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Strange behaving on thru measurements with 8722ES

Question asked by bar28 on Feb 22, 2016
Latest reply on Jun 16, 2016 by bar28

I done full 2-port calibration from 50MHz to 18GHz with my 8722ES (test port power default -10dBm, IF 10Hz). Used calkit was 85054D and both testport were used tesport cables.
After measurmement calibration Thru looks very good. When I'm measuring 85055A Type-N verification kit 20dB attenuator and 50ohm airline
strange peaks appers on thru on same places on traces. Biggest one on 13.6GHz. How such a peaks can come, because none strange can
see on Thru measurement after calibration? I even repleaced all testport cables and adapters to another ones, but no effect at all.