 1178.3370.02 ─ 09
Figure 7-17: Falling edge of the GSM burst displayed with high time resolution
Measuring the Signal-to-Noise Ratio of Burst Signals
When TDMA transmission methods are used, the signal-to-noise ratio or the dynamic
range for deactivation can be measured by comparing the power values during the
activation phase and the deactivation phase of the transmission burst. Therefore, the
R&S FPL1000 provides a measurement for absolute and relative power in zero span.
In the following example, the measurement is performed using a GSM burst.
Signal-to-Noise Ratio of a GSM Signal
Figure 7-18: Test setup
Table 7-8: Signal generator settings (e.g. R&S SMW)
Frequency 890 MHz
Level 0 dBm
Modulation GSM, one time slot is switched on
1. Select [PRESET] to reset the instrument.
2. Set the center frequency to 890 MHz.
3. Set the frequency span to 0 Hz.
4. Set the resolution bandwidth to 1 MHz.
5. Set the reference level to 0 dBm (= level of the signal generator).
Measurements and Results