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Noise in VSWR with multiport test set connected to VNA

Question asked by yjames_1 on Nov 17, 2008
Latest reply on Dec 1, 2008 by yjames_1

The test environment i have is 8753ES VNA and a multiport test set HP87050A option 04 which is a four port switch box.

When i tried to measure the VSWR of the DUT with the configuration, the result curve looked not as flat as the one when no switch connected. I've already increased the source power to 8.5dBm and decrease the IFBW to 1000Hz but it seems the problem's still there.

I've attached the screenshots in attached file with calibration and measured result in both switch connected and not connected conditions.

Should i apply port extension in this case and how? anyone can give me a hand on this?