Kathrein 9986492 User Manual

 

78

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.