FOM Softkey1

Softkey	Function
Normal	Sets the basic frequency as frequency data
RF+LO	Sets IF frequency (RF+LO) as frequency data
RF-LO	Sets IF frequency (RF-LO) as frequency data
LO-RF	Sets IF frequency (LO-RF) as frequency data
Base	Sets the basic frequency as frequency data
Stimulus	Sets the stimulus port frequency as frequency data
Response	Sets the response port frequency as frequency data

When Frequency Offset is OFF, and LO Frequency is ON (mixer measurement by vector-mixer calibration), Normal, RF+LO, RF-LO and LO-RF are enabled. When Frequency Offset is ON, Base, Stimulus and Response are enabled. You can change the frequency data for each trace.
If you use the LO-RF setting, you can display information in the same way as with the mixer measurement function of the Keysight PNA series by changing the measurement data according to the steps below.

Press Channel Next/Channel Prev keys and Trace Next/Trace prev keys to activate the trace for which you want to change the measurement data.
Press Sweep Setup key, then click Frequency Offset to display the Frequency Offset Menu.
Use the X-Axis key to change the frequency data.
Use the LO-RF key to change the frequency data to IF frequency.
Convert the measurement data to a complex conjugate number.
Press Analysis key, then click Conversion to display the Conversion Menu.
Click Function to select Conjugation.
Click Conversion to turn it ON.