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Measuring Coax Cable Phase

Question asked by srctec5094 on Nov 6, 2012
Latest reply on Nov 7, 2012 by srctec5094
I'm using an E5071B ENA Series Network Analyzer to measure the S21 Phase of a 7" coax cable.  The coax's velocity of propagation is 69.5% .  I want to measure the phase at 1.3GHz.

The analyzer is setup wtih a span from 1.2GHz to 1.4GHz, 1601 points.  I performed a calibration to the end of the test cables, then added adapters to each cable and performed a port extentions correction.

Using the analyzer in Expand Phase mode, and with the DUT connected, I get a measured phase value of approximately -39 degrees.  I get the same value in the standard Phase mode.  In the Positive Phase format, I get a reading of about 321 degrees.

I get the identical results using either a discrete calibration standards and an e-cal module.

Any ideas on why I am not seeing the expected 400 degrees of delay?  

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