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Examples for QAM constellation diagram
The following examples show possible errors and their representation in the constellation diagram.
64 QAM signal without faults 64 QAM signal with intermodulation of narrow
band noise
64 QAM signal with low broadband noise. 64 QAM signal with strong broadband
Possible cause: Bad amplifier or to small of noise. Possible cause: cable loss is to high
input level on an amplifier in the or amplifier has a defect.
transmission line.
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