Keysight M9421A - Stream Number; Spur Avoidance

3 WLAN Mode
3.7 WLAN MIMO Modulation Analysis Measurement
802.11n/ac/ax/be signal formats regardless of the number of streams, input
channels, or HT-LTF/VHT-LTF/HE-LTF/EHT-LTF symbols.
This method will be used in the case that you have fewer measurement channels
than transmit channels from your 802.11n/ac/ax/be transmitter, and your
transmitter is transmitting a Direct Map signal, you can partially demodulate the
signal by connecting your available measurement channels to some of the transmit
channels. This is because each transmitter of a Direct Map signal is essentially
independent of the other transmitters.
Remote
Command
[:SENSe]:EVMMimo:STReam:SELection AUTO | MANual | SIG
[:SENSe]:EVMMimo:STReam:SELection?
Example
:EVMM:STR:SEL SIG
:EVMM:STR:SEL?
Preset SIG
State Saved Saved in instrument state
Range Auto | Man | From SIG
Stream Number
Stream Number specifies how many spatial streams 802.11n/ac/ax/be signal
contains when Stream Selection is Manual.
Remote Command
[:SENSe]:EVMMimo:STReam[:NUMBer] <integer>
[:SENSe]:EVMMimo:STReam[:NUMBer]?
Example
:EVMM:STReam 1
:EVMM:STR?
Preset 1
State Saved Saved in instrument state
Min 1
Max 16
Spur Avoidance
Because the VXT models M9410A/11A/15A/16A 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.
1201 WLAN Mode User's &Programmer's Reference