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OQPSK signal - E4437B and 89441A

Question asked by Tardz on Oct 27, 2017
Latest reply on May 17, 2018 by jcresp


   I would like to do a test with OQPSK signal, I used an E4437B (PN9 sequence, gaussian filter, alpha 0.5, OQPSK modulation type) and I used a 89441A to see constellation (see picture). Setup for demodulation is no filter for measurement and gaussian filter with alpha 0.5 for reference. Another try with RECTangular filter, there are more than four grouping of points ... what's wrong with my setup. I suppose that EVM measurement with 89441A is incorrect.