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How do I configure carrier spacing on the AD9361

Question asked by charleswr on Jul 30, 2018
Latest reply on Aug 1, 2018 by travisfcollins

I am trying to generate an OFDM waveform with the AD9361 on a ZC706 running Linux.  When I look at the signal coming out of the TX antenna, the carrier spacing is about 3-4x wider than it should be.

 

Is there a way to adjust the spacing of the carrier signal in the TX path? Is there something else it could be? The RX path looks completely valid and I am able to successfully decode signals provided by other source.

 

I am fairly confident that I am sending the correct IQ samples to the board. When I plot the samples in an application such as MATLAB, they produce a valid waveform.

 

On the attached image, the yellow line shows the waveform I am expecting, while the blue line is what is being generated by the 9361.

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