User's Manual

Digital ATSC Exciter-Modulator System Chapter 2,
Installation and Operating Instructions
Axcera Axciter, Rev. 0 27
DTVision Constellation Screen
I & Q Constellation Display
This display is created by plotting the 8-VSB in-phase (I) component against
the quadrature (Q) component. When the samples are taken at the symbol
time, then the data points will be precisely aligned along the eight vertical
lines. Those eight vertical lines are the eight VSB data levels.