3 WLAN Mode
3.6 Modulation Analysis Measurement
Spur Avoidance
Because the VXT models M9410A/11A/15A/16A and M9410E/11E/15E/16E are
direct-conversion (zero-IF) receivers, feedthrough leakage from the local oscillator
appears as a spurious signal (spur) at the center frequency. The Spur Avoidance
function is provided to eliminate this spur, at the expense of some measurement
speed.
When Spur Avoidance is enabled (the default), the analyzer uses a software
algorithm to remove this spur from the displayed measurement data, but the
algorithm only operates under certain conditions. Specifically, it only operates when
the BW<= maxBW/2.5.
You can disable this function in order to speed up your measurement. When Spur
Avoidance is turned Off, a warning message will appear in the status bar as
“Settings Alert; Spur Avoidance Off”. This is to alert you that measurement accuracy
might be impacted because you have defeated the spur avoidance algorithm.
The spur avoidance function is not available for:
•M9410A/11A with EP6 option at frequency above 6 GHz
•M9415A/16A at frequency below 380 MHz and above 12.3 GHz
•M9410E/11E/15E/16E at frequency below 380 MHz and above 25.9 GHz
Remote Command
[:SENSe]:EVM:SAVoid[:STATe] ON | OFF | 0 | 1
[:SENSe]:EVM:SAVoid[:STATe]?
Example
:EVM:SAVoid ON
:EVM:SAVoid?
Dependencies This control only appears in VXT models M9410A/11A/15A/16A and M9410E/11E/15E/16E
Preset
ON
State Saved Saved in instrument state
Range On|Off
More Information
Maximum digital IF BW is limited by both Option and Center frequency.
For VXT models M9410A/11A:
Bandwidth Option limitation:
Option Max Digital IF BW
B40 40 MHz
B3X 300 MHz
973 WLAN Mode User's &Programmer's Reference
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