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PNA-X Phase Reference Cal with respect to changes in LO instead of RF

Question asked by rok on Jul 7, 2014
Latest reply on Jul 16, 2014 by Dr_joel

I have an engineer who wants to monitor the phase change in his upconverter based off the LO signal rather than the RF signal. Here is the setup:

Phase Shift power sweep SMC channel
RF power and frequency is fixed on Port 1. RF power is supplied from PNA-X internal primary source.
LO frequency is fixed; LO power is swept on Port 4. LO is supplied from PNA-X internal second source.

I believe the traditional phase shift comparison is from RF to IF. How do I perform the phase reference cal with comb filter generator differently and how do I setup the stimulus settings in order to properly view the phase shift effect of varying the LO power on the IF signal?