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E4407B 4dB Relative loss from 3 GHz to 26.5 GHz

Question asked by WizardRF on Dec 26, 2017
Latest reply on Jun 20, 2018 by WizardRF

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.