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QPSK measurements

Question asked by geoan on Jun 12, 2014
Latest reply on Jun 20, 2014 by tabbott
Hi everyone.
I am facing the following problem.

I create a QPSK baseband signal by Matlab (QPSK.m) then load into Tektronix AWG7000 to creating waveform. Followed by connecting output of AWG by Agilent Oscilloscope DSA 96204. 
The oscilloscope is displayed the waveform signal and spectrum as given in Fig Osco1.

But when I connect the oscilloscope with 89600 VSA, the VSA doesn't detect the spectrum and I can't demodulate my QPSK signal (See picture VSA1).

Does anyone can help me figure out this trouble?