Alpha Technologies XP-EDH4 - Technical Manual - Manual (Page 64)

64 745-419-B0-001 Rev. A (11/2013)
Fig. 3-25, Sample QAM Constellation—Rectangular vs. Square (I-Q Imbalance)
Fig. 3-26, Sample QAM Constellation—Twisted or Skewed (Quadrature Distortion)
3.0 Configuration and Operation, continued
3.9.20 Interpreting QAM Constellation Data by Visual Inspection, continued