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measuring EVM in VSA

Question asked by ucl on Sep 4, 2019

hi

im trying to measure EVM of 100MHz modulated signal(16QAM) with 89600 VSA software.the problem is the EVM is not stable and changing from 2% to 14%. dose anyone have an idea why it dose not give me fixed EVM please?

 

 

 

regards

shirin

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