Why won't my Signal Analyzers Display Pulse Type Signals Properly?
GSM signals are pulsed. These signals may be missed if the Sweep Acquisition setting is on Auto. We recommend using a Sweep Acquisition setting of 50 or 100 for GSM signals. For more details, see "Sweep Acquisition" in the Spectrum Analyzer Mode section of the User's Guide.
Other pulsed signal formats that this may apply to: TD-SCDMA, WiMAX.