EZRadio and EZRadioPro devices have a low injection LO architecture that downconverts to a low IF (Intermediate Frequency). In other words the LO (Local Oscillator) is always one IF below the wanted receive frequency.
Knowing the IF frequency is essential for testing image rejection performance. The image frequency is located two times the IF below the wanted frequency.
On EZRadio devices the IF frequency invariable equals to f_XO/64.
On EZRadioPro devices above equation is still true in most of the cases. EZradioPro, however allows for IF scaling (albeit hidden under a license in WDS) so the best way to check what the IF frequency has been set to is looking at the configuration batch file.
The IF frequency is listed in the batch file right above the Rx filter bandwidth numbers.