Alpha Technologies XP-EDH4 - Technical Manual - Manual (Page 63)

63 745-419-B0-001 Rev. A (11/2013)
Fig. 3-23, Sample QAM Constellation—Circular Smear (Phase Noise)
Fig. 3-24, Sample QAM Constellation—Corners Squeezed to Center (Gain Compression)
3.0 Configuration and Operation, continued
3.9.20 Interpreting QAM Constellation Data by Visual Inspection, continued