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Uncalibrated S21 & S12 different... Analyzer problem?

Question asked by analyzer100 on Apr 1, 2014
Latest reply on Apr 5, 2014 by analyzer100
If I connect a short (10") good quality cable to the front of the analyzer between port 1 and port 2, and compare S12 with S21, my understanding is that the uncalibrated traces should be almost identical, is this correct?

We are seeing a difference of around 0.7db, and I suspect an Analyzer problem.  

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