How to measure I-Only or Q-only CW signal with RFmx

Updated Nov 8, 2022

Environment

Hardware

  • PXIe-5820

Software

  • RFmx
  • RFmx Waveform Creator 

1. When you use RFmx Waveform Creator to generate Tone waveform, you will see the parameter Apply to Channels. When you select I-only or Q only, how to check the corresponding signal in RFmx?



Tone setting in WFC.jpg

1. Use RFmx Waveform Creator to generate 1MHz Tone waveform and send it out
I Only signal by RFmx WFC.jpg

2. Use RFmx SpecAn to receive the signal, and see the result received under the default settings as follows
5820 DEFAULT SpecAn result.jpg

It can be seen that the measurement result is that two Tones exist, this is because the default mode is I&Q mode

3. Open the settings panel and select I only mode
I only mode setting panel.jpg
 

When changing as I Only mode, the measurement results can be seen as follows
I only data in spectrum.jpg


Verify that the I Only data is correct, you can switch to Q Only mode to see if there is data
Q only no data for I only signal in RFmx Spectrum.jpg
 

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