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VSWR test on NA

Question asked by hti1106 on Nov 10, 2006
Latest reply on Nov 11, 2006 by Dr_joel
Tested VSWR on antenna.  The test results on two different test conditions are totally different.  Here is the situation.

1) Conducted single port calibration on the N-SMA adaptor and tested VSWR for an antenna sample.
2) Conducted single port calibration at the end of 1 foot cable connected to the port through SMA-N adaptor.  Test again for the same antenna.  The VSWR data is totally different.

WHY?  Can somebody shed some lights on this?  Thanks a lot.