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VSWR test trouble

Question asked by hti1106 on Nov 10, 2006
Latest reply on Nov 11, 2006 by Dr_joel
Test VSWR on antenna under two different conditions.  The results are totally different.

1) Conducted single port calibration at the end of N-SMA adaptor.  Tested VSWR of an antenna.
2) Conducted single port calibration at the end of 1 foot cable connected through SMA-N adaptor.  Then tested VSWR for the same antenna sample.

The results are totally different!  WHY?!  Can some body shed some lights?  Thanks.  

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