i used AD-FMCOMMS3-EBZ with IIO Oscilloscope.
a 188KHZ noise appears when i set RX & TX LO frequency to 1500MHZ
the left noise is 1500.062MHZ
the right noise is 1500.437MHZ
but this noise disappears when i set RX & TX LO frequency to 1501MHZ
where is the source of this noise?
how to remove this noise?