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My E4407B is giving 4 dB relative loss from 3 GHz to 26.5 GHz compared to 50 MHz. It appears that the loss of the RYTHM mixer A8A6 assembly has increased from 12dB to 16 dB. Why is this? Is a schematic available? Are the mixer diodes failing? Others on the web have the same issue.

Hi everybody,   I am monitoring the Wifi signal using WLAN 802.11a/b/g/j/p application. There are several wifi AP in the area that I have put the signal analyzer. 89600 VSA software is also installed and everything works fine and I can see the demodulated signal (IQ constellation) and spectrum.    Now my question is that, how can