Load IQ file/Generate modulated signal from 5646R SG by C++ command

[neogsj]

Hello,

I am trying to generate some modulated signal from the PXI5646R SG by using C++ code.

In order to have modulated signal, a IQ file (txt or tdms) should be loaded first. I would like to know what command I should use to load the IQ files in C++. Or is there any specific way that generates the modulated signal?

I checked the niRFSG.h, can not really find a command that works.

Thank you,

Neo

[Jupiter02]

Hi Neo,

Have you looked into the niRFSG_WriteArbWaveform function? This function takes I and Q data as parameters and will write the waveform to the NI-RFSG device. 

If your IQ file is in the TDMS format, the links below may be helpful in determining how to read this file to extract the I and Q data to be used with this function.

How Do I Read or Write to a TDMS File Using Third Party Software?

The NI TDMS File Format

[neogsj]

Hello, Julia,

We tried to read the TDMS file by following an example in NI(The NI TDMS File Format). It does not work, always retruns "unexpected error".

We found a command to upload the IQ file in SG and generate the modulated signal. 

It requires to install NI-RFSG Playback Library.

Best regards,

Ne0